Respect newlines and tabs in replacement string (#3)

Author: ritazoliveira

api.js

@@ -26,6 +26,12 @@ module.exports = async (filePaths, {find, replacement, ignoreCase} = {}) => {
 		throw new Error('The `replacement` option is required');
 	}
 
+	// Replace the replacement string with the string unescaped (only one backslash) if it's escaped
+	replacement = replacement
+		.replace(/\\n/g, '\n')
+		.replace(/\\r/g, '\r')
+		.replace(/\\t/g, '\t');
+
 	// Deduplicate
 	filePaths = [...new Set(filePaths.map(filePath => path.resolve(filePath)))];
 

test.js

@@ -14,3 +14,23 @@ test('--regex', async t => {
 	await execa('./cli.js', ['--regex=\\bb.*?\\b', '--replacement=foo', filePath]);
 	t.is(fs.readFileSync(filePath, 'utf8'), 'foo foo foo');
 });
+
+test('newlines and tabs', async t => {
+	const filePath = await tempWrite('a,b,c');
+	await execa('./cli.js', ['--string=,', '--replacement=\\n', filePath]);
+	t.is(fs.readFileSync(filePath, 'utf8'), 'a\nb\nc');
+
+	const filePath2 = await tempWrite('a,b,c');
+	await execa('./cli.js', ['--string=,', '--replacement=\\t', filePath2]);
+	t.is(fs.readFileSync(filePath2, 'utf8'), 'a\tb\tc');
+
+	const filePath3 = await tempWrite('a,b,c');
+	await execa('./cli.js', ['--string=,', '--replacement=\\r', filePath3]);
+	t.is(fs.readFileSync(filePath3, 'utf8'), 'a\rb\rc');
+});
+
+test('multiple newlines and tabs', async t => {
+	const filePath = await tempWrite('a,b,c');
+	await execa('./cli.js', ['--string=,', '--replacement=\\n\\n\\t\\r', filePath]);
+	t.is(fs.readFileSync(filePath, 'utf8'), 'a\n\n\t\rb\n\n\t\rc');
+});