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