gtags-git-update.rb

#!/usr/bin/ruby

# usage : gtags-git-update commit-id

commit = ARGV.shift
git_show = `git show --stat #{commit}`

# match like this " include/linux/memblock.h |"
git_show.scan(/^ (.*\.[ch]) +\|/) { |ary|
  path = ary[0]
  `global -u --single-update #{path}`
}