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spawn.js
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71 lines (54 loc) · 1.63 KB
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'use strict';
const spawn = require('cross-spawn');
const Promise = require('bluebird');
const CacheStream = require('./cache_stream');
function promiseSpawn(command, args = [], options = {}) {
if (!command) throw new TypeError('command is required!');
if (typeof args === 'string') args = [args];
if (!Array.isArray(args)) {
options = args;
args = [];
}
return new Promise((resolve, reject) => {
const task = spawn(command, args, options);
const verbose = options.verbose;
const { encoding = 'utf8' } = options;
const stdoutCache = new CacheStream();
const stderrCache = new CacheStream();
if (task.stdout) {
const stdout = task.stdout.pipe(stdoutCache);
if (verbose) stdout.pipe(process.stdout);
}
if (task.stderr) {
const stderr = task.stderr.pipe(stderrCache);
if (verbose) stderr.pipe(process.stderr);
}
task.on('close', code => {
if (code) {
const e = new Error(getCache(stderrCache, encoding));
e.code = code;
return reject(e);
}
resolve(getCache(stdoutCache, encoding));
});
task.on('error', reject);
// Listen to exit events if neither stdout and stderr exist (inherit stdio)
if (!task.stdout && !task.stderr) {
task.on('exit', code => {
if (code) {
const e = new Error('Spawn failed');
e.code = code;
return reject(e);
}
resolve();
});
}
});
}
function getCache(stream, encoding) {
const buf = stream.getCache();
stream.destroy();
if (!encoding) return buf;
return buf.toString(encoding);
}
module.exports = promiseSpawn;