install gulp
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Copyright (c) 2014 Tyler Kellen
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use,
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copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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# flagged-respawn [](http://travis-ci.org/js-cli/js-flagged-respawn)
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> A tool for respawning node binaries when special flags are present.
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[](https://nodei.co/npm/flagged-respawn/)
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## What is it?
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Say you wrote a command line tool that runs arbitrary javascript (e.g. task runner, test framework, etc). For the sake of discussion, let's pretend it's a testing harness you've named `testify`.
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Everything is going splendidly until one day you decide to test some code that relies on a feature behind a v8 flag in node (`--harmony`, for example). Without much thought, you run `testify --harmony spec tests.js`.
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It doesn't work. After digging around for a bit, you realize this produces a [`process.argv`](http://nodejs.org/docs/latest/api/process.html#process_process_argv) of:
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`['node', '/usr/local/bin/test', '--harmony', 'spec', 'tests.js']`
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Crap. The `--harmony` flag is in the wrong place! It should be applied to the **node** command, not our binary. What we actually wanted was this:
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`['node', '--harmony', '/usr/local/bin/test', 'spec', 'tests.js']`
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Flagged-respawn fixes this problem and handles all the edge cases respawning creates, such as:
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- Providing a method to determine if a respawn is needed.
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- Piping stderr/stdout from the child into the parent.
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- Making the parent process exit with the same code as the child.
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- If the child is killed, making the parent exit with the same signal.
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To see it in action, clone this repository and run `npm install` / `npm run respawn` / `npm run nospawn`.
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## Sample Usage
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```js
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#!/usr/bin/env node
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const flaggedRespawn = require('flagged-respawn');
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// get a list of all possible v8 flags for the running version of node
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const v8flags = require('v8flags').fetch();
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flaggedRespawn(v8flags, process.argv, function (ready, child) {
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if (ready) {
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console.log('Running!');
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// your cli code here
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} else {
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console.log('Special flags found, respawning.');
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}
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if (process.pid !== child.pid) {
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console.log('Respawned to PID:', child.pid);
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}
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});
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```
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## API
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### <u>flaggedRespawn(flags, argv, [ forcedFlags, ] callback) : Void</u>
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Respawns the script itself when *argv* has special flag contained in *flags* and/or *forcedFlags* is not empty. Because members of *flags* and *forcedFlags* are passed to `node` command, each of them needs to be a node flag or a V8 flag.
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#### Forbid respawning
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If `--no-respawning` flag is given in *argv*, this function does not respawned even if *argv* contains members of flags or *forcedFlags* is not empty. (This flag is also used internally to prevent from respawning more than once).
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#### Parameter:
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| Parameter | Type | Description |
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|:--------------|:------:|:----------------------------------------------------|
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| *flags* | Array | An array of node flags and V8 flags which are available when present in *argv*. |
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| *argv* | Array | Command line arguments to respawn. |
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| *forcedFlags* | Array or String | An array of node flags or a string of a single flag and V8 flags for respawning forcely. |
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| *callback* | function | A called function when not respawning or after respawned. |
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* **<u><i>callback</i>(ready, proc, argv) : Void</u>**
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*callback* function is called both when respawned or not, and it can be distinguished by callback's argument: *ready*. (*ready* indicates whether a process spawned its child process (false) or not (true), but it does not indicate whether a process is a spawned child process or not. *ready* for a spawned child process is true.)
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*argv* is an array of command line arguments which is respawned (when *ready* is false) or is passed current process except flags within *flags* and `--no-respawning` (when *ready* is true).
