From 72496eb52fe681b87f838d4973b1bba23f4dee38 Mon Sep 17 00:00:00 2001
From: Cedric van Putten <me@bycedric.com>
Date: Fri, 25 Jan 2019 01:50:28 +0100
Subject: [PATCH] feat: create header-case rule

---
 @commitlint/rules/src/header-case.js      |  34 +++
 @commitlint/rules/src/header-case.test.js | 344 ++++++++++++++++++++++
 @commitlint/rules/src/index.js            |   1 +
 3 files changed, 379 insertions(+)
 create mode 100644 @commitlint/rules/src/header-case.js
 create mode 100644 @commitlint/rules/src/header-case.test.js

diff --git a/@commitlint/rules/src/header-case.js b/@commitlint/rules/src/header-case.js
new file mode 100644
index 00000000000..779f4a5e97c
--- /dev/null
+++ b/@commitlint/rules/src/header-case.js
@@ -0,0 +1,34 @@
+import * as ensure from '@commitlint/ensure';
+import message from '@commitlint/message';
+
+const negated = when => when === 'never';
+
+export default (parsed, when, value) => {
+	const {header} = parsed;
+
+	if (typeof header !== 'string' || !header.match(/^[a-z]/i)) {
+		return [true];
+	}
+
+	const checks = (Array.isArray(value) ? value : [value]).map(check => {
+		if (typeof check === 'string') {
+			return {
+				when: 'always',
+				case: check
+			};
+		}
+		return check;
+	});
+
+	const result = checks.some(check => {
+		const r = ensure.case(header, check.case);
+		return negated(check.when) ? !r : r;
+	});
+
+	const list = checks.map(c => c.case).join(', ');
+
+	return [
+		negated(when) ? !result : result,
+		message([`header must`, negated(when) ? `not` : null, `be ${list}`])
+	];
+};
diff --git a/@commitlint/rules/src/header-case.test.js b/@commitlint/rules/src/header-case.test.js
new file mode 100644
index 00000000000..cbb8473870a
--- /dev/null
+++ b/@commitlint/rules/src/header-case.test.js
@@ -0,0 +1,344 @@
+import test from 'ava';
+import parse from '@commitlint/parse';
+import headerCase from './header-case';
+
+const messages = {
+	empty: '\n',
+	numeric: '1.0.0',
+	lowercase: 'header test',
+	mixedcase: 'hEaDeR tEsT',
+	uppercase: 'HEADER TEST',
+	camelcase: 'heaDer teSt',
+	kebabcase: 'hea-der te-st',
+	pascalcase: 'HeaDer TeSt',
+	snakecase: 'hea_der te_st',
+	startcase: 'Hea Der Te St'
+};
+
+const parsed = {
+	empty: parse(messages.empty),
+	numeric: parse(messages.numeric),
+	lowercase: parse(messages.lowercase),
+	mixedcase: parse(messages.mixedcase),
+	uppercase: parse(messages.uppercase),
+	camelcase: parse(messages.camelcase),
+	kebabcase: parse(messages.kebabcase),
+	pascalcase: parse(messages.pascalcase),
+	snakecase: parse(messages.snakecase),
+	startcase: parse(messages.startcase)
+};
+
+test('with empty header should succeed for "never lowercase"', async t => {
+	const [actual] = headerCase(await parsed.empty, 'never', 'lowercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with empty header should succeed for "always lowercase"', async t => {
+	const [actual] = headerCase(await parsed.empty, 'always', 'lowercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with empty header should succeed for "never uppercase"', async t => {
+	const [actual] = headerCase(await parsed.empty, 'never', 'uppercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with empty header should succeed for "always uppercase"', async t => {
+	const [actual] = headerCase(await parsed.empty, 'always', 'uppercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with lowercase header should fail for "never lowercase"', async t => {
+	const [actual] = headerCase(await parsed.lowercase, 'never', 'lowercase');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with lowercase header should succeed for "always lowercase"', async t => {
+	const [actual] = headerCase(await parsed.lowercase, 'always', 'lowercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with mixedcase header should succeed for "never lowercase"', async t => {
+	const [actual] = headerCase(await parsed.mixedcase, 'never', 'lowercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with mixedcase header should fail for "always lowercase"', async t => {
+	const [actual] = headerCase(await parsed.mixedcase, 'always', 'lowercase');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with mixedcase header should succeed for "never uppercase"', async t => {
+	const [actual] = headerCase(await parsed.mixedcase, 'never', 'uppercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with mixedcase header should fail for "always uppercase"', async t => {
