Merge pull request #234 from aykhans/dependabot/go_modules/charm.land/bubbletea/v2-2.0.10

build(deps): bump charm.land/bubbletea/v2 from 2.0.9 to 2.0.10

.github/workflows/lint.yaml

@@ -13,10 +13,10 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
-      - uses: actions/setup-go@v6
+      - uses: actions/setup-go@v7
         with:
-          go-version: 1.26.2
+          go-version-file: go.mod
       - name: go fix
         run: |
           go fix ./...
@@ -24,4 +24,4 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v9
         with:
-          version: v2.11.4
+          version: v2.13.2

.github/workflows/nix.yaml

@@ -0,0 +1,172 @@
+name: nix
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    paths:
+      - "go.mod"
+      - "go.sum"
+      - "nix/**"
+      - "flake.nix"
+      - "flake.lock"
+  workflow_call:
+    inputs:
+      ref:
+        description: "Ref to check out. Defaults to the triggering ref."
+        type: string
+        required: false
+
+permissions:
+  contents: read
+
+concurrency:
+  group: nix-${{ github.event_name }}-${{ github.event.pull_request.number || github.ref }}
+  # Keyed on the PR author, which is stable across the fix-up push, so the run
+  # started by that push cannot cancel the run that made it.
+  cancel-in-progress: ${{ github.event_name == 'pull_request' && github.event.pull_request.user.login != 'dependabot[bot]' }}
+
+env:
+  SELF_HOSTED_PR: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository }}
+  IS_DEPENDABOT: ${{ github.actor == 'dependabot[bot]' }}
+
+jobs:
+  build:
+    name: build
+    runs-on: ubuntu-latest
+    permissions:
+      # The only write is git push, which authenticates with the PAT that
+      # checkout persists, not with GITHUB_TOKEN.
+      contents: read
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          # head.sha, not the merge ref: the hash is computed for the tree that
+          # gets pushed, and the run that verifies it must build that same tree.
+          ref: ${{ inputs.ref || github.event.pull_request.head.sha || github.ref }}
+          token: ${{ (env.IS_DEPENDABOT == 'true' && secrets.DEPENDABOT) || secrets.GITHUB_TOKEN }}
+
+      - uses: cachix/install-nix-action@v31
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: nix build
+        id: build
+        continue-on-error: ${{ env.SELF_HOSTED_PR == 'true' }}
+        run: nix build .#default --no-link --print-build-logs
+
+      - name: Recompute vendorHash
+        id: hash
+        if: steps.build.outcome == 'failure' && env.SELF_HOSTED_PR == 'true'
+        run: |
+          nix run nixpkgs#nix-update -- --flake --version=skip --no-src default
+
+          # An unchanged hash means the build broke for some other reason. Say
+          # nothing and let the job fail on the real error.
+          if git diff --quiet -- nix/package.nix; then
+            echo "stale=false" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+
+          echo "stale=true" >> "$GITHUB_OUTPUT"
+          sed -n 's/^[[:space:]]*vendorHash = "\([^"]*\)".*/hash=\1/p' nix/package.nix >> "$GITHUB_OUTPUT"
+
+      - name: Push vendorHash fix
+        if: steps.hash.outputs.stale == 'true' && env.IS_DEPENDABOT == 'true'
+        env:
+          HEAD_REF: ${{ github.head_ref }}
+          PUSH_TOKEN: ${{ secrets.DEPENDABOT }}
+        run: |
+          if [ -z "$PUSH_TOKEN" ]; then
+            echo "::error::the DEPENDABOT push token is missing from the Dependabot secret store"
+            exit 1
+          fi
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add nix/package.nix
+          git commit -m "fix(nix): update vendorHash [dependabot skip]"
+          git push origin "HEAD:refs/heads/$HEAD_REF"
+          echo "::notice::vendorHash updated and pushed; the run on the new commit decides this PR"
+
+      - name: Comment stale vendorHash
+        if: steps.hash.outputs.stale == 'true' && env.IS_DEPENDABOT != 'true'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR: ${{ github.event.pull_request.number }}
+          HASH: ${{ steps.hash.outputs.hash }}
+        run: |
+          marker='<!-- vendorhash-bot -->'
+          body=$(cat <<EOF
+          $marker
+          ### \`nix/package.nix\` vendorHash is stale
+
+          This branch changes the Go dependencies, so the vendor derivation no longer matches the pinned hash and \`nix build\` fails.
+
+          \`\`\`nix
+          vendorHash = "$HASH";
+          \`\`\`
+
+          Run \`task nix-hash\` locally and commit the result, or paste the hash above.
+          EOF
+          )
+
+          # Keep one sticky comment instead of a new one on every push. Without
+          # the explicit check a failed lookup reads as "no comment yet" and
+          # posts a duplicate; piping into head would hide the exit status.
+          if ! matches=$(gh api --paginate "repos/$GITHUB_REPOSITORY/issues/$PR/comments?per_page=100" \
+                           --jq ".[] | select(.user.login == \"github-actions[bot]\" and ((.body // \"\") | contains(\"$marker\"))) | .id"); then
+            echo "::error::could not list the pull request comments"
+            exit 1
+          fi
+          id=$(printf '%s\n' "$matches" | head -n 1)
+          if [ -n "$id" ]; then
+            gh api -X PATCH "repos/$GITHUB_REPOSITORY/issues/comments/$id" -f body="$body" >/dev/null
+          else
+            gh pr comment "$PR" --body "$body"
+          fi
+
+      # Once the hash is fixed the build passes and the step above stops running,
+      # so without this the comment keeps claiming the branch is broken under a
+      # green check.
+      - name: Resolve stale vendorHash comment
+        # Gated on the hash rather than the build: a later push can fix the hash
+        # while the build still fails for an unrelated reason, and the comment
+        # must stop blaming the vendor derivation either way. Skipped when the
+        # recompute itself errored, since then we do not know.
+        if: ${{ !cancelled() && env.SELF_HOSTED_PR == 'true' && steps.hash.outputs.stale != 'true' && steps.hash.outcome != 'failure' }}
+        continue-on-error: true
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR: ${{ github.event.pull_request.number }}
+          BUILD: ${{ steps.build.outcome }}
+        run: |
+          marker='<!-- vendorhash-bot -->'
+          if ! matches=$(gh api --paginate "repos/$GITHUB_REPOSITORY/issues/$PR/comments?per_page=100" \
+                           --jq ".[] | select(.user.login == \"github-actions[bot]\" and ((.body // \"\") | contains(\"$marker\"))) | .id"); then
+            echo "::error::could not list the pull request comments"
+            exit 1
+          fi
+          id=$(printf '%s\n' "$matches" | head -n 1)
+          [ -n "$id" ] || exit 0
+
+          if [ "$BUILD" = "success" ]; then
+            detail='`nix build` passes on this branch.'
+          else
+            detail='The build is failing for another reason; see the workflow log.'
+          fi
+          body=$(cat <<EOF
+          $marker
+          ### \`nix/package.nix\` vendorHash is up to date
+
+          $detail
+          EOF
+          )
+          gh api -X PATCH "repos/$GITHUB_REPOSITORY/issues/comments/$id" -f body="$body" >/dev/null
+
+      - name: Report build failure
+        if: ${{ !cancelled() && steps.build.outcome == 'failure' && !(env.IS_DEPENDABOT == 'true' && steps.hash.outputs.stale == 'true') }}
+        run: |
+          echo "::error file=nix/package.nix::nix build failed; see the log above"
+          exit 1

.github/workflows/release.yaml

@@ -2,50 +2,101 @@ name: Build and Release
 
 on:
   release:
-    types: [created]
+    types: [published]
-  workflow_dispatch:
-    inputs:
-      tag:
-        description: "Release tag (e.g., v1.0.0)"
-        required: true
-      build_binaries:
-        description: "Build and upload binaries"
-        type: boolean
-        default: true
-      build_docker:
-        description: "Build and push Docker image"
-        type: boolean
-        default: true
 
 permissions:
   contents: write
 
 jobs:
+  nix:
+    name: Verify Nix package
+    uses: ./.github/workflows/nix.yaml
+    permissions:
+      contents: read
+      pull-requests: write
+    with:
+      ref: ${{ github.ref }}
+
+  # Gate: the tag must come from main, agree with the pre-release flag, and match
+  # the hand-bumped version in nix/package.nix.
+  version:
+    name: Verify release
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    env:
+      TAG: ${{ github.ref_name }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v7
+        with:
+          ref: ${{ github.ref }}
+          # Full history so the tag can be located on main's first-parent line.
+          fetch-depth: 0
+
+      - name: Check the tag is on main
+        run: |
+          git fetch --no-tags origin "+refs/heads/main:refs/remotes/origin/main"
+          git rev-list --first-parent refs/remotes/origin/main > "$RUNNER_TEMP/first-parent.txt"
+          if ! grep -qxF "$GITHUB_SHA" "$RUNNER_TEMP/first-parent.txt"; then
+            echo "::error::$TAG ($GITHUB_SHA) is not on main; releases must be cut from main"
+            exit 1
+          fi
+
+      - name: Check the tag matches the pre-release flag
+        env:
+          PRERELEASE: ${{ github.event.release.prerelease }}
+        run: |
+          # The flag comes from the checkbox, not the tag name, so without this a
+          # tag like v1.5.0-rc1 published as stable would move :latest.
+          case "$TAG" in
+            *-*)
+              if [ "$PRERELEASE" != "true" ]; then
+                echo "::error::tag '$TAG' carries a pre-release suffix but the release is not marked as a pre-release"
+                exit 1
+              fi
+              ;;
+          esac
+
+      - name: Check nix/package.nix matches the release tag
+        run: |
+          expected="${TAG#v}"
+          expected="${expected%%-*}"
+          actual="$(sed -n 's/^[[:space:]]*version = "\([^"]*\)".*/\1/p' nix/package.nix | head -1)"
+          if [ -z "$actual" ]; then
+            echo "::error file=nix/package.nix::could not read the version string"
+            exit 1
+          fi
+          if [ "$actual" != "$expected" ]; then
+            echo "::error file=nix/package.nix::version is '$actual' but the release tag is '$TAG' (expected '$expected')"
+            exit 1
+          fi
+          echo "nix/package.nix version '$actual' matches tag '$TAG'"
+
   build:
     name: Build binaries
+    needs: [nix, version]
     runs-on: ubuntu-latest
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
-          ref: ${{ inputs.tag || github.ref }}
+          ref: ${{ github.ref }}
 
       - name: Set build metadata
         run: |
           echo "VERSION=$(git describe --tags --always)" >> $GITHUB_ENV
           echo "GIT_COMMIT=$(git rev-parse HEAD)" >> $GITHUB_ENV
-          echo "GO_VERSION=1.26.2" >> $GITHUB_ENV
+          echo "GO_VERSION=$(sed -n 's/^go //p' go.mod)" >> $GITHUB_ENV
 
       - name: Set up Go
-        if: github.event_name == 'release' || inputs.build_binaries
+        uses: actions/setup-go@v7
-        uses: actions/setup-go@v6
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
           cache: true
 
       - name: Build binaries
-        if: github.event_name == 'release' || inputs.build_binaries
         run: |
           LDFLAGS="-X 'go.aykhans.me/sarin/internal/version.Version=${{ env.VERSION }}' \
                    -X 'go.aykhans.me/sarin/internal/version.GitCommit=${{ env.GIT_COMMIT }}' \
@@ -55,36 +106,33 @@ jobs:
 
           CGO_ENABLED=0 GOOS=linux   GOARCH=amd64 go build -ldflags "$LDFLAGS" -o ./sarin-linux-amd64 ./cmd/cli/main.go
           CGO_ENABLED=0 GOOS=linux   GOARCH=arm64 go build -ldflags "$LDFLAGS" -o ./sarin-linux-arm64 ./cmd/cli/main.go
+          CGO_ENABLED=0 GOOS=freebsd GOARCH=amd64 go build -ldflags "$LDFLAGS" -o ./sarin-freebsd-amd64 ./cmd/cli/main.go
+          CGO_ENABLED=0 GOOS=freebsd GOARCH=arm64 go build -ldflags "$LDFLAGS" -o ./sarin-freebsd-arm64 ./cmd/cli/main.go
           CGO_ENABLED=0 GOOS=darwin  GOARCH=amd64 go build -ldflags "$LDFLAGS" -o ./sarin-darwin-amd64 ./cmd/cli/main.go
           CGO_ENABLED=0 GOOS=darwin  GOARCH=arm64 go build -ldflags "$LDFLAGS" -o ./sarin-darwin-arm64 ./cmd/cli/main.go
           CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags "$LDFLAGS" -o ./sarin-windows-amd64.exe ./cmd/cli/main.go
           CGO_ENABLED=0 GOOS=windows GOARCH=arm64 go build -ldflags "$LDFLAGS" -o ./sarin-windows-arm64.exe ./cmd/cli/main.go
 
       - name: Upload Release Assets
-        if: github.event_name == 'release' || inputs.build_binaries
+        uses: softprops/action-gh-release@v3
-        uses: softprops/action-gh-release@v2
         with:
-          tag_name: ${{ inputs.tag || github.ref_name }}
+          tag_name: ${{ github.ref_name }}
           files: ./sarin-*
 
       - name: Set up QEMU
-        if: github.event_name == 'release' || inputs.build_docker
+        uses: docker/setup-qemu-action@v4
-        uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
-        if: github.event_name == 'release' || inputs.build_docker
+        uses: docker/setup-buildx-action@v4
-        uses: docker/setup-buildx-action@v3
 
       - name: Login to Docker Hub
-        if: github.event_name == 'release' || inputs.build_docker
+        uses: docker/login-action@v4
-        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push Docker image
-        if: github.event_name == 'release' || inputs.build_docker
+        uses: docker/build-push-action@v7
-        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64
@@ -93,6 +141,56 @@ jobs:
             VERSION=${{ env.VERSION }}
             GIT_COMMIT=${{ env.GIT_COMMIT }}
             GO_VERSION=${{ env.GO_VERSION }}
+          # A pre-release must not take over the tag people get by default.
           tags: |
             ${{ secrets.DOCKERHUB_USERNAME }}/sarin:${{ env.VERSION }}
-            ${{ secrets.DOCKERHUB_USERNAME }}/sarin:latest
+            ${{ !github.event.release.prerelease && format('{0}/sarin:latest', secrets.DOCKERHUB_USERNAME) || '' }}
+
+  # Moving pointer at the newest stable release, so flake users can follow
+  # releases instead of main. Fast-forward only.
+  release-branch:
+    name: Advance release branch
+    needs: build
+    if: ${{ !github.event.release.prerelease }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    # Serialize: concurrent releases would otherwise race the push.
+    concurrency:
+      group: release-branch
+      cancel-in-progress: false
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v7
+        with:
+          # The checks below compare against $GITHUB_SHA; check out exactly that.
+          ref: ${{ github.sha }}
+          fetch-depth: 0
+
+      - name: Point release at the tag
+        env:
+          TAG: ${{ github.ref_name }}
+        run: |
+          # Refresh: checkout fetched this, but as of a few seconds ago.
+          git fetch --no-tags origin "+refs/heads/release:refs/remotes/origin/release" || true
+
+          if git rev-parse --verify --quiet refs/remotes/origin/release >/dev/null; then
+            # At or behind the pointer: a re-run of this or an older release.
+            if git merge-base --is-ancestor "$GITHUB_SHA" refs/remotes/origin/release; then
+              if [ "$(git rev-parse refs/remotes/origin/release)" = "$GITHUB_SHA" ]; then
+                echo "::notice::release is already at $TAG"
+              else
+                echo "::warning::release is ahead of $TAG; leaving it alone"
+              fi
+              exit 0
+            fi
+            # The version job put this commit on main, so a pointer that is neither
+            # behind nor ahead is off main history and can never fast-forward again.
+            if ! git merge-base --is-ancestor refs/remotes/origin/release "$GITHUB_SHA"; then
+              echo "::error::release ($(git rev-parse --short refs/remotes/origin/release)) has diverged from main and can no longer fast-forward to $TAG; reset it by hand"
+              exit 1
+            fi
+          fi
+
+          git push origin "$GITHUB_SHA:refs/heads/release"
+          echo "::notice::release branch now points at $TAG"

.gitignore

@@ -1 +1,5 @@
 bin/*
+
+# Nix build artifacts
+result
+result-*

.golangci.yaml

@@ -1,7 +1,7 @@
 version: "2"
 
 run:
-  go: "1.26"
+  go: "1.27"
   concurrency: 12
 
 linters:
@@ -81,6 +81,11 @@ linters:
           - staticcheck
         text: "SA5011"
 
+      - linters:
+          - errcheck
+          - gosec
+        source: "lipgloss\\.Println\\("
+
 formatters:
   enable:
     - gofmt

Dockerfile

@@ -1,4 +1,4 @@
-ARG GO_VERSION=1.26.2
+ARG GO_VERSION=1.27.1
 
 FROM docker.io/library/golang:${GO_VERSION}-alpine AS builder
 

README.md

@@ -3,7 +3,9 @@
 ## Sarin is a high-performance HTTP load testing tool built with Go and fasthttp.
 
 [![Go Reference](https://pkg.go.dev/badge/go.aykhans.me/sarin.svg)](https://pkg.go.dev/go.aykhans.me/sarin)
-[![Go Report Card](https://goreportcard.com/badge/go.aykhans.me/sarin)](https://goreportcard.com/report/go.aykhans.me/sarin)
+[![Docker Pulls](https://img.shields.io/docker/pulls/aykhans/sarin)](https://hub.docker.com/r/aykhans/sarin)
+[![Downloads](https://img.shields.io/github/downloads/aykhans/sarin/total?cacheSeconds=3600)](https://github.com/aykhans/sarin/releases)
+[![Lint](https://img.shields.io/github/actions/workflow/status/aykhans/sarin/lint.yaml?branch=main&label=lint)](https://github.com/aykhans/sarin/actions/workflows/lint.yaml)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
 </div>
@@ -24,20 +26,19 @@ Sarin is designed for efficient HTTP load testing with minimal resource consumpt
 
 | ✅ Supported                                               | ❌ Not Supported                |
 | ---------------------------------------------------------- | ------------------------------- |
-| High-performance with low memory footprint                 | Detailed response body analysis |
+| High-performance with low memory footprint                 | Web UI or complex TUI           |
-| Long-running duration/count based tests                    | Extensive response statistics   |
+| Dynamic requests via 370+ template functions               | Detailed response body analysis |
-| Dynamic requests via 340+ template functions               | Web UI or complex TUI           |
 | Request scripting with Lua and JavaScript                  | Distributed load testing        |
 | Multiple proxy protocols<br>(HTTP, HTTPS, SOCKS5, SOCKS5H) | HTTP/2, HTTP/3, WebSocket, gRPC |
 | Captcha solving<br>(2Captcha, Anti-Captcha, CapSolver)     | Plugins / extensions ecosystem  |
-| Flexible config (CLI, ENV, YAML)                           |                                 |
 
 ## Installation
 
-### Docker (Recommended)
+<details open>
+<summary><b>Docker</b></summary>
 
 ```sh
-docker pull aykhans/sarin:latest
+docker run --rm -it aykhans/sarin:latest --version
 ```
 
 With a local config file:
@@ -52,13 +53,50 @@ With a remote config file:
 docker run --rm -it aykhans/sarin -f https://example.com/config.yaml
 ```
 
-### Pre-built Binaries
+</details>
+
+<details>
+<summary><b>Nix</b></summary>
+
+Run directly without installing (requires flakes enabled):
+
+```sh
+nix run github:aykhans/sarin/release -- -U http://example.com -r 100 -c 10
+```
+
+Install into your profile:
+
+```sh
+nix profile install github:aykhans/sarin/release
+```
+
+Or add it to your own flake via the overlay:
+
+```nix
+{
+  inputs.sarin.url = "github:aykhans/sarin/release";
+
+  # In your outputs, apply the overlay to nixpkgs:
+  # nixpkgs.overlays = [ inputs.sarin.overlays.default ];
+  # then reference pkgs.sarin
+}
+```
+
+The `release` branch tracks the newest stable release cut from `main`, so `nix flake update` moves between releases rather than following every commit; pre-releases are excluded. Pin an exact release with `github:aykhans/sarin/v1.4.2`, or track development with `github:aykhans/sarin` (the `main` branch).
+
+</details>
+
+<details>
+<summary><b>Pre-built Binaries</b></summary>
 
 Download the latest binaries from the [releases](https://github.com/aykhans/sarin/releases) page.
 
-### Building from Source
+</details>
 
-Requires [Go 1.26+](https://golang.org/dl/).
+<details>
+<summary><b>Building from Source</b></summary>
+
+Requires the [Go version declared in `go.mod`](go.mod).
 
