#!/usr/bin/env ruby

require "fileutils"

require "tmpdir"

vcs, repo_path, *rest = ARGV

case vcs

when "git"

branches = rest.each_slice(3).map do |_oldrev, _newrev, refname|

IO.popen(["git", "rev-parse", "--symbolic", "--abbrev-ref", refname], &:read).strip

end.uniq

else

raise "unknown vcs: #{vcs.inspect}"

end

branches.each do |branch|

Dir.mktmpdir do |work|

v = File.join(work, "v")

version_h = "#{v}/version.h"

version_h_orig = version_h + "~"

system "git clone --depth=1 --branch=#{branch} file:///#{repo_path} #{v}"

formats = {

'DATE' => [/"\d{4}-\d\d-\d\d"/, '"%Y-%m-%d"'],

'TIME' => [/".+"/, '"%H:%M:%S"'],

'CODE' => [/\d+/, '%Y%m%d'],

'YEAR' => [/\d+/, '%Y'],

'MONTH' => [/\d+/, '%-m'],

'DAY' => [/\d+/, '%-d']

}

now = Time.now

unless File.exist?(version_h) # refs/notes/commits does not have version.h

puts "skipped '#{branch}' because '#{version_h}' is missing."

next

end

File.rename version_h, version_h_orig

open(version_h_orig) do |fold|

open(version_h, "w") do |fnew|

while line = fold.gets

if /RUBY_RELEASE_(#{formats.keys.join('|')})/o =~ line

format = formats[$1]

line.sub!(format[0]) do

now.strftime(format[1])

end

end

fnew.puts line.rstrip

end

end

end

Dir.chdir(v) do

unless system("git diff --quiet --exit-code #{version_h}")

system "git add #{version_h} && git commit -m '#{now.strftime %(* %Y-%m-%d)} [ci skip]' && git push origin #{branch}"

end

end

end

end