Wrap into a gem

.gitignore

@@ -0,0 +1,3 @@
+.bundle/
+Gemfile.lock
+pkg

Development.md

@@ -0,0 +1,8 @@
+## Releasing a new version
+
+1. To release a new version, update the version number in
+   `git-game.spec` and commit your changes.
+
+2. Run `rake release`. This will create a git tag for the version,
+   push git commits and tags, and push the `.gem` file to
+   [rubygems.org](https://rubygems.org).

Gemfile

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in git-game.gemspec
+gemspec

README.md

@@ -10,11 +10,15 @@ The goal is to get the longest streak! (It's harder than you think...)
 
 ## How do I play?
 
-- [Download the `git-game` executable](https://github.com/jsomers/git-game/releases/tag/1.2)
-- Put it somewhere on your PATH (like /usr/local/bin)
+- `gem install git-game` (or perform [manual installation](#manual-installation)).
 - Then, in any git repository, run `git game`
 - (If you'd like, you can select a subset of commits, for example, `git game --after={2014-08-08}`. For more options, see [http://gitref.org/inspect/](http://gitref.org/inspect/).)
 
+### Manual Installation
+
+- [Download the `git-game` executable](https://github.com/jsomers/git-game/releases/tag/1.2)
+- Put it somewhere on your PATH (like /usr/local/bin)
+
 ## Requirements
 
 - Requires Ruby >1.8

Rakefile

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+require "bundler/gem_tasks"

git-game.gemspec

@@ -0,0 +1,15 @@
+# coding: utf-8
+
+Gem::Specification.new do |spec|
+  spec.name = "git-game"
+  spec.version = 1.1
+  spec.authors = ["jsomers"]
+  spec.summary = %q{The git committer guessing game!}
+  spec.homepage = "https://github.com/jsomers/git-game"
+  spec.license = "MIT"
+
+  spec.executables = 'git-game'
+
+  spec.add_development_dependency "bundler", "~> 1.7"
+  spec.add_development_dependency "rake", "~> 10.0"
+end