feat: adds support for plugins (#228) (#588)

Author: SimeonC

Diff for: @commitlint/cli/src/cli.js

@@ -139,7 +139,16 @@ async function main(options) {
 	const loadOpts = {cwd: flags.cwd, file: flags.config};
 	const loaded = await load(getSeed(flags), loadOpts);
 	const parserOpts = selectParserOpts(loaded.parserPreset);
-	const opts = parserOpts ? {parserOpts} : {parserOpts: {}};
+	const opts = {
+		parserOpts: {},
+		plugins: {}
+	};
+	if (parserOpts) {
+		opts.parserOpts = parserOpts;
+	}
+	if (loaded.plugins) {
+		opts.plugins = loaded.plugins;
+	}
 	const format = loadFormatter(loaded, flags);
 
 	// Strip comments if reading from `.git/COMMIT_EDIT_MSG`

Diff for: @commitlint/lint/package.json

@@ -67,7 +67,8 @@
     "cross-env": "5.1.1",
     "execa": "0.9.0",
     "globby": "8.0.1",
-    "rimraf": "2.6.1"
+    "rimraf": "2.6.1",
+    "proxyquire": "2.1.0"
   },
   "dependencies": {
     "@commitlint/is-ignored": "^7.5.1",

Diff for: @commitlint/lint/src/index.js

@@ -2,7 +2,7 @@ import util from 'util';
 import isIgnored from '@commitlint/is-ignored';
 import parse from '@commitlint/parse';
 import implementations from '@commitlint/rules';
-import {toPairs} from 'lodash';
+import {toPairs, values} from 'lodash';
 
 const buildCommitMesage = ({header, body, footer}) => {
 	let message = header;
@@ -27,13 +27,24 @@ export default async (message, rules = {}, opts = {}) => {
 	// Parse the commit message
 	const parsed = await parse(message, undefined, opts.parserOpts);
 
+	const mergedImplementations = Object.assign({}, implementations);
+	if (opts.plugins) {
+		values(opts.plugins).forEach(plugin => {
+			if (plugin.rules) {
+				Object.keys(plugin.rules).forEach(ruleKey => {
+					mergedImplementations[ruleKey] = plugin.rules[ruleKey];
+				});
+			}
+		});
+	}
+
 	// Find invalid rules configs
 	const missing = Object.keys(rules).filter(
-		name => typeof implementations[name] !== 'function'
+		name => typeof mergedImplementations[name] !== 'function'
 	);
 
 	if (missing.length > 0) {
-		const names = Object.keys(implementations);
+		const names = Object.keys(mergedImplementations);
 		throw new RangeError(
 			`Found invalid rule names: ${missing.join(
 				', '
@@ -120,7 +131,7 @@ export default async (message, rules = {}, opts = {}) => {
 				return null;
 			}
 
-			const rule = implementations[name];
+			const rule = mergedImplementations[name];
 
 			const [valid, message] = rule(parsed, when, value);
 

Diff for: @commitlint/lint/src/index.test.js

@@ -184,6 +184,46 @@ test('fails for custom issue prefix', async t => {
 	t.false(report.valid);
 });
 
+test('fails for custom plugin rule', async t => {
+	const report = await lint(
+		'somehting #1',
+		{
+			'plugin-rule': [2, 'never']
+		},
+		{
+			plugins: {
+				'plugin-example': {
+					rules: {
+						'plugin-rule': () => [false]
+					}
+				}
+			}
+		}
+	);
+
+	t.false(report.valid);
+});
+
+test('passes for custom plugin rule', async t => {
+	const report = await lint(
+		'somehting #1',
+		{
+			'plugin-rule': [2, 'never']
+		},
+		{
+			plugins: {
+				'plugin-example': {
+					rules: {
+						'plugin-rule': () => [true]
+					}
+				}
+			}
+		}
+	);
+
+	t.true(report.valid);
+});
+
 test('returns original message only with commit header', async t => {
 	const message = 'foo: bar';
 	const report = await lint(message);

Diff for: @commitlint/load/fixtures/extends-plugins/commitlint.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+	extends: [],
+	plugins: ['example', '@scope/example']
+};

