Method: Bio::Command.query_command_open3

Defined in:
lib/bio/command.rb

.query_command_open3(cmd, query = nil) ⇒ Object

Executes the program via Open3.popen3 with the query (String) given to the stain, waits the program termination, and returns the data from stdout and stderr as an array of the strings.

You would use this method only when you really need to get stderr.

Arguments:

  • (required) cmd: Array containing String objects

  • (optional) query: String

Returns

Array containing 2 objects: output string (or nil) and stderr string (or nil)



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# File 'lib/bio/command.rb', line 323

def query_command_open3(cmd, query = nil)
  errorlog = nil
  cmd = safe_command_line_array(cmd)
  Open3.popen3(*cmd) do |pin, pout, perr|
    perr.sync = true
    t = Thread.start { errorlog = perr.read }
    begin
      pin.print query if query
      pin.close
      output = pout.read
    ensure
      t.join
    end
    [ output, errorlog ]
  end
end