A simple way to express, manage and require your dependencies in Ruby.
Dependencies allows you to declare the list of libraries your application needs with a simple, readable syntax. It comes with a handy command line tool for inspecting and vendoring your dependencies.
Declare your dependencies in a
dependencies file in the root of your project:
rack ~> 1.0 sinatra webrat (test) git://github.com/brynary/webrat.git quietbacktrace ~> 0.1 contest ~> 0.1 (test) haml ~> 2.0 rack-test 0.3 (test) faker ~> 0.3 spawn ~> 0.1 ohm git://github.com/soveran/ohm.git
Now you can try the
dep command line tool to check your dependencies:
$ dep list
You can specify an environment to see if requirements are met:
$ dep list test
The above is
In order to vendor a library you're using, simply:
$ dep vendor haml
If the dependency is expressed with a version number, it will be vendored using
gem unpack. Otherwise, it will try to clone from a Git repository.
It's common to vendor everything when you start a new project. Try this:
$ dep vendor --all
Dependencies doesn't assume you want to use RubyGems, so you're in charge of
requiring it before requiring
dependencies (in Ruby 1.9 you're cornered – there's
no way out).
# init.rb require "rubygems" require "dependencies"
That will work as long as RubyGems is available and you have Dependencies installed.
If a dependency is not found in
./vendor, a call to
#gem will be made.
Another option is to vendor Dependencies itself:
# init.rb require "vendor/dependencies/lib/dependencies"
After that, all your
lib directories below
./vendor will be available in the
Additionally, Dependencies will leave your
./lib in the
- Documentation. It's a text file any team member can read to see what the project depends on.
- Early failure. If a dependency is not met, the program terminates with a polite message inviting you to install the missing dependencies.
- Vendorability (™). Easily vendor everything for self-contained applications.
- Simplicity. It's a very lightweight tool. It won't do everything, but it's simple and works very well for us.
$ sudo gem install dependencies
Copyright (c) 2009 Damian Janowski
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