Add config file support to CLI parser

Add -f/--config-file flag for loading YAML configs from local or remote sources. Fix error handling to return unmatched errors.

pkg/config/cli_test.go

@@ -20,6 +20,7 @@ func TestNewConfigCLIParser(t *testing.T) {
 
 		require.NotNil(t, parser)
 		assert.Equal(t, args, parser.args)
+		assert.Nil(t, parser.configFile)
 	})
 
 	t.Run("NewConfigCLIParser with nil args", func(t *testing.T) {
@@ -27,6 +28,7 @@ func TestNewConfigCLIParser(t *testing.T) {
 
 		require.NotNil(t, parser)
 		assert.Equal(t, []string{}, parser.args)
+		assert.Nil(t, parser.configFile)
 	})
 
 	t.Run("NewConfigCLIParser with empty args", func(t *testing.T) {
@@ -35,6 +37,21 @@ func TestNewConfigCLIParser(t *testing.T) {
 
 		require.NotNil(t, parser)
 		assert.Equal(t, args, parser.args)
+		assert.Nil(t, parser.configFile)
+	})
+}
+
+func TestConfigCLIParser_GetConfigFile(t *testing.T) {
+	t.Run("GetConfigFile returns nil when no config file is set", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo"})
+		assert.Nil(t, parser.GetConfigFile())
+	})
+
+	t.Run("GetConfigFile returns config file when set", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo"})
+		expectedConfigFile := &types.ConfigFile{}
+		parser.configFile = expectedConfigFile
+		assert.Equal(t, expectedConfigFile, parser.GetConfigFile())
 	})
 }
 
@@ -295,6 +312,58 @@ func TestConfigCLIParser_Parse(t *testing.T) {
 		assert.Equal(t, 10*time.Second, *config.Timeout)
 	})
 
+	t.Run("Parse with config-file flag valid YAML", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-f", "/path/to/config.yaml"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.NotNil(t, parser.GetConfigFile())
+	})
+
+	t.Run("Parse with config-file flag using long form", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "--config-file", "/path/to/config.yml"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.NotNil(t, parser.GetConfigFile())
+	})
+
+	t.Run("Parse with config-file flag invalid extension", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-f", "/path/to/config"})
+		config, err := parser.Parse()
+
+		assert.Nil(t, config)
+		var fieldErr types.FieldParseErrors
+		require.ErrorAs(t, err, &fieldErr)
+		assert.Len(t, fieldErr.Errors, 1)
+		assert.Equal(t, "config-file", fieldErr.Errors[0].Field)
+		assert.Contains(t, fieldErr.Errors[0].Err.Error(), "file extension not found")
+	})
+
+	t.Run("Parse with config-file flag unsupported file type", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-f", "/path/to/config.json"})
+		config, err := parser.Parse()
+
+		assert.Nil(t, config)
+		var fieldErr types.FieldParseErrors
+		require.ErrorAs(t, err, &fieldErr)
+		assert.Len(t, fieldErr.Errors, 1)
+		assert.Equal(t, "config-file", fieldErr.Errors[0].Field)
+		assert.Contains(t, fieldErr.Errors[0].Err.Error(), "file type")
+		assert.Contains(t, fieldErr.Errors[0].Err.Error(), "not supported")
+	})
+
+	t.Run("Parse with config-file flag remote URL", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-f", "https://example.com/config.yaml"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.NotNil(t, parser.GetConfigFile())
+	})
+
 	t.Run("Parse with all flags combined", func(t *testing.T) {
 		parser := NewConfigCLIParser([]string{
 			"dodo",
@@ -311,6 +380,7 @@ func TestConfigCLIParser_Parse(t *testing.T) {
 			"-c", "session=token123",
 			"-b", `{"data": "test"}`,
 			"-x", "http://proxy.example.com:3128",
+			"-f", "/path/to/config.yaml",
 		})
 		config, err := parser.Parse()
 
@@ -341,6 +411,8 @@ func TestConfigCLIParser_Parse(t *testing.T) {
 
 		assert.Len(t, config.Proxies, 1)
 		assert.Equal(t, "http://proxy.example.com:3128", config.Proxies[0].String())
+
+		assert.NotNil(t, parser.GetConfigFile())
 	})
 
 	t.Run("Parse with multiple field parse errors", func(t *testing.T) {
@@ -404,6 +476,7 @@ func TestConfigCLIParser_PrintHelp(t *testing.T) {
 		assert.Contains(t, output, "-x, -proxy")
 		assert.Contains(t, output, "-skip-verify")
 		assert.Contains(t, output, "-y, -yes")
+		assert.Contains(t, output, "-f, -config-file")
 
 		// Verify default values are included
 		assert.Contains(t, output, Defaults.Method)