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PostCSS CLI

Install

```bash npm i -g|-D postcss-cli ```

Usage

``` Usage: postcss [input.css] [OPTIONS] [-o|--output output.css] [--watch|-w] postcss ... [OPTIONS] --dir [--watch|-w] postcss [OPTIONS] --dir [--watch|-w] postcss [OPTIONS] --dir [--watch|-w] postcss ... [OPTIONS] --replace Basic options: -o, --output Output file [string] -d, --dir Output directory [string] -r, --replace Replace (overwrite) the input file [boolean] --map, -m Create an external sourcemap --no-map Disable the default inline sourcemaps --verbose Be verbose [boolean] --watch, -w Watch files for changes and recompile as needed [boolean] --env A shortcut for setting NODE_ENV [string] Options for when not using a config file: -u, --use List of postcss plugins to use [array] --parser Custom postcss parser [string] --stringifier Custom postcss stringifier [string] --syntax Custom postcss syntax [string] Advanced options: --ext Override the output file extension; for use with --dir [string] --base Mirror the directory structure relative to this path in the output directory, for use with --dir [string] --poll Use polling for file watching. Can optionally pass polling interval; default 100 ms --config Set a custom path to look for a config file [string] Options: --version Show version number [boolean] -h, --help Show help [boolean] Examples: postcss input.css -o output.css Basic usage postcss src/**/*.css --base src --dir build Glob Pattern & output cat input.css | postcss -u autoprefixer > output.css Piping input & output If no input files are passed, it reads from stdin. If neither -o, --dir, or --replace is passed, it writes to stdout. If there are multiple input files, the --dir or --replace option must be passed. Input files may contain globs (ie: src/**/*.css). If you pass an input directory, it will process all files in the directory and any subdirectories, respecting the glob pattern. ``` > ℹ️ More details on custom parsers, stringifiers and syntaxes, can be found [here](https://github.com/postcss/postcss#syntaxes). ### [Config](https://github.com/michael-ciniawsky/postcss-load-config) If you need to pass options to your plugins, or have a long plugin chain, you'll want to use a configuration file. **postcss.config.js** ```js module.exports = { parser: 'sugarss', plugins: [ require('postcss-import')({ ...options }), require('postcss-url')({ url: 'copy', useHash: true }) ] } ``` Note that you **can not** set the `from` or `to` options for postcss in the config file. They are set automatically based on the CLI arguments. ### Context For more advanced usage it's recommend to to use a function in `postcss.config.js`, this gives you access to the CLI context to dynamically apply options and plugins **per file** | Name | Type | Default | Description | | :-------: | :--------: | :--------------------------------: | :------------------- | | `env` | `{String}` | `'development'` | process.env.NODE_ENV | | `file` | `{Object}` | `dirname, basename, extname` | File | | `options` | `{Object}` | `map, parser, syntax, stringifier` | PostCSS Options | **postcss.config.js** ```js module.exports = ctx => ({ map: ctx.options.map, parser: ctx.file.extname === '.sss' ? 'sugarss' : false, plugins: { 'postcss-import': { root: ctx.file.dirname }, cssnano: ctx.env === 'production' ? {} : false } }) ``` > ⚠️ If you want to set options via CLI, it's mandatory to reference `ctx.options` in `postcss.config.js` ```bash postcss input.sss -p sugarss -o output.css -m ``` **postcss.config.js** ```js module.exports = ctx => ({ map: ctx.options.map, parser: ctx.options.parser, plugins: { 'postcss-import': { root: ctx.file.dirname }, cssnano: ctx.env === 'production' ? {} : false } }) ``` [npm]: https://img.shields.io/npm/v/postcss-cli.svg [npm-url]: https://npmjs.com/package/postcss-cli [node]: https://img.shields.io/node/v/postcss-cli.svg [node-url]: https://nodejs.org/ [deps]: https://img.shields.io/gemnasium/postcss/postcss-cli.svg [deps-url]: https://gemnasium.com/postcss/postcss-cli [tests]: http://img.shields.io/travis/postcss/postcss-cli/master.svg [tests-url]: https://travis-ci.org/postcss/postcss-cli [cover]: https://img.shields.io/coveralls/postcss/postcss-cli/master.svg [cover-url]: https://coveralls.io/github/postcss/postcss-cli [chat]: https://img.shields.io/gitter/room/postcss/postcss.svg [chat-url]: https://gitter.im/postcss/postcss