commit.js

import { execSync, spawn } from 'child_process';

import path from 'path';

import { writeFileSync, openSync, closeSync } from 'fs';

import dedent from 'dedent';

export { commit };

/**
 * Asynchronously git commit at a given path with a message
 */
function commit (repoPath, message, options, done) {
 let called = false;

 // commit the file by spawning a git process, unless the --hook
 // option was provided. in that case, write the commit message into
 // the .git/COMMIT_EDITMSG file
 if (!options.hookMode) {
 let args = ['commit', '-m', dedent(message), ...(options.args || [])];
 let child = spawn('git', args, {
 cwd: repoPath,
 stdio: options.quiet ? 'ignore' : 'inherit'
 });

 child.on('error', function (err) {
 if (called) return;
 called = true;

 done(err);
 });

 child.on('exit', function (code, signal) {
 if (called) return;
 called = true;

 if (code) {
 if (code === 128) {
 console.warn(`
 Git exited with code 128. Did you forget to run:

 git config --global user.email "you@example.com"
 git config --global user.name "Your Name"
 `)
 }
 done(Object.assign(new Error(`git exited with error code ${code}`), { code, signal }));
 } else {
 done(null);
 }
 });
 } else {
 const gitDirPath = execSync(
 'git rev-parse --absolute-git-dir',
 { cwd: repoPath, encoding: 'utf8' },
 ).trim();
 const commitFilePath = path.join(gitDirPath, 'COMMIT_EDITMSG');
 try {
 const fd = openSync(commitFilePath, 'w');
 try {
 writeFileSync(fd, dedent(message));
 done(null);
 } catch (e) {
 done(e);
 } finally {
 closeSync(fd);
 }
 } catch (e) {
 // windows doesn't allow opening existing hidden files
 // in 'w' mode... but it does let you do 'r+'!
 try {
 const fd = openSync(commitFilePath, 'r+');
 try {
 writeFileSync(fd, dedent(message));
 done(null);
 } catch (e) {
 done(e);
 } finally {
 closeSync(fd);
 }
 } catch (e) {
 done(e);
 }
 }
 }
}