 ```sh
 git clone https://github.com/aykhans/sarin.git && cd sarin
@@ -72,6 +110,8 @@ CGO_ENABLED=0 go build \
     -o sarin ./cmd/cli/main.go
 ```
 
+</details>
+
 ## Quick Start
 
 Send 10,000 GET requests with 50 concurrent connections and a random User-Agent for each request:
@@ -106,7 +146,7 @@ For detailed documentation on all configuration options (URL, method, timeout, c
 
 ## Templating
 
-Sarin supports Go templates in URL paths, methods, bodies, headers, params, cookies, and values. Use the 340+ built-in functions to generate dynamic data for each request.
+Sarin supports Go templates in URL paths, methods, bodies, headers, params, cookies, and values. Use the 370+ built-in functions to generate dynamic data for each request.
 
 **Example:**
 

Taskfile.yaml

@@ -3,7 +3,9 @@ version: "3"
 
 vars:
   BIN_DIR: ./bin
-  GOLANGCI_LINT_VERSION: v2.11.4
+  GO_VERSION:
+    sh: sed -n 's/^go //p' go.mod
+  GOLANGCI_LINT_VERSION: v2.13.2
   GOLANGCI: "{{.BIN_DIR}}/golangci-lint-{{.GOLANGCI_LINT_VERSION}}"
 
 tasks:
@@ -39,6 +41,11 @@ tasks:
     cmds:
       - "{{.GOLANGCI}} run"
 
+  nix-hash:
+    desc: Recompute nix/package.nix vendorHash after a dependency change.
+    cmds:
+      - nix run nixpkgs#nix-update -- --flake --version=skip --no-src default
+
   test:
     desc: Run Go tests.
     cmds:
@@ -74,7 +81,7 @@ tasks:
       - test -f {{.GOLANGCI}}
     cmds:
       - rm -f {{.GOLANGCI}}
-      - curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b {{.BIN_DIR}} {{.GOLANGCI_LINT_VERSION}}
+      - curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/main/install.sh | sh -s -- -b {{.BIN_DIR}} {{.GOLANGCI_LINT_VERSION}}
       - mv {{.BIN_DIR}}/golangci-lint {{.GOLANGCI}}
 
   docker-build:
@@ -82,7 +89,6 @@ tasks:
     vars:
       IMAGE_NAME: '{{.IMAGE_NAME | default "sarin"}}'
       TAG: '{{.TAG | default "latest"}}'
-      GO_VERSION: '{{.GO_VERSION | default ""}}'
       VERSION:
         sh: git describe --tags --always
       GIT_COMMIT:
@@ -90,7 +96,7 @@ tasks:
     cmds:
       - >-
         docker build
-        {{if .GO_VERSION}}--build-arg GO_VERSION={{.GO_VERSION}}{{end}}
+        --build-arg GO_VERSION={{.GO_VERSION}}
         --build-arg VERSION={{.VERSION}}
         --build-arg GIT_COMMIT={{.GIT_COMMIT}}
         -t {{.IMAGE_NAME}}:{{.TAG}}

cmd/cli/main.go

@@ -7,6 +7,7 @@ import (
 	"os/signal"
 	"syscall"
 
+	"charm.land/lipgloss/v2"
 	"go.aykhans.me/sarin/internal/config"
 	"go.aykhans.me/sarin/internal/sarin"
 	"go.aykhans.me/sarin/internal/types"
@@ -32,13 +33,13 @@ func main() {
 		utilsErr.OnType(func(err types.FieldValidationErrors) error {
 			for _, fieldErr := range err.Errors {
 				if fieldErr.Value == "" {
-					fmt.Fprintln(os.Stderr,
+					fmt.Fprint(os.Stderr, lipgloss.Sprintln(
 						config.StyleYellow.Render(fmt.Sprintf("[VALIDATION] Field '%s': ", fieldErr.Field))+fieldErr.Err.Error(),
-					)
+					))
 				} else {
-					fmt.Fprintln(os.Stderr,
+					fmt.Fprint(os.Stderr, lipgloss.Sprintln(
 						config.StyleYellow.Render(fmt.Sprintf("[VALIDATION] Field '%s' (%s): ", fieldErr.Field, fieldErr.Value))+fieldErr.Err.Error(),
-					)
+					))
 				}
 			}
 			os.Exit(1)
@@ -50,25 +51,25 @@ func main() {
 		ctx,
 		combinedConfig.Methods, combinedConfig.URL, *combinedConfig.Timeout,
 		*combinedConfig.Concurrency, combinedConfig.Requests, combinedConfig.Duration,
-		*combinedConfig.Quiet, *combinedConfig.Insecure, combinedConfig.Params, combinedConfig.Headers,
+		*combinedConfig.Progress == config.ConfigProgressTypeBar, *combinedConfig.Insecure, combinedConfig.Params, combinedConfig.Headers,
 		combinedConfig.Cookies, combinedConfig.Bodies, combinedConfig.Proxies, combinedConfig.Values,
 		*combinedConfig.Output != config.ConfigOutputTypeNone,
-		*combinedConfig.DryRun,
+		*combinedConfig.DryRun, *combinedConfig.LogLevel, *combinedConfig.LogFile,
 		combinedConfig.Lua, combinedConfig.Js,
 	)
 	_ = utilsErr.MustHandle(err,
 		utilsErr.OnType(func(err types.ProxyDialError) error {
-			fmt.Fprintln(os.Stderr, config.StyleRed.Render("[PROXY] ")+err.Error())
+			fmt.Fprint(os.Stderr, lipgloss.Sprintln(config.StyleRed.Render("[PROXY] ")+err.Error()))
 			os.Exit(1)
 			return nil
 		}),
 		utilsErr.OnSentinel(types.ErrScriptEmpty, func(err error) error {
-			fmt.Fprintln(os.Stderr, config.StyleRed.Render("[SCRIPT] ")+err.Error())
+			fmt.Fprint(os.Stderr, lipgloss.Sprintln(config.StyleRed.Render("[SCRIPT] ")+err.Error()))
 			os.Exit(1)
 			return nil
 		}),
 		utilsErr.OnType(func(err types.ScriptLoadError) error {
-			fmt.Fprintln(os.Stderr, config.StyleRed.Render("[SCRIPT] ")+err.Error())
+			fmt.Fprint(os.Stderr, lipgloss.Sprintln(config.StyleRed.Render("[SCRIPT] ")+err.Error()))
 			os.Exit(1)
 			return nil
 		}),

docs/configuration.md

@@ -26,7 +26,9 @@ Use `-s` or `--show-config` to see the final merged configuration before sending
 | [Concurrency](#concurrency) | `concurrency`<br>(number)           | `-concurrency` / `-c`<br>(number)            | `SARIN_CONCURRENCY`<br>(number)  | `1`     | Number of concurrent workers |
 | [Requests](#requests)       | `requests`<br>(number)              | `-requests` / `-r`<br>(number)               | `SARIN_REQUESTS`<br>(number)     | -       | Total requests to send       |
 | [Duration](#duration)       | `duration`<br>(duration)            | `-duration` / `-d`<br>(duration)             | `SARIN_DURATION`<br>(duration)   | -       | Test duration                |
-| [Quiet](#quiet)             | `quiet`<br>(boolean)                | `-quiet` / `-q`<br>(boolean)                 | `SARIN_QUIET`<br>(boolean)       | `false` | Hide progress bar and logs   |
+| [Log Level](#log-level)     | `logLevel`<br>(string)              | `-log-level` / `-l`<br>(string)              | `SARIN_LOG_LEVEL`<br>(string)    | `error` | Runtime log levels to emit   |
+| [Log File](#log-file)       | `logFile`<br>(string)               | `-log-file` / `-w`<br>(string)               | `SARIN_LOG_FILE`<br>(string)     | -       | Write runtime logs to a file |
+| [Progress](#progress)       | `progress`<br>(string)              | `-progress` / `-p`<br>(string)               | `SARIN_PROGRESS`<br>(string)     | `bar`   | Progress display (bar/none)  |
 | [Output](#output)           | `output`<br>(string)                | `-output` / `-o`<br>(string)                 | `SARIN_OUTPUT`<br>(string)       | `table` | Output format for stats      |
 | [Dry Run](#dry-run)         | `dryRun`<br>(boolean)               | `-dry-run` / `-z`<br>(boolean)               | `SARIN_DRY_RUN`<br>(boolean)     | `false` | Generate without sending     |
 | [Insecure](#insecure)       | `insecure`<br>(boolean)             | `-insecure` / `-I`<br>(boolean)              | `SARIN_INSECURE`<br>(boolean)    | `false` | Skip TLS verification        |
@@ -131,7 +133,7 @@ sarin -U "http://example.com/users/{{ fakeit_UUID }}" -r 1000 -c 10
 
 ## Method
 
-HTTP method(s). If multiple values are provided, Sarin cycles through them in order, starting from a random index for each request. Supports [templating](templating.md).
+HTTP method(s). Defaults to `GET`. If multiple values are provided, Sarin starts at a random index and cycles through them in order. Once the cycle completes, it picks a new random starting point. Supports [templating](templating.md).
 
 **YAML example:**
 
@@ -141,9 +143,9 @@ method: GET
 # OR
 
 method:
-  - GET
+    - GET
-  - POST
+    - POST
-  - PUT
+    - PUT
 ```
 
 **CLI example:**
@@ -160,7 +162,7 @@ SARIN_METHOD=GET
 
 ## Timeout
 
-Request timeout. Must be greater than 0.
+Request timeout. Must be greater than 0. Defaults to `10s`.
 
 Valid time units: `ns`, `us` (or `µs`), `ms`, `s`, `m`, `h`
 
@@ -168,7 +170,7 @@ Valid time units: `ns`, `us` (or `µs`), `ms`, `s`, `m`, `h`
 
 ## Concurrency
 
-Number of concurrent workers. Must be between 1 and 100,000,000.
+Number of concurrent workers. Must be between 1 and 100,000,000. Defaults to `1`.
 
 ## Requests
 
@@ -182,15 +184,34 @@ Valid time units: `ns`, `us` (or `µs`), `ms`, `s`, `m`, `h`
 
 **Examples:** `1m30s`, `25s`, `1h`
 
-## Quiet
+## Log Level
 
-Hide the progress bar and runtime logs.
+Runtime log levels to emit, comma-separated. Valid levels: `info`, `error`. Defaults to `error`.
+
+- `error`: errors that occur while generating or sending a request
+- `info`: every completed response
+
+Leave empty to disable logging entirely.
+
+**Examples:** `error` (only errors), `info` (only responses), `info,error` (both)
+
+## Log File
+
+Write runtime logs to this file instead of the terminal or stderr. The parent directory must exist.
+
+```sh
+sarin -U http://example.com -r 1000 --log-file ./run.log
+```
+
+## Progress
+
+Progress display. Valid values: `bar` (default), `none`. Use `none` to hide the progress bar.
 
 ## Output
 
 Output format for response statistics.
 
-Valid formats: `table`, `json`, `yaml`, `none`
+Valid formats: `table` (default), `json`, `yaml`, `none`
 
 Using `none` disables output and reduces memory usage since response statistics are not stored.
 
@@ -204,7 +225,7 @@ Skip TLS certificate verification.
 
 ## Body
 
-Request body. If multiple values are provided, Sarin cycles through them in order, starting from a random index for each request. Supports [templating](templating.md).
+Request body. If multiple values are provided, Sarin starts at a random index and cycles through them in order. Once the cycle completes, it picks a new random starting point. Supports [templating](templating.md).
 
 **YAML example:**
 
@@ -214,9 +235,9 @@ body: '{"product": "car"}'
 # OR
 
 body:
-  - '{"product": "car"}'
+    - '{"product": "car"}'
-  - '{"product": "phone"}'
+    - '{"product": "phone"}'
-  - '{"product": "watch"}'
+    - '{"product": "watch"}'
 ```
 
 **CLI example:**
@@ -241,19 +262,19 @@ When the same key appears as **separate entries** (in CLI or config file), all v
 
 ```yaml
 params:
-  key1: value1
+    key1: value1
-  key2: [value2, value3]  # cycles between value2 and value3
+    key2: [value2, value3] # cycles between value2 and value3
 
 # OR
 
 params:
-  - key1: value1
+    - key1: value1
-  - key2: [value2, value3]  # cycles between value2 and value3
+    - key2: [value2, value3] # cycles between value2 and value3
 
 # To send both values in every request, use separate entries:
 params:
-  - key2: value2
+    - key2: value2
-  - key2: value3  # both sent in every request
+    - key2: value3 # both sent in every request
 ```
 
 **CLI example:**
@@ -278,19 +299,19 @@ When the same key appears as **separate entries** (in CLI or config file), all v
 
 ```yaml
 headers:
-  key1: value1
+    key1: value1
-  key2: [value2, value3]  # cycles between value2 and value3
+    key2: [value2, value3] # cycles between value2 and value3
 
 # OR
 
 headers:
-  - key1: value1
+    - key1: value1
-  - key2: [value2, value3]  # cycles between value2 and value3
+    - key2: [value2, value3] # cycles between value2 and value3
 
 # To send both values in every request, use separate entries:
 headers:
-  - key2: value2
+    - key2: value2
-  - key2: value3  # both sent in every request
+    - key2: value3 # both sent in every request
 ```
 
 **CLI example:**
@@ -315,19 +336,19 @@ When the same key appears as **separate entries** (in CLI or config file), all v
 
 ```yaml
 cookies:
-  key1: value1
+    key1: value1
-  key2: [value2, value3]  # cycles between value2 and value3
+    key2: [value2, value3] # cycles between value2 and value3
 
 # OR
 
 cookies:
-  - key1: value1
+    - key1: value1
-  - key2: [value2, value3]  # cycles between value2 and value3
+    - key2: [value2, value3] # cycles between value2 and value3
 
 # To send both values in every request, use separate entries:
 cookies:
-  - key2: value2
+    - key2: value2
-  - key2: value3  # both sent in every request
+    - key2: value3 # both sent in every request
 ```
 
 **CLI example:**
@@ -344,7 +365,7 @@ SARIN_COOKIE="key1=value1"
 
 ## Proxy
 
-Proxy URL(s). If multiple values are provided, Sarin cycles through them in order, starting from a random index for each request.
+Proxy URL(s). If multiple values are provided, Sarin starts at a random index and cycles through them in order. Once the cycle completes, it picks a new random starting point.
 
 Supported protocols: `http`, `https`, `socks5`, `socks5h`
 
@@ -356,9 +377,9 @@ proxy: http://proxy1.com
 # OR
 
 proxy:
-  - http://proxy1.com
+    - http://proxy1.com
-  - socks5://proxy2.com
+    - socks5://proxy2.com
-  - socks5h://proxy3.com
+    - socks5h://proxy3.com
 ```
 
 **CLI example:**
@@ -387,9 +408,9 @@ values: "key=value"
 # OR
 
 values: |
-  key1=value1
+    key1=value1
-  key2=value2
+    key2=value2
-  key3=value3
+    key3=value3
 ```
 
 **CLI example:**

docs/examples.md

@@ -13,6 +13,7 @@ This guide provides practical examples for common Sarin use cases.
 - [File Uploads](#file-uploads)
 - [Using Proxies](#using-proxies)
 - [Output Formats](#output-formats)
+- [Runtime Logging](#runtime-logging)
 - [Docker Usage](#docker-usage)
 - [Dry Run Mode](#dry-run-mode)
 - [Show Configuration](#show-configuration)
@@ -372,7 +373,7 @@ body: '{"ip": "{{ fakeit_IPv4Address }}", "timestamp": "{{ fakeit_Date }}", "act
 
 </details>
 
-> For the complete list of 340+ template functions, see the **[Templating Guide](templating.md)**.
+> For the complete list of 370+ template functions, see the **[Templating Guide](templating.md)**.
 
 ## Solving Captchas
 
@@ -719,7 +720,7 @@ proxy: socks5://proxy.example.com:1080
 
 </details>
 
-**Multiple proxies (load balanced):**
+**Multiple proxies (randomly cycled):**
 
 ```sh
 sarin -U http://example.com -r 1000 -c 10 \
@@ -836,10 +837,10 @@ output: none
 
 </details>
 
-**Quiet mode (hide progress bar):**
+**Hide the progress bar:**
 
 ```sh
-sarin -U http://example.com -r 1000 -c 10 -q
+sarin -U http://example.com -r 1000 -c 10 -p none
 ```
 
 <details>
@@ -849,7 +850,42 @@ sarin -U http://example.com -r 1000 -c 10 -q
 url: http://example.com
 requests: 1000
 concurrency: 10
-quiet: true
+progress: none
+```
+
+</details>
+
+## Runtime Logging
+
+`--log-level` selects which runtime logs Sarin emits (comma-separated `info` and `error`, default `error`). `error` covers request and generation errors, `info` covers every completed response (status, duration, headers, body). Logs appear in the progress log box on an interactive terminal, go to stderr when piped, or go to a file with `--log-file`.
+
+**Log responses and errors:**
+
+```sh
+sarin -U http://example.com -r 1000 -c 10 -l info,error
+```
+
+**Write logs to a file (the progress bar stays on screen):**
+
+```sh
+sarin -U http://example.com -r 1000 -c 10 -l info --log-file ./run.log
+```
+
+**Capture logs while keeping results on stdout:**
+
+```sh
+sarin -U http://example.com -r 1000 -l info -o json > stats.json 2> run.log
+```
+
+<details>
+<summary>YAML equivalent</summary>
+
+```yaml
+url: http://example.com
+requests: 1000
+concurrency: 10
+logLevel: info,error
+logFile: ./run.log
 ```
 
 </details>

docs/templating.md

@@ -183,19 +183,19 @@ body: '{{ body_FormData "image" "@https://example.com/photo.jpg" }}'
 
 # Mixed text fields and files
 body: |
-  {{ body_FormData
+    {{ body_FormData
-     "title" "My Report"
+       "title" "My Report"
-     "author" "John Doe"
+       "author" "John Doe"
-     "cover" "@/path/to/cover.jpg"
+       "cover" "@/path/to/cover.jpg"
-     "document" "@/path/to/report.pdf"
+       "document" "@/path/to/report.pdf"
-  }}
+    }}
 
 # Multiple files with same field name
 body: |
-  {{ body_FormData
+    {{ body_FormData
-     "files" "@/path/to/file1.pdf"
+       "files" "@/path/to/file1.pdf"
-     "files" "@/path/to/file2.pdf"
+       "files" "@/path/to/file2.pdf"
-  }}
+    }}
 
 # Escape @ for literal value (sends "@username")
 body: '{{ body_FormData "twitter" "@@username" }}'
@@ -226,7 +226,7 @@ body: '{"file": "{{ file_Base64 "/path/to/document.pdf" }}", "filename": "docume
 body: '{"image": "{{ file_Base64 "https://example.com/photo.jpg" }}"}'
 
 # Combined with values for reuse
-values: "FILE_DATA={{ file_Base64 \"/path/to/file.bin\" }}"
+values: 'FILE_DATA={{ file_Base64 "/path/to/file.bin" }}'
 body: '{"data": "{{ .Values.FILE_DATA }}"}'
 ```
 
@@ -234,7 +234,7 @@ body: '{"data": "{{ .Values.FILE_DATA }}"}'
 
 Captcha functions solve a captcha challenge through a third-party solving service and return the resulting token, which can then be embedded directly into a request. They are intended for load testing endpoints protected by reCAPTCHA, hCaptcha, or Cloudflare Turnstile.
 
-The functions are organized by service: `twocaptcha_*`, `anticaptcha_*`, and `capsolver_*`. Each accepts the API key as the first argument so no global configuration is required — bring your own key and use any of the supported services per template.
+The functions are organized by service: `twocaptcha_*`, `anticaptcha_*`, and `capsolver_*`. Each accepts the API key as the first argument so no global configuration is required. Bring your own key and use any of the supported services per template.
 
 > **Important: performance and cost:**
 >
@@ -249,7 +249,7 @@ The functions are organized by service: `twocaptcha_*`, `anticaptcha_*`, and `ca
 
 ### 2Captcha
 
-Functions for the [2Captcha](https://2captcha.com) service. Note: 2Captcha **does not currently support hCaptcha** through their API.
+Functions for the [2Captcha](https://2captcha.com) service. Sarin supports reCAPTCHA v2, reCAPTCHA v3, and Cloudflare Turnstile through this integration.
 
 | Function                                                                 | Description                                                               |
 | ------------------------------------------------------------------------ | ------------------------------------------------------------------------- |
@@ -259,7 +259,7 @@ Functions for the [2Captcha](https://2captcha.com) service. Note: 2Captcha **doe
 
 ### Anti-Captcha
 
-Functions for the [Anti-Captcha](https://anti-captcha.com) service. This is currently the only service that supports all four captcha types end-to-end.
+Functions for the [Anti-Captcha](https://anti-captcha.com) service. This is the only Sarin captcha integration that exposes an hCaptcha function.
 
 | Function                                                                  | Description                                                                                                           |
 | ------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------- |
@@ -270,7 +270,7 @@ Functions for the [Anti-Captcha](https://anti-captcha.com) service. This is curr
 
 ### CapSolver
 
-Functions for the [CapSolver](https://capsolver.com) service. Note: CapSolver no longer supports hCaptcha.
+Functions for the [CapSolver](https://capsolver.com) service. Sarin supports reCAPTCHA v2, reCAPTCHA v3, and Cloudflare Turnstile through this integration.
 
 | Function                                                                | Description                                                               |
 | ----------------------------------------------------------------------- | ------------------------------------------------------------------------- |
@@ -302,7 +302,7 @@ body: |
 ```
 
 ```yaml
-# hCaptcha via Anti-Captcha (the only service that still supports it)
+# hCaptcha via Anti-Captcha
 method: POST
 url: https://example.com/protected
 body: |
@@ -325,10 +325,10 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 
 ### File
 
-| Function               | Description    | Example Output       |
+| Function               | Description    | Example Output        |
-| ---------------------- | -------------- | -------------------- |
+| ---------------------- | -------------- | --------------------- |
-| `fakeit_FileExtension` | File extension | `"nes"`              |
+| `fakeit_FileExtension` | File extension | `"nes"`               |
-| `fakeit_FileMimeType`  | MIME type      | `"application/json"` |
+| `fakeit_FileMimeType`  | MIME type      | `"application/x-wri"` |
 
 ### ID
 
@@ -347,7 +347,7 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | `fakeit_ProductFeature`     | Product feature     | `"ultra-lightweight"`             |
 | `fakeit_ProductMaterial`    | Product material    | `"brass"`                         |
 | `fakeit_ProductUPC`         | UPC code            | `"012780949980"`                  |
-| `fakeit_ProductAudience`    | Target audience     | `["adults"]`                      |
+| `fakeit_ProductAudience`    | Target audience     | `[adults]`                        |
 | `fakeit_ProductDimension`   | Product dimension   | `"medium"`                        |
 | `fakeit_ProductUseCase`     | Use case            | `"home"`                          |
 | `fakeit_ProductBenefit`     | Product benefit     | `"comfort"`                       |
@@ -356,23 +356,25 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 
 ### Person
 
-| Function                | Description            | Example Output           |
+| Function                | Description            | Example Output                                                      |
-| ----------------------- | ---------------------- | ------------------------ |
+| ----------------------- | ---------------------- | ------------------------------------------------------------------- |
-| `fakeit_Name`           | Full name              | `"Markus Moen"`          |
+| `fakeit_Name`           | Full name              | `"Priscilla Thornton"`                                              |
-| `fakeit_NamePrefix`     | Name prefix            | `"Mr."`                  |
+| `fakeit_NamePrefix`     | Name prefix            | `"Mr."`                                                             |
-| `fakeit_NameSuffix`     | Name suffix            | `"Jr."`                  |
+| `fakeit_NameSuffix`     | Name suffix            | `"Jr."`                                                             |
-| `fakeit_FirstName`      | First name             | `"Markus"`               |
+| `fakeit_FirstName`      | First name             | `"Priscilla"`                                                       |
-| `fakeit_MiddleName`     | Middle name            | `"Belinda"`              |
+| `fakeit_MiddleName`     | Middle name            | `"Belinda"`                                                         |
-| `fakeit_LastName`       | Last name              | `"Daniel"`               |
+| `fakeit_LastName`       | Last name              | `"Daniel"`                                                          |
-| `fakeit_Gender`         | Gender                 | `"male"`                 |
+| `fakeit_Gender`         | Gender                 | `"male"`                                                            |
-| `fakeit_Age`            | Age                    | `40`                     |
+| `fakeit_Age`            | Age                    | `40`                                                                |
-| `fakeit_Ethnicity`      | Ethnicity              | `"German"`               |
+| `fakeit_Ethnicity`      | Ethnicity              | `"German"`                                                          |
-| `fakeit_SSN`            | Social Security Number | `"296446360"`            |
+| `fakeit_SSN`            | Social Security Number | `"296446360"`                                                       |
-| `fakeit_EIN`            | Employer ID Number     | `"12-3456789"`           |
+| `fakeit_EIN`            | Employer ID Number     | `"12-3456789"`                                                      |
-| `fakeit_Hobby`          | Hobby                  | `"Swimming"`             |
+| `fakeit_Hobby`          | Hobby                  | `"Swimming"`                                                        |
-| `fakeit_Email`          | Email address          | `"markusmoen@pagac.net"` |
+| `fakeit_SocialMedia`    | Social media profile   | `"https://twitter.com/ImpossibleTrousers"`                          |
-| `fakeit_Phone`          | Phone number           | `"6136459948"`           |
+| `fakeit_Bio`            | Biography              | `"Born in New York, John grew up to become a Software Engineer..."` |
-| `fakeit_PhoneFormatted` | Formatted phone        | `"136-459-9489"`         |
+| `fakeit_Email`          | Email address          | `"priscilla.thornton@duncan.biz"`                                   |
+| `fakeit_Phone`          | Phone number           | `"6136459948"`                                                      |
+| `fakeit_PhoneFormatted` | Formatted phone        | `"136-459-9489"`                                                    |
 
 ### Generate
 
@@ -391,7 +393,7 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 
 | Function                                            | Description                  | Example Output                                       |
 | --------------------------------------------------- | ---------------------------- | ---------------------------------------------------- |
-| `fakeit_City`                                       | City name                    | `"Marcelside"`                                       |
+| `fakeit_City`                                       | City name                    | `"Reno"`                                             |
 | `fakeit_Country`                                    | Country name                 | `"United States of America"`                         |
 | `fakeit_CountryAbr`                                 | Country abbreviation         | `"US"`                                               |
 | `fakeit_State`                                      | State name                   | `"Illinois"`                                         |
@@ -400,7 +402,7 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | `fakeit_StreetName`                                 | Street name                  | `"View"`                                             |
 | `fakeit_StreetNumber`                               | Street number                | `"13645"`                                            |
 | `fakeit_StreetPrefix`                               | Street prefix                | `"East"`                                             |
-| `fakeit_StreetSuffix`                               | Street suffix                | `"Ave"`                                              |
+| `fakeit_StreetSuffix`                               | Street suffix                | `"side"`                                             |
 | `fakeit_Unit`                                       | Unit                         | `"Apt 123"`                                          |
 | `fakeit_Zip`                                        | ZIP code                     | `"13645"`                                            |
 | `fakeit_Latitude`                                   | Random latitude              | `-73.534056`                                         |
@@ -408,11 +410,23 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | `fakeit_LatitudeInRange(min float64, max float64)`  | Latitude in specified range  | `{{ fakeit_LatitudeInRange 0 90 }}` → `22.921026`    |
 | `fakeit_LongitudeInRange(min float64, max float64)` | Longitude in specified range | `{{ fakeit_LongitudeInRange 0 180 }}` → `122.471830` |
 
+### Airline
+
+| Function                      | Description       | Example Output                                       |
+| ----------------------------- | ----------------- | ---------------------------------------------------- |
+| `fakeit_AirlineAircraftType`  | Aircraft type     | `"narrowbody"`                                       |
+| `fakeit_AirlineAirplane`      | Airplane model    | `"Airbus A320"`                                      |
+| `fakeit_AirlineAirport`       | Airport name      | `"Hartsfield-Jackson Atlanta International Airport"` |
+| `fakeit_AirlineAirportIATA`   | Airport IATA code | `"ATL"`                                              |
+| `fakeit_AirlineFlightNumber`  | Flight number     | `"AA1234"`                                           |
+| `fakeit_AirlineRecordLocator` | Booking reference | `"ABCDEF"`                                           |
+| `fakeit_AirlineSeat`          | Seat assignment   | `"12A"`                                              |
+
 ### Game
 
-| Function          | Description | Example Output      |
+| Function          | Description | Example Output    |
-| ----------------- | ----------- | ------------------- |
+| ----------------- | ----------- | ----------------- |
-| `fakeit_Gamertag` | Gamer tag   | `"footinterpret63"` |
+| `fakeit_Gamertag` | Gamer tag   | `"TurkeyThinker"` |
 
