fix: ignore empty commit messages conventional-changelog#615

bypass rules for completely empty commit messages (only of blank
lines/comments in message)

@commitlint/lint/src/index.js

@@ -28,6 +28,19 @@ export default async (message, rules = {}, opts = {}) => {
 
 	// Parse the commit message
 	const parsed = await parse(message, undefined, opts.parserOpts);
+	if (
+		parsed.header === null &&
+		parsed.body === null &&
+		parsed.footer === null
+	) {
+		// Commit is empty, skip
+		return {
+			valid: true,
+			errors: [],
+			warnings: [],
+			input: message
+		};
+	}
 
 	const mergedImplementations = Object.assign({}, implementations);
 	if (opts.plugins) {

@commitlint/lint/src/index.test.js

@@ -66,6 +66,37 @@ test('positive on custom ignored message and broken rule', async t => {
 	t.is(actual.input, ignoredMessage);
 });
 
+test('positive on comment-only commit message', async t => {
+	const actual = await lint(
+		// '# This is empty\n#This is also a comment',
+		'# comment!',
+		{
+			'header-max-length': [2, 'always', 72]
+		},
+		{
+			parserOpts: {
+				commentChar: '#'
+			}
+		}
+	);
+	t.true(actual.valid);
+});
+
+test('positive on blank lines and comment commit message', async t => {
+	const actual = await lint(
+		'\n# Comment\n# Another comment\n',
+		{
+			'header-max-length': [2, 'always', 72]
+		},
+		{
+			parserOpts: {
+				commentChar: '#'
+			}
+		}
+	);
+	t.true(actual.valid);
+});
+
 test('positive on stub message and opts', async t => {
 	const actual = await lint(
 		'foo-bar',