/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {error} from '../utils/console';
import {getCommitMessageConfig} from './config';
/** Options for commit message validation. */
export interface ValidateCommitMessageOptions {
disallowSquash?: boolean;
nonFixupCommitHeaders?: string[];
}
const FIXUP_PREFIX_RE = /^fixup! /i;
const GITHUB_LINKING_RE = /((closed?s?)|(fix(es)?(ed)?)|(resolved?s?))\s\#(\d+)/ig;
const SQUASH_PREFIX_RE = /^squash! /i;
const REVERT_PREFIX_RE = /^revert:? /i;
const TYPE_SCOPE_RE = /^(\w+)(?:\(([^)]+)\))?\:\s(.+)$/;
const COMMIT_HEADER_RE = /^(.*)/i;
const COMMIT_BODY_RE = /^.*\n\n([\s\S]*)$/;
/** Parse a full commit message into its composite parts. */
export function parseCommitMessage(commitMsg: string) {
let header = '';
let body = '';
let bodyWithoutLinking = '';
let type = '';
let scope = '';
let subject = '';
if (COMMIT_HEADER_RE.test(commitMsg)) {
header = COMMIT_HEADER_RE.exec(commitMsg)![1]
.replace(FIXUP_PREFIX_RE, '')
.replace(SQUASH_PREFIX_RE, '');
}
if (COMMIT_BODY_RE.test(commitMsg)) {
body = COMMIT_BODY_RE.exec(commitMsg)![1];
bodyWithoutLinking = body.replace(GITHUB_LINKING_RE, '');
}
if (TYPE_SCOPE_RE.test(header)) {
const parsedCommitHeader = TYPE_SCOPE_RE.exec(header)!;
type = parsedCommitHeader[1];
scope = parsedCommitHeader[2];
subject = parsedCommitHeader[3];
}
return {
header,
body,
bodyWithoutLinking,
type,
scope,
subject,
isFixup: FIXUP_PREFIX_RE.test(commitMsg),
isSquash: SQUASH_PREFIX_RE.test(commitMsg),
isRevert: REVERT_PREFIX_RE.test(commitMsg),
};
}
/** Validate a commit message against using the local repo's config. */
export function validateCommitMessage(
commitMsg: string, options: ValidateCommitMessageOptions = {}) {
function printError(errorMessage: string) {
error(
`INVALID COMMIT MSG: \n` +
`${'─'.repeat(40)}\n` +
`${commitMsg}\n` +
`${'─'.repeat(40)}\n` +
`ERROR: \n` +
` ${errorMessage}` +
`\n\n` +
`The expected format for a commit is: \n` +
`<type>(<scope>): <subject>\n\n<body>`);
}
const config = getCommitMessageConfig().commitMessage;
const commit = parseCommitMessage(commitMsg);
////////////////////////////////////
// Checking revert, squash, fixup //
////////////////////////////////////
// All revert commits are considered valid.
if (commit.isRevert) {
return true;
}
// All squashes are considered valid, as the commit will be squashed into another in
// the git history anyway, unless the options provided to not allow squash commits.
if (commit.isSquash) {
if (options.disallowSquash) {
printError('The commit must be manually squashed into the target commit');
return false;
}
return true;
}
// Fixups commits are considered valid, unless nonFixupCommitHeaders are provided to check
// against. If `nonFixupCommitHeaders` is not empty, we check whether there is a corresponding
// non-fixup commit (i.e. a commit whose header is identical to this commit's header after
// stripping the `fixup! ` prefix), otherwise we assume this verification will happen in another
// check.
if (commit.isFixup) {
if (options.nonFixupCommitHeaders && !options.nonFixupCommitHeaders.includes(commit.header)) {
printError(
'Unable to find match for fixup commit among prior commits: ' +
(options.nonFixupCommitHeaders.map(x => `\n ${x}`).join('') || '-'));
return false;
}
return true;
}
////////////////////////////
// Checking commit header //
////////////////////////////
if (commit.header.length > config.maxLineLength) {
printError(`The commit message header is longer than ${config.maxLineLength} characters`);
return false;
}
if (!commit.type) {
printError(`The commit message header does not match the expected format.`);
return false;
}
if (!config.types.includes(commit.type)) {
printError(`'${commit.type}' is not an allowed type.\n => TYPES: ${config.types.join(', ')}`);
return false;
}
if (commit.scope && !config.scopes.includes(commit.scope)) {
printError(
`'${commit.scope}' is not an allowed scope.\n => SCOPES: ${config.scopes.join(', ')}`);
return false;
}
// Commits with the type of `release` do not require a commit body.
if (commit.type === 'release') {
return true;
}
//////////////////////////
// Checking commit body //
//////////////////////////
if (commit.bodyWithoutLinking.trim().length < config.minBodyLength) {
printError(`The commit message body does not meet the minimum length of ${
config.minBodyLength} characters`);
return false;
}
const bodyByLine = commit.body.split('\n');
if (bodyByLine.some(line => line.length > config.maxLineLength)) {
printError(
`The commit messsage body contains lines greater than ${config.maxLineLength} characters`);
return false;
}
return true;
}