feat(commitmsg): add support for custom AI model selection

- Introduced `--model` flag to specify AI model for commit message generation
- Updated `GenerateCommitMessage` function to accept model parameter
- Removed hardcoded `model` and `language` fields from `commitmsg.prompt.yml`
- Enhanced README with examples for using the new `--model` flag

Author: hazadus

README.md

@@ -43,12 +43,17 @@ gh commitmsg
 
 ### Advanced Options
 
+You can use and combine different options:
+
 ```bash
 # Use different language
 gh commitmsg --language russian
 
 # Use previous 3 commit messages as an example for LLM
 gh commitmsg --examples
+
+# Use a different AI model
+gh standup --model xai/grok-3-mini
 ```
 
 ### Output examples

cmd/commitmsg/main.go

@@ -15,6 +15,7 @@ const extensionName = "commitmsg"
 var (
 	flagLanguage string
 	flagExamples bool
+	flagModel string
 )
 var rootCmd = &cobra.Command{
 	Use:   extensionName,
@@ -26,6 +27,7 @@ var rootCmd = &cobra.Command{
 func init() {
 	rootCmd.Flags().StringVarP(&flagLanguage, "language", "l", "english", "Language to generate commit message in")
 	rootCmd.Flags().BoolVarP(&flagExamples, "examples", "e", false, "Add examples of commit messages to context")
+	rootCmd.Flags().StringVarP(&flagModel, "model", "m", "openai/gpt-4o", "GitHub Models model to use")
 }
 
 func main() {
@@ -61,7 +63,7 @@ func runCommitMsg(_ *cobra.Command, _ []string) error {
 	}
 
 	fmt.Println("  Language for commit message:", flagLanguage)
-	commitMsg, err := llmClient.GenerateCommitMessage(stagedChanges, flagLanguage, latestCommitMessages)
+	commitMsg, err := llmClient.GenerateCommitMessage(stagedChanges, flagModel, flagLanguage, latestCommitMessages)
 	if err != nil {
 		return fmt.Errorf("failed to generate commit message: %w", err)
 	}

internal/llm/client.go

@@ -23,8 +23,6 @@ var commitmsgPromptYAML []byte
 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"`
 }
@@ -90,6 +88,7 @@ func NewClient() (*Client, error) {
 // GenerateCommitMessage generates a commit message based on the provided changes summary
 func (c *Client) GenerateCommitMessage(
 	changesSummary string,
+	model string,
 	language string,
 	examples string,
 ) (string, error) {
@@ -101,11 +100,8 @@ func (c *Client) GenerateCommitMessage(
 	}
 	fmt.Println("Done")
 
-	selectedModel := promptConfig.Model
+	selectedModel := model
 	selectedLanguage := language
-	if selectedLanguage == "" {
-		selectedLanguage = promptConfig.Language
-	}
 
 	// Build messages from the prompt config, replacing template variables
 	messages := make([]Message, len(promptConfig.Messages))

internal/llm/commitmsg.prompt.yml

@@ -1,7 +1,5 @@
 name: Commit Message Generator
 description: Generates professional commit messages based on git changes
-model: openai/gpt-4o
-language: english
 messages:
   - role: system
     content: >