pair

#!/usr/bin/env ruby
# encoding: utf-8

# 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

DOMAIN = 'adorable.io'

AUTHORS = {
  "rh" => "Ryland Herrick",
  "jr" => "Jim Remsik",
  "ka" => "Kevin Altman",
  "mm" => "Mark McEahern"
}

## End of configuration
#######################################################################
HEADER = '🍐  Pair Script'

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

# HANDLE SPECIFIC COMMANDS
if initials.include?('list')
  puts HEADER
  AUTHORS.map do |initial, name|
    puts "   #{initial} => #{name}"
  end
  abort()
end

if initials.include?('help')
  puts HEADER
  puts 'pair            - unset pair'
  puts 'pair <initials> - set any number of pears, separated by spaces'
  puts 'pair list       - list pair users'
  puts 'pair help       - shows this help'
end

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

if authors.any?
  pair_email = "pair+#{initials.sort.join('+')}@#{DOMAIN}"

  git_config_set('user.name', to_sentence(authors))
  git_config_set('user.initials', "#{initials.join('/')}")
  git_config_set('user.email', pair_email)
else
  git_config_unset('user.name')
  git_config_unset('user.initials')
  git_config_unset('user.email')
end