+	const [actual] = headerCase(await parsed.mixedcase, 'always', 'uppercase');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with uppercase header should fail for "never uppercase"', async t => {
+	const [actual] = headerCase(await parsed.uppercase, 'never', 'uppercase');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with lowercase header should succeed for "always uppercase"', async t => {
+	const [actual] = headerCase(await parsed.uppercase, 'always', 'uppercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with camelcase header should fail for "always uppercase"', async t => {
+	const [actual] = headerCase(await parsed.camelcase, 'always', 'uppercase');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with camelcase header should succeed for "never uppercase"', async t => {
+	const [actual] = headerCase(await parsed.camelcase, 'never', 'uppercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with camelcase header should fail for "always pascalcase"', async t => {
+	const [actual] = headerCase(await parsed.camelcase, 'always', 'pascal-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with camelcase header should fail for "always kebabcase"', async t => {
+	const [actual] = headerCase(await parsed.camelcase, 'always', 'kebab-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with camelcase header should fail for "always snakecase"', async t => {
+	const [actual] = headerCase(await parsed.camelcase, 'always', 'snake-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with camelcase header should succeed for "always camelcase"', async t => {
+	const [actual] = headerCase(await parsed.camelcase, 'always', 'camel-case');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with pascalcase header should fail for "always uppercase"', async t => {
+	const [actual] = headerCase(await parsed.pascalcase, 'always', 'uppercase');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with pascalcase header should succeed for "never uppercase"', async t => {
+	const [actual] = headerCase(await parsed.pascalcase, 'never', 'uppercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with pascalcase header should succeed for "always pascalcase"', async t => {
+	const [actual] = headerCase(await parsed.pascalcase, 'always', 'pascal-case');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with pascalcase header should fail for "always kebabcase"', async t => {
+	const [actual] = headerCase(await parsed.pascalcase, 'always', 'kebab-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with pascalcase header should fail for "always snakecase"', async t => {
+	const [actual] = headerCase(await parsed.pascalcase, 'always', 'snake-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with pascalcase header should fail for "always camelcase"', async t => {
+	const [actual] = headerCase(await parsed.pascalcase, 'always', 'camel-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with snakecase header should fail for "always uppercase"', async t => {
+	const [actual] = headerCase(await parsed.snakecase, 'always', 'uppercase');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with snakecase header should succeed for "never uppercase"', async t => {
+	const [actual] = headerCase(await parsed.snakecase, 'never', 'uppercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with snakecase header should fail for "always pascalcase"', async t => {
+	const [actual] = headerCase(await parsed.snakecase, 'always', 'pascal-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with snakecase header should fail for "always kebabcase"', async t => {
+	const [actual] = headerCase(await parsed.snakecase, 'always', 'kebab-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with snakecase header should succeed for "always snakecase"', async t => {
+	const [actual] = headerCase(await parsed.snakecase, 'always', 'snake-case');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with snakecase header should fail for "always camelcase"', async t => {
+	const [actual] = headerCase(await parsed.snakecase, 'always', 'camel-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with startcase header should fail for "always uppercase"', async t => {
+	const [actual] = headerCase(await parsed.startcase, 'always', 'uppercase');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with startcase header should succeed for "never uppercase"', async t => {
