Module: J1::Utils::Exec2

Extended by:
Exec2
Included in:
Exec2
Defined in:
lib/j1/utils/exec2.rb

Instance Method Summary collapse

Instance Method Details

#run(title, *args) ⇒ Object

Runs a program in a sub-shell and return a Process::Status on exit

title - prepend a title on all messages *args - a list of strings containing the program name and arguments



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# File 'lib/j1/utils/exec2.rb', line 13

def run(title, *args)
  Open3.popen3(*args) do |stdin, stdout, stderr, status|

    # manage software interrupt on Ctrl-C
    trap('INT') {
      timestamp = Time.now.strftime("%Y-%m-%d %H:%M:%S")
      puts "#{timestamp} - #{title}: Received Ctrl-C to stop"
      [stdin, stdout, stderr].each(&:close)
      raise SystemExit
    }

    # manage messages on stdout
    stdout_thr = Thread.new do
      # exit the tread silently
      Thread.current.report_on_exception = false
      stdout.each_line do |line|
        timestamp = Time.now.strftime("%Y-%m-%d %H:%M:%S")
        puts "#{timestamp} - #{title}: #{line}"
      end
    end

    # manage messages on stdout
    stderr_thr = Thread.new do
      # exit the tread silently
      Thread.current.report_on_exception = false
      stderr.each_line do |line|
        timestamp = Time.now.strftime("%Y-%m-%d %H:%M:%S")
        puts "#{timestamp} - " + "\e[31m" + "#{title}: #{line}" + "\e[0m"
      end
    end

    # combine channels stdout, stderr for output
    [stdout_thr, stderr_thr].each(&:join)

    # close channels explicitly to exit gracefully
    [stdin, stdout, stderr].each(&:close)

    # exit and return Process::Status
    status.value
  end
end