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77 lines (71 loc) · 2.41 KB
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/**
* @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
*/
/** A parsed commit message. */
export interface ParsedCommitMessage {
header: string;
body: string;
bodyWithoutLinking: string;
type: string;
scope: string;
subject: string;
isFixup: boolean;
isSquash: boolean;
isRevert: boolean;
}
/** Regex determining if a commit is a fixup. */
const FIXUP_PREFIX_RE = /^fixup! /i;
/** Regex finding all github keyword links. */
const GITHUB_LINKING_RE = /((closed?s?)|(fix(es)?(ed)?)|(resolved?s?))\s\#(\d+)/ig;
/** Regex determining if a commit is a squash. */
const SQUASH_PREFIX_RE = /^squash! /i;
/** Regex determining if a commit is a revert. */
const REVERT_PREFIX_RE = /^revert:? /i;
/** Regex determining the scope of a commit if provided. */
const TYPE_SCOPE_RE = /^(\w+)(?:\(([^)]+)\))?\:\s(.+)$/;
/** Regex determining the entire header line of the commit. */
const COMMIT_HEADER_RE = /^(.*)/i;
/** Regex determining the body of the commit. */
const COMMIT_BODY_RE = /^.*\n\n([\s\S]*)$/;
/** Parse a full commit message into its composite parts. */
export function parseCommitMessage(commitMsg: string): ParsedCommitMessage {
// Ignore comments (i.e. lines starting with `#`). Comments are automatically removed by git and
// should not be considered part of the final commit message.
commitMsg = commitMsg.split('\n').filter(line => !line.startsWith('#')).join('\n');
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),
};
}