 ### Beer
 
@@ -443,18 +457,22 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | ---------------------------------- | --------------------------- | ---------------- |
 | `fakeit_Word`                      | Random word                 | `"example"`      |
 | `fakeit_Noun`                      | Random noun                 | `"computer"`     |
-| `fakeit_NounCommon`                | Common noun                 | `"table"`        |
+| `fakeit_NounCommon`                | Common noun                 | `"group"`        |
 | `fakeit_NounConcrete`              | Concrete noun               | `"chair"`        |
 | `fakeit_NounAbstract`              | Abstract noun               | `"freedom"`      |
 | `fakeit_NounCollectivePeople`      | Collective noun (people)    | `"team"`         |
-| `fakeit_NounCollectiveAnimal`      | Collective noun (animal)    | `"herd"`         |
+| `fakeit_NounCollectiveAnimal`      | Collective noun (animal)    | `"leap"`         |
 | `fakeit_NounCollectiveThing`       | Collective noun (thing)     | `"bunch"`        |
 | `fakeit_NounCountable`             | Countable noun              | `"book"`         |
 | `fakeit_NounUncountable`           | Uncountable noun            | `"water"`        |
-| `fakeit_Verb`                      | Random verb                 | `"run"`          |
+| `fakeit_NounProper`                | Proper noun                 | `"John"`         |
+| `fakeit_NounDeterminer`            | Noun determiner             | `"your"`         |
+| `fakeit_Verb`                      | Random verb                 | `"would"`        |
 | `fakeit_VerbAction`                | Action verb                 | `"jump"`         |
 | `fakeit_VerbLinking`               | Linking verb                | `"is"`           |
 | `fakeit_VerbHelping`               | Helping verb                | `"can"`          |
+| `fakeit_VerbTransitive`            | Transitive verb             | `"follow"`       |
+| `fakeit_VerbIntransitive`          | Intransitive verb           | `"laugh"`        |
 | `fakeit_Adverb`                    | Random adverb               | `"quickly"`      |
 | `fakeit_AdverbManner`              | Manner adverb               | `"carefully"`    |
 | `fakeit_AdverbDegree`              | Degree adverb               | `"very"`         |
@@ -468,7 +486,7 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | `fakeit_PrepositionDouble`         | Double preposition          | `"out of"`       |
 | `fakeit_PrepositionCompound`       | Compound preposition        | `"according to"` |
 | `fakeit_Adjective`                 | Random adjective            | `"beautiful"`    |
-| `fakeit_AdjectiveDescriptive`      | Descriptive adjective       | `"large"`        |
+| `fakeit_AdjectiveDescriptive`      | Descriptive adjective       | `"tired"`        |
 | `fakeit_AdjectiveQuantitative`     | Quantitative adjective      | `"many"`         |
 | `fakeit_AdjectiveProper`           | Proper adjective            | `"American"`     |
 | `fakeit_AdjectiveDemonstrative`    | Demonstrative adjective     | `"this"`         |
@@ -483,26 +501,33 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | `fakeit_PronounDemonstrative`      | Demonstrative pronoun       | `"that"`         |
 | `fakeit_PronounInterrogative`      | Interrogative pronoun       | `"who"`          |
 | `fakeit_PronounRelative`           | Relative pronoun            | `"which"`        |
+| `fakeit_PronounIndefinite`         | Indefinite pronoun          | `"few"`          |
 | `fakeit_Connective`                | Random connective           | `"however"`      |
 | `fakeit_ConnectiveTime`            | Time connective             | `"then"`         |
-| `fakeit_ConnectiveComparative`     | Comparative connective      | `"similarly"`    |
+| `fakeit_ConnectiveComparative`     | Comparative connective      | `"after all"`    |
-| `fakeit_ConnectiveComplaint`       | Complaint connective        | `"although"`     |
+| `fakeit_ConnectiveComplaint`       | Complaint connective        | `"i.e."`         |
 | `fakeit_ConnectiveListing`         | Listing connective          | `"firstly"`      |
 | `fakeit_ConnectiveCasual`          | Casual connective           | `"because"`      |
 | `fakeit_ConnectiveExamplify`       | Examplify connective        | `"for example"`  |
+| `fakeit_Interjection`              | Interjection                | `"wow"`          |
 
 ### Text
 
-| Function                                                                                 | Description                                     | Example                                               |
+| Function                                                                                 | Description                                     | Example                                       |
-| ---------------------------------------------------------------------------------------- | ----------------------------------------------- | ----------------------------------------------------- |
+| ---------------------------------------------------------------------------------------- | ----------------------------------------------- | --------------------------------------------- |
-| `fakeit_Sentence(wordCount ...int)`                                                      | Random sentence (optional word count)           | `{{ fakeit_Sentence }}` or `{{ fakeit_Sentence 10 }}` |
+| `fakeit_Sentence`                                                                        | Random sentence                                 | `{{ fakeit_Sentence }}`                       |
-| `fakeit_Paragraph`                                                                       | Random paragraph                                | `{{ fakeit_Paragraph }}`                              |
+| `fakeit_Paragraph`                                                                       | Random paragraph                                | `{{ fakeit_Paragraph }}`                      |
-| `fakeit_LoremIpsumWord`                                                                  | Lorem ipsum word                                | `"lorem"`                                             |
+| `fakeit_LoremIpsumWord`                                                                  | Lorem ipsum word                                | `"eveniet"`                                   |
-| `fakeit_LoremIpsumSentence(wordCount int)`                                               | Lorem ipsum sentence with specified word count  | `{{ fakeit_LoremIpsumSentence 5 }}`                   |
+| `fakeit_LoremIpsumSentence(wordCount int)`                                               | Lorem ipsum sentence with specified word count  | `{{ fakeit_LoremIpsumSentence 5 }}`           |
-| `fakeit_LoremIpsumParagraph(paragraphs int, sentences int, words int, separator string)` | Lorem ipsum paragraphs with specified structure | `{{ fakeit_LoremIpsumParagraph 1 3 5 "\n" }}`         |
+| `fakeit_LoremIpsumParagraph(paragraphs int, sentences int, words int, separator string)` | Lorem ipsum paragraphs with specified structure | `{{ fakeit_LoremIpsumParagraph 1 3 5 "\n" }}` |
-| `fakeit_Question`                                                                        | Random question                                 | `"What is your name?"`                                |
+| `fakeit_Question`                                                                        | Random question                                 | `"What is the marginal gain from fear?"`      |
-| `fakeit_Quote`                                                                           | Random quote                                    | `"Life is what happens..."`                           |
+| `fakeit_Quote`                                                                           | Random quote                                    | `"Energy is contagious—so is fear"`           |
-| `fakeit_Phrase`                                                                          | Random phrase                                   | `"a piece of cake"`                                   |
+| `fakeit_Phrase`                                                                          | Random phrase                                   | `"how many siblings do you have"`             |
+| `fakeit_PhraseNoun`                                                                      | Noun phrase                                     | `"a tribe"`                                   |
+| `fakeit_PhraseVerb`                                                                      | Verb phrase                                     | `"fully integrate a system"`                  |
+| `fakeit_PhraseAdverb`                                                                    | Adverb phrase                                   | `"fully gladly"`                              |
+| `fakeit_PhrasePreposition`                                                               | Preposition phrase                              | `"out the black thing"`                       |
+| `fakeit_Comment`                                                                         | Comment                                         | `"add some a little bit team"`                |
 
 ### Foods
 
@@ -515,6 +540,7 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | `fakeit_Dinner`    | Dinner food    | `"Wild addicting dip"`                   |
 | `fakeit_Snack`     | Snack          | `"Trail mix"`                            |
 | `fakeit_Dessert`   | Dessert        | `"French napoleons"`                     |
+| `fakeit_Drink`     | Drink          | `"Soda"`                                 |
 
 ### Misc
 
@@ -525,20 +551,23 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 
 ### Color
 
-| Function            | Description        | Example Output                                            |
+| Function            | Description        | Example Output                              |
-| ------------------- | ------------------ | --------------------------------------------------------- |
+| ------------------- | ------------------ | ------------------------------------------- |
-| `fakeit_Color`      | Color name         | `"MediumOrchid"`                                          |
+| `fakeit_Color`      | Color name         | `"MediumOrchid"`                            |
-| `fakeit_HexColor`   | Hex color          | `"#a99fb4"`                                               |
+| `fakeit_HexColor`   | Hex color          | `"#a99fb4"`                                 |
-| `fakeit_RGBColor`   | RGB color          | `[85, 224, 195]`                                          |
+| `fakeit_RGBColor`   | RGB color          | `[85 224 195]`                              |
-| `fakeit_SafeColor`  | Safe color         | `"black"`                                                 |
+| `fakeit_HSLColor`   | HSL color          | `[210 85 50]`                               |
-| `fakeit_NiceColors` | Nice color palette | `["#cfffdd", "#b4dec1", "#5c5863", "#a85163", "#ff1f4c"]` |
+| `fakeit_SafeColor`  | Safe color         | `"black"`                                   |
+| `fakeit_NiceColors` | Nice color palette | `[#cfffdd #b4dec1 #5c5863 #a85163 #ff1f4c]` |
 
 ### Image
 
-| Function                                  | Description               | Example                          |
+| Function                                  | Description                | Example                          |
-| ----------------------------------------- | ------------------------- | -------------------------------- |
+| ----------------------------------------- | -------------------------- | -------------------------------- |
-| `fakeit_ImageJpeg(width int, height int)` | Generate JPEG image bytes | `{{ fakeit_ImageJpeg 100 100 }}` |
+| `fakeit_ImageJpeg(width int, height int)` | Generate a JPEG byte slice | `{{ fakeit_ImageJpeg 100 100 }}` |
-| `fakeit_ImagePng(width int, height int)`  | Generate PNG image bytes  | `{{ fakeit_ImagePng 100 100 }}`  |
+| `fakeit_ImagePng(width int, height int)`  | Generate a PNG byte slice  | `{{ fakeit_ImagePng 100 100 }}`  |
+
+> **Note:** Go templates render byte slices as decimal lists, not raw binary image data. Use `{{ json_Encode (fakeit_ImagePng 100 100) }}` to produce a Base64-encoded JSON string. These functions cannot write raw image bytes directly through body templating.
 
 ### Internet
 
@@ -567,16 +596,16 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 
 | Function           | Description     | Example Output     |
 | ------------------ | --------------- | ------------------ |
-| `fakeit_InputName` | HTML input name | `"email"`          |
+| `fakeit_InputName` | HTML input name | `"message"`        |
 | `fakeit_Svg`       | SVG image       | `"<svg>...</svg>"` |
 
 ### Date/Time
 
 | Function                                           | Description                       | Example                                                                              |
 | -------------------------------------------------- | --------------------------------- | ------------------------------------------------------------------------------------ |
-| `fakeit_Date`                                      | Random date                       | `2023-06-15 14:30:00`                                                                |
+| `fakeit_Date`                                      | Random date                       | `2013-11-07 04:31:13.726582492 +0000 UTC`                                            |
-| `fakeit_PastDate`                                  | Past date                         | `2022-03-10 09:15:00`                                                                |
+| `fakeit_PastDate`                                  | Date 1–12 hours before now        | Current time − 1–12 hours                                                            |
-| `fakeit_FutureDate`                                | Future date                       | `2025-12-20 18:45:00`                                                                |
+| `fakeit_FutureDate`                                | Date 1–12 hours after now         | Current time + 1–12 hours                                                            |
 | `fakeit_DateRange(start time.Time, end time.Time)` | Random date between start and end | `{{ fakeit_DateRange (strings_ToDate "2020-01-01") (strings_ToDate "2025-12-31") }}` |
 | `fakeit_NanoSecond`                                | Nanosecond                        | `123456789`                                                                          |
 | `fakeit_Second`                                    | Second (0-59)                     | `45`                                                                                 |
@@ -587,11 +616,11 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | `fakeit_Day`                                       | Day (1-31)                        | `15`                                                                                 |
 | `fakeit_WeekDay`                                   | Weekday                           | `"Monday"`                                                                           |
 | `fakeit_Year`                                      | Year                              | `2024`                                                                               |
-| `fakeit_TimeZone`                                  | Timezone                          | `"America/New_York"`                                                                 |
+| `fakeit_TimeZone`                                  | Timezone name                     | `"West Pacific Standard Time"`                                                       |
 | `fakeit_TimeZoneAbv`                               | Timezone abbreviation             | `"EST"`                                                                              |
-| `fakeit_TimeZoneFull`                              | Full timezone                     | `"Eastern Standard Time"`                                                            |
+| `fakeit_TimeZoneFull`                              | Full timezone                     | `"(UTC+10:00) Guam, Port Moresby"`                                                   |
 | `fakeit_TimeZoneOffset`                            | Timezone offset                   | `-5`                                                                                 |
-| `fakeit_TimeZoneRegion`                            | Timezone region                   | `"America"`                                                                          |
+| `fakeit_TimeZoneRegion`                            | Timezone region                   | `"Indian/Chagos"`                                                                    |
 
 ### Payment
 
@@ -607,8 +636,8 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | `fakeit_AchRouting`                      | ACH routing number                                    | `"513715684"`                                                  |
 | `fakeit_AchAccount`                      | ACH account number                                    | `"491527954328"`                                               |
 | `fakeit_BitcoinAddress`                  | Bitcoin address                                       | `"1BoatSLRHtKNngkdXEeobR76b53LETtpyT"`                         |
-| `fakeit_BitcoinPrivateKey`               | Bitcoin private key                                   | `"5HueCGU8rMjxEXxiPuD5BDuG6o5xjA7QkbPp"`                       |
+| `fakeit_BitcoinPrivateKey`               | Bitcoin private key                                   | `"5JMZxkQX2PgaasaHc8wnWLNdMu7rxeU7xS64ev7RWNinacicPfm"`        |
-| `fakeit_BankName`                        | Bank name                                             | `"Wells Fargo"`                                                |
+| `fakeit_BankName`                        | Bank name                                             | `"Toronto Dominion Bank"`                                      |
 | `fakeit_BankType`                        | Bank type                                             | `"Investment Bank"`                                            |
 
 ### Finance
@@ -620,17 +649,17 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 
 ### Company
 
-| Function               | Description    | Example Output                             |
+| Function               | Description    | Example Output         |
-| ---------------------- | -------------- | ------------------------------------------ |
+| ---------------------- | -------------- | ---------------------- |
-| `fakeit_BS`            | Business speak | `"front-end"`                              |
+| `fakeit_BS`            | Business speak | `"front-end"`          |
-| `fakeit_Blurb`         | Company blurb  | `"word"`                                   |
+| `fakeit_Blurb`         | Company blurb  | `"Teamwork"`           |
-| `fakeit_BuzzWord`      | Buzzword       | `"disintermediate"`                        |
+| `fakeit_BuzzWord`      | Buzzword       | `"disintermediate"`    |
-| `fakeit_Company`       | Company name   | `"Moen, Pagac and Wuckert"`                |
+| `fakeit_Company`       | Company name   | `"TransparaGov"`       |
-| `fakeit_CompanySuffix` | Company suffix | `"Inc"`                                    |
+| `fakeit_CompanySuffix` | Company suffix | `"Inc"`                |
-| `fakeit_JobDescriptor` | Job descriptor | `"Central"`                                |
+| `fakeit_JobDescriptor` | Job descriptor | `"Central"`            |
-| `fakeit_JobLevel`      | Job level      | `"Assurance"`                              |
+| `fakeit_JobLevel`      | Job level      | `"Assurance"`          |
-| `fakeit_JobTitle`      | Job title      | `"Director"`                               |
+| `fakeit_JobTitle`      | Job title      | `"Director"`           |
-| `fakeit_Slogan`        | Company slogan | `"Universal seamless Focus, interactive."` |
+| `fakeit_Slogan`        | Company slogan | `"Made of styrofoam."` |
 
 ### Hacker
 
@@ -695,9 +724,9 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | `fakeit_EmojiTools`       | Tools emoji                                    | `"🔧"`                                                 |
 | `fakeit_EmojiWeather`     | Weather emoji                                  | `"☀️"`                                                 |
 | `fakeit_EmojiJob`         | Job emoji                                      | `"👨‍💻"`                                                 |
-| `fakeit_EmojiPerson`      | Person emoji                                   | `"👤"`                                                 |
+| `fakeit_EmojiPerson`      | Person emoji                                   | `"🧓"`                                                 |
-| `fakeit_EmojiGesture`     | Gesture emoji                                  | `"🙌"`                                                 |
+| `fakeit_EmojiGesture`     | Gesture emoji                                  | `"🤦‍♀️"`                                                 |
-| `fakeit_EmojiCostume`     | Costume emoji                                  | `"🎃"`                                                 |
+| `fakeit_EmojiCostume`     | Costume emoji                                  | `"🧞"`                                                 |
 | `fakeit_EmojiSentence`    | Emoji sentence with random emojis interspersed | `"Weekends reserve time for 🖼️ Disc 🏨 golf and day."` |
 
 ### Language
@@ -706,31 +735,35 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | ----------------------------- | --------------------- | -------------- |
 | `fakeit_Language`             | Language              | `"English"`    |
 | `fakeit_LanguageAbbreviation` | Language abbreviation | `"en"`         |
+| `fakeit_LanguageBCP`          | BCP language tag      | `"en-US"`      |
 | `fakeit_ProgrammingLanguage`  | Programming language  | `"Go"`         |
 
 ### Number
 
-| Function                                        | Description                         | Example                                    |
+| Function                                        | Description                         | Example                                      |
-| ----------------------------------------------- | ----------------------------------- | ------------------------------------------ |
+| ----------------------------------------------- | ----------------------------------- | -------------------------------------------- |
-| `fakeit_Number(min int, max int)`               | Random number in range              | `{{ fakeit_Number 1 100 }}` → `42`         |
+| `fakeit_Number(min int, max int)`               | Random number in range              | `{{ fakeit_Number 1 100 }}` → `42`           |
-| `fakeit_Int`                                    | Random int                          | `{{ fakeit_Int }}`                         |
+| `fakeit_Int`                                    | Random int                          | `{{ fakeit_Int }}`                           |
-| `fakeit_IntN(n int)`                            | Random int from 0 to n              | `{{ fakeit_IntN 100 }}`                    |
+| `fakeit_IntN(n int)`                            | Random int in `[0, n)`              | `{{ fakeit_IntN 100 }}`                      |
-| `fakeit_Int8`                                   | Random int8                         | `{{ fakeit_Int8 }}`                        |
+| `fakeit_Int8`                                   | Random int8                         | `{{ fakeit_Int8 }}`                          |
-| `fakeit_Int16`                                  | Random int16                        | `{{ fakeit_Int16 }}`                       |
+| `fakeit_Int16`                                  | Random int16                        | `{{ fakeit_Int16 }}`                         |
-| `fakeit_Int32`                                  | Random int32                        | `{{ fakeit_Int32 }}`                       |
+| `fakeit_Int32`                                  | Random int32                        | `{{ fakeit_Int32 }}`                         |
-| `fakeit_Int64`                                  | Random int64                        | `{{ fakeit_Int64 }}`                       |
+| `fakeit_Int64`                                  | Random int64                        | `{{ fakeit_Int64 }}`                         |
-| `fakeit_Uint`                                   | Random uint                         | `{{ fakeit_Uint }}`                        |
+| `fakeit_IntRange(min int, max int)`             | Random int in range                 | `{{ fakeit_IntRange -10 10 }}`               |
-| `fakeit_UintN(n uint)`                          | Random uint from 0 to n             | `{{ fakeit_UintN 100 }}`                   |
+| `fakeit_Uint`                                   | Random uint                         | `{{ fakeit_Uint }}`                          |
-| `fakeit_Uint8`                                  | Random uint8                        | `{{ fakeit_Uint8 }}`                       |
+| `fakeit_UintN(n uint)`                          | Random uint in `[0, n)`             | `{{ fakeit_UintN 100 }}`                     |
-| `fakeit_Uint16`                                 | Random uint16                       | `{{ fakeit_Uint16 }}`                      |
+| `fakeit_Uint8`                                  | Random uint8                        | `{{ fakeit_Uint8 }}`                         |
-| `fakeit_Uint32`                                 | Random uint32                       | `{{ fakeit_Uint32 }}`                      |
+| `fakeit_Uint16`                                 | Random uint16                       | `{{ fakeit_Uint16 }}`                        |
-| `fakeit_Uint64`                                 | Random uint64                       | `{{ fakeit_Uint64 }}`                      |
+| `fakeit_Uint32`                                 | Random uint32                       | `{{ fakeit_Uint32 }}`                        |
-| `fakeit_Float32`                                | Random float32                      | `{{ fakeit_Float32 }}`                     |
+| `fakeit_Uint64`                                 | Random uint64                       | `{{ fakeit_Uint64 }}`                        |
-| `fakeit_Float32Range(min float32, max float32)` | Random float32 in range             | `{{ fakeit_Float32Range 0 100 }}`          |
+| `fakeit_UintRange(min uint, max uint)`          | Random uint in range                | `{{ fakeit_UintRange 10 100 }}`              |
-| `fakeit_Float64`                                | Random float64                      | `{{ fakeit_Float64 }}`                     |
+| `fakeit_Float32`                                | Random float32                      | `{{ fakeit_Float32 }}`                       |
-| `fakeit_Float64Range(min float64, max float64)` | Random float64 in range             | `{{ fakeit_Float64Range 0 100 }}`          |
+| `fakeit_Float32Range(min float32, max float32)` | Random float32 in range             | `{{ fakeit_Float32Range 0 100 }}`            |
-| `fakeit_RandomInt(slice []int)`                 | Random int from slice               | `{{ fakeit_RandomInt (slice_Int 1 2 3) }}` |
+| `fakeit_Float64`                                | Random float64                      | `{{ fakeit_Float64 }}`                       |
-| `fakeit_HexUint(bits int)`                      | Random hex uint with specified bits | `{{ fakeit_HexUint 8 }}` → `"0xff"`        |
+| `fakeit_Float64Range(min float64, max float64)` | Random float64 in range             | `{{ fakeit_Float64Range 0 100 }}`            |
+| `fakeit_RandomInt(slice []int)`                 | Random int from slice               | `{{ fakeit_RandomInt (slice_Int 1 2 3) }}`   |
+| `fakeit_RandomUint(slice []uint)`               | Random uint from slice              | `{{ fakeit_RandomUint (slice_Uint 1 2 3) }}` |
+| `fakeit_HexUint(bits int)`                      | Random hex uint with specified bits | `{{ fakeit_HexUint 8 }}` → `"0xff"`          |
 
 ### String
 
@@ -740,6 +773,7 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 | `fakeit_DigitN(n uint)`               | Generate `n` random digits      | `{{ fakeit_DigitN 5 }}` → `"71364"`                             |
 | `fakeit_Letter`                       | Single random letter            | `"g"`                                                           |
 | `fakeit_LetterN(n uint)`              | Generate `n` random letters     | `{{ fakeit_LetterN 10 }}` → `"gbRMaRxHki"`                      |
+| `fakeit_Vowel`                        | Single lowercase vowel          | `"a"`                                                           |
 | `fakeit_Lexify(pattern string)`       | Replace `?` with random letters | `{{ fakeit_Lexify "?????@??????.com" }}` → `"billy@mister.com"` |
 | `fakeit_Numerify(pattern string)`     | Replace `#` with random digits  | `{{ fakeit_Numerify "(###)###-####" }}` → `"(555)867-5309"`     |
 | `fakeit_RandomString(slice []string)` | Random string from slice        | `{{ fakeit_RandomString (slice_Str "a" "b" "c") }}`             |
@@ -754,26 +788,26 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 
 ### Minecraft
 
