commit.ts

#!/usr/bin/env bun

import { $ } from "bun";

const prompt =
  "Generate a concise Git commit message for the staged diff. Plain text only. Imperative subject; body only if useful.";

async function main(): Promise<0 | 1> {
  await $`git add -A -- .`;

  const diff = await $`git diff --cached --no-ext-diff --no-color`.text();

  if (diff.length === 0) {
    console.error("No changes to commit after git add -A.");
    return 1;
  }

  console.log("Generating commit msg...");
  const message =
    await $`${import.meta.dir}/gpt.ts -m gpt-5.3-codex-spark -c model_reasoning_effort=low ${prompt} < ${new Response(diff)}`.text();

  if (message.trim().length === 0) {
    console.error("Codex produced an empty commit message.");
    return 1;
  }

  console.log(`Commit message:\n${message.trimEnd()}\n`);

  await $`git commit -F - < ${new Response(message)}`;
  return 0;
}

if (import.meta.main) {
  process.exit(await main());
}