I have a penchant for setting up all my projects so they work the same.

I like to do these things in all my projects:

• Have all my tests run before committing. I don't like buying ice cream for the team on test failures.
• If I'm developing gems alongside this project, I use a Gemfile.erb to get around the "one gem, one source" issue in current versions of Bundler.
• If I'm moving to different machines or (heaven forbid!) having other developers work on the project, I want to make getting all those local gems as easy as possible.

This gem makes that easier!

What's it do?

Installs a bunch of scripts into the scripts directory of your project:

• gemfile which switches between Gemfile.erb environments
• install-git-hooks which will do just what it says
• hooks, several git hooks that the prior script symlinks into .git/hooks for you
• initialize-environment, which bootstraps your local environment so you can get up and running

Gemfile.erb?!

Yeah, it's a Gemfile with ERB in it:

<% env :local do %>
  gem 'guard', :path => '../guard'
<% end %>

<% env :remote do %>
  gem 'guard', :git => 'git://github.com/johnbintz/guard.git'
<% end %>

<% no_deployment do %>
  gem 'os-specific-things'
<% end %>

Use script/gemfile local to get at the local ones, and script/gemfile remote to get at the remote ones. It then runs bundle install.

You can also run penchant gemfile ENV.

Deployment mode

Use no_deployment blocks to indicate gems that shouldn't even appear in Gemfiles destined for remote servers. Very helpful when you have OS-specific gems and are developing on one platform and deploying on another, or if you don't want to deal with the dependencies for your testing frameworks:

<% no_deployment do %>
  require 'rbconfig'
  case RbConfig::CONFIG['host_os']
  when /darwin/
    gem 'growl_notify'
    gem 'growl'
    gem 'rb-fsevent'
  when /linux/
    gem 'libnotify', :require => nil
  end

  group :test do
    # ... all your testing libraries you won't need on the deployed end ...
  end
<% end %>

Run penchant gemfile ENV --deployment to get this behavior. This is run by default when the pre-commit git hook runs, but only after the default Rake task passes.

initialize-environment

Get new developers up to speed fast! script/initialize-environment does the following when run:

• Check out any remote repos found in Gemfile.erb to the same directory where your current project lives. That way, you can have your Gemfile.erb set up as above and everything works cleanly.
• Runs script/gemfile remote to set your project to using remote repositories.
• Runs rake bootstrap for the project if it exists.

After-gemfile hooks?

Drop a file called .penchant in your project directory. It'll get executed every time you switch environments using Penchant. I use it to tell my Hydra clients to sync and update their Gemfiles, too:

# rake knows if you need "bundle exec" or not.

rake "hydra:sync hydra:remote:bundle"

What environment are you currently using in that Gemfile?

head -n 1 that puppy, or penchant gemfile-env.

git hook?!

It runs penchant gemfile remote then runs bundle exec rake. Make sure your default Rake task for the project runs your tests and performs any other magic necessary before each commit. Your re-environmented Gemfile and Gemfile.lock will be added to your commit if they've changed.

Skipping all that Rake falderal?

Do it Travis CI style: stick [ci skip] in your commit message. That's why the meat of hte git hooks resides in commit-msg and not pre-commit: you need the commit message before you can determine if the tests should be run based on the commit message. Weird, I know.

How?!

• gem install penchant
• cd to your project directory

And then one of the following:

• penchant install for a new project (--dir=WHEREVER will install the scripts to a directory other than $PWD/scripts)
• penchant update to update the installation (--dir=WHEVEVER works here, too)
• penchant convert for an existing project (--dir=WHEVEVER works here, too)