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stylefmt

Modern CSS Formatter


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stylefmt is a tool that automatically formats CSS according to stylelint rules.

stylefmt'd code is:

  • easier to write : never worry about minor formatting concerns while hacking away.
  • easier to read : when all code looks the same you need not mentally convert others' formatting style into something you can understand.
  • easier to maintain : mechanical changes to the source don't cause unrelated changes to the file's formatting; diffs show only the real changes.
  • uncontroversial : never have a debate about spacing or brace position ever again!

Features

  • Supports the latest CSS syntax: Including custom properties, range context for media features, calc() and nesting.
  • Understands CSS-like syntaxes: stylefmt is powered by PostCSS, so it understands any syntax that PostCSS can parse, including SCSS.
  • Works well with stylelint: stylelint is a mighty, modern CSS linter. stylefmt can understand the formatting rules specified in your stylelint configuration file (.stylelintrc).

Examples

Future CSS syntax (cssnext)

Input (input.css):

/* custom properties */
:root{--fontSize: 1rem;
  --mainColor       :#12345678;
--highlightColor:hwb(19035%20%);
}
 
/* custom media queries */
@custom-media
 
--viewport-medium(width<=50rem);
 
/* some var() & calc() */
body{color:var(--mainColor);
    font-size:var(--fontSize);
 line-height: calc(var(--fontSize) * 1.5);
padding: calc((var(--fontSize) / 2) + 1px)}
 
/* custom media query usage */
@media (--viewport-medium) {
body {font-size: calc(var(--fontSize) * 1.2); }
}
 
/* custom selectors */
@custom-selector :--heading h1,h2,h3,    h4,h5,h6;
:--heading { margin-top:0 }
 
/* colors stuff */
a{
color:var(--highlightColor);
    transition:color 1s;
}
a:hover{color  :gray(255,50%) }
a:active{color : rebeccapurple }
a:any-link { color:color(var(--highlightColor) blackness(+20%)) }
 
/* font stuff */
h2 {font-variant-caps:small-caps;
}table{font-variant-numeric: lining-nums;
}
 
/* filters */
.blur{filter:blur(4px)}.sepia{
filter: sepia(.8);}
 

Yield:

/* custom properties */
:root {
  --fontSize: 1rem;
  --mainColor: #12345678;
  --highlightColor: hwb(19035%20%);
}
 
/* custom media queries */
@custom-media --viewport-medium (width <= 50rem);
 
/* some var() & calc() */
body {
  color: var(--mainColor);
  font-size: var(--fontSize);
  line-height: calc(var(--fontSize) * 1.5);
  padding: calc((var(--fontSize) / 2) + 1px);
}
 
/* custom media query usage */
@media (--viewport-medium) {
  body {
    font-size: calc(var(--fontSize) * 1.2);
  }
}
 
/* custom selectors */
@custom-selector :--heading h1h2h3h4h5h6;
 
:--heading {
  margin-top: 0;
}
 
/* colors stuff */
a {
  color: var(--highlightColor);
  transition: color 1s;
}
 
a:hover {
  color: gray(25550%);
}
 
a:active {
  color: rebeccapurple;
}
 
a:any-link {
  color: color(var(--highlightColor) blackness(+20%));
}
 
/* font stuff */
h2 {
  font-variant-caps: small-caps;
}
 
table {
  font-variant-numeric: lining-nums;
}
 
/* filters */
.blur {
  filter: blur(4px);
}
 
.sepia {
  filter: sepia(.8);
}
 

SCSS syntax

Input (input.scss):

// mixin for clearfix 
 
 
        @mixin      clearfix    ()      { &:before,
  &:after {
                content:" ";
    display              : table;  }
 
  &:after        {clear: both;}
   }.class
{
       padding:10px;@include        clearfix();}
     .base {  color: red;  }
 
// placeholder 
%base
{
 
 
padding: 12px
}
 
.foo{
@extend      .base;}
 
.bar
      {     @extend            %base;
 
}

Yield:

// mixin for clearfix 
@mixin clearfix () {
  &:before,
  &:after {
    content: " ";
    display: table;
  }
 
  &:after {
    clear: both;
  }
}
 
.class {
  padding: 10px;
  @include clearfix();
}
 
.base {
  color: red;
}
 
// placeholder 
%base {
  padding: 12px;
}
 
.foo {
  @extend .base;
}
 
.bar {
  @extend %base;
}

Installation

$ npm install stylefmt

Usage

in Command Line

CLI Help:

$ stylefmt --help
Usage: stylefmt [options] input-name [output-name]
 
Options:
 
  -b, --config-basedir   Path to the directory that relative paths defining "extends"
  -c, --config           Path to a specific configuration file (JSON, YAML, or CommonJS)
  -d, --diff             Output diff against original file
  -r, --recursive        Format list of space seperated files(globs) in place
  -v, --version          Output the version number
  -h, --help             Output usage information
  -i, --ignore-path      Path to a file containing patterns that describe files to ignore.
  --stdin-filename       A filename to assign stdin input.

stylefmt can also read a file from stdin if there are no input-file as argument in CLI.

$ cat input.css | stylefmt --stdin-filename input.css

in Node.js

var fs = require('fs');
var postcss = require('postcss');
var scss = require('postcss-scss'); // when you use scss syntax 
var stylefmt = require('stylefmt');
 
var css = fs.readFileSync('input.css', 'utf-8');
 
postcss([
  stylefmt
]).process(css, {
    from: 'input.css',
    syntax: scss
  })
  .then(function (result) {
    result.css; // formatted code 
  });

in Task Runners

We can use stylefmt in Grunt, gulp, and Fly.

stylelint rules that stylefmt can handle

stylefmt ❤️ stylelint

stylefmt supports the following stylelint rules:

and we can also format from the other stylelint's configration files or packages (e.g. stylelint-config-standard, stylelint-config-suitcss and so on) using extends property.

Default formatting rules (without stylelint config file)

Basic

  • 2 spaces indentation
  • require 1 space between a simple selector and combinator
  • require 1 space between selectors and {
  • require new line after {
  • disallow any spaces between property and :
  • require 1 space between : and values
  • require new line after declarations
  • require ; in last declaration
  • require 1 space between values and !important
  • disallow any spaces between ! and important
  • leave 1 blank line between rules
  • leave 1 blank line between rules in atrules
  • disallow any blank lines between @import

for nested selector syntax

  • leave 1 line between declarations and nested rules

SCSS

  • require 1 space between @mixin and mixin name
  • require 1 space between mixin name and (
  • require 1 space between @extend and base rules
  • require 1 space between @include and mixin name
  • disallow any spaces between $variable and :
  • require 1 space between : and name of variable

Option projects

Editor plugins

for Task Runners

License

The MIT License (MIT)

Copyright (c) 2015 Masaaki Morishita