#!/usr/bin/env ruby

begin
  require "slackware"
rescue
  $stderr.puts "ERROR: please install the slack-utils pkg/gem"
  exit 1
end
require "fileutils"

DEFAULT_PKG_DIR = File.join(Dir.pwd, "pkgs")
DEFAULT_TMP_DIR = "/tmp/pam_hackings"

def collect_new_pkgs(tmp_dir = DEFAULT_TMP_DIR)
  Dir[File.join(tmp_dir, "*.t?z")]
end

def packages_in_dir(dir)
  collect_new_pkgs(dir).map {|file|
    package_from_filename(file)
  }
end

def get_ext(filename)
  filename.reverse.split(".",2)[0].reverse
end

def package_from_filename(file)
  b_name = File.basename(file)
  ext = get_ext(b_name)
  Slackware::Package.parse( b_name.sub(/\.#{ext}$/, "") )
end

if __FILE__ == $0

  abort("ERROR: there is no directory [#{DEFAULT_TMP_DIR}], have you built anything yet?") unless File.directory?(DEFAULT_TMP_DIR)

  collect_new_pkgs().each {|file|
    ext = get_ext(file)
    pkg = package_from_filename(file)

    dest = File.join(DEFAULT_PKG_DIR, pkg.arch)

    if FileTest.file?(File.join(dest,File.basename(file)))
      puts "INFO: #{File.join(dest,File.basename(file))} already exists"
      next
    else
      # first check if there is an older package for this file
      packages_in_dir(dest).each {|p|
        if p.name == pkg.name and p.arch == pkg.arch and (p.version != pkg.version or p.build != pkg.build)
          puts "DELETE: " + File.join(dest, p.fullname + "*")
          FileUtils.rm Dir[File.join(dest, p.fullname + "*")]
        end
      }

      # next copy the file
      puts "COPY: [#{file}] => [#{dest}]"
      FileUtils.copy(file,dest)
    end

  }

  # lastly, regenerate the MD5SUM
  %w{ i486 x86_64 }.each {|arch|
    Dir.chdir(File.join(DEFAULT_PKG_DIR, arch)) do
      sums = `md5sum *.t?z`
      File.open("MD5SUM", "w") {|file|
        file.write(sums)
      }
      puts "#{arch}/MD5SUM written"
    end
  }

end