Browsing Git in Ruby

Jeroen Bulters di 03 aug 10

Recently I’ve been working on a project which involves a lot of interaction with git repositories. When I started hacking around, all interaction with the repository was performed through `shell` commands which – of course – works; but can not really be called idiomatic Ruby.

Luckily I’m not the only one who thinks so. During a presentation by Chris Wanstrath (detailing the stack GitHub uses) I was pointed to Scott Chacon’s GRIT.

Grit is an object oriented wrapper for interacting with any git repository and has only one dependency, git itself (which you have installed… RIGHT?).

Through grit it is possible to walk through a repository in a way we are all quite familiar with. For example, the following snippet gives me all commits made by me during the past 14 days in a repository.

require 'rubygems'
require 'grit'
require 'optparse'

# OptParse code omitted for brevity
# The option hash is supposed to have a committer, branch and days
# (number of days to check) value.
options = {}
options[:committer] = 'Jeroen Bulters'
options[:branch] = 'master'
options[:days] = 14

repo = Grit::Repo.new(Dir.pwd)

# Collect commits

# Ok, I admit, this is rancid, should use rails' fixnum ext.
start_date = (Time.now - (options[:days] * 60 * 60 * 24))

commits = repo.commits.select{|c| c.date > start_date}
filtered_commits = commits.select{|c| c.committer.to_s == options[:committer]}
puts "Found #{filtered_commits.size} commits..."

Although this is a fairly straightforward example, we should not forget that a git repository is a ‘simple’ directed acyclic graph. So get out your favorite graph traversal algorithm and apply it in some
way to your repositories (shortest path between root-commit and master anyone?), it’s easy, it’s fun and it doesn’t hurt!

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