feat(#4): Refactor AnthropicClient and add system prompt

- Add `systemPrompt` parameter to `createMessage` method in `AnthropicClient`
  * Allows setting a system prompt for the Anthropic API
  * System prompt is used to provide context for the AI model
- Update `analyzeCommitStyle` function to accept an optional `systemPrompt` parameter
  * Passes the system prompt to the `createMessage` method of `AnthropicClient`
  * Allows customizing the system prompt for the commit style analysis

BREAKING CHANGE: The `createMessage` method in `AnthropicClient` now requires a `systemPrompt` parameter.

Author: sidedwards

src/ai/anthropicClient.ts

@@ -7,13 +7,14 @@ export class AnthropicClient {
         this.apiKey = apiKey;
     }
 
-    async createMessage(content: string, model: string = "claude-3-haiku-20240307"): Promise<string> {
+    async createMessage(systemPrompt: string, content: string, model: string = "claude-3-haiku-20240307"): Promise<string> {
         const anthropic = new Anthropic({ apiKey: this.apiKey });
 
         const msg = await anthropic.messages.create({
             model,
             max_tokens: 1024,
             temperature: 0,
+            system: systemPrompt,
             messages: [{ role: "user", content }],
         });
 

src/ai/commitStyleAnalyzer.ts

@@ -1,6 +1,6 @@
 import { AnthropicClient } from "./anthropicClient.ts";
 
-export async function analyzeCommitStyle(commits: string, apiKey: string): Promise<string> {
+export async function analyzeCommitStyle(systemPrompt: string = `You are an expert in git commit message styling and formatting.`, commits: string, apiKey: string): Promise<string> {
     const client = new AnthropicClient(apiKey);
     const content = `Extract commit message rules from these commits. Create a minimal style guide that:
 
@@ -16,5 +16,5 @@ Analyze these commits:
 
 ${commits}`;
 
-    return await client.createMessage(content);
-}
+    return await client.createMessage(systemPrompt, content);
+}

src/ai/getCommitMessage.ts

@@ -38,17 +38,18 @@ Include the issue ID as a reference according to the commit message format.`;
         const client = new AnthropicClient(apiKey);
 
         const content = await client.createMessage(
+            systemPrompt || `You are an expert in git commit message styling and formatting.`,
             `Generate a commit message summarizing ALL key changes from the ENTIRE diff:\n\n${diff}\n\nIMPORTANT: 
 1. Do not include any explanatory text or formatting
-2. Do not make up features, changes, or issue numbers not present in the diff
-3. Do not repeat the header line
-4. IMPORTANT: NEVER include the diff in the response
-5. Do not include "diff --git" or any git output
-6. Follow this exact structure:
+2. Do not repeat the header line
+3. IMPORTANT: NEVER include the diff in the response
+4. Do not include "diff --git" or any git output
+5. Follow this exact structure:
    - One header line
    - One blank line
    - Bullet points for actual changes
-   - Breaking changes (if any)`);
+   - Breaking changes (if any)
+6. Do not make up features, changes, or issue numbers not present in the diff`);
 
         // Post-process the message to ensure proper formatting
         const lines = content.split('\n').filter(line => line.trim() !== '');

src/gh/ghOps.ts

@@ -74,7 +74,7 @@ export async function searchAndSelectIssue(): Promise<{ number: number, title: s
     }
 
     console.log(`\n${COLORS.header("Found issues:")}`);
-    console.log('┌──────┬────��───┬──────────────────────────────────────────────────────────┐');
+    console.log('┌──────┬────────┬──────────────────────────────────────────────────────────┐');
     console.log('│ Sel# │ ID     │ Title                                                    │');
     console.log('├──────┼────────┼──────────────────────────────────────────────────────────┤');