#!/usr/bin/env ruby

# This is a command line client that can do a number of read operations
# on a git repository in pure ruby. This may be helpful if you have access
# to a computer that has no C compiler but you want to do some git stuff 
# on it.  It's also helpful for me to test Git stuff with.
# 
# author : Scott Chacon (schacon@gmail.com)
#
# todo:
#   add --git-dir 
#   add --log-file 
#   add --help

#require 'lib/git'
require 'rubygems'
require 'git'
require 'logger'

command = ARGV[0]

if !command
  puts 'You have to provide a command'
  puts 'usage: gitr (command) [args]'
  puts
  puts 'commands: log'
  puts '          log-shas'
  puts '          cat-file'
  puts '          rev-parse'
  puts '          branches'
  puts '          config'
  exit
end

git_dir = ENV['GIT_DIR'] || '.git'
@git = Git.bare(git_dir, :log => Logger.new(STDOUT))

case command
when 'log'
  # gitr log
  @git.log.each do |l|
    puts 'commit ' + l.sha
    puts l.contents
    puts
  end
when 'log-shas'
  # gitr log-shas
  puts @git.log
when 'cat-file'
  # gitr cat-file
  puts @git.cat_file(ARGV[1])
when 'rev-parse'
  # gitr rev-parse
  puts @git.revparse(ARGV[1])  
when 'branches'
  # gitr branches
  puts @git.branches
when 'config'
  # gitr config
  @git.config.sort.each do |k,v|
    puts "#{k} : #{v}"
  end
end

# gitr ls-tree
# gitr pack-browse

# gitr diff / stats ?
# output in yaml?