ruby--ruby/sample/mkproto.rb

$/ = nil
while line = gets()
  if /^((void|VALUE|int|char *\*|ID|struct \w+ *\*|st_table *\*) *)?\n(\w+)\(.*\)\n\s*((.+;\n)*)\{/ =~ line
    line = $'
    printf "%s %s(", $2, $3
    args = []
    for arg in $4.split(/;\n\s*/)
      arg.gsub!(/ +/, ' ')
      if arg =~ /,/
        if arg =~ /(([^*]+) *\** *\w+),/
          type = $2.strip
          args.push $1.strip
          arg = $'
        else
          type = ""
        end
        while arg.sub!(/(\** *\w+)(,|$)/, "") && $~
          args.push type + " " + $1.strip
        end
      else
        args.push arg.strip
      end
    end
    printf "%s);\n", args.join(', ')
    redo
  end
end