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**Parameter:**
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| Parameter | Type | Description |
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|:----------|:-------:|:--------------------------|
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| *ready* | boolean | True, if not respawning and is ready to execute main function. |
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| *proc* | object | Child process object if respawned, otherwise current process object. |
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| *argv* | Array | An array of command line arguments. |
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## Release History
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* 2017-12-16 - v1.0.0 - Force/Forbid respawn, Improved API & testing
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* 2016-03-22 - v0.3.2 - fix issue with v8 flags values being dropped
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* 2014-09-12 - v0.3.1 - use `{ stdio: 'inherit' }` for spawn to maintain colors
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* 2014-09-11 - v0.3.0 - for real this time
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* 2014-09-11 - v0.2.0 - cleanup
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* 2014-09-04 - v0.1.1 - initial release
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const reorder = require('./lib/reorder');
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const respawn = require('./lib/respawn');
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const remover = require('./lib/remover');
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const FORBID_RESPAWNING_FLAG = '--no-respawning';
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module.exports = function (flags, argv, forcedFlags, execute) {
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if (!flags) {
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throw new Error('You must specify flags to respawn with.');
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}
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if (!argv) {
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throw new Error('You must specify an argv array.');
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}
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if (typeof forcedFlags === 'function') {
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execute = forcedFlags;
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forcedFlags = [];
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}
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if (typeof forcedFlags === 'string') {
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forcedFlags = [forcedFlags];
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}
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if (!Array.isArray(forcedFlags)) {
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forcedFlags = [];
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}
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var index = argv.indexOf(FORBID_RESPAWNING_FLAG);
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if (index >= 0) {
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argv = argv.slice(0, index).concat(argv.slice(index + 1));
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argv = remover(flags, argv);
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execute(true, process, argv);
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return;
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}
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var proc = process;
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var reordered = reorder(flags, argv);
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var ready = JSON.stringify(argv) === JSON.stringify(reordered);
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if (forcedFlags.length) {
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reordered = reordered.slice(0, 1)
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.concat(forcedFlags)
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.concat(reordered.slice(1));
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ready = false;
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}
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if (!ready) {
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reordered.push(FORBID_RESPAWNING_FLAG);
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proc = respawn(reordered);
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}
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execute(ready, proc, reordered);
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};
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function isV8flags(flag, v8flags) {
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return v8flags.indexOf(replaceSeparatorsFromDashesToUnderscores(flag)) >= 0;
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}
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function replaceSeparatorsFromDashesToUnderscores(flag) {
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var arr = /^(-+)(.*)$/.exec(flag);
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if (!arr) {
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return flag;
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}
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return arr[1] + arr[2].replace(/\-/g, '_');
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}
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module.exports = isV8flags;
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const isV8flags = require('./is-v8flags');
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module.exports = function(flags, argv) {
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var args = argv.slice(0, 1);
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for (var i = 1, n = argv.length; i < n; i++) {
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var arg = argv[i];
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var flag = arg.split('=')[0];
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if (!isV8flags(flag, flags)) {
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args.push(arg);
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}
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}
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return args;
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};
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const isV8flags = require('./is-v8flags');
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module.exports = function (flags, argv) {
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if (!argv) {
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argv = process.argv;
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}
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var args = [argv[1]];
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argv.slice(2).forEach(function (arg) {
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var flag = arg.split('=')[0];
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if (isV8flags(flag, flags)) {
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args.unshift(arg);
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} else {
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args.push(arg);
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}
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});
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args.unshift(argv[0]);
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return args;
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};
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const spawn = require('child_process').spawn;
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module.exports = function (argv) {
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var child = spawn(argv[0], argv.slice(1), { stdio: 'inherit' });
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child.on('exit', function (code, signal) {
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process.on('exit', function () {
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/* istanbul ignore if */
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if (signal) {
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process.kill(process.pid, signal);
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} else {
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process.exit(code);
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}
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});
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});
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return child;
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};
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{
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"_from": "flagged-respawn@^1.0.0",
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"_id": "flagged-respawn@1.0.0",
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"_inBundle": false,
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"_integrity": "sha1-Tnmumy6zi/hrO7Vr8+ClaqX8q9c=",
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"_location": "/flagged-respawn",
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"_phantomChildren": {},
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"_requested": {
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"type": "range",
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"registry": true,
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"raw": "flagged-respawn@^1.0.0",
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"name": "flagged-respawn",
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"escapedName": "flagged-respawn",
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"rawSpec": "^1.0.0",
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"saveSpec": null,
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"fetchSpec": "^1.0.0"
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},
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"_requiredBy": [
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"/liftoff"
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],
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"_resolved": "https://registry.npmjs.org/flagged-respawn/-/flagged-respawn-1.0.0.tgz",
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"_shasum": "4e79ae9b2eb38bf86b3bb56bf3e0a56aa5fcabd7",
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"_spec": "flagged-respawn@^1.0.0",
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"_where": "/mnt/data/Sites/anissabensalah.net/user/themes/anissabensalah/node_modules/liftoff",
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"author": {
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"name": "Tyler Kellen",
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"url": "http://goingslowly.com/"
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},
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"bugs": {
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"url": "https://github.com/js-cli/js-flagged-respawn/issues"
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},
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"bundleDependencies": false,
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"deprecated": false,
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"description": "A tool for respawning node binaries when special flags are present.",
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"devDependencies": {
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"chai": "^3.5.0",
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"jscs": "^3.0.7",
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"jshint": "^2.9.5",
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"mocha": "^3.5.3",
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"nyc": "^11.3.0",
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"v8flags": "^3.0.1"
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},
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"engines": {
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"node": ">= 0.8.0"
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},
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"files": [
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"index.js",
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"lib/"
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],
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"homepage": "https://github.com/js-cli/js-flagged-respawn",
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"keywords": [
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"respawn flags"
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],
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"license": "MIT",
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"main": "index.js",
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"name": "flagged-respawn",
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"repository": {
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"type": "git",
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"url": "git://github.com/js-cli/js-flagged-respawn.git"
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},
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"scripts": {
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"cover": "nyc --reporter=lcov --reporter=text-summary npm test",
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"lint": "jshint index.js lib/ && jscs index.js lib/",
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"nospawn": "node test/bin/respawner test",
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"respawn": "node test/bin/respawner --harmony test",
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"test": "npm run lint && mocha -R spec test"
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},
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"version": "1.0.0"
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}
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