-| Function                          | Description       | Example Output   |
+| Function                          | Description       | Example Output      |
-| --------------------------------- | ----------------- | ---------------- |
+| --------------------------------- | ----------------- | ------------------- |
-| `fakeit_MinecraftOre`             | Minecraft ore     | `"coal"`         |
+| `fakeit_MinecraftOre`             | Minecraft ore     | `"coal"`            |
-| `fakeit_MinecraftWood`            | Minecraft wood    | `"oak"`          |
+| `fakeit_MinecraftWood`            | Minecraft wood    | `"oak"`             |
-| `fakeit_MinecraftArmorTier`       | Armor tier        | `"iron"`         |
+| `fakeit_MinecraftArmorTier`       | Armor tier        | `"iron"`            |
-| `fakeit_MinecraftArmorPart`       | Armor part        | `"helmet"`       |
+| `fakeit_MinecraftArmorPart`       | Armor part        | `"helmet"`          |
-| `fakeit_MinecraftWeapon`          | Minecraft weapon  | `"bow"`          |
+| `fakeit_MinecraftWeapon`          | Minecraft weapon  | `"bow"`             |
-| `fakeit_MinecraftTool`            | Minecraft tool    | `"shovel"`       |
+| `fakeit_MinecraftTool`            | Minecraft tool    | `"shovel"`          |
-| `fakeit_MinecraftDye`             | Minecraft dye     | `"white"`        |
+| `fakeit_MinecraftDye`             | Minecraft dye     | `"white"`           |
-| `fakeit_MinecraftFood`            | Minecraft food    | `"apple"`        |
+| `fakeit_MinecraftFood`            | Minecraft food    | `"apple"`           |
-| `fakeit_MinecraftAnimal`          | Minecraft animal  | `"chicken"`      |
+| `fakeit_MinecraftAnimal`          | Minecraft animal  | `"chicken"`         |
-| `fakeit_MinecraftVillagerJob`     | Villager job      | `"farmer"`       |
+| `fakeit_MinecraftVillagerJob`     | Villager job      | `"farmer"`          |
-| `fakeit_MinecraftVillagerStation` | Villager station  | `"furnace"`      |
+| `fakeit_MinecraftVillagerStation` | Villager station  | `"stonecutter"`     |
-| `fakeit_MinecraftVillagerLevel`   | Villager level    | `"master"`       |
+| `fakeit_MinecraftVillagerLevel`   | Villager level    | `"master"`          |
-| `fakeit_MinecraftMobPassive`      | Passive mob       | `"cow"`          |
+| `fakeit_MinecraftMobPassive`      | Passive mob       | `"cow"`             |
-| `fakeit_MinecraftMobNeutral`      | Neutral mob       | `"bee"`          |
+| `fakeit_MinecraftMobNeutral`      | Neutral mob       | `"bee"`             |
-| `fakeit_MinecraftMobHostile`      | Hostile mob       | `"spider"`       |
+| `fakeit_MinecraftMobHostile`      | Hostile mob       | `"wither skeleton"` |
-| `fakeit_MinecraftMobBoss`         | Boss mob          | `"ender dragon"` |
+| `fakeit_MinecraftMobBoss`         | Boss mob          | `"ender dragon"`    |
-| `fakeit_MinecraftBiome`           | Minecraft biome   | `"forest"`       |
+| `fakeit_MinecraftBiome`           | Minecraft biome   | `"forest"`          |
-| `fakeit_MinecraftWeather`         | Minecraft weather | `"rain"`         |
+| `fakeit_MinecraftWeather`         | Minecraft weather | `"rain"`            |
 
 ### Book
 
@@ -792,26 +826,28 @@ These functions are powered by [gofakeit](https://github.com/brianvoe/gofakeit)
 
 ### Error
 
-| Function                 | Description       | Example Output                     |
+| Function                 | Description       | Example Output                                  |
-| ------------------------ | ----------------- | ---------------------------------- |
+| ------------------------ | ----------------- | ----------------------------------------------- |
-| `fakeit_Error`           | Random error      | `"connection refused"`             |
+| `fakeit_Error`           | Random error      | `"variable assigned before declaration"`        |
-| `fakeit_ErrorDatabase`   | Database error    | `"database connection failed"`     |
+| `fakeit_ErrorObject`     | Error object      | `"protocol"`                                    |
-| `fakeit_ErrorGRPC`       | gRPC error        | `"rpc error: code = Unavailable"`  |
+| `fakeit_ErrorDatabase`   | Database error    | `"destination pointer is nil"`                  |
-| `fakeit_ErrorHTTP`       | HTTP error        | `"HTTP 500 Internal Server Error"` |
+| `fakeit_ErrorGRPC`       | gRPC error        | `"connection refused"`                          |
-| `fakeit_ErrorHTTPClient` | HTTP client error | `"HTTP 404 Not Found"`             |
+| `fakeit_ErrorHTTP`       | HTTP error        | `"wrote more than the declared Content-Length"` |
-| `fakeit_ErrorHTTPServer` | HTTP server error | `"HTTP 503 Service Unavailable"`   |
+| `fakeit_ErrorHTTPClient` | HTTP client error | `"expectation failed"`                          |
-| `fakeit_ErrorRuntime`    | Runtime error     | `"panic: runtime error"`           |
+| `fakeit_ErrorHTTPServer` | HTTP server error | `"not extended"`                                |
+| `fakeit_ErrorRuntime`    | Runtime error     | `"expected 2 arguments, got 3"`                 |
+| `fakeit_ErrorValidation` | Validation error  | `"missing required field"`                      |
 
 ### School
 
-| Function        | Description | Example Output         |
+| Function        | Description | Example Output               |
-| --------------- | ----------- | ---------------------- |
+| --------------- | ----------- | ---------------------------- |
-| `fakeit_School` | School name | `"Harvard University"` |
+| `fakeit_School` | School name | `"Hillside Private Academy"` |
 
 ### Song
 
-| Function            | Description | Example Output        |
+| Function            | Description | Example Output           |
-| ------------------- | ----------- | --------------------- |
+| ------------------- | ----------- | ------------------------ |
-| `fakeit_SongName`   | Song name   | `"Bohemian Rhapsody"` |
+| `fakeit_SongName`   | Song name   | `"What Was I Made For?"` |
-| `fakeit_SongArtist` | Song artist | `"Queen"`             |
+| `fakeit_SongArtist` | Song artist | `"Queen"`                |
-| `fakeit_SongGenre`  | Song genre  | `"Rock"`              |
+| `fakeit_SongGenre`  | Song genre  | `"Rock"`                 |

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1789006805,
+        "narHash": "sha256-xB8mKMOx1IA9vTDNLmJZ6n4wCMq/cuWBBOzGCRnqxrU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "8ce4ef6cb6f871616146b9fe26d2a5ae594e94fe",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,55 @@
+{
+  description = "Sarin - high-performance HTTP load testing tool built with Go and fasthttp";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      inherit (nixpkgs) lib;
+
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+
+      forAllSystems = f: lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
+
+      rev = self.rev or self.dirtyRev or "unknown";
+
+      # self.lastModifiedDate is "YYYYMMDDHHMMSS"; reshape to RFC 3339 (UTC).
+      raw = self.lastModifiedDate or "19700101000000";
+      s = i: n: lib.substring i n raw;
+      buildDate = "${s 0 4}-${s 4 2}-${s 6 2}T${s 8 2}:${s 10 2}:${s 12 2}Z";
+    in
+    {
+      packages = forAllSystems (pkgs: {
+        default = pkgs.callPackage ./nix/package.nix {
+          inherit rev buildDate;
+        };
+      });
+
+      # nix run github:aykhans/sarin/release -- <args>
+      apps = forAllSystems (pkgs: {
+        default = {
+          type = "app";
+          program = "${self.packages.${pkgs.stdenv.hostPlatform.system}.default}/bin/sarin";
+          meta.description = "High-performance HTTP load testing tool";
+        };
+      });
+
+      devShells = forAllSystems (pkgs: {
+        default = pkgs.mkShell {
+          packages = [ pkgs.go_1_27 pkgs.golangci-lint pkgs.go-task ];
+        };
+      });
+
+      # For downstream flakes: inputs.sarin.overlays.default
+      overlays.default = final: _prev: {
+        sarin = final.callPackage ./nix/package.nix { };
+      };
+    };
+}

go.mod

@@ -1,58 +1,53 @@
 module go.aykhans.me/sarin
 
-go 1.26.2
+go 1.27.1
 
 require (
-	github.com/brianvoe/gofakeit/v7 v7.14.1
+	charm.land/bubbles/v2 v2.2.1
-	github.com/charmbracelet/bubbles v1.0.0
+	charm.land/bubbletea/v2 v2.0.10
-	github.com/charmbracelet/bubbletea v1.3.10
+	charm.land/glamour/v2 v2.0.1
-	github.com/charmbracelet/glamour v1.0.0
+	charm.land/lipgloss/v2 v2.0.6
-	github.com/charmbracelet/lipgloss v1.1.1-0.20250404203927-76690c660834
+	github.com/brianvoe/gofakeit/v7 v7.17.1
 	github.com/charmbracelet/x/term v0.2.2
-	github.com/dop251/goja v0.0.0-20260311135729-065cd970411c
+	github.com/dop251/goja v0.0.0-20260911104922-fabc3b8078ad
 	github.com/joho/godotenv v1.5.1
-	github.com/valyala/fasthttp v1.70.0
+	github.com/valyala/fasthttp v1.74.0
 	github.com/yuin/gopher-lua v1.1.2
 	go.aykhans.me/utils v1.0.7
-	go.yaml.in/yaml/v4 v4.0.0-rc.4
+	go.yaml.in/yaml/v4 v4.0.0-rc.6
-	golang.org/x/net v0.53.0
+	golang.org/x/net v0.59.0
 )
 
 require (
-	github.com/alecthomas/chroma/v2 v2.23.1 // indirect
+	github.com/alecthomas/chroma/v2 v2.27.0 // indirect
-	github.com/andybalholm/brotli v1.2.1 // indirect
-	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
 	github.com/aymerick/douceur v0.2.0 // indirect
 	github.com/charmbracelet/colorprofile v0.4.3 // indirect
 	github.com/charmbracelet/harmonica v0.2.0 // indirect
-	github.com/charmbracelet/x/ansi v0.11.6 // indirect
+	github.com/charmbracelet/ultraviolet v0.0.0-20260910203606-6c9e17dc7a16 // indirect
-	github.com/charmbracelet/x/cellbuf v0.0.15 // indirect
+	github.com/charmbracelet/x/ansi v0.11.8 // indirect
-	github.com/charmbracelet/x/exp/slice v0.0.0-20260329003944-7eda8903d971 // indirect
+	github.com/charmbracelet/x/exp/slice v0.0.0-20260906004030-3986e9119cf9 // indirect
+	github.com/charmbracelet/x/termios v0.1.1 // indirect
+	github.com/charmbracelet/x/windows v0.2.2 // indirect
 	github.com/clipperhouse/displaywidth v0.11.0 // indirect
 	github.com/clipperhouse/uax29/v2 v2.7.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
-	github.com/dlclark/regexp2 v1.11.5 // indirect
+	github.com/dlclark/regexp2/v2 v2.8.0 // indirect
-	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/go-sourcemap/sourcemap v2.1.4+incompatible // indirect
-	github.com/google/pprof v0.0.0-20260302011040-a15ffb7f9dcc // indirect
+	github.com/google/pprof v0.0.0-20260906184651-6331bc6350fe // indirect
 	github.com/gorilla/css v1.0.1 // indirect
-	github.com/klauspost/compress v1.18.5 // indirect
+	github.com/klauspost/compress v1.20.0 // indirect
-	github.com/lucasb-eyer/go-colorful v1.4.0 // indirect
+	github.com/lucasb-eyer/go-colorful v1.4.1 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-runewidth v0.0.30 // indirect
-	github.com/mattn/go-localereader v0.0.1 // indirect
-	github.com/mattn/go-runewidth v0.0.21 // indirect
 	github.com/microcosm-cc/bluemonday v1.0.27 // indirect
-	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
+	github.com/molecule-man/go-brrr v1.1.0 // indirect
 	github.com/muesli/cancelreader v0.2.2 // indirect
-	github.com/muesli/reflow v0.3.0 // indirect
-	github.com/muesli/termenv v0.16.0 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
-	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
+	github.com/xo/terminfo v1.0.0 // indirect
-	github.com/yuin/goldmark v1.8.2 // indirect
+	github.com/yuin/goldmark v1.8.6 // indirect
 	github.com/yuin/goldmark-emoji v1.0.6 // indirect
-	golang.org/x/sys v0.43.0 // indirect
+	golang.org/x/sync v0.23.0 // indirect
-	golang.org/x/term v0.42.0 // indirect
+	golang.org/x/sys v0.48.0 // indirect
-	golang.org/x/text v0.36.0 // indirect
+	golang.org/x/text v0.42.0 // indirect
 )

go.sum

@@ -1,125 +1,110 @@
-github.com/Masterminds/semver/v3 v3.2.1 h1:RN9w6+7QoMeJVGyfmbcgs28Br8cvmnucEXnY0rYXWg0=
+charm.land/bubbles/v2 v2.2.1 h1:Fq1+qm5hV6GkvzLQDhCBpXXE5tLgvh1PRriCLwSvIQU=
-github.com/Masterminds/semver/v3 v3.2.1/go.mod h1:qvl/7zhW3nngYb5+80sSMF+FG2BjYrf8m9wsX0PNOMQ=
+charm.land/bubbles/v2 v2.2.1/go.mod h1:wdMgn+sje1KNXdwFizIWjbf328fIUBxqEmJ/vYPo8yc=
+charm.land/bubbletea/v2 v2.0.10 h1:oolvo20VBpI0PfqE7iFjkZ1bx0WpmXGfnKz5Yldjq5o=
+charm.land/bubbletea/v2 v2.0.10/go.mod h1:QOatcnhOjYIfxzUSTz6raF7Ex4R/rIuHa3SnBdCCpMc=
+charm.land/glamour/v2 v2.0.1 h1:xl+r00A4aJWU0z8fgwKd9fQQ4rsphqGUzuEiXZP5n+c=
+charm.land/glamour/v2 v2.0.1/go.mod h1:jo9z8XqVKPeEFMVdvCRLGk++RyJ3CdUwgNr7EvXLw3k=
+charm.land/lipgloss/v2 v2.0.6 h1:EaGKeuA8FvF+v2BT5VmZd2LoYLaMZJXA5n34th8nCIQ=
+charm.land/lipgloss/v2 v2.0.6/go.mod h1:ipDDJNSGa1hlwDtSfW1s2/xR8Vdhbut4PXh2zEKZd0Q=
+github.com/Masterminds/semver/v3 v3.5.0 h1:kQceYJfbupGfZOKZQg0kou0DgAKhzDg2NZPAwZ/2OOE=
+github.com/Masterminds/semver/v3 v3.5.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
 github.com/alecthomas/assert/v2 v2.11.0 h1:2Q9r3ki8+JYXvGsDyBXwH3LcJ+WK5D0gc5E8vS6K3D0=
 github.com/alecthomas/assert/v2 v2.11.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
-github.com/alecthomas/chroma/v2 v2.23.1 h1:nv2AVZdTyClGbVQkIzlDm/rnhk1E9bU9nXwmZ/Vk/iY=
+github.com/alecthomas/chroma/v2 v2.27.0 h1:FodwmyOBgJULFYmDqibcp9pvfDLWdtPRh9v/r5BXYZs=
-github.com/alecthomas/chroma/v2 v2.23.1/go.mod h1:NqVhfBR0lte5Ouh3DcthuUCTUpDC9cxBOfyMbMQPs3o=
+github.com/alecthomas/chroma/v2 v2.27.0/go.mod h1:NjJ3ciIgrqBNeIkWZ4e46nseoLDslxU1LmfCoL+wcY8=
 github.com/alecthomas/repr v0.5.2 h1:SU73FTI9D1P5UNtvseffFSGmdNci/O6RsqzeXJtP0Qs=
 github.com/alecthomas/repr v0.5.2/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
-github.com/andybalholm/brotli v1.2.1 h1:R+f5xP285VArJDRgowrfb9DqL18yVK0gKAW/F+eTWro=
+github.com/aymanbagabas/go-udiff v0.4.1 h1:OEIrQ8maEeDBXQDoGCbbTTXYJMYRCRO1fnodZ12Gv5o=
-github.com/andybalholm/brotli v1.2.1/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/aymanbagabas/go-udiff v0.4.1/go.mod h1:0L9PGwj20lrtmEMeyw4WKJ/TMyDtvAoK9bf2u/mNo3w=
-github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
-github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
-github.com/aymanbagabas/go-udiff v0.3.1 h1:LV+qyBQ2pqe0u42ZsUEtPiCaUoqgA9gYRDs3vj1nolY=
-github.com/aymanbagabas/go-udiff v0.3.1/go.mod h1:G0fsKmG+P6ylD0r6N/KgQD/nWzgfnl8ZBcNLgcbrw8E=
 github.com/aymerick/douceur v0.2.0 h1:Mv+mAeH1Q+n9Fr+oyamOlAkUNPWPlA8PPGR0QAaYuPk=
 github.com/aymerick/douceur v0.2.0/go.mod h1:wlT5vV2O3h55X9m7iVYN0TBM0NH/MmbLnd30/FjWUq4=
-github.com/brianvoe/gofakeit/v7 v7.14.1 h1:a7fe3fonbj0cW3wgl5VwIKfZtiH9C3cLnwcIXWT7sow=
+github.com/brianvoe/gofakeit/v7 v7.17.1 h1:50FLBhTGVJQaj6ysRUu0it8wCdYO2uGM9VfuxI+csEc=
-github.com/brianvoe/gofakeit/v7 v7.14.1/go.mod h1:QXuPeBw164PJCzCUZVmgpgHJ3Llj49jSLVkKPMtxtxA=
+github.com/brianvoe/gofakeit/v7 v7.17.1/go.mod h1:QXuPeBw164PJCzCUZVmgpgHJ3Llj49jSLVkKPMtxtxA=
-github.com/charmbracelet/bubbles v1.0.0 h1:12J8/ak/uCZEMQ6KU7pcfwceyjLlWsDLAxB5fXonfvc=
-github.com/charmbracelet/bubbles v1.0.0/go.mod h1:9d/Zd5GdnauMI5ivUIVisuEm3ave1XwXtD1ckyV6r3E=
-github.com/charmbracelet/bubbletea v1.3.10 h1:otUDHWMMzQSB0Pkc87rm691KZ3SWa4KUlvF9nRvCICw=
-github.com/charmbracelet/bubbletea v1.3.10/go.mod h1:ORQfo0fk8U+po9VaNvnV95UPWA1BitP1E0N6xJPlHr4=
 github.com/charmbracelet/colorprofile v0.4.3 h1:QPa1IWkYI+AOB+fE+mg/5/4HRMZcaXex9t5KX76i20Q=
 github.com/charmbracelet/colorprofile v0.4.3/go.mod h1:/zT4BhpD5aGFpqQQqw7a+VtHCzu+zrQtt1zhMt9mR4Q=
-github.com/charmbracelet/glamour v1.0.0 h1:AWMLOVFHTsysl4WV8T8QgkQ0s/ZNZo7CiE4WKhk8l08=
-github.com/charmbracelet/glamour v1.0.0/go.mod h1:DSdohgOBkMr2ZQNhw4LZxSGpx3SvpeujNoXrQyH2hxo=
 github.com/charmbracelet/harmonica v0.2.0 h1:8NxJWRWg/bzKqqEaaeFNipOu77YR5t8aSwG4pgaUBiQ=
 github.com/charmbracelet/harmonica v0.2.0/go.mod h1:KSri/1RMQOZLbw7AHqgcBycp8pgJnQMYYT8QZRqZ1Ao=
-github.com/charmbracelet/lipgloss v1.1.1-0.20250404203927-76690c660834 h1:ZR7e0ro+SZZiIZD7msJyA+NjkCNNavuiPBLgerbOziE=
+github.com/charmbracelet/ultraviolet v0.0.0-20260910203606-6c9e17dc7a16 h1:/hSCZO1puetbGd2JikHKN0nAcb2mFevzxJElFoduhaw=
-github.com/charmbracelet/lipgloss v1.1.1-0.20250404203927-76690c660834/go.mod h1:aKC/t2arECF6rNOnaKaVU6y4t4ZeHQzqfxedE/VkVhA=
+github.com/charmbracelet/ultraviolet v0.0.0-20260910203606-6c9e17dc7a16/go.mod h1:JFvmQPZh3uAu7PpSZU91bcR0BrIy24HhW+0EsW1uGxE=
-github.com/charmbracelet/x/ansi v0.11.6 h1:GhV21SiDz/45W9AnV2R61xZMRri5NlLnl6CVF7ihZW8=
+github.com/charmbracelet/x/ansi v0.11.8 h1:JMFwp0CgDC2+jcOB162HH5k7I3FVbgFSMMYg7dSPBQQ=
-github.com/charmbracelet/x/ansi v0.11.6/go.mod h1:2JNYLgQUsyqaiLovhU2Rv/pb8r6ydXKS3NIttu3VGZQ=
+github.com/charmbracelet/x/ansi v0.11.8/go.mod h1:ZNN+3mXny/516oTQPLMPIBeSINvNJJQ8uQXDgbeJxY0=
-github.com/charmbracelet/x/cellbuf v0.0.15 h1:ur3pZy0o6z/R7EylET877CBxaiE1Sp1GMxoFPAIztPI=
+github.com/charmbracelet/x/exp/golden v0.0.0-20250806222409-83e3a29d542f h1:pk6gmGpCE7F3FcjaOEKYriCvpmIN4+6OS/RD0vm4uIA=
-github.com/charmbracelet/x/cellbuf v0.0.15/go.mod h1:J1YVbR7MUuEGIFPCaaZ96KDl5NoS0DAWkskup+mOY+Q=
+github.com/charmbracelet/x/exp/golden v0.0.0-20250806222409-83e3a29d542f/go.mod h1:IfZAMTHB6XkZSeXUqriemErjAWCCzT0LwjKFYCZyw0I=
-github.com/charmbracelet/x/exp/golden v0.0.0-20241011142426-46044092ad91 h1:payRxjMjKgx2PaCWLZ4p3ro9y97+TVLZNaRZgJwSVDQ=
+github.com/charmbracelet/x/exp/slice v0.0.0-20260906004030-3986e9119cf9 h1:zW96vcZ3zDetccerbN7sS/sCydOE/l/9S+C94pozsaU=
-github.com/charmbracelet/x/exp/golden v0.0.0-20241011142426-46044092ad91/go.mod h1:wDlXFlCrmJ8J+swcL/MnGUuYnqgQdW9rhSD61oNMb6U=
+github.com/charmbracelet/x/exp/slice v0.0.0-20260906004030-3986e9119cf9/go.mod h1:vqEfX6xzqW1pKKZUUiFOKg0OQ7bCh54Q2vR/tserrRA=
-github.com/charmbracelet/x/exp/slice v0.0.0-20260329003944-7eda8903d971 h1:wae/9jUCdhUiuyCcOzZZ+vJEB7uJx+IvtTnpCqcW1ZQ=
-github.com/charmbracelet/x/exp/slice v0.0.0-20260329003944-7eda8903d971/go.mod h1:vqEfX6xzqW1pKKZUUiFOKg0OQ7bCh54Q2vR/tserrRA=
 github.com/charmbracelet/x/term v0.2.2 h1:xVRT/S2ZcKdhhOuSP4t5cLi5o+JxklsoEObBSgfgZRk=
 github.com/charmbracelet/x/term v0.2.2/go.mod h1:kF8CY5RddLWrsgVwpw4kAa6TESp6EB5y3uxGLeCqzAI=
+github.com/charmbracelet/x/termios v0.1.1 h1:o3Q2bT8eqzGnGPOYheoYS8eEleT5ZVNYNy8JawjaNZY=
+github.com/charmbracelet/x/termios v0.1.1/go.mod h1:rB7fnv1TgOPOyyKRJ9o+AsTU/vK5WHJ2ivHeut/Pcwo=
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internal/config/cli.go

@@ -27,7 +27,9 @@ Flags:
     -c, -concurrency   uint       Number of concurrent requests (default %d)
     -r, -requests      uint       Number of total requests
     -d, -duration      time       Maximum duration for the test (e.g. 30s, 1m, 5h)
-    -q, -quiet         bool       Hide the progress bar and runtime logs (default %v)
+    -l, -log-level     string     Runtime log levels to emit, comma-separated (possible values: info, error) (default %s)
+    -w, -log-file      string     Write runtime logs to this file instead of the terminal/stderr
+    -p, -progress      string     Progress display (possible values: bar, none) (default '%v')
     -o, -output        string     Output format (possible values: table, json, yaml, none) (default '%v')
     -z, -dry-run       bool       Run without sending requests (default %v)
 
@@ -88,7 +90,9 @@ func (parser ConfigCLIParser) Parse() (*Config, error) {
 		concurrency  uint
 		requestCount uint64
 		duration     time.Duration
-		quiet        bool
+		logLevel     string
+		logFile      string
+		progress     string
 		output       string
 		dryRun       bool
 
@@ -127,8 +131,14 @@ func (parser ConfigCLIParser) Parse() (*Config, error) {
 		flagSet.DurationVar(&duration, "duration", 0, "Maximum duration for the test")
 		flagSet.DurationVar(&duration, "d", 0, "Maximum duration for the test")
 
