hook (previouse) for KLayout DRC, put this file under folder bin-release/drc/

drc_hook.rb

# $autorun-early

require 'open3'

# mindon@live.com 2022-04-02
module DRC
  module Hook
    def self.on(drc, macro)
      name = 'KLAYOUT_HOOK_DRC'
      body = macro.text
      line = body[0..((body.index("\n") || 0) - 1)] || ''
      if !line.start_with?('#!HOOK')
        return false
      end
      stop, cmd = true, ''
      i = line.index(' ') || -1
      if i > 0
        cmd = line[0..(i-1)]
        if cmd.end_with?('+')
          stop = false
          cmd = cmd[0..-2]
        end
        j = cmd.index(':') || -1
        if j > 0
          cmd = ENV[name +'_' +cmd[(j+1)..-1]] || ''
          if cmd.length == 0
            raise 'invalid DRC HOOK: ' + line
            return
          end
        else
          cmd = ''
        end
      end
      if cmd.length == 0
        cmd = ENV[name] || ''
      end
      if cmd.start_with?('/') && (not File.file?(cmd))
        raise 'invalid DRC HOOK cmd = ' + cmd
      end
      if cmd.length == 0
        return false
      end

      out, err, status = Open3.capture3(%Q|#{cmd} "#{macro.path}" #{line[(i+1)..-1]}|, :stdin_data=>macro.text)
      if status.success?
        if out.length > 0
          puts out
        end
      else
        raise err || 'DRC HOOK error' 
      end
      return stop
    end
  end
end