forked from patrick-steele-idem/child-process-promise
-
Notifications
You must be signed in to change notification settings - Fork 0
/
index.js
149 lines (125 loc) · 3.25 KB
/
index.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
'use strict';
var childProcess = require('child_process');
var q = require('q');
/**
* Promise wrapper for exec, execFile
*
* @param {String} method
* @param {...*} args
* @return {Promise}
*/
function wrapper(method, args) {
var deferred = q.defer();
args = [].slice.call(args, 0);
var cp;
args.push(function (err, stdout, stderr) {
if (err) {
var commandStr = args[0] + (Array.isArray(args[1]) ? (' ' + args[1].join(' ')) : '');
err.message += ' `' + commandStr + '` (exited with error code ' + err.code + ')';
err.stdout = stdout;
err.stderr = stderr;
deferred.reject(err);
}
else {
deferred.resolve({
childProcess: cp,
stdout: stdout,
stderr: stderr
});
}
});
cp = childProcess[method].apply(childProcess, args);
process.nextTick(function () {
deferred.notify(cp);
});
return deferred.promise;
}
/**
* `exec` as Promised
*
* @param {String} command
* @param {Object} options
* @return {Promise}
*/
function exec() {
return wrapper('exec', arguments);
}
/**
* `execFile` as Promised
*
* @param {String} command
* @param {Array} args
* @param {Object} options
* @return {Promise}
*/
function execFile() {
return wrapper('execFile', arguments);
}
/**
* `spawn` as Promised
*
* @param {String} command
* @param {Array} args
* @param {Object} options
* @return {Promise}
*/
function spawn(command, args, options) {
var deferred = q.defer();
var result = {};
var cp;
cp = childProcess.spawn(command, args, options);
// Make sure the callee had a chance to add listeners.
process.nextTick(function () {
deferred.notify(cp);
});
// Don't return the whole Buffered result by default.
var captureStdout = false;
var captureStderr = false;
var capture = options && options.capture;
if (capture) {
for (var i = 0, len = capture.length; i < len; i++) {
var cur = capture[i];
if (cur === 'stdout') {
captureStdout = true;
} else if (cur === 'stderr') {
captureStderr = true;
}
}
}
if (captureStdout) {
result.stdout = '';
cp.stdout.on('data', function (data) {
result.stdout += data;
});
}
if (captureStderr) {
result.stderr = '';
cp.stderr.on('data', function (data) {
result.stderr += data;
});
}
cp.on('error', deferred.reject);
cp.on('close', function (code) {
if (code !== 0) {
var commandStr = command + (args.length ? (' ' + args.join(' ')) : '');
var err = {
code: code,
message: '`' + commandStr + '` failed with code ' + code
};
if (captureStderr) {
err.stderr = result.stderr.toString();
}
if (captureStdout) {
err.stdout = result.stdout.toString();
}
deferred.reject(err);
}
else {
deferred.resolve(result);
}
});
return deferred.promise;
}
exports.exec = exec;
exports.execFile = execFile;
exports.spawn = spawn;