CSSfmt

CSSfmt is a tool that automatically formats CSS source code, inspired by Gofmt, and built on top of the PostCSS ecosystem.

CSSfmt can format following code:

Vanilla CSS
SCSS syntax.
Nested selectors syntax like SCSS, Less, Stylus and processor using postcss-nested.

CSSfmt'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!

Example

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;
}

Nested selectors

Input (input.css):

      @media screen and (    min-width :699px)
 {.foo    +       .bar,.hoge{
    font-size   :12px      !   important   ;  ~       .fuga     {
      padding      : 10px       5px;
   color:green;
 >p

 {
        line-height             : 1.5          ;
      }}}
     }                /* comment for .class, #id */


.class,           #id
 {     color       : blue;

  border        :solid  #ddd                1px}

Run the following command:

$ cssfmt input.css

Yield:

@media screen and (min-width: 699px) {
  .foo + .bar,
  .hoge {
    font-size: 12px !important;

    ~ .fuga {
      padding: 10px 5px;
      color: green;

      > p {
        line-height: 1.5;
      }
    }
  }
}

/* comment for .class, #id */
.class,
#id {
  color: blue;
  border: 1px solid #ddd;
}

Installation

$ npm install -g cssfmt

Usage

in Command Line

CLI Help:

$ cssfmt --help

Usage: cssfmt [options] input-file [output-file]

Options:

  -d, --diff        output diff against original file
  -R, --recursive   format files recursively
  -V, --versions    output the version number
  -h, --help        output usage information

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

$ cat input.css | cssfmt

in Node.js

var fs = require('fs');
var postcss = require('postcss');
var fmt = require('cssfmt');

var css = fs.readFileSync('input.css', 'utf-8');

var output = postcss()
  .use(fmt())
  .process(css)
  .css;

in Task Runners

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

Rules

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
open 1 brank line between rules
open 1 brank line between rules in atrules
open 1 brank lines before comments
require new line between a comment and rules
disallow any brank lines between @import

for nested selector syntax

open 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

kristerkari/cssfmt