#!/usr/bin/ruby
#coding: utf-8

out_rd, out_wr = IO.pipe
err_rd, err_wr = IO.pipe

pid = fork

if pid
    out_wr.close
    err_wr.close

    out_eof = false
    err_eof = false

    out_log = ''
    err_log = ''

    loop {
        fds = []
        fds << out_rd unless out_eof
        fds << err_rd unless err_eof

        break if fds.size < 1

        IO.select(fds)

        out = ''
        begin
            out = out_rd.read_nonblock(200)
        rescue Errno::EAGAIN
            ;
        rescue EOFError
            out_eof = true
        end

        err = ''
        begin
            err = err_rd.read_nonblock(200)
        rescue Errno::EAGAIN
            ;
        rescue EOFError
            err_eof = true
        end

        out_log << out
        err_log << err

        out_log = out_log[(out_log.size / 2) .. -1] if out_log.size > 5000
        err_log = err_log[(out_log.size / 2) .. -1] if err_log.size > 5000

        $stdout.write(out)
        $stderr.write(err)
    }

    pid, status = Process.wait2(pid)
    exitcode = status.exited? ? status.exitstatus : 128 + status.termsig

    if exitcode != 0 && ![9, 15].include?(status.termsig)
        unless fork
            text =
                "Команда: #{ARGV.join(' ')}\n" +
                "#{status.inspect}\n"
            text << "\nСообщения об ошибках:\n" + err_log if err_log.size > 0
            text << "\nВывод программы:\n" + out_log if out_log.size > 0
            exec "zenity", "--no-markup", "--error", "--title=Работа программы #{ARGV[0]} была завершена некорректно", "--text=" + text
        end
    end

    exit exitcode

else
    out_rd.close
    err_rd.close
    $stdout.reopen out_wr
    $stderr.reopen err_wr
    exec *ARGV
end