-		flagSet.BoolVar(&quiet, "quiet", false, "Hide the progress bar and runtime logs")
+		flagSet.StringVar(&logLevel, "log-level", "", "Runtime log levels to emit, comma-separated (possible values: info, error)")
-		flagSet.BoolVar(&quiet, "q", false, "Hide the progress bar and runtime logs")
+		flagSet.StringVar(&logLevel, "l", "", "Runtime log levels to emit, comma-separated (possible values: info, error)")
+
+		flagSet.StringVar(&logFile, "log-file", "", "Write runtime logs to this file instead of the terminal/stderr")
+		flagSet.StringVar(&logFile, "w", "", "Write runtime logs to this file instead of the terminal/stderr")
+
+		flagSet.StringVar(&progress, "progress", "", "Progress display (possible values: bar, none)")
+		flagSet.StringVar(&progress, "p", "", "Progress display (possible values: bar, none)")
 
 		flagSet.StringVar(&output, "output", "", "Output format (possible values: table, json, yaml, none)")
 		flagSet.StringVar(&output, "o", "", "Output format (possible values: table, json, yaml, none)")
@@ -205,8 +215,12 @@ func (parser ConfigCLIParser) Parse() (*Config, error) {
 			config.Requests = new(requestCount)
 		case "duration", "d":
 			config.Duration = new(duration)
-		case "quiet", "q":
+		case "log-level", "l":
-			config.Quiet = new(quiet)
+			config.LogLevel = new(logLevel)
+		case "log-file", "w":
+			config.LogFile = new(logFile)
+		case "progress", "p":
+			config.Progress = new(ConfigProgressType(progress))
 		case "output", "o":
 			config.Output = new(ConfigOutputType(output))
 		case "dry-run", "z":
@@ -265,7 +279,8 @@ func (parser ConfigCLIParser) PrintHelp() {
 		cliUsageText+"\n",
 		Defaults.ShowConfig,
 		Defaults.Concurrency,
-		Defaults.Quiet,
+		Defaults.LogLevel,
+		Defaults.Progress,
 		Defaults.Output,
 		Defaults.DryRun,
 

internal/config/config.go

@@ -6,17 +6,18 @@ import (
 	"fmt"
 	"net/url"
 	"os"
+	"path/filepath"
 	"slices"
 	"strconv"
 	"strings"
 	"time"
 
-	"github.com/charmbracelet/bubbles/viewport"
+	"charm.land/bubbles/v2/viewport"
-	tea "github.com/charmbracelet/bubbletea"
+	tea "charm.land/bubbletea/v2"
-	"github.com/charmbracelet/glamour"
+	"charm.land/glamour/v2"
-	"github.com/charmbracelet/glamour/styles"
+	"charm.land/glamour/v2/styles"
-	"github.com/charmbracelet/lipgloss"
+	"charm.land/lipgloss/v2"
-	"github.com/charmbracelet/x/term"
+	"go.aykhans.me/sarin/internal/sarin"
 	"go.aykhans.me/sarin/internal/script"
 	"go.aykhans.me/sarin/internal/types"
 	"go.aykhans.me/sarin/internal/version"
@@ -31,25 +32,28 @@ var Defaults = struct {
 	RequestTimeout time.Duration
 	Concurrency    uint
 	ShowConfig     bool
-	Quiet          bool
+	Progress       ConfigProgressType
 	Insecure       bool
 	Output         ConfigOutputType
 	DryRun         bool
+	LogLevel       string
 }{
 	UserAgent:      "Sarin/" + version.Version,
 	Method:         "GET",
 	RequestTimeout: time.Second * 10,
 	Concurrency:    1,
 	ShowConfig:     false,
-	Quiet:          false,
+	Progress:       ConfigProgressTypeBar,
 	Insecure:       false,
 	Output:         ConfigOutputTypeTable,
 	DryRun:         false,
+	LogLevel:       "error",
 }
 
 var (
 	ValidProxySchemes      = []string{"http", "https", "socks5", "socks5h"}
 	ValidRequestURLSchemes = []string{"http", "https"}
+	ValidLogLevels         = []string{"info", "error"}
 )
 
 var (
@@ -70,27 +74,36 @@ var (
 	ConfigOutputTypeNone  ConfigOutputType = "none"
 )
 
+type ConfigProgressType string
+
+var (
+	ConfigProgressTypeBar  ConfigProgressType = "bar"
+	ConfigProgressTypeNone ConfigProgressType = "none"
+)
+
 type Config struct {
-	ShowConfig  *bool              `yaml:"showConfig,omitempty"`
+	ShowConfig  *bool               `yaml:"showConfig,omitempty"`
-	Files       []types.ConfigFile `yaml:"files,omitempty"`
+	Files       []types.ConfigFile  `yaml:"files,omitempty"`
-	Methods     []string           `yaml:"methods,omitempty"`
+	Methods     []string            `yaml:"methods,omitempty"`
-	URL         *url.URL           `yaml:"url,omitempty"`
+	URL         *url.URL            `yaml:"url,omitempty"`
-	Timeout     *time.Duration     `yaml:"timeout,omitempty"`
+	Timeout     *time.Duration      `yaml:"timeout,omitempty"`
-	Concurrency *uint              `yaml:"concurrency,omitempty"`
+	Concurrency *uint               `yaml:"concurrency,omitempty"`
-	Requests    *uint64            `yaml:"requests,omitempty"`
+	Requests    *uint64             `yaml:"requests,omitempty"`
-	Duration    *time.Duration     `yaml:"duration,omitempty"`
+	Duration    *time.Duration      `yaml:"duration,omitempty"`
-	Quiet       *bool              `yaml:"quiet,omitempty"`
+	Progress    *ConfigProgressType `yaml:"progress,omitempty"`
-	Output      *ConfigOutputType  `yaml:"output,omitempty"`
+	Output      *ConfigOutputType   `yaml:"output,omitempty"`
-	Insecure    *bool              `yaml:"insecure,omitempty"`
+	Insecure    *bool               `yaml:"insecure,omitempty"`
-	DryRun      *bool              `yaml:"dryRun,omitempty"`
+	DryRun      *bool               `yaml:"dryRun,omitempty"`
-	Params      types.Params       `yaml:"params,omitempty"`
+	Params      types.Params        `yaml:"params,omitempty"`
-	Headers     types.Headers      `yaml:"headers,omitempty"`
+	Headers     types.Headers       `yaml:"headers,omitempty"`
-	Cookies     types.Cookies      `yaml:"cookies,omitempty"`
+	Cookies     types.Cookies       `yaml:"cookies,omitempty"`
-	Bodies      []string           `yaml:"bodies,omitempty"`
+	Bodies      []string            `yaml:"bodies,omitempty"`
-	Proxies     types.Proxies      `yaml:"proxies,omitempty"`
+	Proxies     types.Proxies       `yaml:"proxies,omitempty"`
-	Values      []string           `yaml:"values,omitempty"`
+	Values      []string            `yaml:"values,omitempty"`
-	Lua         []string           `yaml:"lua,omitempty"`
+	Lua         []string            `yaml:"lua,omitempty"`
-	Js          []string           `yaml:"js,omitempty"`
+	Js          []string            `yaml:"js,omitempty"`
+	LogLevel    *string             `yaml:"logLevel,omitempty"`
+	LogFile     *string             `yaml:"logFile,omitempty"`
 }
 
 func (config Config) MarshalYAML() (any, error) {
@@ -173,8 +186,8 @@ func (config Config) MarshalYAML() (any, error) {
 	if config.Duration != nil {
 		addField(content, "duration", toNode(*config.Duration), "")
 	}
-	if config.Quiet != nil {
+	if config.Progress != nil {
-		addField(content, "quiet", toNode(*config.Quiet), "")
+		addField(content, "progress", toNode(string(*config.Progress)), "")
 	}
 	if config.Output != nil {
 		addField(content, "output", toNode(string(*config.Output)), "")
@@ -221,6 +234,13 @@ func (config Config) MarshalYAML() (any, error) {
 	addStringSlice(content, "values", config.Values, false)
 	addStringSlice(content, "lua", config.Lua, false)
 	addStringSlice(content, "js", config.Js, false)
+	if config.LogLevel != nil {
+		addField(content, "logLevel", toNode(*config.LogLevel), "")
+	}
+
+	if config.LogFile != nil {
+		addField(content, "logFile", toNode(*config.LogFile), "")
+	}
 
 	return root, nil
 }
@@ -228,12 +248,12 @@ func (config Config) MarshalYAML() (any, error) {
 func (config Config) Print() bool {
 	configYAML, err := yaml.Marshal(config)
 	if err != nil {
-		fmt.Fprintln(os.Stderr, StyleRed.Render("Error marshaling config to yaml: "+err.Error()))
+		fmt.Fprint(os.Stderr, lipgloss.Sprintln(StyleRed.Render("Error marshaling config to yaml: "+err.Error())))
 		os.Exit(1)
 	}
 
 	// Pipe mode: output raw content directly
-	if !term.IsTerminal(os.Stdout.Fd()) {
+	if !sarin.IsInteractiveTerminal(os.Stdout.Fd()) {
 		fmt.Println(string(configYAML))
 		os.Exit(0)
 	}
@@ -247,25 +267,23 @@ func (config Config) Print() bool {
 		glamour.WithWordWrap(0),
 	)
 	if err != nil {
-		fmt.Fprintln(os.Stderr, StyleRed.Render(err.Error()))
+		fmt.Fprint(os.Stderr, lipgloss.Sprintln(StyleRed.Render(err.Error())))
 		os.Exit(1)
 	}
 
 	content, err := renderer.Render("```yaml\n" + string(configYAML) + "```")
 	if err != nil {
-		fmt.Fprintln(os.Stderr, StyleRed.Render(err.Error()))
+		fmt.Fprint(os.Stderr, lipgloss.Sprintln(StyleRed.Render(err.Error())))
 		os.Exit(1)
 	}
 
 	p := tea.NewProgram(
 		printConfigModel{content: strings.Trim(content, "\n"), rawContent: configYAML},
-		tea.WithAltScreen(),
-		tea.WithMouseCellMotion(),
 	)
 
 	m, err := p.Run()
 	if err != nil {
-		fmt.Fprintln(os.Stderr, StyleRed.Render(err.Error()))
+		fmt.Fprint(os.Stderr, lipgloss.Sprintln(StyleRed.Render(err.Error())))
 		os.Exit(1)
 	}
 
@@ -295,8 +313,8 @@ func (config *Config) Merge(newConfig *Config) {
 	if newConfig.ShowConfig != nil {
 		config.ShowConfig = newConfig.ShowConfig
 	}
-	if newConfig.Quiet != nil {
+	if newConfig.Progress != nil {
-		config.Quiet = newConfig.Quiet
+		config.Progress = newConfig.Progress
 	}
 	if newConfig.Output != nil {
 		config.Output = newConfig.Output
@@ -331,6 +349,12 @@ func (config *Config) Merge(newConfig *Config) {
 	if len(newConfig.Js) != 0 {
 		config.Js = append(config.Js, newConfig.Js...)
 	}
+	if newConfig.LogLevel != nil {
+		config.LogLevel = newConfig.LogLevel
+	}
+	if newConfig.LogFile != nil {
+		config.LogFile = newConfig.LogFile
+	}
 }
 
 func (config *Config) SetDefaults() {
@@ -361,8 +385,8 @@ func (config *Config) SetDefaults() {
 	if config.ShowConfig == nil {
 		config.ShowConfig = new(Defaults.ShowConfig)
 	}
-	if config.Quiet == nil {
+	if config.Progress == nil {
-		config.Quiet = new(Defaults.Quiet)
+		config.Progress = new(Defaults.Progress)
 	}
 	if config.Insecure == nil {
 		config.Insecure = new(Defaults.Insecure)
@@ -377,6 +401,14 @@ func (config *Config) SetDefaults() {
 	if config.Output == nil {
 		config.Output = new(Defaults.Output)
 	}
+
+	if config.LogLevel == nil {
+		config.LogLevel = new(Defaults.LogLevel)
+	}
+
+	if config.LogFile == nil {
+		config.LogFile = new("")
+	}
 }
 
 // Validate validates the config fields.
@@ -426,8 +458,21 @@ func (config Config) Validate() error {
 		validationErrors = append(validationErrors, types.NewFieldValidationError("ShowConfig", "", errors.New("showConfig field is required")))
 	}
 
-	if config.Quiet == nil {
+	if config.Progress == nil {
-		validationErrors = append(validationErrors, types.NewFieldValidationError("Quiet", "", errors.New("quiet field is required")))
+		validationErrors = append(validationErrors, types.NewFieldValidationError("Progress", "", errors.New("progress field is required")))
+	} else {
+		switch *config.Progress {
+		case ConfigProgressTypeBar, ConfigProgressTypeNone:
+		default:
+			validationErrors = append(
+				validationErrors,
+				types.NewFieldValidationError(
+					"Progress",
+					string(*config.Progress),
+					fmt.Errorf("progress must be one of: %s, %s", ConfigProgressTypeBar, ConfigProgressTypeNone),
+				),
+			)
+		}
 	}
 
 	if config.Output == nil {
@@ -460,6 +505,36 @@ func (config Config) Validate() error {
 		validationErrors = append(validationErrors, types.NewFieldValidationError("DryRun", "", errors.New("dryRun field is required")))
 	}
 
+	if config.LogLevel != nil {
+		for i, level := range sarin.SplitLogLevels(*config.LogLevel) {
+			if !slices.Contains(ValidLogLevels, level) {
+				validationErrors = append(
+					validationErrors,
+					types.NewFieldValidationError(
+						fmt.Sprintf("LogLevel[%d]", i),
+						level,
+						fmt.Errorf("log level must be one of: %s", strings.Join(ValidLogLevels, ", ")),
+					),
+				)
+			}
+		}
+	}
+
+	if config.LogFile != nil && *config.LogFile != "" {
+		dir := filepath.Dir(*config.LogFile)
+		if info, err := os.Stat(dir); err != nil {
+			validationErrors = append(
+				validationErrors,
+				types.NewFieldValidationError("LogFile", *config.LogFile, fmt.Errorf("parent directory %q is not accessible", dir)),
+			)
+		} else if !info.IsDir() {
+			validationErrors = append(
+				validationErrors,
+				types.NewFieldValidationError("LogFile", *config.LogFile, fmt.Errorf("parent path %q is not a directory", dir)),
+			)
+		}
+	}
+
 	for i, proxy := range config.Proxies {
 		if !slices.Contains(ValidProxySchemes, proxy.Scheme) {
 			validationErrors = append(
@@ -538,11 +613,11 @@ func ReadAllConfigs() *Config {
 	_ = utilsErr.MustHandle(err,
 		utilsErr.OnType(func(err types.CLIUnexpectedArgsError) error {
 			cliParser.PrintHelp()
-			fmt.Fprintln(os.Stderr,
+			fmt.Fprint(os.Stderr, lipgloss.Sprintln(
 				StyleYellow.Render(
 					"\nUnexpected CLI arguments provided: ",
 				)+strings.Join(err.Args, ", "),
-			)
+			))
 			os.Exit(1)
 			return nil
 		}),
@@ -560,20 +635,20 @@ func ReadAllConfigs() *Config {
 		_ = utilsErr.MustHandle(err,
 			utilsErr.OnType(func(err types.ConfigFileReadError) error {
 				cliParser.PrintHelp()
-				fmt.Fprintln(os.Stderr,
+				fmt.Fprint(os.Stderr, lipgloss.Sprintln(
 					StyleYellow.Render(
 						fmt.Sprintf("\nFailed to read config file (%s): ", configFile.Path())+err.Error(),
 					),
-				)
+				))
 				os.Exit(1)
 				return nil
 			}),
 			utilsErr.OnType(func(err types.UnmarshalError) error {
-				fmt.Fprintln(os.Stderr,
+				fmt.Fprint(os.Stderr, lipgloss.Sprintln(
 					StyleYellow.Render(
 						fmt.Sprintf("\nFailed to parse config file (%s): ", configFile.Path())+err.Error(),
 					),
-				)
+				))
 				os.Exit(1)
 				return nil
 			}),
@@ -676,13 +751,13 @@ func validateScriptSource(script string) error {
 func printParseErrors(parserName string, errors ...types.FieldParseError) {
 	for _, fieldErr := range errors {
 		if fieldErr.Value == "" {
-			fmt.Fprintln(os.Stderr,
+			fmt.Fprint(os.Stderr, lipgloss.Sprintln(
 				StyleYellow.Render(fmt.Sprintf("[%s] Field '%s': ", parserName, fieldErr.Field))+fieldErr.Err.Error(),
-			)
+			))
 		} else {
-			fmt.Fprintln(os.Stderr,
+			fmt.Fprint(os.Stderr, lipgloss.Sprintln(
 				StyleYellow.Render(fmt.Sprintf("[%s] Field '%s' (%s): ", parserName, fieldErr.Field, fieldErr.Value))+fieldErr.Err.Error(),
-			)
+			))
 		}
 	}
 }
@@ -723,7 +798,7 @@ func (m printConfigModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	var cmd tea.Cmd
 
 	switch msg := msg.(type) {
-	case tea.KeyMsg:
+	case tea.KeyPressMsg:
 		switch msg.String() {
 		case "ctrl+c", "esc":
 			return m, tea.Quit
@@ -746,13 +821,22 @@ func (m printConfigModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	return m, cmd
 }
 
-func (m printConfigModel) View() string {
+func (m printConfigModel) View() tea.View {
+	// AltScreen and MouseMode were program options in bubbletea v1; in v2 they
+	// are view properties, so every return path has to declare them.
+	newView := func(s string) tea.View {
+		v := tea.NewView(s)
+		v.AltScreen = true
+		v.MouseMode = tea.MouseModeCellMotion
+		return v
+	}
+
 	if !m.ready {
-		return "\n  Initializing..."
+		return newView("\n  Initializing...")
 	}
 
 	content := lipgloss.JoinHorizontal(lipgloss.Top, m.viewport.View(), m.scrollbar())
-	return fmt.Sprintf("%s\n%s\n%s", m.headerView(), content, m.footerView())
+	return newView(fmt.Sprintf("%s\n%s\n%s", m.headerView(), content, m.footerView()))
 }
 
 func (m *printConfigModel) saveContent() (printConfigModel, tea.Cmd) {
@@ -772,12 +856,13 @@ func (m *printConfigModel) handleResize(msg tea.WindowSizeMsg) {
 	width := msg.Width - scrollbarWidth
 
 	if !m.ready {
-		m.viewport = viewport.New(width, height)
+		m.viewport = viewport.New(viewport.WithWidth(width), viewport.WithHeight(height))
+		m.viewport.SetHorizontalStep(0)
 		m.viewport.SetContent(m.contentWithLineNumbers())
 		m.ready = true
 	} else {
-		m.viewport.Width = width
+		m.viewport.SetWidth(width)
-		m.viewport.Height = height
+		m.viewport.SetHeight(height)
 	}
 }
 
@@ -792,12 +877,12 @@ func (m printConfigModel) headerView() string {
 			printConfigKeyStyle.Render("ESC") + printConfigDescStyle.Render(" exit")
 		title = printConfigHelpStyle.Render(help)
 	}
-	line := strings.Repeat("─", max(0, m.viewport.Width+scrollbarWidth-lipgloss.Width(title)))
+	line := strings.Repeat("─", max(0, m.viewport.Width()+scrollbarWidth-lipgloss.Width(title)))
 	return lipgloss.JoinHorizontal(lipgloss.Center, title, line)
 }
 
 func (m printConfigModel) footerView() string {
-	return strings.Repeat("─", m.viewport.Width+scrollbarWidth)
+	return strings.Repeat("─", m.viewport.Width()+scrollbarWidth)
 }
 
 func (m printConfigModel) contentWithLineNumbers() string {
@@ -819,7 +904,7 @@ func (m printConfigModel) contentWithLineNumbers() string {
 }
 
 func (m printConfigModel) scrollbar() string {
-	height := m.viewport.Height
+	height := m.viewport.Height()
 	trackHeight := height - scrollbarBottomSpace
 	totalLines := m.viewport.TotalLineCount()
 

internal/config/env.go

@@ -49,74 +49,6 @@ func (parser ConfigENVParser) Parse() (*Config, error) {
 		config.Files = append(config.Files, *types.ParseConfigFile(configFile))
 	}
 
-	if quiet := parser.getEnv("QUIET"); quiet != "" {
-		quietParsed, err := utilsParse.ParseString[bool](quiet)
-		if err != nil {
-			fieldParseErrors = append(
-				fieldParseErrors,
-				types.NewFieldParseError(
-					parser.getFullEnvName("QUIET"),
-					quiet,
-					errors.New("invalid value for boolean, expected 'true' or 'false'"),
-				),
-			)
-		} else {
-			config.Quiet = &quietParsed
-		}
-	}
-
-	if output := parser.getEnv("OUTPUT"); output != "" {
-		config.Output = new(ConfigOutputType(output))
-	}
-
-	if insecure := parser.getEnv("INSECURE"); insecure != "" {
-		insecureParsed, err := utilsParse.ParseString[bool](insecure)
-		if err != nil {
-			fieldParseErrors = append(
-				fieldParseErrors,
-				types.NewFieldParseError(
-					parser.getFullEnvName("INSECURE"),
-					insecure,
-					errors.New("invalid value for boolean, expected 'true' or 'false'"),
-				),
-			)
-		} else {
-			config.Insecure = &insecureParsed
-		}
-	}
-
-	if dryRun := parser.getEnv("DRY_RUN"); dryRun != "" {
-		dryRunParsed, err := utilsParse.ParseString[bool](dryRun)
-		if err != nil {
-			fieldParseErrors = append(
-				fieldParseErrors,
-				types.NewFieldParseError(
-					parser.getFullEnvName("DRY_RUN"),
-					dryRun,
-					errors.New("invalid value for boolean, expected 'true' or 'false'"),
-				),
-			)
-		} else {
-			config.DryRun = &dryRunParsed
-		}
-	}
-
-	if method := parser.getEnv("METHOD"); method != "" {
-		config.Methods = []string{method}
-	}
-
-	if urlEnv := parser.getEnv("URL"); urlEnv != "" {
-		urlEnvParsed, err := url.Parse(urlEnv)
-		if err != nil {
-			fieldParseErrors = append(
-				fieldParseErrors,
-				types.NewFieldParseError(parser.getFullEnvName("URL"), urlEnv, err),
-			)
-		} else {
-			config.URL = urlEnvParsed
-		}
-	}
-
 	if concurrency := parser.getEnv("CONCURRENCY"); concurrency != "" {
 		concurrencyParsed, err := utilsParse.ParseString[uint](concurrency)
 		if err != nil {
@@ -165,22 +97,58 @@ func (parser ConfigENVParser) Parse() (*Config, error) {
 		}
 	}
 
-	if timeout := parser.getEnv("TIMEOUT"); timeout != "" {
+	if logLevel := parser.getEnv("LOG_LEVEL"); logLevel != "" {
-		timeoutParsed, err := utilsParse.ParseString[time.Duration](timeout)
+		config.LogLevel = new(logLevel)
+	}
+
+	if logFile := parser.getEnv("LOG_FILE"); logFile != "" {
+		config.LogFile = new(logFile)
+	}
+
+	if progress := parser.getEnv("PROGRESS"); progress != "" {
+		config.Progress = new(ConfigProgressType(progress))
+	}
+
+	if output := parser.getEnv("OUTPUT"); output != "" {
+		config.Output = new(ConfigOutputType(output))
+	}
+
+	if dryRun := parser.getEnv("DRY_RUN"); dryRun != "" {
+		dryRunParsed, err := utilsParse.ParseString[bool](dryRun)
 		if err != nil {
 			fieldParseErrors = append(
 				fieldParseErrors,
 				types.NewFieldParseError(
-					parser.getFullEnvName("TIMEOUT"),
+					parser.getFullEnvName("DRY_RUN"),
-					timeout,
+					dryRun,
-					errors.New("invalid value for duration, expected a duration string (e.g., '10s', '1h30m')"),
+					errors.New("invalid value for boolean, expected 'true' or 'false'"),
 				),
 			)
 		} else {
-			config.Timeout = &timeoutParsed
+			config.DryRun = &dryRunParsed
 		}
 	}
 
+	if urlEnv := parser.getEnv("URL"); urlEnv != "" {
+		urlEnvParsed, err := url.Parse(urlEnv)
+		if err != nil {
+			fieldParseErrors = append(
+				fieldParseErrors,
+				types.NewFieldParseError(parser.getFullEnvName("URL"), urlEnv, err),
+			)
+		} else {
+			config.URL = urlEnvParsed
+		}
+	}
+
+	if method := parser.getEnv("METHOD"); method != "" {
+		config.Methods = []string{method}
+	}
+
+	if body := parser.getEnv("BODY"); body != "" {
+		config.Bodies = []string{body}
+	}
+
 	if param := parser.getEnv("PARAM"); param != "" {
 		config.Params.Parse(param)
 	}
@@ -193,10 +161,6 @@ func (parser ConfigENVParser) Parse() (*Config, error) {
 		config.Cookies.Parse(cookie)
 	}
 
-	if body := parser.getEnv("BODY"); body != "" {
-		config.Bodies = []string{body}
-	}
-
 	if proxy := parser.getEnv("PROXY"); proxy != "" {
 		err := config.Proxies.Parse(proxy)
 		if err != nil {
@@ -215,6 +179,38 @@ func (parser ConfigENVParser) Parse() (*Config, error) {
 		config.Values = []string{values}
 	}
 
