rename-extensions.js

const fs = require('fs');
const path = require('path');

// Get command line arguments
const [oldExt, newExt, targetDir] = process.argv.slice(2);

if (!oldExt || !newExt) {
	console.error(
		'Usage: node rename-extensions.js <old-extension> <new-extension> [directory]',
	);
	console.error('Example: node rename-extensions.js jsx tsx ./src');
	console.error(
		'Note: If directory is not specified, current directory will be used',
	);
	process.exit(1);
}

// Use provided directory or fallback to current directory
const startDirectory = targetDir ? path.resolve(targetDir) : process.cwd();

// Verify the directory exists
if (!fs.existsSync(startDirectory)) {
	console.error(`Error: Directory "${startDirectory}" does not exist`);
	process.exit(1);
}

// Function to rename files
function renameFiles(directory) {
	fs.readdirSync(directory).forEach((file) => {
		const fullPath = path.join(directory, file);

		// Check if it's a directory
		if (fs.statSync(fullPath).isDirectory()) {
			renameFiles(fullPath); // Recurse into subdirectories
			return;
		}

		// Check if file ends with the old extension
		if (file.endsWith(`.${oldExt}`)) {
			// Handle both file.ext and file.something.ext patterns
			const newName = file.slice(0, -oldExt.length) + newExt;
			const newPath = path.join(directory, newName);

			fs.renameSync(fullPath, newPath);
			// Show relative path from starting directory
			const relativePath = path.relative(startDirectory, directory);
			const location = relativePath ? `${relativePath}/` : '';
			console.log(`Renamed: ${location}${file} → ${newName}`);
		}
	});
}

// Start renaming from specified directory
try {
	console.log(`Starting in directory: ${startDirectory}`);
	renameFiles(startDirectory);
	console.log('Done!');
} catch (error) {
	console.error('Error:', error.message);
}