Diff for: @commitlint/load/src/index.js

@@ -4,10 +4,11 @@ import resolveExtends from '@commitlint/resolve-extends';
 import cosmiconfig from 'cosmiconfig';
 import {toPairs, merge, mergeWith, pick} from 'lodash';
 import resolveFrom from 'resolve-from';
+import loadPlugin from './utils/loadPlugin';
 
 const w = (a, b) => (Array.isArray(b) ? b : undefined);
 const valid = input =>
-	pick(input, 'extends', 'rules', 'parserPreset', 'formatter');
+	pick(input, 'extends', 'plugins', 'rules', 'parserPreset', 'formatter');
 
 export default async (seed = {}, options = {cwd: process.cwd()}) => {
 	const loaded = await loadConfig(options.cwd, options.file);
@@ -16,8 +17,8 @@ export default async (seed = {}, options = {cwd: process.cwd()}) => {
 	// Merge passed config with file based options
 	const config = valid(merge(loaded.config, seed));
 	const opts = merge(
-		{extends: [], rules: {}, formatter: '@commitlint/format'},
-		pick(config, 'extends')
+		{extends: [], plugins: [], rules: {}, formatter: '@commitlint/format'},
+		pick(config, 'extends', 'plugins')
 	);
 
 	// Resolve parserPreset key
@@ -55,6 +56,14 @@ export default async (seed = {}, options = {cwd: process.cwd()}) => {
 			resolveFrom.silent(base, config.formatter) || config.formatter;
 	}
 
+	// resolve plugins
+	preset.plugins = {};
+	if (config.plugins && config.plugins.length) {
+		config.plugins.forEach(pluginKey => {
+			loadPlugin(preset.plugins, pluginKey, process.env.DEBUG === 'true');
+		});
+	}
+
 	// Execute rule config functions if needed
 	const executed = await Promise.all(
 		['rules']

Diff for: @commitlint/load/src/index.test.js

@@ -5,6 +5,10 @@ import resolveFrom from 'resolve-from';
 
 import load from '.';
 
+const proxyquire = require('proxyquire')
+	.noCallThru()
+	.noPreserveCache();
+
 test('extends-empty should have no rules', async t => {
 	const cwd = await git.bootstrap('fixtures/extends-empty');
 	const actual = await load({}, {cwd});
@@ -24,6 +28,41 @@ test('rules should be loaded from specify config file', async t => {
 	t.is(actual.rules.foo, 'bar');
 });
 
+test('plugins should be loaded from seed', async t => {
+	const plugin = {'@global': true};
+	const scopedPlugin = {'@global': true};
+	const stubbedLoad = proxyquire('.', {
+		'commitlint-plugin-example': plugin,
+		'@scope/commitlint-plugin-example': scopedPlugin
+	});
+
+	const cwd = await git.bootstrap('fixtures/extends-empty');
+	const actual = await stubbedLoad(
+		{plugins: ['example', '@scope/example']},
+		{cwd}
+	);
+	t.deepEqual(actual.plugins, {
+		example: plugin,
+		'@scope/example': scopedPlugin
+	});
+});
+
+test('plugins should be loaded from config', async t => {
+	const plugin = {'@global': true};
+	const scopedPlugin = {'@global': true};
+	const stubbedLoad = proxyquire('.', {
+		'commitlint-plugin-example': plugin,
+		'@scope/commitlint-plugin-example': scopedPlugin
+	});
+
+	const cwd = await git.bootstrap('fixtures/extends-plugins');
+	const actual = await stubbedLoad({}, {cwd});
+	t.deepEqual(actual.plugins, {
+		example: plugin,
+		'@scope/example': scopedPlugin
+	});
+});
+
 test('uses seed with parserPreset', async t => {
 	const cwd = await git.bootstrap('fixtures/parser-preset');
 	const {parserPreset: actual} = await load(
@@ -61,6 +100,7 @@ test('respects cwd option', async t => {
 	t.deepEqual(actual, {
 		formatter: '@commitlint/format',
 		extends: ['./second-extended'],
+		plugins: {},
 		rules: {
 			one: 1,
 			two: 2
@@ -74,6 +114,7 @@ test('recursive extends', async t => {
 	t.deepEqual(actual, {
 		formatter: '@commitlint/format',
 		extends: ['./first-extended'],
+		plugins: {},
 		rules: {
 			zero: 0,
 			one: 1,
@@ -89,6 +130,7 @@ test('recursive extends with json file', async t => {
 	t.deepEqual(actual, {
 		formatter: '@commitlint/format',
 		extends: ['./first-extended'],
+		plugins: {},
 		rules: {
 			zero: 0,
 			one: 1,
@@ -104,6 +146,7 @@ test('recursive extends with yaml file', async t => {
 	t.deepEqual(actual, {
 		formatter: '@commitlint/format',
 		extends: ['./first-extended'],
+		plugins: {},
 		rules: {
 			zero: 0,
 			one: 1,
@@ -119,6 +162,7 @@ test('recursive extends with js file', async t => {
 	t.deepEqual(actual, {
 		formatter: '@commitlint/format',
 		extends: ['./first-extended'],
+		plugins: {},
 		rules: {
 			zero: 0,
 			one: 1,
@@ -134,6 +178,7 @@ test('recursive extends with package.json file', async t => {
 	t.deepEqual(actual, {
 		formatter: '@commitlint/format',
 		extends: ['./first-extended'],
+		plugins: {},
 		rules: {
 			zero: 0,
 			one: 1,
@@ -169,6 +214,7 @@ test('ignores unknow keys', async t => {
 	t.deepEqual(actual, {
 		formatter: '@commitlint/format',
 		extends: [],
+		plugins: {},
 		rules: {
 			foo: 'bar',
 			baz: 'bar'
@@ -183,6 +229,7 @@ test('ignores unknow keys recursively', async t => {
 	t.deepEqual(actual, {
 		formatter: '@commitlint/format',
 		extends: ['./one'],
+		plugins: {},
 		rules: {
 			zero: 0,
 			one: 1
@@ -200,6 +247,7 @@ test('find up from given cwd', async t => {
 	t.deepEqual(actual, {
 		formatter: '@commitlint/format',
 		extends: [],
+		plugins: {},
 		rules: {
 			child: true,
 			inner: false,
@@ -216,6 +264,7 @@ test('find up config from outside current git repo', async t => {
 	t.deepEqual(actual, {
 		formatter: '@commitlint/format',
 		extends: [],
+		plugins: {},
 		rules: {
 			child: false,
 			inner: false,
@@ -231,6 +280,7 @@ test('respects formatter option', async t => {
 	t.deepEqual(actual, {
 		formatter: 'commitlint-junit',
 		extends: [],
+		plugins: {},
 		rules: {}
 	});
 });
@@ -242,6 +292,7 @@ test('resolves formatter relative from config directory', async t => {
 	t.deepEqual(actual, {
 		formatter: resolveFrom(cwd, './formatters/custom.js'),
 		extends: [],
+		plugins: {},
 		rules: {}
 	});
 });
@@ -253,6 +304,7 @@ test('returns formatter name when unable to resolve from config directory', asyn
 	t.deepEqual(actual, {
 		formatter: './doesnt/exists.js',
 		extends: [],
+		plugins: {},
 		rules: {}
 	});
 });