+	if timeout := parser.getEnv("TIMEOUT"); timeout != "" {
+		timeoutParsed, err := utilsParse.ParseString[time.Duration](timeout)
+		if err != nil {
+			fieldParseErrors = append(
+				fieldParseErrors,
+				types.NewFieldParseError(
+					parser.getFullEnvName("TIMEOUT"),
+					timeout,
+					errors.New("invalid value for duration, expected a duration string (e.g., '10s', '1h30m')"),
+				),
+			)
+		} else {
+			config.Timeout = &timeoutParsed
+		}
+	}
+
+	if insecure := parser.getEnv("INSECURE"); insecure != "" {
+		insecureParsed, err := utilsParse.ParseString[bool](insecure)
+		if err != nil {
+			fieldParseErrors = append(
+				fieldParseErrors,
+				types.NewFieldParseError(
+					parser.getFullEnvName("INSECURE"),
+					insecure,
+					errors.New("invalid value for boolean, expected 'true' or 'false'"),
+				),
+			)
+		} else {
+			config.Insecure = &insecureParsed
+		}
+	}
+
 	if lua := parser.getEnv("LUA"); lua != "" {
 		config.Lua = []string{lua}
 	}

internal/config/file.go

@@ -192,24 +192,26 @@ func (kv *keyValuesField) unmarshalMapping(node *yaml.Node) error {
 }
 
 type configYAML struct {
+	ShowConfig   *bool              `yaml:"showConfig"`
 	ConfigFiles  stringOrSliceField `yaml:"configFile"`
-	Method       stringOrSliceField `yaml:"method"`
-	URL          *string            `yaml:"url"`
-	Timeout      *time.Duration     `yaml:"timeout"`
 	Concurrency  *uint              `yaml:"concurrency"`
 	RequestCount *uint64            `yaml:"requests"`
 	Duration     *time.Duration     `yaml:"duration"`
-	Quiet        *bool              `yaml:"quiet"`
+	LogLevel     *string            `yaml:"logLevel"`
+	LogFile      *string            `yaml:"logFile"`
+	Progress     *string            `yaml:"progress"`
 	Output       *string            `yaml:"output"`
-	Insecure     *bool              `yaml:"insecure"`
-	ShowConfig   *bool              `yaml:"showConfig"`
 	DryRun       *bool              `yaml:"dryRun"`
+	URL          *string            `yaml:"url"`
+	Method       stringOrSliceField `yaml:"method"`
+	Bodies       stringOrSliceField `yaml:"body"`
 	Params       keyValuesField     `yaml:"params"`
 	Headers      keyValuesField     `yaml:"headers"`
 	Cookies      keyValuesField     `yaml:"cookies"`
-	Bodies       stringOrSliceField `yaml:"body"`
 	Proxies      stringOrSliceField `yaml:"proxy"`
 	Values       stringOrSliceField `yaml:"values"`
+	Timeout      *time.Duration     `yaml:"timeout"`
+	Insecure     *bool              `yaml:"insecure"`
 	Lua          stringOrSliceField `yaml:"lua"`
 	Js           stringOrSliceField `yaml:"js"`
 }
@@ -231,33 +233,7 @@ func (parser ConfigFileParser) ParseYAML(data []byte) (*Config, error) {
 
 	var fieldParseErrors []types.FieldParseError
 
-	config.Methods = append(config.Methods, parsedData.Method...)
-	config.Timeout = parsedData.Timeout
-	config.Concurrency = parsedData.Concurrency
-	config.Requests = parsedData.RequestCount
-	config.Duration = parsedData.Duration
 	config.ShowConfig = parsedData.ShowConfig
-	config.Quiet = parsedData.Quiet
-
-	if parsedData.Output != nil {
-		config.Output = new(ConfigOutputType(*parsedData.Output))
-	}
-
-	config.Insecure = parsedData.Insecure
-	config.DryRun = parsedData.DryRun
-	for _, kv := range parsedData.Params {
-		config.Params = append(config.Params, types.Param(kv))
-	}
-	for _, kv := range parsedData.Headers {
-		config.Headers = append(config.Headers, types.Header(kv))
-	}
-	for _, kv := range parsedData.Cookies {
-		config.Cookies = append(config.Cookies, types.Cookie(kv))
-	}
-	config.Bodies = append(config.Bodies, parsedData.Bodies...)
-	config.Values = append(config.Values, parsedData.Values...)
-	config.Lua = append(config.Lua, parsedData.Lua...)
-	config.Js = append(config.Js, parsedData.Js...)
 
 	if len(parsedData.ConfigFiles) > 0 {
 		for _, configFile := range parsedData.ConfigFiles {
@@ -265,6 +241,22 @@ func (parser ConfigFileParser) ParseYAML(data []byte) (*Config, error) {
 		}
 	}
 
+	config.Concurrency = parsedData.Concurrency
+	config.Requests = parsedData.RequestCount
+	config.Duration = parsedData.Duration
+	config.LogLevel = parsedData.LogLevel
+	config.LogFile = parsedData.LogFile
+
+	if parsedData.Progress != nil {
+		config.Progress = new(ConfigProgressType(*parsedData.Progress))
+	}
+
+	if parsedData.Output != nil {
+		config.Output = new(ConfigOutputType(*parsedData.Output))
+	}
+
+	config.DryRun = parsedData.DryRun
+
 	if parsedData.URL != nil {
 		urlParsed, err := url.Parse(*parsedData.URL)
 		if err != nil {
@@ -274,6 +266,18 @@ func (parser ConfigFileParser) ParseYAML(data []byte) (*Config, error) {
 		}
 	}
 
+	config.Methods = append(config.Methods, parsedData.Method...)
+	config.Bodies = append(config.Bodies, parsedData.Bodies...)
+	for _, kv := range parsedData.Params {
+		config.Params = append(config.Params, types.Param(kv))
+	}
+	for _, kv := range parsedData.Headers {
+		config.Headers = append(config.Headers, types.Header(kv))
+	}
+	for _, kv := range parsedData.Cookies {
+		config.Cookies = append(config.Cookies, types.Cookie(kv))
+	}
+
 	for i, proxy := range parsedData.Proxies {
 		err := config.Proxies.Parse(proxy)
 		if err != nil {
@@ -284,6 +288,12 @@ func (parser ConfigFileParser) ParseYAML(data []byte) (*Config, error) {
 		}
 	}
 
+	config.Values = append(config.Values, parsedData.Values...)
+	config.Timeout = parsedData.Timeout
+	config.Insecure = parsedData.Insecure
+	config.Lua = append(config.Lua, parsedData.Lua...)
+	config.Js = append(config.Js, parsedData.Js...)
+
 	if len(fieldParseErrors) > 0 {
 		return nil, types.NewFieldParseErrors(fieldParseErrors)
 	}

internal/sarin/request.go

@@ -56,9 +56,9 @@ func NewRequestGenerator(
 
 	pathGenerator, isPathGeneratorDynamic := createTemplateFunc(requestURL.Path, lazyTemplateRoot)
 	methodGenerator, isMethodGeneratorDynamic := NewMethodGeneratorFunc(localRand, methods, lazyTemplateRoot)
-	paramsGenerator, isParamsGeneratorDynamic := NewParamsGeneratorFunc(localRand, params, lazyTemplateRoot)
+	paramsGenerator, isParamsGeneratorDynamic, paramKeysAreStatic := NewParamsGeneratorFunc(localRand, params, lazyTemplateRoot)
-	headersGenerator, isHeadersGeneratorDynamic := NewHeadersGeneratorFunc(localRand, headers, lazyTemplateRoot)
+	headersGenerator, isHeadersGeneratorDynamic, headerKeysAreStatic := NewHeadersGeneratorFunc(localRand, headers, lazyTemplateRoot)
-	cookiesGenerator, isCookiesGeneratorDynamic := NewCookiesGeneratorFunc(localRand, cookies, lazyTemplateRoot)
+	cookiesGenerator, isCookiesGeneratorDynamic, cookieKeysAreStatic := NewCookiesGeneratorFunc(localRand, cookies, lazyTemplateRoot)
 
 	bodyTemplateFuncMapData := &BodyTemplateFuncMapData{}
 	var bodyTemplateRoot *template.Template
@@ -83,13 +83,26 @@ func NewRequestGenerator(
 		Cookies: make(map[string][]string),
 	}
 
+	// When a map's key set is fixed, every request refills exactly the same keys, so
+	// the value slices can be truncated and reused instead of being reallocated after
+	// a clear(). Scripts are excluded: they may swap the maps out or add keys of their
+	// own, and they would observe a leftover empty slice where a key used to be absent.
+	reuseParamSlices := paramKeysAreStatic && !hasScripts
+	reuseHeaderSlices := headerKeysAreStatic && !hasScripts
+	reuseCookieSlices := cookieKeysAreStatic && !hasScripts
+
 	var (
 		data valuesData
 		path string
 		err  error
 	)
 	return func(req *fasthttp.Request) error {
-			resetRequestData(reqData)
+			resetStringSliceMap(reqData.Headers, reuseHeaderSlices)
+			resetStringSliceMap(reqData.Params, reuseParamSlices)
+			resetStringSliceMap(reqData.Cookies, reuseCookieSlices)
+			reqData.Method = ""
+			reqData.Path = ""
+			reqData.Body = ""
 
 			data, err = valuesGenerator()
 			if err != nil {
@@ -143,20 +156,24 @@ func NewRequestGenerator(
 			hasScripts
 }
 
-func resetRequestData(reqData *script.RequestData) {
+// resetStringSliceMap empties m for the next render. With reuse it truncates the
-	reqData.Method = ""
+// value slices in place so the following appends land in the existing backing
-	reqData.Path = ""
+// arrays, without it the map is cleared so no stale key can survive.
-	reqData.Body = ""
+func resetStringSliceMap(m map[string][]string, reuse bool) {
-	clear(reqData.Headers)
+	if !reuse {
-	clear(reqData.Params)
+		clear(m)
-	clear(reqData.Cookies)
+		return
+	}
+	for k, v := range m {
+		m[k] = v[:0]
+	}
 }
 
 func applyRequestDataToFastHTTP(reqData *script.RequestData, req *fasthttp.Request, host, scheme string) {
 	req.Header.SetHost(host)
 	req.SetRequestURI(reqData.Path)
 	req.Header.SetMethod(reqData.Method)
-	req.SetBody([]byte(reqData.Body))
+	req.SetBodyString(reqData.Body)
 
 	for k, values := range reqData.Headers {
 		for _, v := range values {
@@ -164,20 +181,28 @@ func applyRequestDataToFastHTTP(reqData *script.RequestData, req *fasthttp.Reque
 		}
 	}
 
-	for k, values := range reqData.Params {
+	if len(reqData.Params) > 0 {
-		for _, v := range values {
+		args := req.URI().QueryArgs()
-			req.URI().QueryArgs().Add(k, v)
+		for k, values := range reqData.Params {
+			for _, v := range values {
+				args.Add(k, v)
+			}
 		}
 	}
 
 	if len(reqData.Cookies) > 0 {
-		cookieStrings := make([]string, 0, len(reqData.Cookies))
+		var sb strings.Builder
 		for k, values := range reqData.Cookies {
 			for _, v := range values {
-				cookieStrings = append(cookieStrings, k+"="+v)
+				if sb.Len() > 0 {
+					sb.WriteString("; ")
+				}
+				sb.WriteString(k)
+				sb.WriteByte('=')
+				sb.WriteString(v)
 			}
 		}
-		req.Header.Add("Cookie", strings.Join(cookieStrings, "; "))
+		req.Header.Add("Cookie", sb.String())
 	}
 
 	if scheme == "https" {
@@ -221,8 +246,8 @@ func NewBodyGeneratorFunc(localRand *rand.Rand, bodies []string, lazyRoot func()
 	}, isDynamic
 }
 
-func NewParamsGeneratorFunc(localRand *rand.Rand, params types.Params, lazyRoot func() *template.Template) (requestDataGenerator, bool) {
+func NewParamsGeneratorFunc(localRand *rand.Rand, params types.Params, lazyRoot func() *template.Template) (requestDataGenerator, bool, bool) {
-	generators, isDynamic := buildKeyValueGenerators(localRand, params, lazyRoot)
+	generators, isDynamic, keysAreStatic := buildKeyValueGenerators(localRand, params, lazyRoot)
 
 	var (
 		key, value string
@@ -243,11 +268,11 @@ func NewParamsGeneratorFunc(localRand *rand.Rand, params types.Params, lazyRoot
 			reqData.Params[key] = append(reqData.Params[key], value)
 		}
 		return nil
-	}, isDynamic
+	}, isDynamic, keysAreStatic
 }
 
-func NewHeadersGeneratorFunc(localRand *rand.Rand, headers types.Headers, lazyRoot func() *template.Template) (requestDataGenerator, bool) {
+func NewHeadersGeneratorFunc(localRand *rand.Rand, headers types.Headers, lazyRoot func() *template.Template) (requestDataGenerator, bool, bool) {
-	generators, isDynamic := buildKeyValueGenerators(localRand, headers, lazyRoot)
+	generators, isDynamic, keysAreStatic := buildKeyValueGenerators(localRand, headers, lazyRoot)
 
 	var (
 		key, value string
@@ -268,11 +293,11 @@ func NewHeadersGeneratorFunc(localRand *rand.Rand, headers types.Headers, lazyRo
 			reqData.Headers[key] = append(reqData.Headers[key], value)
 		}
 		return nil
-	}, isDynamic
+	}, isDynamic, keysAreStatic
 }
 
-func NewCookiesGeneratorFunc(localRand *rand.Rand, cookies types.Cookies, lazyRoot func() *template.Template) (requestDataGenerator, bool) {
+func NewCookiesGeneratorFunc(localRand *rand.Rand, cookies types.Cookies, lazyRoot func() *template.Template) (requestDataGenerator, bool, bool) {
-	generators, isDynamic := buildKeyValueGenerators(localRand, cookies, lazyRoot)
+	generators, isDynamic, keysAreStatic := buildKeyValueGenerators(localRand, cookies, lazyRoot)
 
 	var (
 		key, value string
@@ -293,14 +318,26 @@ func NewCookiesGeneratorFunc(localRand *rand.Rand, cookies types.Cookies, lazyRo
 			reqData.Cookies[key] = append(reqData.Cookies[key], value)
 		}
 		return nil
-	}, isDynamic
+	}, isDynamic, keysAreStatic
 }
 
 func NewValuesGeneratorFunc(values []string, lazyRoot func() *template.Template) func() (valuesData, error) {
+	// No values configured: hand back one shared empty map instead of allocating a
+	// fresh one for every request. Nothing ever writes to it.
+	if len(values) == 0 {
+		empty := valuesData{Values: map[string]string{}}
+		return func() (valuesData, error) { return empty, nil }
+	}
+
 	generators := make([]func(_ any) (string, error), len(values))
 
+	isDynamic := false
 	for i, v := range values {
-		generators[i], _ = createTemplateFunc(v, lazyRoot)
+		var valueIsDynamic bool
+		generators[i], valueIsDynamic = createTemplateFunc(v, lazyRoot)
+		if valueIsDynamic {
+			isDynamic = true
+		}
 	}
 
 	var (
@@ -308,7 +345,7 @@ func NewValuesGeneratorFunc(values []string, lazyRoot func() *template.Template)
 		data     map[string]string
 		err      error
 	)
-	return func() (valuesData, error) {
+	generate := func() (valuesData, error) {
 		result := make(map[string]string)
 		for _, generator := range generators {
 			rendered, err = generator(nil)
@@ -326,6 +363,15 @@ func NewValuesGeneratorFunc(values []string, lazyRoot func() *template.Template)
 
 		return valuesData{Values: result}, nil
 	}
+
+	// Every value is a literal, so the parsed result is identical on every request:
+	// render and parse once instead of re-running godotenv per request.
+	if !isDynamic {
+		staticResult, staticErr := generate()
+		return func() (valuesData, error) { return staticResult, staticErr }
+	}
+
+	return generate
 }
 
 func createTemplateFunc(value string, lazyRoot func() *template.Template) (func(data any) (string, error), bool) {
@@ -335,15 +381,19 @@ func createTemplateFunc(value string, lazyRoot func() *template.Template) (func(
 
 	tmpl, err := lazyRoot().New("").Parse(value)
 	if err == nil && hasTemplateActions(tmpl) {
-		var err error
+		var (
+			buf bytes.Buffer
+			err error
+		)
 		return func(data any) (string, error) {
-			var buf bytes.Buffer
+			buf.Reset()
 			if err = tmpl.Execute(&buf, data); err != nil {
 				return "", types.NewTemplateRenderError(err)
 			}
 			return buf.String(), nil
 		}, true
 	}
+
 	return func(_ any) (string, error) { return value, nil }, false
 }
 
@@ -360,8 +410,9 @@ func buildKeyValueGenerators[T keyValueItem](
 	localRand *rand.Rand,
 	items []T,
 	lazyRoot func() *template.Template,
-) ([]keyValueGenerator, bool) {
+) ([]keyValueGenerator, bool, bool) {
 	isDynamic := false
+	keysAreStatic := true
 	generators := make([]keyValueGenerator, len(items))
 
 	for generatorIndex, item := range items {
@@ -372,6 +423,7 @@ func buildKeyValueGenerators[T keyValueItem](
 		keyFunc, keyIsDynamic := createTemplateFunc(keyValue.Key, lazyRoot)
 		if keyIsDynamic {
 			isDynamic = true
+			keysAreStatic = false
 		}
 
 		// Generate value functions
@@ -394,7 +446,7 @@ func buildKeyValueGenerators[T keyValueItem](
 		}
 	}
 
-	return generators, isDynamic
+	return generators, isDynamic, keysAreStatic
 }
 
 func buildStringSliceGenerator(

internal/sarin/response.go

@@ -2,7 +2,6 @@ package sarin
 
 import (
 	"encoding/json"
-	"fmt"
 	"math/big"
 	"os"
 	"slices"
@@ -10,8 +9,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/charmbracelet/lipgloss"
+	"charm.land/lipgloss/v2"
-	"github.com/charmbracelet/lipgloss/table"
+	"charm.land/lipgloss/v2/table"
 	"go.yaml.in/yaml/v4"
 )
 
@@ -159,7 +158,7 @@ func (data *SarinResponseData) PrintTable() {
 			return cellStyle
 		})
 
-	fmt.Println(tbl)
+	lipgloss.Println(tbl)
 }
 
 func (data *SarinResponseData) PrintJSON() {

internal/sarin/runner.go

@@ -2,8 +2,13 @@ package sarin
 
 import (
 	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
 	"net/url"
 	"os"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -14,20 +19,165 @@ import (
 	"go.aykhans.me/sarin/internal/types"
 )
 
-type runtimeMessageLevel uint8
+type runtimeLogLevel uint8
 
 const (
-	runtimeMessageLevelWarning runtimeMessageLevel = iota
+	runtimeLogLevelInfo runtimeLogLevel = iota
-	runtimeMessageLevelError
+	runtimeLogLevelError
 )
 
-type runtimeMessage struct {
+type runtimeLog struct {
 	timestamp time.Time
-	level     runtimeMessageLevel
+	level     runtimeLogLevel
 	text      string
 }
 
-type messageSender func(level runtimeMessageLevel, text string)
+type runtimeLogger func(level runtimeLogLevel, text string)
+
+// SplitLogLevels parses a comma-separated log-level string into a deduplicated
+// slice of level tokens (surrounding whitespace trimmed, empties dropped). Level
+// names are matched case-sensitively, like the other enum options.
+func SplitLogLevels(levels string) []string {
+	var out []string
+	seen := make(map[string]bool)
+	for part := range strings.SplitSeq(levels, ",") {
+		token := strings.TrimSpace(part)
+		if token == "" || seen[token] {
+			continue
+		}
+		seen[token] = true
+		out = append(out, token)
+	}
+	return out
+}
+
+// IsInteractiveTerminal reports whether fd is a terminal that can actually be
+// drawn on. A pty reports as a terminal even while its size is still zero, and
+// Bubble Tea paints into a width x height cell buffer, so a zero dimension
+// renders nothing at all.
+func IsInteractiveTerminal(fd uintptr) bool {
+	if !term.IsTerminal(fd) {
+		return false
+	}
+	width, height, err := term.GetSize(fd)
+	return err == nil && width > 0 && height > 0
+}
+
+// respLogger logs a single completed response.
+type respLogger func(duration time.Duration, resp *fasthttp.Response)
+
+func noopLog(runtimeLogLevel, string)               {}
+func noopRespLog(time.Duration, *fasthttp.Response) {}
+
+// gateSendLog wraps emit with level filtering decided once from the enabled
+// levels. It stays general (any level filters correctly) while avoiding a
+// per-log check when both levels are on and any work at all when both are off.
+func gateSendLog(logInfo, logError bool, emit func(level runtimeLogLevel, text string)) runtimeLogger {
+	switch {
+	case logInfo && logError:
+		return emit
+	case logInfo:
+		return func(level runtimeLogLevel, text string) {
+			if level == runtimeLogLevelInfo {
+				emit(level, text)
+			}
+		}
+	case logError:
+		return func(level runtimeLogLevel, text string) {
+			if level == runtimeLogLevelError {
+				emit(level, text)
+			}
+		}
+	default:
+		return noopLog
+	}
+}
+
+// respBodySnippetLen bounds how many bytes of the body the compact (TUI)
+// rendering shows.
+const respBodySnippetLen = 100
+
+// formatRuntimeLogLine renders a runtime log as a plain (unstyled) line for
+// stderr output. ANSI styling is left to the TUI.
+func formatRuntimeLogLine(timestamp time.Time, level runtimeLogLevel, text string) string {
+	levelStr := "ERROR"
+	if level == runtimeLogLevelInfo {
+		levelStr = "INFO"
+	}
+	return "[" + timestamp.Format("15:04:05") + "] " + levelStr + ": " + text
+}
+
+// respToLog renders a response as a compact one-line summary for the TUI log box
+// (the "[time] INFO:" prefix is added by the TUI).
+func respToLog(duration time.Duration, resp *fasthttp.Response) string {
+	var sb strings.Builder
+	sb.WriteString(statusCodeToString(resp.StatusCode()))
+	sb.WriteString(" ")
+	sb.WriteString(Duration(duration).String())
+	if snippet := bodySnippet(resp.Body(), respBodySnippetLen); snippet != "" {
+		sb.WriteString(" | ")
+		sb.WriteString(snippet)
+	}
+	return sb.String()
+}
+
+type respLogEntry struct {
+	Status   int                 `json:"status"`
+	Duration string              `json:"duration"`
+	Headers  map[string][]string `json:"headers,omitempty"`
+	Body     string              `json:"body,omitempty"`
+}
+
+// respToLogJSON renders a response as a single, self-contained JSON line so the
+// stderr stream stays valid NDJSON (pipeable to jq or any consumer).
+func respToLogJSON(duration time.Duration, resp *fasthttp.Response) string {
+	entry := respLogEntry{
+		Status:   resp.StatusCode(),
+		Duration: Duration(duration).String(),
+		Headers:  collectRespHeaders(resp),
+		Body:     string(resp.Body()),
+	}
+	data, err := json.Marshal(entry)
+	if err != nil {
+		return `{"error":"failed to marshal response log"}`
+	}
+	return string(data)
+}
+
+func collectRespHeaders(resp *fasthttp.Response) map[string][]string {
+	headers := make(map[string][]string)
+	for key, value := range resp.Header.All() {
+		k := string(key)
+		headers[k] = append(headers[k], string(value))
+	}
+	return headers
+}
+
+// bodySnippet returns the first maxLen bytes of body collapsed onto a single
+// line (control characters replaced with spaces), with an ellipsis when truncated.
+func bodySnippet(body []byte, maxLen int) string {
+	if len(body) == 0 {
+		return ""
+	}
+
+	truncated := false
+	if len(body) > maxLen {
+		body = body[:maxLen]
+		truncated = true
+	}
+
+	s := strings.Map(func(r rune) rune {
+		if r == '\n' || r == '\r' || r == '\t' {
+			return ' '
+		}
+		return r
+	}, string(body))
+
+	if truncated {
+		s += "..."
+	}
+	return s
+}
 
 type sarin struct {
 	workers        uint
@@ -40,11 +190,14 @@ type sarin struct {
 	totalRequests  *uint64
 	totalDuration  *time.Duration
 	timeout        time.Duration
-	quiet          bool
+	showProgress   bool
 	skipCertVerify bool
 	values         []string
 	collectStats   bool
 	dryRun         bool
+	logInfo        bool
+	logError       bool
+	logFile        string
 
 	hostClients []*fasthttp.HostClient
 	responses   *SarinResponseData
@@ -65,7 +218,7 @@ func NewSarin(
 	workers uint,
 	totalRequests *uint64,
 	totalDuration *time.Duration,
-	quiet bool,
+	showProgress bool,
 	skipCertVerify bool,
 	params types.Params,
 	headers types.Headers,
@@ -75,6 +228,8 @@ func NewSarin(
 	values []string,
 	collectStats bool,
 	dryRun bool,
+	logLevel string,
+	logFile string,
 	luaScripts []string,
 	jsScripts []string,
 ) (*sarin, error) {
@@ -82,6 +237,17 @@ func NewSarin(
 		workers = 1
 	}
 
