refactor(prompts): extract prompt templates to dedicated module

src/index.ts

@@ -6,6 +6,7 @@ import { streamText } from "ai";
 import { initConfig, loadConfig } from "./config";
 import { Conversation } from "./conversation";
 import { handleTopLevel } from "./errors";
+import { Prompts } from "./prompts";
 import Renderer from "./render";
 
 async function main() {
@@ -73,21 +74,10 @@ async function main() {
 
   let prompt = "Introduce yourself.";
   const input = positionals.join(" ").trim();
-  if (messageFlag) {
-    prompt = `\`\`\`diff
-${input}
-\`\`\`
+  if (messageFlag) prompt = Prompts.commit(input);
+  else if (reviewFlag) prompt = Prompts.review(input);
+  else if (input) prompt = input;
 
-Generate a conventional commit message for this diff. If you are unable to generate a reasonable option, ask for more context.`;
-  } else if (reviewFlag) {
-    prompt = `\`\`\`diff
-${input}
-\`\`\`
-
-Review the above diff for any potential bugs, best practices, performance issues, or security flaws. Let me know if you need any more context to compelete your review.`;
-  } else if (input) {
-    prompt = input;
-  }
   convo.messages.push({ role: "user", content: prompt });
 
   const { fullStream, text, totalUsage } = streamText({