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index.js
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index.js
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'use strict';
/*
Copyright 2014 Yahoo! Inc. All rights reserved.
Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
*/
/*jslint nomen: true */
var util = require('util'),
EventEmitter = require('events').EventEmitter,
through = require('through'),
stream = require('stream'),
lastPid = 1;
function MockProcess(runner, signals) {
var that = this,
streamer = function () {
/* istanbul ignore next - fallback */
return stream.PassThrough ? new stream.PassThrough() : through();
},
emitted = false,
emitter = function () {
if (!emitted) {
emitted = true;
that.emit('close', that.exitCode, that.signal);
}
};
EventEmitter.call(this);
this.stdin = streamer();
this.stdout = streamer();
this.stderr = streamer();
this.stderr.on('end', emitter);
this.stderr.on('finish', emitter);
this.stderr.on('close', emitter);
/* istanbul ignore next - polyfill */
if (!this.stdout.setEncoding) {
this.stdout.setEncoding = this.stderr.setEncoding = function (encoding) {
this.encoding = encoding;
};
}
this._runner = runner;
this.signal = null;
if(signals){
this.signals = signals;
}
}
util.inherits(MockProcess, EventEmitter);
MockProcess.prototype._start = function (command, args, opts) {
var that = this,
runner = this._runner;
this.command = command;
this.args = args;
this.opts = opts;
this.pid = lastPid;
this.ended = false;
lastPid += 1;
if(runner.throws instanceof Error){
throw runner.throws;
}
process.nextTick(function () {
runner.call(that, function (exitCode) {
if(!that.ended){
that.ended = true;
that.exitCode = exitCode;
that.emit('exit', exitCode);
that.stdout.end();
that.stderr.end();
}
});
});
return this;
};
MockProcess.prototype.kill = function (signal) {
signal = signal || 'SIGTERM';
var that = this;
// if the signals object contains this signal and is *truthy*, and it is still running, exit
if(this.signals[signal]){
this.signal = signal;
/* istanbul ignore else - no-op if ended */
if(!this.ended){
this.ended = true;
process.nextTick(function(){
that.emit('exit',null,signal);
that.stdout.end();
that.stderr.end();
});
}
}
};
var ezRunner = function (exitCode, stdout, stderr) {
var verbose,
fn = function (cb) {
if (verbose) {
console.log('Run:' + this.command + ', with args');
console.log(this.args);
console.log('With stdout = ' + stdout);
console.log('With stderr = ' + stderr);
console.log('Exit code = ' + exitCode);
}
if (stdout) {
this.stdout.write(stdout);
}
if (stderr) {
this.stderr.write(stderr);
}
process.nextTick(function () {
return cb(exitCode);
});
};
fn.setVerbose = function (v) {
verbose = !!v;
return fn;
};
return fn;
};
function makeSeq(verbose) {
var runners = [],
fn = function (/* command, args, opts */) {
var runner;
if (runners.length) {
if (verbose) {
console.log('Running first of ' + runners.length +
' remaining functions');
}
runner = runners.shift();
} else if (verbose) {
console.log('No runners left, using default');
}
return runner;
};
fn.add = function (runner) {
runners.push(runner);
};
return fn;
}
function ProcessList(verbose) {
this.verbose = verbose;
this.fns = [];
this.defaultFn = ezRunner(0).setVerbose(verbose);
this.strategy = null;
this.calls = [];
}
ProcessList.prototype.setStrategy = function (strategy) {
this.strategy = strategy;
};
ProcessList.prototype.setSignals = function (sigs) {
this.signals = sigs;
};
ProcessList.prototype.next = function (command, args, opts) {
var runner,
mp;
if (this.strategy) {
runner = this.strategy(command, args, opts);
}
runner = runner || this.defaultFn;
mp = new MockProcess(runner,this.signals);
this.calls.push(mp);
return mp._start(command, args, opts);
};
ProcessList.prototype.__defineGetter__('sequence', function () {
if (!this.strategy) {
this.strategy = makeSeq(this.verbose);
}
return this.strategy;
});
module.exports = function (verbose) {
var pm = new ProcessList(verbose),
main = function (command, args, opts) {
return pm.next(command, args, opts);
};
main.__defineGetter__('sequence', function () { return pm.sequence; });
main.__defineGetter__('calls', function () { return pm.calls.slice(); });
main.setDefault = function (fn) { pm.defaultFn = fn; };
main.setStrategy = function (s) { pm.setStrategy(s); };
main.simple = function (exitCode, stdout, stderr) {
return ezRunner(exitCode, stdout, stderr).setVerbose(verbose);
};
main.setSignals = function (sigs) { pm.setSignals(sigs); };
return main;
};