Add version variables

cmd/api/main.go

@@ -2,8 +2,11 @@ package main
 
 import (
 	"context"
+	"flag"
+	"fmt"
 	"os"
 	"os/signal"
+	"strings"
 	"syscall"
 
 	"github.com/aykhans/bsky-feedgen/pkg/api"
@@ -15,11 +18,21 @@ import (
 	_ "go.uber.org/automaxprocs"
 )
 
+type flags struct {
+	version bool
+}
+
 func main() {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 	go listenForTermination(func() { cancel() })
 
+	flags := getFlags()
+	if flags.version == true {
+		fmt.Printf("API version: %v\n", version)
+		os.Exit(0)
+	}
+
 	apiConfig, errMap := config.NewAPIConfig()
 	if errMap != nil {
 		logger.Log.Error("API ENV error", "error", errMap.ToStringMap())
@@ -59,3 +72,33 @@ func listenForTermination(do func()) {
 	<-sigChan
 	do()
 }
+
+func getFlags() *flags {
+	flags := &flags{}
+
+	flag.Usage = func() {
+		fmt.Println(
+			`Usage:
+
+consumer [flags]
+
+Flags:
+    -version         version information
+    -h, -help        Display this help message`)
+	}
+
+	flag.BoolVar(&flags.version, "version", false, "print version information")
+	flag.Parse()
+
+	if args := flag.Args(); len(args) > 0 {
+		if len(args) == 1 {
+			fmt.Printf("unexpected argument: %s\n\n", args[0])
+		} else {
+			fmt.Printf("unexpected arguments: %v\n\n", strings.Join(args, ", "))
+		}
+		flag.CommandLine.Usage()
+		os.Exit(1)
+	}
+
+	return flags
+}