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import { execGitNonInteractive } from '../utils/exec.js';
export interface GitFileChange {
filename: string;
status: 'added' | 'removed' | 'modified' | 'renamed' | 'copied';
additions: number;
deletions: number;
patch?: string;
chunks?: number;
}
/**
* Execute a git command and return stdout.
* Uses array-based arguments to avoid shell injection.
*/
function git(args: string[], cwd: string = process.cwd()): string {
try {
return execGitNonInteractive(args, { cwd });
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
throw new Error(`Git command failed: git ${args.join(' ')}\n${message}`, { cause: error });
}
}
/**
* Get the current branch name.
*/
export function getCurrentBranch(cwd: string = process.cwd()): string {
return git(['rev-parse', '--abbrev-ref', 'HEAD'], cwd);
}
/**
* Get the HEAD commit SHA.
*/
export function getHeadSha(cwd: string = process.cwd()): string {
return resolveRef('HEAD', cwd);
}
/**
* Resolve a ref (branch name, tag, SHA) to a full commit SHA.
*/
export function resolveRef(ref: string, cwd: string = process.cwd()): string {
return git(['rev-parse', ref], cwd);
}
/**
* Detect the default branch by checking common branch names locally.
* Also checks remote tracking refs (origin/*) for shallow clones
* where local branches may not exist (e.g. GitHub Actions).
* Does not perform any remote operations to avoid SSH prompts.
*/
export function getDefaultBranch(cwd: string = process.cwd()): string {
// Check common default branches locally (no remote operations)
for (const branch of ['main', 'master', 'develop']) {
try {
git(['rev-parse', '--verify', branch], cwd);
return branch;
} catch {
// Try next branch
}
}
// Check remote tracking refs (common in shallow clones / CI)
for (const branch of ['main', 'master', 'develop']) {
try {
git(['rev-parse', '--verify', `origin/${branch}`], cwd);
return `origin/${branch}`;
} catch {
// Try next branch
}
}
// Check remote HEAD symbolic ref (set by clone, no network needed)
try {
const remoteHead = git(['symbolic-ref', 'refs/remotes/origin/HEAD'], cwd);
if (remoteHead) {
// Returns e.g. "refs/remotes/origin/main" → extract "origin/main"
const match = remoteHead.match(/refs\/remotes\/(.*)/);
Eif (match?.[1]) {
return match[1];
}
}
} catch {
// No remote HEAD configured
}
// Check git config for user-configured default branch
try {
const configuredDefault = git(['config', 'init.defaultBranch'], cwd);
if (configuredDefault) {
return configuredDefault;
}
} catch {
// Config not set
}
return 'main'; // Default fallback
}
/**
* Get the repository root path.
*/
export function getRepoRoot(cwd: string = process.cwd()): string {
return git(['rev-parse', '--show-toplevel'], cwd);
}
/**
* Get the repository name from the git remote or directory name.
*/
export function getRepoName(cwd: string = process.cwd()): { owner: string; name: string } {
try {
const remoteUrl = git(['config', '--get', 'remote.origin.url'], cwd);
// Handle SSH: git@github.com:owner/repo.git
// Handle HTTPS: https://github.com/owner/repo.git
const match = remoteUrl.match(/[/:]([\w.-]+)\/([\w.-]+?)(?:\.git)?$/);
Iif (match && match[1] && match[2]) {
return { owner: match[1], name: match[2] };
}
} catch {
// No remote configured
}
// Fall back to directory name
const repoRoot = getRepoRoot(cwd);
const dirName = repoRoot.split('/').pop() ?? 'unknown';
return { owner: 'local', name: dirName };
}
/**
* Get the GitHub repository URL if the remote is on GitHub.
* Returns null if the remote is not GitHub or not configured.
*/
export function getGitHubRepoUrl(cwd: string = process.cwd()): string | null {
try {
const remoteUrl = git(['config', '--get', 'remote.origin.url'], cwd);
// Handle SSH: git@github.com:owner/repo.git
const sshMatch = remoteUrl.match(/git@github\.com:([\w.-]+)\/([\w.-]+?)(?:\.git)?$/);
Iif (sshMatch && sshMatch[1] && sshMatch[2]) {
return `https://github.com/${sshMatch[1]}/${sshMatch[2]}`;
}
// Handle HTTPS: https://github.com/owner/repo.git
const httpsMatch = remoteUrl.match(/https:\/\/github\.com\/([\w.-]+)\/([\w.-]+?)(?:\.git)?$/);
if (httpsMatch && httpsMatch[1] && httpsMatch[2]) {
return `https://github.com/${httpsMatch[1]}/${httpsMatch[2]}`;
}
} catch {
// No remote configured
}
return null;
}
/**
* Map git status letter to FileChange status.
*/
function mapStatus(status: string): GitFileChange['status'] {
switch (status[0]) {
case 'A':
return 'added';
case 'D':
return 'removed';
case 'M':
return 'modified';
case 'R':
return 'renamed';
case 'C':
return 'copied';
default:
return 'modified';
}
}
export interface DiffOptions {
/** Use --cached to diff only staged changes against HEAD */
staged?: boolean;
}
/**
* Build the git diff arguments for a given base/head/staged configuration.