+	// Resolve which log levels are enabled once, up front.
+	var logInfo, logError bool
+	for _, level := range SplitLogLevels(logLevel) {
+		switch level {
+		case "info":
+			logInfo = true
+		case "error":
+			logError = true
+		}
+	}
+
 	hostClients, err := newHostClients(ctx, timeout, proxies, workers, requestURL, skipCertVerify)
 	if err != nil {
 		return nil, err
@@ -111,11 +277,14 @@ func NewSarin(
 		totalRequests:  totalRequests,
 		totalDuration:  totalDuration,
 		timeout:        timeout,
-		quiet:          quiet,
+		showProgress:   showProgress,
 		skipCertVerify: skipCertVerify,
 		values:         values,
 		collectStats:   collectStats,
 		dryRun:         dryRun,
+		logInfo:        logInfo,
+		logError:       logError,
+		logFile:        logFile,
 		hostClients:    hostClients,
 		fileCache:      NewFileCache(time.Second * 10),
 		scriptChain:    scriptChain,
@@ -128,73 +297,95 @@ func NewSarin(
 	return srn, nil
 }
 
-func (q sarin) GetResponses() *SarinResponseData {
+func (s sarin) GetResponses() *SarinResponseData {
-	return q.responses
+	return s.responses
 }
 
-func (q sarin) Start(ctx context.Context, stopCtrl *StopController) {
+func (s sarin) Start(ctx context.Context, stopCtrl *StopController) {
 	jobsCtx, jobsCancel := context.WithCancel(ctx)
 
 	var workersWG sync.WaitGroup
-	jobsCh := make(chan struct{}, max(q.workers, 1))
+	jobsCh := make(chan struct{}, max(s.workers, 1))
 
 	var counter atomic.Uint64
 
 	totalRequests := uint64(0)
-	if q.totalRequests != nil {
+	if s.totalRequests != nil {
-		totalRequests = *q.totalRequests
+		totalRequests = *s.totalRequests
 	}
 
-	var streamCtx context.Context
+	onTerminal := IsInteractiveTerminal(os.Stdout.Fd())
-	var streamCancel context.CancelFunc
+	// The progress bar needs an interactive terminal to render.
-	var streamCh chan struct{}
+	showProgressBar := s.showProgress && onTerminal
-	var messageChannel chan runtimeMessage
+	// The bubbletea TUI hosts the bar and/or the live log box, so it runs whenever
-	var sendMessage messageSender
+	// either has something to show: the bar, or logs that would land in the box
+	// (i.e. logs are enabled and not redirected to a file).
+	runTUI := showProgressBar || (onTerminal && (s.logInfo || s.logError) && s.logFile == "")
 
-	if !q.quiet && !term.IsTerminal(os.Stdout.Fd()) {
+	// Open the log file up front, before registering any defer, so a bad path
-		q.quiet = true
+	// exits cleanly.
+	var logFile *os.File
+	if s.logFile != "" {
+		f, err := os.OpenFile(s.logFile, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o600)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, "failed to open log file "+s.logFile+": "+err.Error())
+			os.Exit(1)
+		}
+		defer f.Close() //nolint:errcheck
+		logFile = f
 	}
 
-	if q.quiet {
+	var (
-		sendMessage = func(level runtimeMessageLevel, text string) {}
+		streamCtx     context.Context
-	} else {
+		streamCancel  context.CancelFunc
+		streamCh      chan struct{}
+		tuiLogChannel chan runtimeLog
+	)
+	if runTUI {
 		streamCtx, streamCancel = context.WithCancel(context.Background())
 		defer streamCancel()
 		streamCh = make(chan struct{})
-		messageChannel = make(chan runtimeMessage, max(q.workers, 1))
+		tuiLogChannel = make(chan runtimeLog, max(s.workers, 1))
-		sendMessage = func(level runtimeMessageLevel, text string) {
+	}
-			messageChannel <- runtimeMessage{
+
-				timestamp: time.Now(),
+	// Route logs: to the file if given, else to the TUI log box while it runs,
-				level:     level,
+	// otherwise to stderr.
-				text:      text,
+	var (
-			}
+		sendLog     runtimeLogger
-		}
+		sendRespLog respLogger
+	)
+	switch {
+	case logFile != nil:
+		sendLog, sendRespLog = s.newWriterLog(logFile)
+	case runTUI:
+		sendLog, sendRespLog = s.newChannelLog(tuiLogChannel)
+	default:
+		sendLog, sendRespLog = s.newWriterLog(os.Stderr)
 	}
 
 	// Start workers
-	q.startWorkers(&workersWG, jobsCh, q.hostClients, &counter, sendMessage)
+	s.startWorkers(&workersWG, jobsCh, s.hostClients, &counter, sendLog, sendRespLog)
 
-	if !q.quiet {
+	if runTUI {
-		// Start streaming to terminal
 		//nolint:contextcheck // streamCtx must remain active until all workers complete to ensure all collected data is streamed
-		go q.streamProgress(streamCtx, stopCtrl, streamCh, totalRequests, &counter, messageChannel)
+		go s.streamProgress(streamCtx, stopCtrl, streamCh, totalRequests, &counter, tuiLogChannel, showProgressBar)
 	}
 
 	// Setup duration-based cancellation
-	q.setupDurationTimeout(ctx, jobsCancel)
+	s.setupDurationTimeout(ctx, jobsCancel)
 	// Distribute jobs to workers.
 	// This blocks until all jobs are sent or the context is canceled.
-	q.sendJobs(jobsCtx, jobsCh)
+	s.sendJobs(jobsCtx, jobsCh)
 
 	// Close the jobs channel so workers stop after completing their current job
 	close(jobsCh)
 	// Wait until all workers stopped
 	workersWG.Wait()
-	if messageChannel != nil {
+	if tuiLogChannel != nil {
-		close(messageChannel)
+		close(tuiLogChannel)
 	}
 
-	if !q.quiet {
+	if runTUI {
 		// Stop the progress streaming
 		streamCancel()
 		// Wait until progress streaming has completely stopped
@@ -202,6 +393,45 @@ func (q sarin) Start(ctx context.Context, stopCtrl *StopController) {
 	}
 }
 
+// newWriterLog builds the loggers that write formatted lines to w (a log file or
+// stderr). sendLog stays general (it filters by each log's level); sendRespLog
+// only ever emits info, so its decision is baked once into a no-op when off.
+func (s sarin) newWriterLog(w io.Writer) (runtimeLogger, respLogger) {
+	// log.Logger serializes writes with its own mutex, so concurrent workers
+	// won't interleave lines.
+	logger := log.New(w, "", 0)
+
+	sendLog := gateSendLog(s.logInfo, s.logError, func(level runtimeLogLevel, text string) {
+		logger.Println(formatRuntimeLogLine(time.Now(), level, text))
+	})
+
+	var sendRespLog respLogger = noopRespLog
+	if s.logInfo {
+		sendRespLog = func(duration time.Duration, resp *fasthttp.Response) {
+			logger.Println(formatRuntimeLogLine(time.Now(), runtimeLogLevelInfo, respToLogJSON(duration, resp)))
+		}
+	}
+
+	return sendLog, sendRespLog
+}
+
+// newChannelLog builds the loggers that feed the TUI log box through ch, with the
+// same gating as newWriterLog.
+func (s sarin) newChannelLog(ch chan<- runtimeLog) (runtimeLogger, respLogger) {
+	sendLog := gateSendLog(s.logInfo, s.logError, func(level runtimeLogLevel, text string) {
+		ch <- runtimeLog{timestamp: time.Now(), level: level, text: text}
+	})
+
+	var sendRespLog respLogger = noopRespLog
+	if s.logInfo {
+		sendRespLog = func(duration time.Duration, resp *fasthttp.Response) {
+			ch <- runtimeLog{timestamp: time.Now(), level: runtimeLogLevelInfo, text: respToLog(duration, resp)}
+		}
+	}
+
+	return sendLog, sendRespLog
+}
+
 // newHostClients initializes HTTP clients for the given configuration.
 // It can return the following errors:
 // - types.ProxyDialError
@@ -228,18 +458,18 @@ func newHostClients(
 	)
 }
 
-func (q sarin) startWorkers(wg *sync.WaitGroup, jobs <-chan struct{}, hostClients []*fasthttp.HostClient, counter *atomic.Uint64, sendMessage messageSender) {
+func (s sarin) startWorkers(wg *sync.WaitGroup, jobs <-chan struct{}, hostClients []*fasthttp.HostClient, counter *atomic.Uint64, sendLog runtimeLogger, sendRespLog respLogger) {
-	for range max(q.workers, 1) {
+	for range max(s.workers, 1) {
 		wg.Go(func() {
-			q.Worker(jobs, NewHostClientGenerator(hostClients...), counter, sendMessage)
+			s.Worker(jobs, NewHostClientGenerator(hostClients...), counter, sendLog, sendRespLog)
 		})
 	}
 }
 
-func (q sarin) setupDurationTimeout(ctx context.Context, cancel context.CancelFunc) {
+func (s sarin) setupDurationTimeout(ctx context.Context, cancel context.CancelFunc) {
-	if q.totalDuration != nil {
+	if s.totalDuration != nil {
 		go func() {
-			timer := time.NewTimer(*q.totalDuration)
+			timer := time.NewTimer(*s.totalDuration)
 			defer timer.Stop()
 			select {
 			case <-timer.C:
@@ -251,9 +481,9 @@ func (q sarin) setupDurationTimeout(ctx context.Context, cancel context.CancelFu
 	}
 }
 
-func (q sarin) sendJobs(ctx context.Context, jobs chan<- struct{}) {
+func (s sarin) sendJobs(ctx context.Context, jobs chan<- struct{}) {
-	if q.totalRequests != nil && *q.totalRequests > 0 {
+	if s.totalRequests != nil && *s.totalRequests > 0 {
-		for range *q.totalRequests {
+		for range *s.totalRequests {
 			if ctx.Err() != nil {
 				break
 			}

internal/sarin/stop.go

@@ -6,7 +6,7 @@ import (
 	"sync"
 	"sync/atomic"
 
-	tea "github.com/charmbracelet/bubbletea"
+	tea "charm.land/bubbletea/v2"
 )
 
 const forceExitCode = 130

internal/sarin/template.go

@@ -207,18 +207,20 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 
 		// Fakeit / Person
 		// "fakeit_Person": fakeit.Person() *PersonInfo,
-		"fakeit_Name":       fakeit.Name,
+		"fakeit_Name":        fakeit.Name,
-		"fakeit_NamePrefix": fakeit.NamePrefix,
+		"fakeit_NamePrefix":  fakeit.NamePrefix,
-		"fakeit_NameSuffix": fakeit.NameSuffix,
+		"fakeit_NameSuffix":  fakeit.NameSuffix,
-		"fakeit_FirstName":  fakeit.FirstName,
+		"fakeit_FirstName":   fakeit.FirstName,
-		"fakeit_MiddleName": fakeit.MiddleName,
+		"fakeit_MiddleName":  fakeit.MiddleName,
-		"fakeit_LastName":   fakeit.LastName,
+		"fakeit_LastName":    fakeit.LastName,
-		"fakeit_Gender":     fakeit.Gender,
+		"fakeit_Gender":      fakeit.Gender,
-		"fakeit_Age":        fakeit.Age,
+		"fakeit_Age":         fakeit.Age,
-		"fakeit_Ethnicity":  fakeit.Ethnicity,
+		"fakeit_Ethnicity":   fakeit.Ethnicity,
-		"fakeit_SSN":        fakeit.SSN,
+		"fakeit_SSN":         fakeit.SSN,
-		"fakeit_EIN":        fakeit.EIN,
+		"fakeit_EIN":         fakeit.EIN,
-		"fakeit_Hobby":      fakeit.Hobby,
+		"fakeit_Hobby":       fakeit.Hobby,
+		"fakeit_SocialMedia": fakeit.SocialMedia,
+		"fakeit_Bio":         fakeit.Bio,
 		// "fakeit_Contact": fakeit.Contact() *ContactInfo,
 		"fakeit_Email":          fakeit.Email,
 		"fakeit_Phone":          fakeit.Phone,
@@ -232,6 +234,9 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 		// "fakeit_Generate": fakeit.Generate(value string) string,
 		"fakeit_Regex": fakeit.Regex,
 
+		// Fakeit / Database
+		// "fakeit_SQL": fakeit.SQL(so *SQLOptions) (string, error),
+
 		// Fakeit / Auth
 		"fakeit_Username": fakeit.Username,
 		"fakeit_Password": fakeit.Password,
@@ -269,6 +274,15 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 			return value
 		},
 
+		// Fakeit / Airline
+		"fakeit_AirlineAircraftType":  fakeit.AirlineAircraftType,
+		"fakeit_AirlineAirplane":      fakeit.AirlineAirplane,
+		"fakeit_AirlineAirport":       fakeit.AirlineAirport,
+		"fakeit_AirlineAirportIATA":   fakeit.AirlineAirportIATA,
+		"fakeit_AirlineFlightNumber":  fakeit.AirlineFlightNumber,
+		"fakeit_AirlineRecordLocator": fakeit.AirlineRecordLocator,
+		"fakeit_AirlineSeat":          fakeit.AirlineSeat,
+
 		// Fakeit / Game
 		"fakeit_Gamertag": fakeit.Gamertag,
 		// "fakeit_Dice": fakeit.Dice(numDice uint, sides []uint) []uint,
@@ -302,12 +316,16 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 		"fakeit_NounCollectiveThing":  fakeit.NounCollectiveThing,
 		"fakeit_NounCountable":        fakeit.NounCountable,
 		"fakeit_NounUncountable":      fakeit.NounUncountable,
+		"fakeit_NounProper":           fakeit.NounProper,
+		"fakeit_NounDeterminer":       fakeit.NounDeterminer,
 
 		// Verbs
-		"fakeit_Verb":        fakeit.Verb,
+		"fakeit_Verb":             fakeit.Verb,
-		"fakeit_VerbAction":  fakeit.VerbAction,
+		"fakeit_VerbAction":       fakeit.VerbAction,
-		"fakeit_VerbLinking": fakeit.VerbLinking,
+		"fakeit_VerbLinking":      fakeit.VerbLinking,
-		"fakeit_VerbHelping": fakeit.VerbHelping,
+		"fakeit_VerbHelping":      fakeit.VerbHelping,
+		"fakeit_VerbTransitive":   fakeit.VerbTransitive,
+		"fakeit_VerbIntransitive": fakeit.VerbIntransitive,
 
 		// Adverbs
 		"fakeit_Adverb":                    fakeit.Adverb,
@@ -344,6 +362,7 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 		"fakeit_PronounDemonstrative": fakeit.PronounDemonstrative,
 		"fakeit_PronounInterrogative": fakeit.PronounInterrogative,
 		"fakeit_PronounRelative":      fakeit.PronounRelative,
+		"fakeit_PronounIndefinite":    fakeit.PronounIndefinite,
 
 		// Connectives
 		"fakeit_Connective":            fakeit.Connective,
@@ -355,7 +374,8 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 		"fakeit_ConnectiveExamplify":   fakeit.ConnectiveExamplify,
 
 		// Words
-		"fakeit_Word": fakeit.Word,
+		"fakeit_Word":         fakeit.Word,
+		"fakeit_Interjection": fakeit.Interjection,
 
 		// Text
 		"fakeit_Sentence":            fakeit.Sentence,
@@ -366,6 +386,11 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 		"fakeit_Question":            fakeit.Question,
 		"fakeit_Quote":               fakeit.Quote,
 		"fakeit_Phrase":              fakeit.Phrase,
+		"fakeit_PhraseNoun":          fakeit.PhraseNoun,
+		"fakeit_PhraseVerb":          fakeit.PhraseVerb,
+		"fakeit_PhraseAdverb":        fakeit.PhraseAdverb,
+		"fakeit_PhrasePreposition":   fakeit.PhrasePreposition,
+		"fakeit_Comment":             fakeit.Comment,
 
 		// Fakeit / Foods
 		"fakeit_Fruit":     fakeit.Fruit,
@@ -375,6 +400,7 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 		"fakeit_Dinner":    fakeit.Dinner,
 		"fakeit_Snack":     fakeit.Snack,
 		"fakeit_Dessert":   fakeit.Dessert,
+		"fakeit_Drink":     fakeit.Drink,
 
 		// Fakeit / Misc
 		"fakeit_Bool": fakeit.Bool,
@@ -387,6 +413,7 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 		"fakeit_Color":      fakeit.Color,
 		"fakeit_HexColor":   fakeit.HexColor,
 		"fakeit_RGBColor":   fakeit.RGBColor,
+		"fakeit_HSLColor":   fakeit.HSLColor,
 		"fakeit_SafeColor":  fakeit.SafeColor,
 		"fakeit_NiceColors": fakeit.NiceColors,
 
@@ -530,6 +557,7 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 		// Fakeit / Language
 		"fakeit_Language":             fakeit.Language,
 		"fakeit_LanguageAbbreviation": fakeit.LanguageAbbreviation,
+		"fakeit_LanguageBCP":          fakeit.LanguageBCP,
 		"fakeit_ProgrammingLanguage":  fakeit.ProgrammingLanguage,
 
 		// Fakeit / Number
@@ -540,25 +568,29 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 		"fakeit_Int16":        fakeit.Int16,
 		"fakeit_Int32":        fakeit.Int32,
 		"fakeit_Int64":        fakeit.Int64,
+		"fakeit_IntRange":     fakeit.IntRange,
 		"fakeit_Uint":         fakeit.Uint,
 		"fakeit_UintN":        fakeit.UintN,
 		"fakeit_Uint8":        fakeit.Uint8,
 		"fakeit_Uint16":       fakeit.Uint16,
 		"fakeit_Uint32":       fakeit.Uint32,
 		"fakeit_Uint64":       fakeit.Uint64,
+		"fakeit_UintRange":    fakeit.UintRange,
 		"fakeit_Float32":      fakeit.Float32,
 		"fakeit_Float32Range": fakeit.Float32Range,
 		"fakeit_Float64":      fakeit.Float64,
 		"fakeit_Float64Range": fakeit.Float64Range,
 		// "fakeit_ShuffleInts":  fakeit.ShuffleInts,
-		"fakeit_RandomInt": fakeit.RandomInt,
+		"fakeit_RandomInt":  fakeit.RandomInt,
-		"fakeit_HexUint":   fakeit.HexUint,
+		"fakeit_RandomUint": fakeit.RandomUint,
+		"fakeit_HexUint":    fakeit.HexUint,
 
 		// Fakeit / String
 		"fakeit_Digit":    fakeit.Digit,
 		"fakeit_DigitN":   fakeit.DigitN,
 		"fakeit_Letter":   fakeit.Letter,
 		"fakeit_LetterN":  fakeit.LetterN,
+		"fakeit_Vowel":    fakeit.Vowel,
 		"fakeit_Lexify":   fakeit.Lexify,
 		"fakeit_Numerify": fakeit.Numerify,
 		// "fakeit_ShuffleStrings": fakeit.ShuffleStrings,
@@ -602,12 +634,14 @@ func NewDefaultTemplateFuncMap(randSource rand.Source, fileCache *FileCache) tem
 
 		// Fakeit / Error
 		"fakeit_Error":           func() string { return fakeit.Error().Error() },
+		"fakeit_ErrorObject":     func() string { return fakeit.ErrorObject().Error() },
 		"fakeit_ErrorDatabase":   func() string { return fakeit.ErrorDatabase().Error() },
 		"fakeit_ErrorGRPC":       func() string { return fakeit.ErrorGRPC().Error() },
 		"fakeit_ErrorHTTP":       func() string { return fakeit.ErrorHTTP().Error() },
 		"fakeit_ErrorHTTPClient": func() string { return fakeit.ErrorHTTPClient().Error() },
 		"fakeit_ErrorHTTPServer": func() string { return fakeit.ErrorHTTPServer().Error() },
 		"fakeit_ErrorRuntime":    func() string { return fakeit.ErrorRuntime().Error() },
+		"fakeit_ErrorValidation": func() string { return fakeit.ErrorValidation().Error() },
 
 		// Fakeit / School
 		"fakeit_School": fakeit.School,

internal/sarin/tui.go

@@ -2,38 +2,86 @@ package sarin
 
 import (
 	"context"
+	"slices"
 	"strconv"
 	"strings"
 	"sync/atomic"
 	"time"
 
-	"github.com/charmbracelet/bubbles/progress"
+	"charm.land/bubbles/v2/progress"
-	"github.com/charmbracelet/bubbles/spinner"
+	"charm.land/bubbles/v2/spinner"
-	tea "github.com/charmbracelet/bubbletea"
+	tea "charm.land/bubbletea/v2"
-	"github.com/charmbracelet/lipgloss"
+	"charm.land/lipgloss/v2"
 )
 
 type tickMsg time.Time
 
-var (
+// logBatch carries the log lines accumulated since the last repaint.
-	helpStyle           = lipgloss.NewStyle().Foreground(lipgloss.Color("#d1d1d1"))
+type logBatch []runtimeLog
-	errorStyle          = lipgloss.NewStyle().Foreground(lipgloss.Color("#FC5B5B")).Bold(true)
+
-	warningStyle        = lipgloss.NewStyle().Foreground(lipgloss.Color("#FFD93D")).Bold(true)
+const (
-	messageChannelStyle = lipgloss.NewStyle().
+	// logBoxLines is how many lines the log box shows at once.
-				Border(lipgloss.ThickBorder(), false, false, false, true).
+	logBoxLines = 8
-				BorderForeground(lipgloss.Color("#757575")).
+	// logBatchInterval is how often accumulated logs are handed to the program.
-				PaddingLeft(1).
+	logBatchInterval = 250 * time.Millisecond
-				Margin(1, 0, 0, 0).
-				Foreground(lipgloss.Color("#888888"))
 )
 
+var (
+	helpStyle  = lipgloss.NewStyle().Foreground(lipgloss.Color("#d1d1d1"))
+	errorStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#FC5B5B")).Bold(true)
+	infoStyle  = lipgloss.NewStyle().Foreground(lipgloss.Color("#5BC0FC")).Bold(true)
+
+	errorLabel = errorStyle.Render("ERROR: ")
+	infoLabel  = infoStyle.Render("INFO: ")
+
+	logChannelStyle = lipgloss.NewStyle().
+			Border(lipgloss.ThickBorder(), false, false, false, true).
+			BorderForeground(lipgloss.Color("#757575")).
+			PaddingLeft(1).
+			Margin(1, 0, 0, 0).
+			Foreground(lipgloss.Color("#888888"))
+)
+
+// renderRuntimeLog builds a single styled log line for the TUI log box.
+func renderRuntimeLog(log runtimeLog) string {
+	label := errorLabel
+	if log.level == runtimeLogLevelInfo {
+		label = infoLabel
+	}
+	return "[" + log.timestamp.Format("15:04:05") + "] " + label + log.text
+}
+
+// renderLogBox renders the styled log box, or "" when there are no lines.
+func renderLogBox(logs []string) string {
+	var b strings.Builder
+	for i, line := range logs {
+		if len(line) > 0 {
+			b.WriteString(line)
+			if i < len(logs)-1 {
+				b.WriteString("\n")
+			}
+		}
+	}
+	if b.Len() == 0 {
+		return ""
+	}
+	return logChannelStyle.Render(b.String())
+}
+
+func helpLine(cancelling bool) string {
+	if cancelling {
+		return helpStyle.Render("Stopping... (Ctrl+C again to force)")
+	}
+	return helpStyle.Render("Press Ctrl+C to quit")
+}
+
 type progressModel struct {
 	progress   progress.Model
 	startTime  time.Time
-	messages   []string
+	logs       []string
 	counter    *atomic.Uint64
-	current    uint64
 	maxValue   uint64
+	showBar    bool
 	ctx        context.Context //nolint:containedctx
 	stop       func()
 	cancelling bool
@@ -45,33 +93,24 @@ func (m progressModel) Init() tea.Cmd {
 
 func (m progressModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	switch msg := msg.(type) {
-	case tea.KeyMsg:
+	case tea.KeyPressMsg:
-		if msg.Type == tea.KeyCtrlC {
+		if msg.String() == "ctrl+c" {
 			m.cancelling = true
 			m.stop()
 		}
 		return m, nil
 
 	case tea.WindowSizeMsg:
-		m.progress.Width = max(10, msg.Width-1)
+		m.progress.SetWidth(max(10, msg.Width-1))
 		if m.ctx.Err() != nil {
 			return m, tea.Quit
 		}
 		return m, nil
 
-	case runtimeMessage:
+	case logBatch:
-		var msgBuilder strings.Builder
+		for _, entry := range msg {
-		msgBuilder.WriteString("[")
+			m.logs = append(m.logs[1:], renderRuntimeLog(entry))
-		msgBuilder.WriteString(msg.timestamp.Format("15:04:05"))
-		msgBuilder.WriteString("] ")
-		switch msg.level {
-		case runtimeMessageLevelError:
-			msgBuilder.WriteString(errorStyle.Render("ERROR: "))
-		case runtimeMessageLevelWarning:
-			msgBuilder.WriteString(warningStyle.Render("WARNING: "))
 		}
-		msgBuilder.WriteString(msg.text)
-		m.messages = append(m.messages[1:], msgBuilder.String())
 		if m.ctx.Err() != nil {
 			return m, tea.Quit
 		}
@@ -91,39 +130,28 @@ func (m progressModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	}
 }
 
