Template engine built on top of the Oli language


Note that oml is still a just-for-fun beta project

oml (oli markup language) is a tiny template engine built on top of the Oli language which runs in node and the browser. It's powered by oli.js and htgen

You can try it online here

url = ''
    include: includes/head
    &title: This is oml!
      if (foo) { 
        bar(2 ^ 2)
    # use a reference that points to 'title' 
    h1.head: *title 
    # use the shortcuts for class and id attributes definition 
    .container@main (title: 'Main container'):
        | A template engine built on top of the Oli language
      a (href: *url): Oml reference
        Lorem ipsum ad his scripta blandit partiendo, 
        eum fastidii accumsan euripidis in, eum liber 
        hendrerit an. Qui ut wisi vocibus suscipiantur

Take a look to the syntax reference for more details and supported features

  • Elegant, simple and minimalist syntax
  • Built-in support for mixins and file includes
  • Tag definition shortcuts and attributes autocompletion
  • Built-in support for data references
  • Generates pretty well-indended code
  • Runs over node and browsers
  • Self-contained, no third party dependencies (in browser environments)
  • Based in the Oli language (so you can use all of the native language features)
  • Include/require support in the browser
  • Layout blocks (Jade-like)
  • HTML entities decoding
$ npm install omljs

For CLI usage only, it's recommented you install it as global package

$ npm install -g omljs
$ bower install oml --save

Or load the script remotely (just for testing or development)

<script src="//"></script>

Then you can create script tags with text/oli MIME type

<script type="text/oli" src="path/to/template.oli"></script>

It will automatically fetch and parse the oli sources and make it available from oli.scripts. To disable the automatic parsing, just add data-ignore attribute in the script tag

  • Node.js >= 0.8.0
  • Chrome
  • Firefox
  • Safari 5
  • Opera >= 11.6
  • IE >= 9
  Usage: oml [options] <path/to/file.oli>
    -h, --help           output usage information
    -V, --version        output the version number
    -o, --output <file>  write output into a file instead of stdout
    -i, --in-line        parse in-line argument as string
    -p, --pretty         generate well-indented pretty output
    -d, --indent <size>  JSON output indent size. Default to 2
    -t, --tabs           use tabs instead of spaces to indent
    -s, --stdin          read source from stdin
  Usage examples:
    $ oml file.oli > file.html
    $ oml file.oli -o file.html
    $ oml -i "div: p: Hello"
    $ oml -s < file.oli
    $ oml --indent 4 file.oli
    $ oml --tabs file.oli
var oml = require('omljs')
var code = 'h1.title: Hello oml!'
try {
  oml.render(code, { pretty: true })
} catch (e) {
  console.error('Cannot render:', e.message)

Parse, compile and render the given. It will throw an exception if a parsing, compilation or rendering error happens

Expose the template engine constructor

Expose the oli.js API

Expose the htgen API

Render supported options:

  • locals: Local context to pass to the compiler. Default to null
  • basePath: Base path to use for includes. Default to the current working directory
  • pretty: Generate a well-indented code. Default to false
  • size: Initial indent size. Default to 0
  • indent: Indent spaces. Default to 2
  • tabs: Use tabs instead of spaces to indent. Default to false

This reference only points to the specific syntax use cases related to oml

Please, take into account that oml syntax is completely based on the Oli language, so you can use any feature that is natively supported by Oli, like data references or block inheritance

For more information about the oli syntax, you could visit the language site or read the specification

The document can use any of the following doctypes alias:

html => <!DOCTYPE html>
xml => <?xml version="1.0" encoding="utf-8" ?>
transitional => <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
strict => <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "">
frameset => <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "">
1.1 => <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "">
basic => <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN" "">
mobile => <!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.2//EN" "">


doctype html # => <!DOCTYPE html> 
p: this is a text # => <p>this is a text</p>
  li: Apple
  li: Banana
  li: Coco

Self-closed tags

img! # => <img/> 
img(src: 'image.png') # => <img src="image.png"/> 
a.button # => <a class="button"></a>
.content # => <div class="content"></div>
a@link # => <a id="link"></a>
@content # => <div id="content"></div>
(href:''): Google 
# => <a href=""></a> 
(class: 'link', href: ''): Oli 
# => <a class="link" href="">Oli</a> 


    This will be parsed 
    as a raw text


    This will be parsed 
    as a raw text

You also can use interpolated HTML tags

  p:- This is a plain <strong>text</strong>

Using pipe block expression

  | p: This is a plain <strong>text</strong>

Plain text

script (type: text/javascript):>
  if (foo) { 
     bar(1 + 5)

Load and include content from a file in the document

include: path/to/file.oli

require is like include, the unique significant difference between both are that require load and render the file in an isolated sandbox context, so that means you cannot share variables or mixins between documents

require: path/to/file.oli

Mixin declaration

mixin title:
  h1: Hello Oml

Passing arguments:

mixin sample(title, text):
  h1: Hello $name
  p: $text
+sample ('oml', 'This is a paragraph')

Default arguments:

mixin sample(title, text: 'default value'):
  h1: Hello $name
  p: $text
+sample ('oml')

Line comments

# this is 
# a comment 

Block comments

  This is a block comment

Wanna help? Cool! It will be really apreciated :)

You must add new test cases for any new feature or refactor you do, always following the same design/code patterns that already exist

oml is completely written in LiveScript language. Take a look to the language documentation if you are new with it. You should follow the LiveScript language conventions defined in the coding style guide

Only node.js and Grunt are required for development

Clone/fork this repository

$ git clone && cd oml

Install package dependencies

$ npm install

Run tests

$ npm test

Coding zen mode

$ grunt zen [--force]

Bundle browser sources

$ grunt build

Release a new patch version

$ grunt release

Copyright (c) Tomas Aparicio

Released under the MIT license