Export diff files from git repository.

git-export-diff

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

root = Dir::pwd # get repository fill path without $REPO.
dir  = File.basename(root)

unless File.exists?(File.join(root, ".git"))
  puts "Not a git repository. Bye!"
  exit 1
end

to   = ARGV.first # get last selected rev. newer commit
from = ARGV.last  # get last selected rev. older commit

unless /[a-z0-9]{4,40}/ === to
  puts "Give me valid SHA hash!"
  exit 1
end

format = "zip"
output = "#{root}/../#{dir}-#{to[0,7]}.#{format}"

# set previous rev. to "from" if not selected multiple revision
from = to + "^" if from === to

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

diff_cmd = "git diff --stat --diff-filter=ACRM --name-only #{from}..#{to}"
diff_files = %x[#{diff_cmd}]

puts "¥n"
puts "---- export candidate files ----"
puts diff_files
puts "--------------------------------"
puts "¥n"

if diff_files.empty?
  puts "> There are no export files. Bye!"
  exit 0
end

cmd  = "git archive --format=#{format} --prefix=#{dir}-#{to[0,7]}/ #{to} `#{diff_cmd}` -o #{output}"
puts "cmd    : " + cmd
puts %x[#{cmd}]

exit 0