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+# GCSS - Pure Go CSS Preprocessor
+
+[![wercker status](https://app.wercker.com/status/4857161fd705e6c43df492e6a33ce87f/m "wercker status")](https://app.wercker.com/project/bykey/4857161fd705e6c43df492e6a33ce87f)
+[![Build status](https://ci.appveyor.com/api/projects/status/ocbu6upgr3j0m3vc/branch/master)](https://ci.appveyor.com/project/yosssi/gcss/branch/master)
+[![Coverage Status](https://img.shields.io/coveralls/yosssi/gcss.svg)](https://coveralls.io/r/yosssi/gcss?branch=master)
+[![GoDoc](http://godoc.org/github.com/yosssi/gcss?status.svg)](http://godoc.org/github.com/yosssi/gcss)
+[![Gitter](https://badges.gitter.im/Join Chat.svg)](https://gitter.im/yosssi/gcss?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
+
+## Overview
+
+GCSS is a pure Go CSS preprocessor. This is inspired by [Sass](http://sass-lang.com/) and [Stylus](http://learnboost.github.io/stylus/).
+
+## Syntax
+
+### Variables
+
+```scss
+$base-font: Helvetica, sans-serif
+$main-color: blue
+
+body
+  font: 100% $base-font
+  color: $main-color
+```
+
+### Nesting
+
+```scss
+nav
+  ul
+    margin: 0
+    padding: 0
+
+a
+  color: blue
+  &:hover
+    color: red
+```
+
+### Mixins
+
+```scss
+$border-radius($radius)
+  -webkit-border-radius: $radius
+  -moz-border-radius: $radius
+  -ms-border-radius: $radius
+  border-radius: $radius
+
+.box
+  $border-radius(10px)
+```
+
+## Installation
+
+```sh
+$ go get -u github.com/yosssi/gcss/...
+```
+
+## Compile from the Command-Line
+
+```sh
+$ gcss /path/to/gcss/file
+```
+
+or
+
+```sh
+$ cat /path/to/gcss/file | gcss > /path/to/css/file
+```
+
+## Compile from Go programs
+
+You can compile a GCSS file from Go programs by invoking the `gcss.CompileFile` function.
+
+```go
+cssPath, err := gcss.CompileFile("path_to_gcss_file")
+
+if err != nil {
+	http.Error(w, err.Error(), http.StatusInternalServerError)
+	return
+}
+
+http.ServeFile(w, r, cssPath)
+```
+
+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.
+
+```go
+f, err := os.Open("path_to_gcss_file")
+
+if err != nil {
+	panic(err)
+}
+
+defer func() {
+	if err := f.Close(); err != nil {
+		panic(err)
+	}
+}()
+
+n, err := gcss.Compile(os.Stdout, f)
+```
+
+## Documentation
+
+* [GoDoc](http://godoc.org/github.com/yosssi/gcss)
+
+## Syntax Highlightings
+
+* [vim-gcss](https://github.com/yosssi/vim-gcss) - Vim syntax highlighting for GCSS