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garrytanandcapy-ai[bot]
1e103659a0
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>
55 lines
2.9 KiB
TypeScript
55 lines
2.9 KiB
TypeScript
/**
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* default-base — the base branch a command uses when none is given (GST-511).
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* A remote's HEAD counts only when it names a branch other than the
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* checked-out one: a clone made by a PR flow can point origin/HEAD at the PR
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* branch, and that base diffs the branch against itself, an empty diff every
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* gate passes. Past it: the PR's base from gh (a short timeout, any failure
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* ignored; none for a PR from another repository), then `<remote>/main`, then `<remote>/master`. A detached HEAD keeps
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* the remote's HEAD. bin/gstack-diff-scope carries the same chain in bash.
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*/
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import { spawnSync } from 'node:child_process';
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export interface DefaultBase {
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/** The base branch name, or null when nothing resolves. */
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branch: string | null;
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/** The remote whose HEAD named `branch`; unset for the PR base, main and master. */
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remote?: string;
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/** The first remote HEAD skipped because it names the checked-out branch. */
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skipped?: { remote: string; branch: string };
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}
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/** gh's jq for the PR's base branch; a PR from another repository names a branch origin may not hold, so it names none. */
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const PR_BASE = 'if .isCrossRepository then "" else .baseRefName end';
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function read(cmd: string, args: string[], cwd: string, timeout: number): string {
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const r = spawnSync(cmd, args, {
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cwd, encoding: 'utf8', timeout, stdio: ['ignore', 'pipe', 'pipe'],
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env: { ...process.env, GIT_TERMINAL_PROMPT: '0', GH_PROMPT_DISABLED: '1' },
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});
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return r.status === 0 ? (r.stdout ?? '').trim() : '';
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}
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export function defaultBaseBranch(cwd: string, remotes: readonly string[] = ['origin']): DefaultBase {
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const current = read('git', ['symbolic-ref', '--quiet', 'HEAD'], cwd, 30_000).replace(/^refs\/heads\//, '');
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let skipped: DefaultBase['skipped'];
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for (const remote of remotes) {
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const prefix = `refs/remotes/${remote}/`;
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const target = read('git', ['symbolic-ref', '--quiet', `${prefix}HEAD`], cwd, 30_000);
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if (!target.startsWith(prefix)) continue;
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const branch = target.slice(prefix.length);
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if (branch !== current) return { branch, remote };
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skipped ??= { remote, branch };
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}
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const pr = current ? read('gh', ['pr', 'view', '--json', 'baseRefName,isCrossRepository', '-q', PR_BASE], cwd, 5_000).split('\n')[0] : '';
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if (pr) return { branch: pr, skipped };
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for (const name of ['main', 'master']) {
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if (remotes.some((remote) => read('git', ['rev-parse', '--verify', '--quiet', `refs/remotes/${remote}/${name}^{commit}`], cwd, 30_000))) return { branch: name, skipped };
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}
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return { branch: null, skipped };
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}
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/** Why there is no default base: a remote HEAD named the checked-out branch and nothing past it resolved. */
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export function noDefaultBaseLine({ remote, branch }: { remote: string; branch: string }): string {
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return `${remote}/HEAD names the checked-out branch ${branch}, and no PR base, ${remote}/main or ${remote}/master resolves; pass the base explicitly or run git remote set-head ${remote} <base>`;
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}
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