* Extra flags (e.g. '--name-status') are placed before the ref, matching
* the documented git-diff synopsis: git diff [<options>] [<commit>] ...
*/
function buildDiffArgs(
base: string,
head: string | undefined,
options?: DiffOptions,
extraFlags?: string[]
): string[] {
const flags = extraFlags ?? [];
if (options?.staged) {
return ['diff', ...flags, '--cached'];
}
const diffRef = head ? `${base}...${head}` : base;
return ['diff', ...flags, diffRef];
}
/**
* Get list of changed files between two refs.
* If head is undefined, compares against the working tree.
* If options.staged is true, compares only staged changes against HEAD.
*/
export function getChangedFiles(
base: string,
head?: string,
cwd: string = process.cwd(),
options?: DiffOptions
): GitFileChange[] {
// Get file statuses
const nameStatusOutput = git(buildDiffArgs(base, head, options, ['--name-status']), cwd);
Iif (!nameStatusOutput) {
return [];
}
const files: GitFileChange[] = [];
for (const line of nameStatusOutput.split('\n')) {
Iif (!line.trim()) continue;
const parts = line.split('\t');
const status = parts[0] ?? '';
// For renames, format is "R100\told-name\tnew-name"
const filename = parts.length > 2 ? (parts[2] ?? '') : (parts[1] ?? '');
Iif (!filename) continue;
files.push({
filename,
status: mapStatus(status),
additions: 0,
deletions: 0,
});
}
// Get numstat for additions/deletions
const numstatOutput = git(buildDiffArgs(base, head, options, ['--numstat']), cwd);
Eif (numstatOutput) {
for (const line of numstatOutput.split('\n')) {
Iif (!line.trim()) continue;
const parts = line.split('\t');
const additions = parts[0] ?? '0';
const deletions = parts[1] ?? '0';
const filename = parts[2] ?? '';
const file = files.find((f) => f.filename === filename);
Eif (file) {
file.additions = additions === '-' ? 0 : parseInt(additions, 10);
file.deletions = deletions === '-' ? 0 : parseInt(deletions, 10);
}
}
}
return files;
}
/**
* Get the patch for a specific file.
*/
export function getFilePatch(
base: string,
head: string | undefined,
filename: string,
cwd: string = process.cwd(),
options?: DiffOptions
): string | undefined {
try {
return git([...buildDiffArgs(base, head, options), '--', filename], cwd);
} catch {
return undefined;
}
}
/**
* Parse a combined diff output into individual file patches.
*/
function parseCombinedDiff(diffOutput: string): Map<string, string> {
const patches = new Map<string, string>();
Iif (!diffOutput) return patches;
// Split by "diff --git" but keep the delimiter
const parts = diffOutput.split(/(?=^diff --git )/m);
for (const part of parts) {
Iif (!part.trim()) continue;
// Extract filename from "diff --git a/path b/path" line
const match = part.match(/^diff --git a\/(.+?) b\/(.+?)\n/);
Eif (match) {
// Use the "b" path (destination) as the filename
const filename = match[2];
Eif (filename) {
patches.set(filename, part);
}
}
}
return patches;
}
/**
* Get patches for all changed files in a single git command.
*/
export function getChangedFilesWithPatches(
base: string,
head?: string,
cwd: string = process.cwd(),
options?: DiffOptions
): GitFileChange[] {
const files = getChangedFiles(base, head, cwd, options);
Iif (files.length === 0) {
return files;
}
// Get all patches in a single git diff command
try {
const combinedDiff = git(buildDiffArgs(base, head, options), cwd);
const patches = parseCombinedDiff(combinedDiff);
for (const file of files) {
file.patch = patches.get(file.filename);
file.chunks = countPatchChunks(file.patch);
}
} catch {
// Fall back to per-file patches if combined diff fails
for (const file of files) {
file.patch = getFilePatch(base, head, file.filename, cwd, options);
file.chunks = countPatchChunks(file.patch);
}
}
return files;
}
/**
* Check if there are uncommitted changes in the working tree.
*/
export function hasUncommittedChanges(cwd: string = process.cwd()): boolean {
const status = git(['status', '--porcelain'], cwd);
return status.length > 0;
}
/**
* Check if a ref exists.
*/
export function refExists(ref: string, cwd: string = process.cwd()): boolean {
try {
git(['rev-parse', '--verify', ref], cwd);
return true;
} catch {
return false;
}
}
/**
* Commit message with subject and body separated.
*/
export interface CommitMessage {
/** First line of the commit message */
subject: string;
/** Remaining lines after the subject (may be empty) */
body: string;
}
/**
* Get the commit message for a specific ref.
* Returns subject (first line) and body (remaining lines) separately.
*/
export function getCommitMessage(ref: string, cwd: string = process.cwd()): CommitMessage {
// %s = subject, %b = body
const subject = git(['log', '-1', `--format=%s`, ref], cwd);
const body = git(['log', '-1', `--format=%b`, ref], cwd);
return { subject, body };
}
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