Security News
Researcher Exposes Zero-Day Clickjacking Vulnerabilities in Major Password Managers
Hacker Demonstrates How Easy It Is To Steal Data From Popular Password Managers
By Jonathan Leitschuh - Aug 19, 2025
wlang
WLang
WLang is a powerful code generation and templating engine, implemented on top o temple and much inspired by the excellent mustache.
Links
Features
- Tunable templating engine. You can define your own tags, and their behavior.
- Powerful logic-less HTML concretization to render web pages à la Mustache with extra.
- Compiled templates for speedy generation.
WLang 3.0 also has a few remaining issues.
- It has some issues with spacing; not a big issue for HTML rendering but might prevent certain generation tasks.
Tunable templating engine
WLang is a templating engine, written in ruby. In that, it is similar to ERB, Mustache and the like:
WLang::Html.render 'Hello to ${who}!', who: 'you & the world'
# => "Hello to you & the world!"
To output HTML pages, WLang does not provides you with killer features or extraordinary shortcus. It supports escaping, as shown above, but many other templating engines do. For such HTML tasks, WLang does a pretty good job but many other engines perform faster and have nicer features. See the examples folder that documents WLang::Html.
WLang is designed to help you for other uses cases, user-defined ones in particular, such as generating code or whatever text generation task for which other engines quickly become inappropriate. WLang helps there because it allows you to create your own dialect, that is, you can define your own tags and their behavior. For instance,
class Highlighter < WLang::Dialect
def highlight(buf, fn)
var_name = render(fn)
var_value = evaluate(var_name)
buf << var_value.to_s.upcase
end
tag '$', :highlight
end
Highlighter.render('Hello ${who}!', who: 'you & the world')
# => "Hello YOU & THE WORLD !"
WLang already provides a few useful dialects, such as WLang::Html (inspired by Mustache but a bit more powerful in my opinion). If they don't match your needs, it is up to you to define you own dialect for making your generation task easy. Have a look at the implementation of WLang's ones, it's pretty simple to get started!
Tilt integration
WLang has built-in support for Tilt facade to templating engines. In order to use that API:
require 'tilt' # needed in your bundle, not a wlang dependency
require 'wlang' # loads Tilt support provided Tilt has already been required
template = Tilt.new("path/to/a/template.wlang") # suppose 'Hello ${who}!'
template.render(:who => "world")
# => Hello world!
template = Tilt.new("path/to/a/template.wlang", :dialect => Highlighter)
template.render(:who => "world")
# => Hello WORLD!
Please note that you should require tilt first, then wlang. Otherwise, you'll have to require wlang/tilt explicitely.
Sinatra integration
WLang comes bundled with built-in support for Sinatra >= 1.4 (release still in progress). As usual in Sinatra, you can simply invoke wlang as follows:
get '/' do
wlang :index, :locals => { ... }
end
As wlang encourages logic-less templates, you should always use locals. However, there is specific support for layouts and partials, as the following example demonstrates:
get '/' do
wlang :index, :locals => {:who => "world"}
end
__END__
@@layout
<html>
>{yield}
</html>
@@index
Hello from a partial: >{partial}
@@partial
yeah, a partial saying hello to '${who}'!
Returned body will be (ignoring carriage returns):
<html>Hello from a partial: yeah, a partial saying hello to 'world'!</html>
FAQs
Unknown package
We found that wlang demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
Package last updated on 07 Jan 2021
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Related posts
Security News
Oxlint Introduces Type-Aware Linting Preview
Oxlint’s new preview brings type-aware linting powered by typescript-go, combining advanced TypeScript rules with native-speed performance.
By Sarah Gooding - Aug 18, 2025
Security News
New Website “Is It Really FOSS?” Tracks Transparency in Open Source Distribution Models
A new site reviews software projects to reveal if they’re truly FOSS, making complex licensing and distribution models easy to understand.
By Sarah Gooding - Aug 15, 2025