layaair2-cmd

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For the sake of discussion, let's pretend it's a testing harness you've named `testify`.\n\nEverything 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`.\n\nIt 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:\n\n`['node', '/usr/local/bin/test', '--harmony', 'spec', 'tests.js']`\n\nCrap. 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:\n\n`['node', '--harmony', '/usr/local/bin/test', 'spec', 'tests.js']`\n\nFlagged-respawn fixes this problem and handles all the edge cases respawning creates, such as:\n- Providing a method to determine if a respawn is needed.\n- Piping stderr/stdout from the child into the parent.\n- Making the parent process exit with the same code as the child.\n- If the child is killed, making the parent exit with the same signal.\n\nTo see it in action, clone this repository and run `npm install` / `npm run respawn` / `npm run nospawn`.\n\n## Sample Usage\n\n```js\n#!/usr/bin/env node\n\nconst flaggedRespawn = require('flagged-respawn');\n\n// get a list of all possible v8 flags for the running version of node\nconst v8flags = require('v8flags').fetch();\n\nflaggedRespawn(v8flags, process.argv, function (ready, child) {\n if (ready) {\n console.log('Running!');\n // your cli code here\n } else {\n console.log('Special flags found, respawning.');\n }\n if (process.pid !== child.pid) {\n console.log('Respawned to PID:', child.pid);\n }\n});\n\n```\n\n\n## API\n\n### flaggedRespawn(flags, argv, [ forcedFlags, ] callback) : Void\n\nRespawns 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.\n\n#### Forbid respawning\n\nIf `--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).\n\n#### Parameter:\n\n| Parameter | Type | Description |\n|:--------------|:------:|:----------------------------------------------------|\n| *flags* | Array | An array of node flags and V8 flags which are available when present in *argv*. |\n| *argv* | Array | Command line arguments to respawn. |\n| *forcedFlags* | Array or String | An array of node flags or a string of a single flag and V8 flags for respawning forcely. |\n| *callback* | function | A called function when not respawning or after respawned. |\n\n* **callback(ready, proc, argv) : Void**\n\n *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.)\n\n *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).\n\n **Parameter:**\n\n | Parameter | Type | Description |\n |:----------|:-------:|:--------------------------|\n | *ready* | boolean | True, if not respawning and is ready to execute main function. |\n | *proc* | object | Child process object if respawned, otherwise current process object. |\n | *argv* | Array | An array of command line arguments. |\n\n## License\n\nMIT\n\n[downloads-image]: http://img.shields.io/npm/dm/flagged-respawn.svg\n[npm-url]: https://www.npmjs.com/package/flagged-respawn\n[npm-image]: http://img.shields.io/npm/v/flagged-respawn.svg\n\n[travis-url]: https://travis-ci.org/gulpjs/flagged-respawn\n[travis-image]: http://img.shields.io/travis/gulpjs/flagged-respawn.svg?label=travis-ci\n\n[appveyor-url]: https://ci.appveyor.com/project/gulpjs/flagged-respawn\n[appveyor-image]: https://img.shields.io/appveyor/ci/gulpjs/flagged-respawn.svg?label=appveyor\n\n[coveralls-url]: https://coveralls.io/r/gulpjs/flagged-respawn\n[coveralls-image]: http://img.shields.io/coveralls/gulpjs/flagged-respawn/master.svg\n\n[gitter-url]: https://gitter.im/gulpjs/gulp\n[gitter-image]: https://badges.gitter.im/gulpjs/gulp.svg\n", "readmeFilename": "README.md", "repository": { "type": "git", "url": "git+https://github.com/gulpjs/flagged-respawn.git" }, "scripts": { "cover": "nyc --reporter=lcov --reporter=text-summary npm test", "coveralls": "npm run cover && istanbul-coveralls", "lint": "eslint .", "nospawn": "node test/bin/respawner test", "pretest": "npm run lint", "respawn": "node test/bin/respawner --harmony test", "test": "mocha --async-only" }, "version": "1.0.1" }