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mustache(5) -- Logic-less templates.
====================================
## SYNOPSIS
A typical Mustache template:
Hello {{name}}
You have just won ${{value}}!
{{#in_ca}}
Well, ${{taxed_value}}, after taxes.
{{/in_ca}}
Given the following hash:
{
"name": "Chris",
"value": 10000,
"taxed_value": 10000 - (10000 * 0.4),
"in_ca": true
}
Will produce the following:
Hello Chris
You have just won $10000!
Well, $6000.0, after taxes.
## DESCRIPTION
Mustache can be used for HTML, config files, source code -
anything. It works by expanding tags in a template using values
provided in a hash or object.
We call it "logic-less" because there are no if statements, else
clauses, or for loops. Instead there are only tags. Some tags are
replaced with a value, some nothing, and others a series of
values. This document explains the different types of Mustache tags.
## TAG TYPES
Tags are indicated by the double mustaches. `{{name}}` is a tag. Let's
talk about the different types of tags.
<
8000
div>
### Variables
The most basic tag is the variable. A `{{name}}` tag in a basic
template will try to call the `name` method on your view. If there is
no `name` method, an exception will be raised.
All variables are HTML escaped by default. If you want to return
unescaped HTML, use the triple mustache: `{{{name}}}`.
By default a variable "miss" returns an empty string. This can usually
be configured in your Mustache library.
Template:
* {{name}}
* {{age}}
* {{company}}
* {{{company}}}
Hash:
{
"name": "Chris",
"company": "<b>GitHub</b>"
}
Output:
* Chris
*
* <b>GitHub</b>
* <b>GitHub</b>
### Boolean Sections
A section begins with a pound and ends with a slash. That is,
`{{#person}}` begins a "person" section while `{{/person}}` ends it.
If the `person` key exists and calling it returns false, the HTML
between the pound and slash will not be displayed.
If the `person` method exists and calling it returns true, the HTML
between the pound and slash will be rendered and displayed.
Template:
{{#person}}
Shown!
{{/person}}
{{#anything_else}}
Never shown!
{{/anything_else}}
Hash:
{
"person": true
}
Output:
Shown!
### Enumerable Sections
Enumerable sections are syntactically identical to boolean sections in
that they begin with a pound and end with a slash. The difference,
however, is in the view: if the method called returns an enumerable,
the section is repeated as the enumerable is iterated over.
Each item in the enumerable is expected to be a hash which will then
become the context of the corresponding iteration. In this way we can
construct loops.
Template:
{{#repo}}
<b>{{name}}</b>
{{/repo}}
Hash:
{
"repo": [
{ "name": "resque" },
{ "name": "hub" },
{ "name": "rip" },
]
}
Output:
<b>resque</b>
<b>hub</b>
<b>rip</b>
### Comments
Comments begin with a bang and are ignored. The following template:
<h1>Today{{! ignore me }}.</h1>
Will render as follows:
<h1>Today.</h1>
### Partials
Partials begin with a greater than sign, like `{{> box}}`.
It is useful to think of partials as a "template expansion" - that is,
the actual partial tag will be replaced with the content of the
partial. Therefor partials share the current context.
For example, this template and partial:
base.mustache:
<h2>Names</h2>
{{# names }}
{{> user }}
{{/ names }}
user.mustache:
<strong>{{ name }}</strong>
Can be thought of as a single, expanded template:
<h2>Names</h2>
{{# names }}
<strong>{{ name }}</strong>
{{/ names }}
### Set Delimiter
Set Delimiter tags start with an equal sign and change the tag
delimiters from {{ and }} to custom strings.
Consider the following contrived example:
* {{ default_tags }}
{{=<% %>=}}
* <% erb_style_tags %>
<%={{ }}=%>
* {{ default_tags_again }}
Here we have a list with three items. The first item uses the default
tag style, the second uses erb style as defined by the Set Delimiter
tag, and the third returns to the default style after yet another Set
Delimiter declaration.
According to [ctemplates][ct], this "is useful for languages like TeX, where
double-braces may occur in the text and are awkward to use for
markup."
Custom delimiters may not contain whitespace or the equals sign.
[ct]: http://google-ctemplate.googlecode.com/svn/trunk/doc/howto.html
## COPYRIGHT
Mustache is Copyright (C) 2009 Chris Wanstrath
Original CTemplate by Google
## SEE ALSO
mustache(1), mustache(7), gem(1),
<http://defunkt.github.com/mustache/>