+	const [actual] = headerCase(await parsed.startcase, 'never', 'uppercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with startcase header should fail for "always pascalcase"', async t => {
+	const [actual] = headerCase(await parsed.startcase, 'always', 'pascal-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with startcase header should fail for "always kebabcase"', async t => {
+	const [actual] = headerCase(await parsed.startcase, 'always', 'kebab-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with startcase header should fail for "always snakecase"', async t => {
+	const [actual] = headerCase(await parsed.startcase, 'always', 'snake-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with startcase header should fail for "always camelcase"', async t => {
+	const [actual] = headerCase(await parsed.startcase, 'always', 'camel-case');
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with startcase header should succeed for "always startcase"', async t => {
+	const [actual] = headerCase(await parsed.startcase, 'always', 'start-case');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('should use expected message with "always"', async t => {
+	const [, message] = headerCase(
+		await parsed.uppercase,
+		'always',
+		'lower-case'
+	);
+	t.true(message.indexOf('must be lower-case') > -1);
+});
+
+test('should use expected message with "never"', async t => {
+	const [, message] = headerCase(await parsed.uppercase, 'never', 'upper-case');
+	t.true(message.indexOf('must not be upper-case') > -1);
+});
+
+test('with uppercase scope should succeed for "always [uppercase, lowercase]"', async t => {
+	const [actual] = headerCase(await parsed.uppercase, 'always', [
+		'uppercase',
+		'lowercase'
+	]);
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with lowercase header should succeed for "always [uppercase, lowercase]"', async t => {
+	const [actual] = headerCase(await parsed.lowercase, 'always', [
+		'uppercase',
+		'lowercase'
+	]);
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with mixedcase header should fail for "always [uppercase, lowercase]"', async t => {
+	const [actual] = headerCase(await parsed.mixedcase, 'always', [
+		'uppercase',
+		'lowercase'
+	]);
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with mixedcase header should pass for "always [uppercase, lowercase, camel-case]"', async t => {
+	const [actual] = headerCase(await parsed.mixedcase, 'always', [
+		'uppercase',
+		'lowercase',
+		'camel-case'
+	]);
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with mixedcase scope should pass for "never [uppercase, lowercase]"', async t => {
+	const [actual] = headerCase(await parsed.mixedcase, 'never', [
+		'uppercase',
+		'lowercase'
+	]);
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with uppercase scope should fail for "never [uppercase, lowercase]"', async t => {
+	const [actual] = headerCase(await parsed.uppercase, 'never', [
+		'uppercase',
+		'lowercase'
+	]);
+	const expected = false;
+	t.is(actual, expected);
+});
+
+test('with numeric header should succeed for "never lowercase"', async t => {
+	const [actual] = headerCase(await parsed.numeric, 'never', 'lowercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with numeric header should succeed for "always lowercase"', async t => {
+	const [actual] = headerCase(await parsed.numeric, 'always', 'lowercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with numeric header should succeed for "never uppercase"', async t => {
+	const [actual] = headerCase(await parsed.numeric, 'never', 'uppercase');
+	const expected = true;
+	t.is(actual, expected);
+});
+
+test('with numeric header should succeed for "always uppercase"', async t => {
+	const [actual] = headerCase(await parsed.numeric, 'always', 'uppercase');
+	const expected = true;
+	t.is(actual, expected);
+});
diff --git a/@commitlint/rules/src/index.js b/@commitlint/rules/src/index.js
index 5779959b0b3..4d61033f57f 100644
--- a/@commitlint/rules/src/index.js
+++ b/@commitlint/rules/src/index.js
@@ -10,6 +10,7 @@ export default {
 	'footer-max-length': require('./footer-max-length'),
 	'footer-max-line-length': require('./footer-max-line-length'),
 	'footer-min-length': require('./footer-min-length'),
+	'header-case': require('./header-case'),
 	'header-full-stop': require('./header-full-stop'),
 	'header-max-length': require('./header-max-length'),
 	'header-min-length': require('./header-min-length'),