151 lines
5.8 KiB
Markdown
151 lines
5.8 KiB
Markdown
[![npm][npm]][npm-url]
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[![node][node]][node-url]
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[](https://greenkeeper.io/)
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[![tests][tests]][tests-url]
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[![cover][cover]][cover-url]
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[![chat][chat]][chat-url]
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<div align="center">
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<img width="100" height="100" title="CLI" src="http://postcss.github.io/postcss-cli/logo.svg">
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<a href="https://github.com/postcss/postcss">
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<img width="110" height="110" title="PostCSS" src="http://postcss.github.io/postcss/logo.svg" hspace="10">
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</a>
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<h1>PostCSS CLI</h1>
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</div>
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<h2 align="center">Install</h2>
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```bash
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npm i -g|-D postcss-cli
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```
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<h2 align="center">Usage</h2>
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```
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Usage:
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postcss [input.css] [OPTIONS] [-o|--output output.css] [--watch|-w]
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postcss <input.css>... [OPTIONS] --dir <output-directory> [--watch|-w]
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postcss <input-directory> [OPTIONS] --dir <output-directory> [--watch|-w]
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postcss <input-glob-pattern> [OPTIONS] --dir <output-directory> [--watch|-w]
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postcss <input.css>... [OPTIONS] --replace
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Basic options:
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-o, --output Output file [string]
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-d, --dir Output directory [string]
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-r, --replace Replace (overwrite) the input file [boolean]
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-m, --map Create an external sourcemap
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--no-map Disable the default inline sourcemaps
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-w, --watch Watch files for changes and recompile as needed [boolean]
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--verbose Be verbose [boolean]
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--env A shortcut for setting NODE_ENV [string]
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Options for use without a config file:
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-u, --use List of postcss plugins to use [array]
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--parser Custom postcss parser [string]
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--stringifier Custom postcss stringifier [string]
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--syntax Custom postcss syntax [string]
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Options for use with --dir:
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--ext Override the output file extension; for use with --dir [string]
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--base Mirror the directory structure relative to this path in the output
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directory, for use with --dir [string]
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Advanced options:
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--include-dotfiles Enable glob to match files/dirs that begin with "."
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[boolean]
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--poll Use polling for file watching. Can optionally pass polling
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interval; default 100 ms
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--config Set a custom directory to look for a config file [string]
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Options:
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--version Show version number [boolean]
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-h, --help Show help [boolean]
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Examples:
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postcss input.css -o output.css Basic usage
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postcss src/**/*.css --base src --dir build Glob Pattern & output
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cat input.css | postcss -u autoprefixer > output.css Piping input & output
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If no input files are passed, it reads from stdin. If neither -o, --dir, or
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--replace is passed, it writes to stdout.
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If there are multiple input files, the --dir or --replace option must be passed.
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Input files may contain globs (e.g. src/**/*.css). If you pass an input
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directory, it will process all files in the directory and any subdirectories,
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respecting the glob pattern.
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```
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> ℹ️ More details on custom parsers, stringifiers and syntaxes, can be found [here](https://github.com/postcss/postcss#syntaxes).
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### [Config](https://github.com/michael-ciniawsky/postcss-load-config)
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If you need to pass options to your plugins, or have a long plugin chain, you'll want to use a configuration file.
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**postcss.config.js**
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```js
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module.exports = {
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parser: 'sugarss',
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plugins: [
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require('postcss-import')({ ...options }),
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require('postcss-url')({ url: 'copy', useHash: true }),
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],
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}
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```
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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.
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### Context
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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**
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| Name | Type | Default | Description |
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| :-------: | :--------: | :--------------------------------: | :------------------- |
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| `env` | `{String}` | `'development'` | process.env.NODE_ENV |
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| `file` | `{Object}` | `dirname, basename, extname` | File |
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| `options` | `{Object}` | `map, parser, syntax, stringifier` | PostCSS Options |
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**postcss.config.js**
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```js
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module.exports = (ctx) => ({
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map: ctx.options.map,
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parser: ctx.file.extname === '.sss' ? 'sugarss' : false,
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plugins: {
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'postcss-import': { root: ctx.file.dirname },
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cssnano: ctx.env === 'production' ? {} : false,
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},
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})
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```
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> ⚠️ If you want to set options via CLI, it's mandatory to reference `ctx.options` in `postcss.config.js`
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```bash
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postcss input.sss -p sugarss -o output.css -m
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```
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**postcss.config.js**
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```js
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module.exports = (ctx) => ({
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map: ctx.options.map,
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parser: ctx.options.parser,
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plugins: {
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'postcss-import': { root: ctx.file.dirname },
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cssnano: ctx.env === 'production' ? {} : false,
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},
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})
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```
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[npm]: https://img.shields.io/npm/v/postcss-cli.svg
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[npm-url]: https://npmjs.com/package/postcss-cli
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[node]: https://img.shields.io/node/v/postcss-cli.svg
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[node-url]: https://nodejs.org/
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[tests]: http://img.shields.io/travis/postcss/postcss-cli/master.svg
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[tests-url]: https://travis-ci.org/postcss/postcss-cli
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[cover]: https://img.shields.io/coveralls/postcss/postcss-cli/master.svg
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[cover-url]: https://coveralls.io/github/postcss/postcss-cli
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[chat]: https://img.shields.io/gitter/room/postcss/postcss.svg
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[chat-url]: https://gitter.im/postcss/postcss
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