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1 # GCSS - Pure Go CSS Preprocessor
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2
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3 [](https://app.wercker.com/project/bykey/4857161fd705e6c43df492e6a33ce87f)
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4 [](https://ci.appveyor.com/project/yosssi/gcss/branch/master)
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5 [](https://coveralls.io/r/yosssi/gcss?branch=master)
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6 [](http://godoc.org/github.com/yosssi/gcss)
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7 [](https://gitter.im/yosssi/gcss?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
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8
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9 ## Overview
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10
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11 GCSS is a pure Go CSS preprocessor. This is inspired by [Sass](http://sass-lang.com/) and [Stylus](http://learnboost.github.io/stylus/).
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12
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13 ## Syntax
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14
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15 ### Variables
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16
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17 ```scss
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18 $base-font: Helvetica, sans-serif
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19 $main-color: blue
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20
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21 body
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22 font: 100% $base-font
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23 color: $main-color
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24 ```
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25
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26 ### Nesting
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27
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28 ```scss
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29 nav
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30 ul
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31 margin: 0
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32 padding: 0
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33
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34 a
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35 color: blue
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36 &:hover
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37 color: red
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38 ```
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39
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40 ### Mixins
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41
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42 ```scss
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43 $border-radius($radius)
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44 -webkit-border-radius: $radius
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45 -moz-border-radius: $radius
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46 -ms-border-radius: $radius
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47 border-radius: $radius
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48
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49 .box
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50 $border-radius(10px)
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51 ```
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52
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53 ## Installation
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54
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55 ```sh
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56 $ go get -u github.com/yosssi/gcss/...
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57 ```
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58
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59 ## Compile from the Command-Line
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60
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61 ```sh
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62 $ gcss /path/to/gcss/file
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63 ```
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64
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65 or
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66
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67 ```sh
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68 $ cat /path/to/gcss/file | gcss > /path/to/css/file
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69 ```
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70
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71 ## Compile from Go programs
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72
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73 You can compile a GCSS file from Go programs by invoking the `gcss.CompileFile` function.
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74
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75 ```go
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76 cssPath, err := gcss.CompileFile("path_to_gcss_file")
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77
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78 if err != nil {
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79 http.Error(w, err.Error(), http.StatusInternalServerError)
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80 return
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81 }
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82
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83 http.ServeFile(w, r, cssPath)
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84 ```
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85
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86 You can invoke the `gcss.Compile` function instead of the `gcss.CompileFile` function. The `gcss.Compile` function takes `io.Writer` and `io.Reader` as a parameter, compiles the GCSS data which is read from the `io.Reader` and writes the result CSS data to the `io.Writer`. Please see the [GoDoc](http://godoc.org/github.com/yosssi/gcss) for the details.
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87
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88 ```go
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89 f, err := os.Open("path_to_gcss_file")
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90
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91 if err != nil {
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92 panic(err)
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93 }
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94
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95 defer func() {
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96 if err := f.Close(); err != nil {
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97 panic(err)
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98 }
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99 }()
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100
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101 n, err := gcss.Compile(os.Stdout, f)
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102 ```
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103
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104 ## Documentation
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105
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106 * [GoDoc](http://godoc.org/github.com/yosssi/gcss)
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107
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108 ## Syntax Highlightings
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109
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110 * [vim-gcss](https://github.com/yosssi/vim-gcss) - Vim syntax highlighting for GCSS
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