feat: add language support for commit message generation

- Introduced a `--language` flag to specify the language for commit
  message generation in the CLI.
- Updated `cobra` integration to handle the new `--language` flag.
- Modified `GenerateCommitMessage` to accept a language parameter and
  default to the language specified in the prompt configuration.
- Updated the prompt configuration to include a `language` field with
  a default value of "english".
- Enhanced template variable replacement to support dynamic language
  selection.

- Added `format` and `lint` tasks to the `Justfile` for code formatting
  and linting.
- Updated `README.md` with usage instructions for the `--language` flag.
- Added new dependencies (`cobra`, `pflag`, and others) to `go.mod` and
  `go.sum`.

Author: hazadus

Justfile

@@ -2,4 +2,10 @@ run:
   go run cmd/commitmsg/main.go
 
 build:
-  go build -o ./bin/commitmsg cmd/commitmsg/main.go
+  go build -o ./bin/commitmsg cmd/commitmsg/main.go
+
+format:
+  go fmt ./...
+
+lint:
+  golangci-lint run ./...

README.md

@@ -4,4 +4,10 @@ Tool idea:
 - get staged changes in the git repository in the current directory
 - feed the obtained data to the GitHub Models LLM to generate a conventional commit message
 - display the generated commit message on the screen
-- if it works well, we can provide several previous commit messages as examples for the model
+- if it works well, we can provide several previous commit messages as examples for the model
+
+## Usage
+
+```bash
+commitmsg --language russian
+```

cmd/commitmsg/main.go

@@ -7,33 +7,54 @@ import (
 
 	"github.com/hazadus/gh-commitmsg/internal/git"
 	"github.com/hazadus/gh-commitmsg/internal/llm"
+	"github.com/spf13/cobra"
 )
 
+const extensionName = "standup"
+
+var (
+	flagLanguage string
+)
+var rootCmd = &cobra.Command{
+	Use:   extensionName,
+	Short: "Generate AI-powered commit messages",
+	Long:  "A GitHub CLI extension that generates commit messages using GitHub Models and git repo data",
+	RunE:  runCommitMsg,
+}
+
+func init() {
+	rootCmd.Flags().StringVarP(&flagLanguage, "language", "l", "english", "Language to generate commit message in")
+}
+
 func main() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func runCommitMsg(_ *cobra.Command, _ []string) error {
 	stagedChanges, err := git.GetStagedChanges()
 	if err != nil {
-		fmt.Printf("Error retrieving staged changes: %v\n", err)
-		os.Exit(1)
+		return fmt.Errorf("failed to get staged changes: %w", err)
 	}
 
 	if stagedChanges == "" {
 		fmt.Println("No staged changes in the repository.")
-		return
+		return nil
 	}
 
 	llmClient, err := llm.NewClient()
 	if err != nil {
-		fmt.Printf("Error creating LLM client: %v\n", err)
-		os.Exit(1)
+		return fmt.Errorf("failed to create LLM client: %w", err)
 	}
 
-	commitMsg, err := llmClient.GenerateCommitMessage(stagedChanges)
+	commitMsg, err := llmClient.GenerateCommitMessage(stagedChanges, flagLanguage)
 	if err != nil {
-		fmt.Printf("Error generating commit message: %v\n", err)
-		os.Exit(1)
+		return fmt.Errorf("failed to generate commit message: %w", err)
 	}
 
 	fmt.Println("Generated commit message:")
 	fmt.Println(commitMsg)
+	return nil
 }
-

go.mod

@@ -4,10 +4,13 @@ go 1.23.4
 
 require (
 	github.com/cli/go-gh/v2 v2.12.1
+	github.com/spf13/cobra v1.9.1
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
 	github.com/cli/safeexec v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/kr/pretty v0.3.1 // indirect
+	github.com/spf13/pflag v1.0.6 // indirect
 )

go.sum

@@ -2,9 +2,12 @@ github.com/cli/go-gh/v2 v2.12.1 h1:SVt1/afj5FRAythyMV3WJKaUfDNsxXTIe7arZbwTWKA=
 github.com/cli/go-gh/v2 v2.12.1/go.mod h1:+5aXmEOJsH9fc9mBHfincDwnS02j2AIA/DsTH0Bk5uw=
 github.com/cli/safeexec v1.0.0 h1:0VngyaIyqACHdcMNWfo6+KdUYnqEr2Sg+bSP1pdF+dI=
 github.com/cli/safeexec v1.0.0/go.mod h1:Z/D4tTN8Vs5gXYHDCbaM1S/anmEDnJb1iW0+EJ5zx3Q=
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
@@ -14,6 +17,11 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
 github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.9.1 h1:CXSaggrXdbHK9CF+8ywj8Amf7PBRmPCOJugH954Nnlo=
+github.com/spf13/cobra v1.9.1/go.mod h1:nDyEzZ8ogv936Cinf6g1RU9MRY64Ir93oCnqb9wxYW0=
+github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
+github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

internal/git/git.go

@@ -28,4 +28,4 @@ func isGitRepository() bool {
 	cmd := exec.Command("git", "rev-parse", "--is-inside-work-tree")
 	err := cmd.Run()
 	return err == nil
-}
+}

internal/llm/client.go

@@ -24,6 +24,7 @@ type PromptConfig struct {
 	Name            string          `yaml:"name"`
 	Description     string          `yaml:"description"`
 	Model           string          `yaml:"model"`
+	Language        string          `yaml:"language"`
 	ModelParameters ModelParameters `yaml:"modelParameters"`
 	Messages        []PromptMessage `yaml:"messages"`
 }
@@ -87,7 +88,7 @@ func NewClient() (*Client, error) {
 }
 
 // GenerateCommitMessage generates a commit message based on the provided changes summary
-func (c *Client) GenerateCommitMessage(changesSummary string) (string, error) {
+func (c *Client) GenerateCommitMessage(changesSummary string, language string) (string, error) {
 	fmt.Print("  Loading prompt configuration... ")
 	promptConfig, err := loadPromptConfig()
 	if err != nil {
@@ -97,13 +98,18 @@ func (c *Client) GenerateCommitMessage(changesSummary string) (string, error) {
 	fmt.Println("Done")
 
 	selectedModel := promptConfig.Model
+	selectedLanguage := language
+	if selectedLanguage == "" {
+		selectedLanguage = promptConfig.Language
+	}
 
 	// Build messages from the prompt config, replacing template variables
 	messages := make([]Message, len(promptConfig.Messages))
 	for i, msg := range promptConfig.Messages {
 		content := msg.Content
-		// Replace the {{changes}} template variable
+		// Replace the template variables
 		content = strings.ReplaceAll(content, "{{changes}}", changesSummary)
+		content = strings.ReplaceAll(content, "{{language}}", selectedLanguage)
 
 		messages[i] = Message{
 			Role:    msg.Role,

internal/llm/commitmsg.prompt.yml

@@ -1,6 +1,7 @@
 name: Commit Message Generator
 description: Generates professional commit messages based on git changes
 model: openai/gpt-4o
+language: english
 messages:
   - role: system
     content: >
@@ -10,6 +11,8 @@ messages:
       follows "conventional commits" style. The message should be clear,
       informative, and suitable for a professional software development context.
 
+      Write in {{language}} language.
+
       Guidelines:
 
       - Keep it professional but conversational