angular-cn/dev-infra/release/versioning/version-branches.ts

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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
*/
import * as semver from 'semver';
import {GithubClient, GithubRepo} from '../../utils/git/github';
/** Type describing a Github repository with corresponding API client. */
export interface GithubRepoWithApi extends GithubRepo {
/** API client that can access the repository. */
api: GithubClient;
}
/** Type describing a version-branch. */
export interface VersionBranch {
/** Name of the branch in Git. e.g. `10.0.x`. */
name: string;
/**
* Parsed SemVer version for the version-branch. Version branches technically do
* not follow the SemVer format, but we can have representative SemVer versions
* that can be used for comparisons, sorting and other checks.
*/
parsed: semver.SemVer;
}
/** Regular expression that matches version-branches. */
const versionBranchNameRegex = /^(\d+)\.(\d+)\.x$/;
/** Gets the version of a given branch by reading the `package.json` upstream. */
export async function getVersionOfBranch(
repo: GithubRepoWithApi, branchName: string): Promise<semver.SemVer> {
const {data} = await repo.api.repos.getContents(
{owner: repo.owner, repo: repo.name, path: '/package.json', ref: branchName});
const {version} = JSON.parse(Buffer.from(data.content, 'base64').toString());
const parsedVersion = semver.parse(version);
if (parsedVersion === null) {
throw Error(`Invalid version detected in following branch: ${branchName}.`);
}
return parsedVersion;
}
/** Whether the given branch corresponds to a version branch. */
export function isVersionBranch(branchName: string): boolean {
return versionBranchNameRegex.test(branchName);
}
/**
* Converts a given version-branch into a SemVer version that can be used with SemVer
* utilities. e.g. to determine semantic order, extract major digit, compare.
*
* For example `10.0.x` will become `10.0.0` in SemVer. The patch digit is not
* relevant but needed for parsing. SemVer does not allow `x` as patch digit.
*/
export function getVersionForVersionBranch(branchName: string): semver.SemVer|null {
return semver.parse(branchName.replace(versionBranchNameRegex, '$1.$2.0'));
}
/**
* Gets the version branches for the specified major versions in descending
* order. i.e. latest version branches first.
*/
export async function getBranchesForMajorVersions(
repo: GithubRepoWithApi, majorVersions: number[]): Promise<VersionBranch[]> {
const {data: branchData} =
await repo.api.repos.listBranches({owner: repo.owner, repo: repo.name, protected: true});
const branches: VersionBranch[] = [];
for (const {name} of branchData) {
if (!isVersionBranch(name)) {
continue;
}
// Convert the version-branch into a SemVer version that can be used with the
// SemVer utilities. e.g. to determine semantic order, compare versions.
const parsed = getVersionForVersionBranch(name);
// Collect all version-branches that match the specified major versions.
if (parsed !== null && majorVersions.includes(parsed.major)) {
branches.push({name, parsed});
}
}
// Sort captured version-branches in descending order.
return branches.sort((a, b) => semver.rcompare(a.parsed, b.parsed));
}