feat: git hook (#95)

src/commands/hook.ts

@@ -0,0 +1,59 @@
+import fs from 'fs/promises';
+import path from 'path';
+import { fileURLToPath } from 'url';
+import { green, red } from 'kolorist';
+import { command } from 'cleye';
+import { assertGitRepo } from '../utils/git.js';
+import { fileExists } from '../utils/fs.js';
+
+export default command({
+	name: 'hook',
+	parameters: ['<install/uninstall>'],
+}, (argv) => {
+	const hookPath = fileURLToPath(new URL('test.mjs', import.meta.url));
+	const hookName = 'prepare-commit-msg';
+	const symlinkPath = `.git/hooks/${hookName}`;
+
+	(async () => {
+		await assertGitRepo();
+
+		const { installUninstall } = argv._;
+
+		const hookExists = await fileExists(symlinkPath);
+		if (installUninstall === 'install') {
+			if (hookExists) {
+				const realpath = await fs.realpath(symlinkPath);
+				if (realpath === hookPath)	{
+					throw new Error('The hook is already installed');
+				} else {
+					throw new Error(`A different ${hookName} hook seems to be installed. Please remove it before installing aicommits.`);
+				}
+			}
+
+			await fs.mkdir(path.dirname(symlinkPath), { recursive: true });
+			await fs.symlink(hookPath, symlinkPath, 'file');
+			await fs.chmod(symlinkPath, 0o755);
+			console.log(`${green('✔')} Hook installed`);
+			return;
+		}
+
+		if (installUninstall === 'uninstall') {
+			if (!hookExists) {
+				throw new Error('Hook is not installed');
+			}
+			const realpath = await fs.realpath(symlinkPath);
+			if (realpath !== hookPath) {
+				throw new Error('Hook is not installed');
+			}
+
+			await fs.rm(symlinkPath);
+			console.log(`${green('✔')} Hook uninstalled`);
+			return;
+		}
+
+		throw new Error(`Invalid mode: ${installUninstall}`);
+	})().catch((error) => {
+		console.error(`${red('✖')} ${error.message}`);
+		process.exit(1); // eslint-disable-line unicorn/no-process-exit
+	});
+});