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Status](https://travis-ci.org/shinnn/spawn-stack.svg?branch=master)](https://travis-ci.org/shinnn/spawn-stack)\n[![Build status](https://ci.appveyor.com/api/projects/status/stybf1ffx07eejur/branch/master?svg=true)](https://ci.appveyor.com/project/ShinnosukeWatanabe/spawn-stack/branch/master)\n[![Coverage Status](https://coveralls.io/repos/github/shinnn/spawn-stack/badge.svg?branch=master)](https://coveralls.io/github/shinnn/spawn-stack?branch=master)\n\n[Spawn](https://en.wikipedia.org/wiki/Spawn_(computing)) a new process using [`stack`](https://docs.haskellstack.org/en/stable/README/) command with the given arguments\n\n```javascript\nconst spawnStack = require('spawn-stack');\n\nspawnStack(['--version']).then(result =\u003e {\n  result.output; //=\u003e 'Version 1.7.1 x86_64 ...'\n});\n```\n\n## Installation\n\nMake sure [`stack`](https://github.com/commercialhaskell/stack) command is [installed](https://docs.haskellstack.org/en/stable/README/#how-to-install) in your `$PATH`, then [install](https://docs.npmjs.com/cli/install) `spawn-stack` via [npm](https://docs.npmjs.com/getting-started/what-is-npm) CLI.\n\n```\nnpm install spawn-stack\n```\n\n## API\n\n```javascript\nconst spawnStack = require('spawn-stack');\n```\n\n### spawnStack(*args* [, *options*])\n\n*args*: `Array\u003cstring\u003e` (command line arguments passed to `stack` command)  \n*options*: `Object` (`execa` options, with [`preferLocal`](https://github.com/sindresorhus/execa#preferlocal) defaulting to `false`)  \nReturn: [`ChildProcess`](https://nodejs.org/api/child_process.html#child_process_class_childprocess)\n\nIt returns the same value as [`execa`](https://github.com/sindresorhus/execa#execafile-arguments-options)'s:\n\n\u003e a `child_process` instance, which is enhanced to also be a `Promise` for a result `Object` with `stdout` and `stderr` properties.\n\nOn POSIX, [`--allow-different-user`](https://github.com/commercialhaskell/stack/blob/v1.5.1/doc/yaml_configuration.md#allow-different-user) flag will be automatically enabled to prevent file permission problems, unless `--no-allow-different-user` flag is explicitly provided.\n\n```javascript\nprocess.platform !== 'win32'; //=\u003e true\n\nspawnStack(['--numeric-version']).then(result =\u003e {\n  result.cmd; // 'stack --allow-different-user --numeric-version'\n});\n\nspawnStack(['--no-allow-different-user', '--numeric-version']).then(result =\u003e {\n  result.cmd; // 'stack --no-allow-different-user --numeric-version'\n});\n```\n\nThe return value also has [`Symbol.observable`](https://tc39.github.io/proposal-observable/#observable-prototype-@@observable) method that returns a [zen-observable](https://github.com/zenparsing/zen-observable) instance passing each line of `stderr` to its [`Subscription`](https://tc39.github.io/proposal-observable/#subscription-objects). That means you can convert the return value into an [`Observable`](https://github.com/tc39/proposal-observable#observable) by using [`Observable.from`](https://github.com/tc39/proposal-observable#observablefrom).\n\n```javascript\nconst Observable = require('zen-observable');\nconst spawnStack = require('spawn-stack');\n\nconst cp = spawnStack(['setup', '8.2.1']);\n\nObservable.from(cp).subscribe({\n  next(line) {\n    console.log(line);\n    // stack will use a sandboxed GHC it installed ...\n  },\n  complete() {\n    console.log('Done.')\n  }\n});\n```\n\n## License\n\n[ISC License](./LICENSE) © 2017 - 2018 Shinnosuke Watanabe\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fshinnn%2Fspawn-stack","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fshinnn%2Fspawn-stack","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fshinnn%2Fspawn-stack/lists"}