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The mustache template language in Go

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Readme.md

Overview

mustache.go is an implementation of the mustache template language in Go. It is better suited for website templates than Go's native pkg/template. mustache.go is fast -- it parses templates efficiently and stores them in a tree-like structure which allows for fast execution.

Documentation

For more information about mustache, check out the mustache project page or the mustache manual.

Also check out some example mustache files

Installation

To install mustache.go, simply run go get github.com/hoisie/mustache. To use it in a program, use import "github.com/hoisie/mustache"

Usage

There are four main methods in this package:

func Render(data string, context ...interface{}) string

func RenderFile(filename string, context ...interface{}) string

func ParseString(data string) (*template, os.Error)

func ParseFile(filename string) (*template, os.Error) 

There are also two additional methods for using layouts (explained below).

The Render method takes a string and a data source, which is generally a map or struct, and returns the output string. If the template file contains an error, the return value is a description of the error. There's a similar method, RenderFile, which takes a filename as an argument and uses that for the template contents.

data := mustache.Render("hello {{c}}", map[string]string{"c":"world"})
println(data)

If you're planning to render the same template multiple times, you do it efficiently by compiling the template first:

tmpl,_ := mustache.ParseString("hello {{c}}")
var buf bytes.Buffer;
for i := 0; i < 10; i++ {
    tmpl.Render (map[string]string { "c":"world"}, &buf)  
}

For more example usage, please see mustache_test.go

Escaping

mustache.go follows the official mustache HTML escaping rules. That is, if you enclose a variable with two curly brackets, {{var}}, the contents are HTML-escaped. For instance, strings like 5 > 2 are converted to 5 &gt; 2. To use raw characters, use three curly brackets {{{var}}}.

Layouts

It is a common pattern to include a template file as a "wrapper" for other templates. The wrapper may include a header and a footer, for instance. Mustache.go supports this pattern with the following two methods:

func RenderInLayout(data string, layout string, context ...interface{}) string

func RenderFileInLayout(filename string, layoutFile string, context ...interface{}) string

The layout file must have a variable called {{content}}. For example, given the following files:

layout.html.mustache:

<html>
<head><title>Hi</title></head>
<body>
{{{content}}}
</body>
</html>

template.html.mustache:

<h1> Hello World! </h1>

A call to RenderFileInLayout("template.html.mustache", "layout.html.mustache", nil) will produce:

<html>
<head><title>Hi</title></head>
<body>
<h1> Hello World! </h1>
</body>
</html>

A note about method receivers

Mustache.go supports calling methods on objects, but you have to be aware of Go's limitations. For example, lets's say you have the following type:

type Person struct {
    FirstName string
    LastName string    
}

func (p *Person) Name1() string {
    return p.FirstName + " " + p.LastName
}

func (p Person) Name2() string {
    return p.FirstName + " " + p.LastName
}

While they appear to be identical methods, Name1 has a pointer receiver, and Name2 has a value receiver. Objects of type Person(non-pointer) can only access Name2, while objects of type *Person(person) can access both. This is by design in the Go language.

So if you write the following:

mustache.Render("{{Name1}}", Person{"John", "Smith"})

It'll be blank. You either have to use &Person{"John", "Smith"}, or call Name2

Supported features

  • Variables
  • Comments
  • Change delimiter
  • Sections (boolean, enumerable, and inverted)
  • Partials
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