pair git commit script

pair.rb

#!/usr/bin/env ruby

# Configures the git author to a list of developers when pair programming
#
# Usage: pair lm bh (Sets the author to 'Luke Melia and Bryan Helmkamp')
#        pair       (Unsets the author so the git global config takes effect)
#
# Author: Bryan Helmkamp (http://brynary.com)
# http://www.brynary.com/2008/9/1/setting-the-git-commit-author-to-pair-programmers-names

#######################################################################
## Configuration

AUTHORS = {
  "ab" => "Alex Baranosky",
  "ak" => "Aninda Kundu",
  "dc" => "David Chelimsky",
  "kt" => "Kasim Tuman",
  "mn" => "Michael Nygard",
  "nid" => "Nivedita Priyadarshini",
  "ph7" => "Philippe Hanrigou",
  "pr" => "Punit Rathore",
  "rn" => "Ryan Neufeld",
  "sd" => "Steven Deobald",
  "ss" => "Steve Sloan",
  "tb" => "Tim Brooks"
}

## End of configuration
#######################################################################

def to_sentence(things)
  if things.size < 3
    things.join(" and ")
  else
    "#{things.first}, #{to_sentence(things.drop(1))}"
  end
end

def git_config_set(name, value)
  `git config "#{name}" "#{value}"`
  puts "#{name} = \"#{value}\""
end

def git_config_unset(name)
  `git config --unset "#{name}"`
  puts "Unset #{name}"
end

unless File.exists?(".git")
  abort "This doesn't look like a git repository."
end

initials = ARGV.map(&:downcase).map(&:strip).reject(&:empty?).uniq

authors = initials.map do |initial|
  AUTHORS[initial] or abort("Couldn't find author name for initials: #{initial}")
end

if authors.any?
  git_config_set('user.name', to_sentence(authors))
  git_config_set('user.initials', initials.join('/'))
else
  git_config_unset('user.name')
  git_config_unset('user.initials')
end