-func (m progressModel) View() string {
+func (m progressModel) View() tea.View {
-	var messagesBuilder strings.Builder
+	var b strings.Builder
-	for i, msg := range m.messages {
+	if box := renderLogBox(m.logs); box != "" {
-		if len(msg) > 0 {
+		b.WriteString(box)
-			messagesBuilder.WriteString(msg)
+		b.WriteString("\n")
-			if i < len(m.messages)-1 {
-				messagesBuilder.WriteString("\n")
-			}
-		}
 	}
 
-	var finalBuilder strings.Builder
+	if m.showBar {
-	if messagesBuilder.Len() > 0 {
+		current := m.counter.Load()
-		finalBuilder.WriteString(messageChannelStyle.Render(messagesBuilder.String()))
+		b.WriteString("\n ")
-		finalBuilder.WriteString("\n")
+		b.WriteString(strconv.FormatUint(current, 10))
+		b.WriteString("/")
+		b.WriteString(strconv.FormatUint(m.maxValue, 10))
+		b.WriteString(" - ")
+		b.WriteString(time.Since(m.startTime).Round(time.Second / 10).String())
+		b.WriteString("\n ")
+		b.WriteString(m.progress.ViewAs(float64(current) / float64(m.maxValue)))
 	}
 
-	m.current = m.counter.Load()
+	b.WriteString("\n\n  ")
-	finalBuilder.WriteString("\n ")
+	b.WriteString(helpLine(m.cancelling))
-	finalBuilder.WriteString(strconv.FormatUint(m.current, 10))
+	return tea.NewView(b.String())
-	finalBuilder.WriteString("/")
-	finalBuilder.WriteString(strconv.FormatUint(m.maxValue, 10))
-	finalBuilder.WriteString(" - ")
-	finalBuilder.WriteString(time.Since(m.startTime).Round(time.Second / 10).String())
-	finalBuilder.WriteString("\n ")
-	finalBuilder.WriteString(m.progress.ViewAs(float64(m.current) / float64(m.maxValue)))
-	finalBuilder.WriteString("\n\n  ")
-	if m.cancelling {
-		finalBuilder.WriteString(helpStyle.Render("Stopping... (Ctrl+C again to force)"))
-	} else {
-		finalBuilder.WriteString(helpStyle.Render("Press Ctrl+C to quit"))
-	}
-	return finalBuilder.String()
 }
 
 func progressTickCmd() tea.Cmd {
@@ -138,7 +166,8 @@ type infiniteProgressModel struct {
 	spinner    spinner.Model
 	startTime  time.Time
 	counter    *atomic.Uint64
-	messages   []string
+	logs       []string
+	showBar    bool
 	ctx        context.Context //nolint:containedctx
 	quit       bool
 	stop       func()
@@ -151,26 +180,17 @@ func (m infiniteProgressModel) Init() tea.Cmd {
 
 func (m infiniteProgressModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	switch msg := msg.(type) {
-	case tea.KeyMsg:
+	case tea.KeyPressMsg:
-		if msg.Type == tea.KeyCtrlC {
+		if msg.String() == "ctrl+c" {
 			m.cancelling = true
 			m.stop()
 		}
 		return m, nil
 
-	case runtimeMessage:
+	case logBatch:
-		var msgBuilder strings.Builder
+		for _, entry := range msg {
-		msgBuilder.WriteString("[")
+			m.logs = append(m.logs[1:], renderRuntimeLog(entry))
-		msgBuilder.WriteString(msg.timestamp.Format("15:04:05"))
-		msgBuilder.WriteString("] ")
-		switch msg.level {
-		case runtimeMessageLevelError:
-			msgBuilder.WriteString(errorStyle.Render("ERROR: "))
-		case runtimeMessageLevelWarning:
-			msgBuilder.WriteString(warningStyle.Render("WARNING: "))
 		}
-		msgBuilder.WriteString(msg.text)
-		m.messages = append(m.messages[1:], msgBuilder.String())
 		if m.ctx.Err() != nil {
 			m.quit = true
 			return m, tea.Quit
@@ -188,65 +208,64 @@ func (m infiniteProgressModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	}
 }
 
-func (m infiniteProgressModel) View() string {
+func (m infiniteProgressModel) View() tea.View {
-	var messagesBuilder strings.Builder
+	var b strings.Builder
-	for i, msg := range m.messages {
+	if box := renderLogBox(m.logs); box != "" {
-		if len(msg) > 0 {
+		b.WriteString(box)
-			messagesBuilder.WriteString(msg)
+		b.WriteString("\n")
-			if i < len(m.messages)-1 {
-				messagesBuilder.WriteString("\n")
-			}
-		}
 	}
 
-	var finalBuilder strings.Builder
+	// Without a spinner, the view is just the log box (plus help until quit).
-	if messagesBuilder.Len() > 0 {
+	if !m.showBar {
-		finalBuilder.WriteString(messageChannelStyle.Render(messagesBuilder.String()))
+		if !m.quit {
-		finalBuilder.WriteString("\n")
+			b.WriteString("\n\n  ")
+			b.WriteString(helpLine(m.cancelling))
+		}
+		return tea.NewView(b.String())
 	}
 
 	if m.quit {
-		finalBuilder.WriteString("\n  ")
+		b.WriteString("\n  ")
-		finalBuilder.WriteString(strconv.FormatUint(m.counter.Load(), 10))
+		b.WriteString(strconv.FormatUint(m.counter.Load(), 10))
-		finalBuilder.WriteString("  ")
+		b.WriteString("  ")
-		finalBuilder.WriteString(infiniteProgressStyle.Render("∙∙∙∙∙"))
+		b.WriteString(infiniteProgressStyle.Render("∙∙∙∙∙"))
-		finalBuilder.WriteString("  ")
+		b.WriteString("  ")
-		finalBuilder.WriteString(time.Since(m.startTime).Round(time.Second / 10).String())
+		b.WriteString(time.Since(m.startTime).Round(time.Second / 10).String())
-		finalBuilder.WriteString("\n\n")
+		b.WriteString("\n\n")
 	} else {
-		finalBuilder.WriteString("\n  ")
+		b.WriteString("\n  ")
-		finalBuilder.WriteString(strconv.FormatUint(m.counter.Load(), 10))
+		b.WriteString(strconv.FormatUint(m.counter.Load(), 10))
-		finalBuilder.WriteString("  ")
+		b.WriteString("  ")
-		finalBuilder.WriteString(m.spinner.View())
+		b.WriteString(m.spinner.View())
-		finalBuilder.WriteString("  ")
+		b.WriteString("  ")
-		finalBuilder.WriteString(time.Since(m.startTime).Round(time.Second / 10).String())
+		b.WriteString(time.Since(m.startTime).Round(time.Second / 10).String())
-		finalBuilder.WriteString("\n\n  ")
+		b.WriteString("\n\n  ")
-		if m.cancelling {
+		b.WriteString(helpLine(m.cancelling))
-			finalBuilder.WriteString(helpStyle.Render("Stopping... (Ctrl+C again to force)"))
-		} else {
-			finalBuilder.WriteString(helpStyle.Render("Press Ctrl+C to quit"))
-		}
 	}
-	return finalBuilder.String()
+	return tea.NewView(b.String())
 }
 
-func (q sarin) streamProgress(
+func (s sarin) streamProgress(
 	ctx context.Context,
 	stopCtrl *StopController,
 	done chan<- struct{},
 	total uint64,
 	counter *atomic.Uint64,
-	messageChannel <-chan runtimeMessage,
+	logChannel <-chan runtimeLog,
+	showBar bool,
 ) {
 	var program *tea.Program
 	if total > 0 {
 		model := progressModel{
-			progress:  progress.New(progress.WithGradient("#151594", "#00D4FF")),
+			progress: progress.New(
+				progress.WithColors(lipgloss.Color("#151594"), lipgloss.Color("#00D4FF")),
+				progress.WithFillCharacters(progress.DefaultFullCharFullBlock, progress.DefaultEmptyCharBlock),
+			),
 			startTime: time.Now(),
-			messages:  make([]string, 8),
+			logs:      make([]string, logBoxLines),
 			counter:   counter,
-			current:   0,
 			maxValue:  total,
+			showBar:   showBar,
 			ctx:       ctx,
 			stop:      stopCtrl.Stop,
 		}
@@ -274,7 +293,8 @@ func (q sarin) streamProgress(
 			),
 			startTime: time.Now(),
 			counter:   counter,
-			messages:  make([]string, 8),
+			logs:      make([]string, logBoxLines),
+			showBar:   showBar,
 			ctx:       ctx,
 			stop:      stopCtrl.Stop,
 			quit:      false,
@@ -286,9 +306,35 @@ func (q sarin) streamProgress(
 	stopCtrl.AttachProgram(program)
 	defer stopCtrl.AttachProgram(nil)
 
+	// Bubble Tea repaints once per message, so forwarding every log made the run
+	// wait on the terminal. Send only what the box shows, on a fixed cadence.
 	go func() {
-		for msg := range messageChannel {
+		ticker := time.NewTicker(logBatchInterval)
-			program.Send(msg)
+		defer ticker.Stop()
+
+		pending := make(logBatch, 0, logBoxLines)
+		flush := func() {
+			if len(pending) == 0 {
+				return
+			}
+			program.Send(slices.Clone(pending))
+			pending = pending[:0]
+		}
+
+		for {
+			select {
+			case entry, ok := <-logChannel:
+				if !ok {
+					flush()
+					return
+				}
+				if len(pending) == logBoxLines {
+					pending = append(pending[:0], pending[1:]...)
+				}
+				pending = append(pending, entry)
+			case <-ticker.C:
+				flush()
+			}
 		}
 	}()
 

internal/sarin/worker.go

@@ -12,28 +12,29 @@ import (
 const dryRunResponseKey = "dry-run"
 
 // statusCodeStrings contains pre-computed string representations for HTTP status codes 100-599.
-var statusCodeStrings = func() map[int]string {
+var statusCodeStrings = func() [500]string {
-	m := make(map[int]string, 500)
+	var codes [500]string
-	for i := 100; i < 600; i++ {
+	for i := range codes {
-		m[i] = strconv.Itoa(i)
+		codes[i] = strconv.Itoa(i + 100)
 	}
-	return m
+	return codes
 }()
 
 // statusCodeToString returns a string representation of the HTTP status code.
-// Uses a pre-computed map for codes 100-599, falls back to strconv.Itoa for others.
+// Uses a pre-computed table for codes 100-599, falls back to strconv.Itoa for others.
 func statusCodeToString(code int) string {
-	if s, ok := statusCodeStrings[code]; ok {
+	if i := code - 100; i >= 0 && i < len(statusCodeStrings) {
-		return s
+		return statusCodeStrings[i]
 	}
 	return strconv.Itoa(code)
 }
 
-func (q sarin) Worker(
+func (s sarin) Worker(
 	jobs <-chan struct{},
 	hostClientGenerator HostClientGenerator,
 	counter *atomic.Uint64,
-	sendMessage messageSender,
+	sendLog runtimeLogger,
+	sendRespLog respLogger,
 ) {
 	req := fasthttp.AcquireRequest()
 	resp := fasthttp.AcquireResponse()
@@ -43,9 +44,9 @@ func (q sarin) Worker(
 	// Create script transformer for this worker (engines are not thread-safe)
 	// Scripts are pre-validated in NewSarin, so this should not fail
 	var scriptTransformer *script.Transformer
-	if !q.scriptChain.IsEmpty() {
+	if !s.scriptChain.IsEmpty() {
 		var err error
-		scriptTransformer, err = q.scriptChain.NewTransformer()
+		scriptTransformer, err = s.scriptChain.NewTransformer()
 		if err != nil {
 			panic(err)
 		}
@@ -53,131 +54,140 @@ func (q sarin) Worker(
 	}
 
 	requestGenerator, isDynamic := NewRequestGenerator(
-		q.methods, q.requestURL, q.params, q.headers, q.cookies, q.bodies, q.values, q.fileCache, scriptTransformer,
+		s.methods, s.requestURL, s.params, s.headers, s.cookies, s.bodies, s.values, s.fileCache, scriptTransformer,
 	)
 
-	if q.dryRun {
+	if s.dryRun {
 		switch {
-		case q.collectStats && isDynamic:
+		case s.collectStats && isDynamic:
-			q.workerDryRunStatsWithDynamic(jobs, req, requestGenerator, counter, sendMessage)
+			s.workerDryRunStatsWithDynamic(jobs, req, requestGenerator, counter, sendLog)
-		case q.collectStats && !isDynamic:
+		case s.collectStats && !isDynamic:
-			q.workerDryRunStatsWithStatic(jobs, req, requestGenerator, counter, sendMessage)
+			s.workerDryRunStatsWithStatic(jobs, req, requestGenerator, counter, sendLog)
-		case !q.collectStats && isDynamic:
+		case !s.collectStats && isDynamic:
-			q.workerDryRunNoStatsWithDynamic(jobs, req, requestGenerator, counter, sendMessage)
+			s.workerDryRunNoStatsWithDynamic(jobs, req, requestGenerator, counter, sendLog)
 		default:
-			q.workerDryRunNoStatsWithStatic(jobs, req, requestGenerator, counter, sendMessage)
+			s.workerDryRunNoStatsWithStatic(jobs, req, requestGenerator, counter, sendLog)
 		}
 	} else {
 		switch {
-		case q.collectStats && isDynamic:
+		case s.collectStats && isDynamic:
-			q.workerStatsWithDynamic(jobs, req, resp, requestGenerator, hostClientGenerator, counter, sendMessage)
+			s.workerStatsWithDynamic(jobs, req, resp, requestGenerator, hostClientGenerator, counter, sendLog, sendRespLog)
-		case q.collectStats && !isDynamic:
+		case s.collectStats && !isDynamic:
-			q.workerStatsWithStatic(jobs, req, resp, requestGenerator, hostClientGenerator, counter, sendMessage)
+			s.workerStatsWithStatic(jobs, req, resp, requestGenerator, hostClientGenerator, counter, sendLog, sendRespLog)
-		case !q.collectStats && isDynamic:
+		case !s.collectStats && isDynamic:
-			q.workerNoStatsWithDynamic(jobs, req, resp, requestGenerator, hostClientGenerator, counter, sendMessage)
+			s.workerNoStatsWithDynamic(jobs, req, resp, requestGenerator, hostClientGenerator, counter, sendLog, sendRespLog)
 		default:
-			q.workerNoStatsWithStatic(jobs, req, resp, requestGenerator, hostClientGenerator, counter, sendMessage)
+			s.workerNoStatsWithStatic(jobs, req, resp, requestGenerator, hostClientGenerator, counter, sendLog, sendRespLog)
 		}
 	}
 }
 
-func (q sarin) workerStatsWithDynamic(
+func (s sarin) workerStatsWithDynamic(
 	jobs <-chan struct{},
 	req *fasthttp.Request,
 	resp *fasthttp.Response,
 	requestGenerator RequestGenerator,
 	hostClientGenerator HostClientGenerator,
 	counter *atomic.Uint64,
-	sendMessage messageSender,
+	sendLog runtimeLogger,
+	sendRespLog respLogger,
 ) {
 	for range jobs {
 		req.Reset()
-		resp.Reset()
 
 		if err := requestGenerator(req); err != nil {
-			q.responses.Add(err.Error(), 0)
+			s.responses.Add(err.Error(), 0)
-			sendMessage(runtimeMessageLevelError, err.Error())
+			sendLog(runtimeLogLevelError, err.Error())
 			counter.Add(1)
 			continue
 		}
 
 		startTime := time.Now()
-		err := hostClientGenerator().DoTimeout(req, resp, q.timeout)
+		err := hostClientGenerator().DoTimeout(req, resp, s.timeout)
+		respDuration := time.Since(startTime)
+
 		if err != nil {
-			q.responses.Add(err.Error(), time.Since(startTime))
+			s.responses.Add(err.Error(), respDuration)
 		} else {
-			q.responses.Add(statusCodeToString(resp.StatusCode()), time.Since(startTime))
+			s.responses.Add(statusCodeToString(resp.StatusCode()), respDuration)
+			sendRespLog(respDuration, resp)
 		}
 		counter.Add(1)
 	}
 }
 
-func (q sarin) workerStatsWithStatic(
+func (s sarin) workerStatsWithStatic(
 	jobs <-chan struct{},
 	req *fasthttp.Request,
 	resp *fasthttp.Response,
 	requestGenerator RequestGenerator,
 	hostClientGenerator HostClientGenerator,
 	counter *atomic.Uint64,
-	sendMessage messageSender,
+	sendLog runtimeLogger,
+	sendRespLog respLogger,
 ) {
 	if err := requestGenerator(req); err != nil {
 		// Static request generation failed - record all jobs as errors
 		for range jobs {
-			q.responses.Add(err.Error(), 0)
+			s.responses.Add(err.Error(), 0)
-			sendMessage(runtimeMessageLevelError, err.Error())
+			sendLog(runtimeLogLevelError, err.Error())
 			counter.Add(1)
 		}
 		return
 	}
 
 	for range jobs {
-		resp.Reset()
-
 		startTime := time.Now()
-		err := hostClientGenerator().DoTimeout(req, resp, q.timeout)
+		err := hostClientGenerator().DoTimeout(req, resp, s.timeout)
+		respDuration := time.Since(startTime)
 		if err != nil {
-			q.responses.Add(err.Error(), time.Since(startTime))
+			s.responses.Add(err.Error(), respDuration)
 		} else {
-			q.responses.Add(statusCodeToString(resp.StatusCode()), time.Since(startTime))
+			s.responses.Add(statusCodeToString(resp.StatusCode()), respDuration)
+			sendRespLog(respDuration, resp)
 		}
 		counter.Add(1)
 	}
 }
 
-func (q sarin) workerNoStatsWithDynamic(
+func (s sarin) workerNoStatsWithDynamic(
 	jobs <-chan struct{},
 	req *fasthttp.Request,
 	resp *fasthttp.Response,
 	requestGenerator RequestGenerator,
 	hostClientGenerator HostClientGenerator,
 	counter *atomic.Uint64,
-	sendMessage messageSender,
+	sendLog runtimeLogger,
+	sendRespLog respLogger,
 ) {
 	for range jobs {
 		req.Reset()
-		resp.Reset()
 		if err := requestGenerator(req); err != nil {
-			sendMessage(runtimeMessageLevelError, err.Error())
+			sendLog(runtimeLogLevelError, err.Error())
 			counter.Add(1)
 			continue
 		}
-		_ = hostClientGenerator().DoTimeout(req, resp, q.timeout)
+		startTime := time.Now()
+		err := hostClientGenerator().DoTimeout(req, resp, s.timeout)
+		if err == nil {
+			sendRespLog(time.Since(startTime), resp)
+		}
 		counter.Add(1)
 	}
 }
 
-func (q sarin) workerNoStatsWithStatic(
+func (s sarin) workerNoStatsWithStatic(
 	jobs <-chan struct{},
 	req *fasthttp.Request,
 	resp *fasthttp.Response,
 	requestGenerator RequestGenerator,
 	hostClientGenerator HostClientGenerator,
 	counter *atomic.Uint64,
-	sendMessage messageSender,
+	sendLog runtimeLogger,
+	sendRespLog respLogger,
 ) {
 	if err := requestGenerator(req); err != nil {
-		sendMessage(runtimeMessageLevelError, err.Error())
+		sendLog(runtimeLogLevelError, err.Error())
 
 		// Static request generation failed - just count the jobs without sending
 		for range jobs {
@@ -187,81 +197,84 @@ func (q sarin) workerNoStatsWithStatic(
 	}
 
 	for range jobs {
-		resp.Reset()
+		startTime := time.Now()
-		_ = hostClientGenerator().DoTimeout(req, resp, q.timeout)
+		err := hostClientGenerator().DoTimeout(req, resp, s.timeout)
+		if err == nil {
+			sendRespLog(time.Since(startTime), resp)
+		}
 		counter.Add(1)
 	}
 }
 
-func (q sarin) workerDryRunStatsWithDynamic(
+func (s sarin) workerDryRunStatsWithDynamic(
 	jobs <-chan struct{},
 	req *fasthttp.Request,
 	requestGenerator RequestGenerator,
 	counter *atomic.Uint64,
-	sendMessage messageSender,
+	sendLog runtimeLogger,
 ) {
 	for range jobs {
 		req.Reset()
 		startTime := time.Now()
 		if err := requestGenerator(req); err != nil {
-			q.responses.Add(err.Error(), time.Since(startTime))
+			s.responses.Add(err.Error(), time.Since(startTime))
-			sendMessage(runtimeMessageLevelError, err.Error())
+			sendLog(runtimeLogLevelError, err.Error())
 			counter.Add(1)
 			continue
 		}
-		q.responses.Add(dryRunResponseKey, time.Since(startTime))
+		s.responses.Add(dryRunResponseKey, time.Since(startTime))
 		counter.Add(1)
 	}
 }
 
-func (q sarin) workerDryRunStatsWithStatic(
+func (s sarin) workerDryRunStatsWithStatic(
 	jobs <-chan struct{},
 	req *fasthttp.Request,
 	requestGenerator RequestGenerator,
 	counter *atomic.Uint64,
-	sendMessage messageSender,
+	sendLog runtimeLogger,
 ) {
 	if err := requestGenerator(req); err != nil {
 		// Static request generation failed - record all jobs as errors
 		for range jobs {
-			q.responses.Add(err.Error(), 0)
+			s.responses.Add(err.Error(), 0)
-			sendMessage(runtimeMessageLevelError, err.Error())
+			sendLog(runtimeLogLevelError, err.Error())
 			counter.Add(1)
 		}
 		return
 	}
 
 	for range jobs {
-		q.responses.Add(dryRunResponseKey, 0)
+		s.responses.Add(dryRunResponseKey, 0)
 		counter.Add(1)
 	}
 }
 
-func (q sarin) workerDryRunNoStatsWithDynamic(
+func (s sarin) workerDryRunNoStatsWithDynamic(
 	jobs <-chan struct{},
 	req *fasthttp.Request,
 	requestGenerator RequestGenerator,
 	counter *atomic.Uint64,
-	sendMessage messageSender,
+	sendLog runtimeLogger,
 ) {
 	for range jobs {
 		req.Reset()
 		if err := requestGenerator(req); err != nil {
-			sendMessage(runtimeMessageLevelError, err.Error())
+			sendLog(runtimeLogLevelError, err.Error())
 		}
 		counter.Add(1)
 	}
 }
 
-func (q sarin) workerDryRunNoStatsWithStatic(
+func (s sarin) workerDryRunNoStatsWithStatic(
 	jobs <-chan struct{},
 	req *fasthttp.Request,
 	requestGenerator RequestGenerator,
 	counter *atomic.Uint64,
-	sendMessage messageSender,
+	sendLog runtimeLogger,
 ) {
 	if err := requestGenerator(req); err != nil {
-		sendMessage(runtimeMessageLevelError, err.Error())
+		sendLog(runtimeLogLevelError, err.Error())
 	}
 
 	for range jobs {

nix/package.nix

@@ -0,0 +1,44 @@
+{
+  lib,
+  buildGoModule,
+  go_1_27,
+  rev ? "unknown",
+  buildDate ? "unknown",
+}:
+
+(buildGoModule.override { go = go_1_27; }) (finalAttrs: {
+  pname = "sarin";
+  version = "1.4.4"; # bump per release
+
+  src = lib.cleanSource ../.;
+
+  vendorHash = "sha256-77wMBIhsXUwZ97iAaJivB7qOuQhBZ1LJphnRWfUTjJo=";
+
+  subPackages = [ "cmd/cli" ];
+
+  env.CGO_ENABLED = 0; # fully static binary
+
+  ldflags = [
+    "-s"
+    "-w"
+    "-X=go.aykhans.me/sarin/internal/version.Version=v${finalAttrs.version}"
+    "-X=go.aykhans.me/sarin/internal/version.GitCommit=${rev}"
+    "-X=go.aykhans.me/sarin/internal/version.BuildDate=${buildDate}"
+  ];
+
+  preBuild = ''
+    ldflags+=("-X 'go.aykhans.me/sarin/internal/version.GoVersion=$(go version)'")
+  '';
+
+  postInstall = ''
+    mv $out/bin/cli $out/bin/sarin
+  '';
+
+  meta = {
+    description = "High-performance HTTP load testing tool built with Go and fasthttp";
+    homepage = "https://github.com/aykhans/sarin";
+    license = lib.licenses.mit;
+    mainProgram = "sarin";
+    maintainers = [ ];
+  };
+})