feat: add language configuration for commit messages

- Add language field to config schema (en/es)
- Implement GetLanguage() and SetLanguage() functions
- Modify prompt generation to append language instruction
- Add interactive language selection in config command
- Display language in config get output

Users can now configure commit message language via:
- Manual config: language: es/en in .lazycommit.yaml
- Interactive: lazycommit config set

Author: lcarrasco

cmd/config.go

@@ -32,9 +32,11 @@ var getCmd = &cobra.Command{
 			fmt.Println("Error getting endpoint:", err)
 			os.Exit(1)
 		}
+		language := config.GetLanguage()
 		fmt.Printf("Active Provider: %s\n", provider)
 		fmt.Printf("Model: %s\n", model)
 		fmt.Printf("Endpoint: %s\n", endpoint)
+		fmt.Printf("Language: %s\n", language)
 	},
 }
 
@@ -99,6 +101,40 @@ func runInteractiveConfig() {
 		currentModel = ""
 	}
 
+	// Language configuration
+	currentLanguage := config.GetLanguage()
+	languagePrompt := &survey.Select{
+		Message: "Choose a language for commit messages:",
+		Options: []string{"English (en)", "Español (es)"},
+		Default: func() string {
+			if currentLanguage == "es" {
+				return "Español (es)"
+			}
+			return "English (en)"
+		}(),
+	}
+	var selectedLanguage string
+	err = survey.AskOne(languagePrompt, &selectedLanguage)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+
+	// Extract language code from selection
+	langCode := "en"
+	if selectedLanguage == "Español (es)" {
+		langCode = "es"
+	}
+
+	if langCode != currentLanguage {
+		err := config.SetLanguage(langCode)
+		if err != nil {
+			fmt.Printf("Error setting language: %v\n", err)
+			return
+		}
+		fmt.Printf("Language set to: %s\n", langCode)
+	}
+
 	// API key configuration - skip for copilot and anthropic
 	if selectedProvider != "copilot" && selectedProvider != "anthropic" {
 		apiKeyPrompt := &survey.Input{

internal/config/config.go

@@ -23,6 +23,7 @@ type ProviderConfig struct {
 type Config struct {
 	Providers      map[string]ProviderConfig `mapstructure:"providers"`
 	ActiveProvider string                    `mapstructure:"active_provider"`
+	Language       string                    `mapstructure:"language"`
 }
 
 var cfg *Config
@@ -46,6 +47,9 @@ func InitConfig() {
 	viper.SetDefault("providers.anthropic.model", "claude-haiku-4-5")
 	viper.SetDefault("providers.anthropic.num_suggestions", 10)
 
+	// Set default language
+	viper.SetDefault("language", "en")
+
 	viper.AutomaticEnv()
 
 	if err := viper.ReadInConfig(); err != nil {
@@ -286,6 +290,25 @@ func SetNumSuggestions(provider, numSuggestions string) error {
 	return viper.WriteConfig()
 }
 
+func GetLanguage() string {
+	if cfg == nil {
+		InitConfig()
+	}
+	if cfg.Language == "" {
+		return "en" // Default to English
+	}
+	return cfg.Language
+}
+
+func SetLanguage(language string) error {
+	if cfg == nil {
+		InitConfig()
+	}
+	cfg.Language = language
+	viper.Set("language", language)
+	return viper.WriteConfig()
+}
+
 func getConfigDir() string {
 	if xdgConfig := os.Getenv("XDG_CONFIG_HOME"); xdgConfig != "" {
 		return xdgConfig

internal/config/prompts.go

@@ -100,9 +100,21 @@ func GetSystemMessageFromConfig() string {
 // GetCommitMessagePromptFromConfig returns the commit message prompt from configuration
 func GetCommitMessagePromptFromConfig(diff string) string {
 	config := GetPromptConfig()
+	var basePrompt string
 	if config.CommitMessageTemplate != "" {
-		return fmt.Sprintf(config.CommitMessageTemplate, diff)
+		basePrompt = fmt.Sprintf(config.CommitMessageTemplate, diff)
+	} else {
+		// Fallback to hardcoded default
+		basePrompt = fmt.Sprintf("Based on the following git diff, generate 10 conventional commit messages. Each message should be on a new line, without any numbering or bullet points:\n\n%s", diff)
 	}
-	// Fallback to hardcoded default
-	return fmt.Sprintf("Based on the following git diff, generate 10 conventional commit messages. Each message should be on a new line, without any numbering or bullet points:\n\n%s", diff)
+
+	// Add language instruction based on configuration
+	language := GetLanguage()
+	if language == "es" {
+		basePrompt += "\n\nIMPORTANT: Generate all commit messages in Spanish."
+	} else if language == "en" {
+		basePrompt += "\n\nIMPORTANT: Generate all commit messages in English."
+	}
+
+	return basePrompt
 }