feat: Add verbose mode for debugging LLM prompts

This commit introduces a verbose mode that displays the prompt sent to the LLM, the context used, and the git diff. This is useful for debugging and understanding how the LLM generates commit messages.

src/main.rs

@@ -123,6 +123,10 @@ struct Cli {
     /// Display help information
     #[arg(long = "help")]
     help: bool,
+
+    /// Display verbose information
+    #[arg(long = "verbose")]
+    verbose: bool,
 }
 
 /// Increment version string (e.g., "0.0.37" -> "0.0.38")
@@ -600,11 +604,22 @@ async fn setup_openrouter_provider() -> Result<OpenRouterConfig, String> {
     })
 }
 
-async fn generate_openrouter_commit_message(config: &OpenRouterConfig, diff: &str) -> Result<(String, UsageInfo), String> {
+async fn generate_openrouter_commit_message(config: &OpenRouterConfig, diff: &str, cli: &Cli) -> Result<(String, UsageInfo), String> {
     let client = reqwest::Client::new();
 
     let prompt = format!("Here is the git diff, please generate a concise and descriptive commit message:\n\n{}", diff);
 
+    // Show context in verbose mode
+    if cli.verbose {
+        println!("\n=== Context for LLM ===");
+        println!("Provider: OpenRouter");
+        println!("Model: {}", config.model);
+        println!("Max tokens: {}", config.max_tokens);
+        println!("Temperature: {}", config.temperature);
+        println!("\n=== Prompt ===\n{}", prompt);
+        println!("\n=== Sending request to API ===");
+    }
+
     let request_body = json!({
         "model": &config.model,
         "messages": [
@@ -655,9 +670,23 @@ async fn generate_openrouter_commit_message(config: &OpenRouterConfig, diff: &st
     Ok((message, usage))
 }
 
-async fn generate_ollama_commit_message(config: &OllamaConfig, diff: &str) -> Result<(String, UsageInfo), String> {
+async fn generate_ollama_commit_message(config: &OllamaConfig, diff: &str, cli: &Cli) -> Result<(String, UsageInfo), String> {
     let client = reqwest::Client::new();
 
+    let prompt = format!("Write a clear and concise git commit message (one line, no technical terms) that describes these changes:\n\n{}", diff);
+
+    // Show context in verbose mode
+    if cli.verbose {
+        println!("\n=== Context for LLM ===");
+        println!("Provider: Ollama");
+        println!("Model: {}", config.model);
+        println!("URL: {}", config.url);
+        println!("Max tokens: {}", config.max_tokens);
+        println!("Temperature: {}", config.temperature);
+        println!("\n=== Prompt ===\n{}", prompt);
+        println!("\n=== Sending request to API ===");
+    }
+
     let request_body = serde_json::json!({
         "model": config.model,
         "prompt": format!("Write a clear and concise git commit message (one line, no technical terms) that describes these changes:\n\n{}", diff),
@@ -782,11 +811,23 @@ async fn setup_openai_compatible_provider() -> Result<OpenAICompatibleConfig, St
     })
 }
 
-async fn generate_openai_compatible_commit_message(config: &OpenAICompatibleConfig, diff: &str) -> Result<(String, UsageInfo), String> {
+async fn generate_openai_compatible_commit_message(config: &OpenAICompatibleConfig, diff: &str, cli: &Cli) -> Result<(String, UsageInfo), String> {
     let client = reqwest::Client::new();
 
     let prompt = format!("Here is the git diff, please generate a concise and descriptive commit message:\n\n{}", diff);
 
+    // Show context in verbose mode
+    if cli.verbose {
+        println!("\n=== Context for LLM ===");
+        println!("Provider: OpenAI Compatible");
+        println!("Model: {}", config.model);
+        println!("API URL: {}", config.api_url);
+        println!("Max tokens: {}", config.max_tokens);
+        println!("Temperature: {}", config.temperature);
+        println!("\n=== Prompt ===\n{}", prompt);
+        println!("\n=== Sending request to API ===");
+    }
+
     let request_body = json!({
         "model": &config.model,
         "messages": [
@@ -1165,6 +1206,11 @@ async fn run_commit(config: &Config, cli: &Cli) -> Result<(), String> {
     // Get the diff (will handle git add if needed)
     let diff = get_git_diff(cli)?;
 
+    // Show diff in verbose mode
+    if cli.verbose {
+        println!("\n=== Git Diff ===\n{}", diff);
+    }
+
     // Generate commit message based on the active provider
     let (message, usage_info) = {
         let active_provider = config.providers.iter().find(|p| match p {
@@ -1174,9 +1220,9 @@ async fn run_commit(config: &Config, cli: &Cli) -> Result<(), String> {
         }).ok_or("No active provider found")?;
 
         match active_provider {
-            ProviderConfig::OpenRouter(c) => generate_openrouter_commit_message(c, &diff).await?,
-            ProviderConfig::Ollama(c) => generate_ollama_commit_message(c, &diff).await?,
-            ProviderConfig::OpenAICompatible(c) => generate_openai_compatible_commit_message(c, &diff).await?,
+            ProviderConfig::OpenRouter(c) => generate_openrouter_commit_message(c, &diff, cli).await?,
+            ProviderConfig::Ollama(c) => generate_ollama_commit_message(c, &diff, cli).await?,
+            ProviderConfig::OpenAICompatible(c) => generate_openai_compatible_commit_message(c, &diff, cli).await?,
         }
     };