Diff for: @commitlint/load/src/utils/loadPlugin.js

@@ -0,0 +1,74 @@
+import path from 'path';
+import chalk from 'chalk';
+import {normalizePackageName, getShorthandName} from './pluginNaming';
+
+export default function loadPlugin(plugins, pluginName, debug = false) {
+	const longName = normalizePackageName(pluginName);
+	const shortName = getShorthandName(longName);
+	let plugin = null;
+
+	if (pluginName.match(/\s+/u)) {
+		const whitespaceError = new Error(
+			`Whitespace found in plugin name '${pluginName}'`
+		);
+
+		whitespaceError.messageTemplate = 'whitespace-found';
+		whitespaceError.messageData = {
+			pluginName: longName
+		};
+		throw whitespaceError;
+	}
+
+	const pluginKey = longName === pluginName ? shortName : pluginName;
+
+	if (!plugins[pluginKey]) {
+		try {
+			plugin = require(longName);
+		} catch (pluginLoadErr) {
+			try {
+				// Check whether the plugin exists
+				require.resolve(longName);
+			} catch (missingPluginErr) {
+				// If the plugin can't be resolved, display the missing plugin error (usually a config or install error)
+				console.error(chalk.red(`Failed to load plugin ${longName}.`));
+				missingPluginErr.message = `Failed to load plugin ${pluginName}: ${
+					missingPluginErr.message
+				}`;
+				missingPluginErr.messageTemplate = 'plugin-missing';
+				missingPluginErr.messageData = {
+					pluginName: longName,
+					commitlintPath: path.resolve(__dirname, '../..')
+				};
+				throw missingPluginErr;
+			}
+
+			// Otherwise, the plugin exists and is throwing on module load for some reason, so print the stack trace.
+			throw pluginLoadErr;
+		}
+
+		// This step is costly, so skip if debug is disabled
+		if (debug) {
+			const resolvedPath = require.resolve(longName);
+
+			let version = null;
+
+			try {
+				version = require(`${longName}/package.json`).version;
+			} catch (e) {
+				// Do nothing
+			}
+
+			const loadedPluginAndVersion = version
+				? `${longName}@${version}`
+				: `${longName}, version unknown`;
+
+			console.log(
+				chalk.blue(
+					`Loaded plugin ${pluginName} (${loadedPluginAndVersion}) (from ${resolvedPath})`
+				)
+			);
+		}
+
+		plugins[pluginKey] = plugin;
+	}
+}