feat(cli): add strict mode (#3384)

@commitlint/cli/fixtures/warning/commitlint.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+    rules: {
+        'type-enum': [2, 'always', ['feat']],
+        'subject-max-length': [1, 'always', 4]
+    }
+};

@commitlint/cli/src/cli-error.ts

@@ -2,11 +2,13 @@ export class CliError extends Error {
 	__proto__ = Error;
 
 	public type: string;
+	public error_code: number;
 
-	constructor(message: string, type: string) {
+	constructor(message: string, type: string, error_code = 1) {
 		super(message);
 
 		this.type = type;
+		this.error_code = error_code;
 
 		Object.setPrototypeOf(this, CliError.prototype);
 	}

@commitlint/cli/src/cli.test.ts

@@ -482,6 +482,24 @@ test('should work with relative formatter path', async () => {
 	expect(actual.exitCode).toBe(0);
 });
 
+test('strict: should exit with 3 on error', async () => {
+	const cwd = await gitBootstrap('fixtures/warning');
+	const actual = await cli(['--strict'], {cwd})('foo: abcdef');
+	expect(actual.exitCode).toBe(3);
+});
+
+test('strict: should exit with 2 on warning', async () => {
+	const cwd = await gitBootstrap('fixtures/warning');
+	const actual = await cli(['--strict'], {cwd})('feat: abcdef');
+	expect(actual.exitCode).toBe(2);
+});
+
+test('strict: should exit with 0 on success', async () => {
+	const cwd = await gitBootstrap('fixtures/warning');
+	const actual = await cli(['--strict'], {cwd})('feat: abc');
+	expect(actual.exitCode).toBe(0);
+});
+
 test('should print help', async () => {
 	const cwd = await gitBootstrap('fixtures/default');
 	const actual = await cli(['--help'], {cwd})();
@@ -507,7 +525,7 @@ test('should print help', async () => {
 		  -f, --from           lower end of the commit range to lint; applies if
 		                       edit=false                                       [string]
 		      --git-log-args   addditional git log arguments as space separated string,
-		                       example \'--first-parent --cherry-pick\'           [string]
+		                       example '--first-parent --cherry-pick'           [string]
 		  -o, --format         output format of the results                     [string]
 		  -p, --parser-preset  configuration preset to use for
 		                       conventional-commits-parser                      [string]
@@ -516,6 +534,8 @@ test('should print help', async () => {
 		                       edit=false                                       [string]
 		  -V, --verbose        enable verbose output for reports without problems
 		                                                                       [boolean]
+		  -s, --strict         enable strict mode; result code 2 for warnings, 3 for
+		                       errors                                          [boolean]
 		  -v, --version        display version information                     [boolean]
 		  -h, --help           Show help                                       [boolean]"
 	`);

@commitlint/cli/src/cli.ts

@@ -110,6 +110,12 @@ const cli = yargs
 			type: 'boolean',
 			description: 'enable verbose output for reports without problems',
 		},
+		strict: {
+			alias: 's',
+			type: 'boolean',
+			description:
+				'enable strict mode; result code 2 for warnings, 3 for errors',
+		},
 	})
 	.version(
 		'version',
@@ -128,7 +134,7 @@ const cli = yargs
 main(cli.argv).catch((err) => {
 	setTimeout(() => {
 		if (err.type === pkg.name) {
-			process.exit(1);
+			process.exit(err.error_code);
 		}
 		throw err;
 	}, 0);
@@ -160,7 +166,7 @@ async function resolveArgs(args: MainArgs): Promise<MainArgsObject> {
 	return typeof args.then === 'function' ? await args : args;
 }
 
-async function main(args: MainArgs) {
+async function main(args: MainArgs): Promise<void> {
 	const options = await resolveArgs(args);
 	if (typeof options.edit === 'undefined') {
 		options.edit = false;
@@ -314,6 +320,14 @@ async function main(args: MainArgs) {
 		console.log(output);
 	}
 
+	if (flags.strict) {
+		if (report.errorCount > 0) {
+			throw new CliError(output, pkg.name, 3);
+		}
+		if (report.warningCount > 0) {
+			throw new CliError(output, pkg.name, 2);
+		}
+	}
 	if (!report.valid) {
 		throw new CliError(output, pkg.name);
 	}

@commitlint/cli/src/types.ts

@@ -16,6 +16,7 @@ export interface CliFlags {
 	version?: boolean;
 	verbose?: boolean;
 	'print-config'?: boolean;
+	strict?: boolean;
 	_: (string | number)[];
 	$0: string;
 }