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#!/usr/bin/env ruby
#
#= Export diff files between 2 revisions.
#
# export only commited files for SourceTree.
#
#== setup
#
# set this script to cunstom action.
# then, set "$REPO $SHA" in parameters.
#
#== usage
#
# select one or more revisions and execute custom action.
# then, create archive to parent directory of PROJECT_ROOT.
# this archive contains files commited in selected revisions.
#

root = ARGV.shift
dir  = File.basename(root)
from = ARGV.first
to   = ARGV.last

format = "zip"
output = "#{root}/../#{dir}.#{format}"

# if not selected multiple revision
# TODO: tell me more better way.
if from === to
  to = %x[git log --pretty=oneline | cut -d' ' -f1 | grep -A1 #{from} | tail -1]
  to = to.strip
end

puts "root  :" + "#{root}"
puts "dir   :" + "#{dir}"
puts "from  :" + "#{from}"
puts "to    :" + "#{to}"
puts "format:" + "#{format}"
puts "output:" + "#{output}"

diff = "git diff --name-only #{to} #{from}"
cmd  = "git archive --format=#{format} --prefix=#{dir}2/ #{from} `#{diff}` -o #{output}"

puts "cmd :" + cmd
%x[#{cmd}]