Readline.readline - Hitting enter key?

ruby-talk
1

Hi. Perhaps anyone can help me.

Here the ruby test script for me ( If you don't want to copy paste,
here is a link to it on github https://gist.github.com/1345574 and
pastie http://pastie.org/2826323 ).

require 'pp'
require 'readline'

T = true
F = false

@use_readline = T

alias e puts

def show_welcome_message
  e 'Hi! Please input something now.'
end
def get_user_input
  begin
    if @use_readline # Use readline.
      @user_input = Readline.readline('',true)
    else # Or use gets instead.
      @user_input = gets.chomp
    end
  rescue Interrupt => error
    e 'KeyInterrupt -> BYE!'
    exit_program
  end
end
def exit_program; exit 1; end # Exit here.
def check_against_menu
  _ = @user_input
  case _
  when 'q'
    exit_program
  else
    e 'Not found input `'+_+'`.'
  end
end

show_welcome_message
loop {
  get_user_input
  check_against_menu
}

···

---------------------------------------------

If I use gets() and then hit Ctrl-C, the script will
interrupt immediately.

If I use readline though (by changing the variable
@use_readline from T to F, true to false) and then
hit Ctrl-C, I need to hit the ENTER key before I get
the exception.

Does anyone know why? Can anyone reproduce this?

I use Linux, Knoppix hdinstall (Debian), bash shell
in KDE4 konsole and ruby 1.8.7 (2011-02-18
patchlevel 334) [i686-linux]

--
Posted via http://www.ruby-forum.com/.

2

I can't reproduce this. Readline works the same way as gets on my desktop. (redhat)

$ uname -a
Linux 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:54 EDT 2009 i686 i686 i386 GNU/Linux
$ ruby -v
ruby 1.9.2p180 (2011-02-18 revision 30909) [i686-linux]

Best,
Jingjing

···

-----Original Message-----
From: Marc Heiler [mailto:shevegen@linuxmail.org]
Sent: Monday, November 07, 2011 9:25 AM
To: ruby-talk ML
Subject: Readline.readline - Hitting enter key?

Hi. Perhaps anyone can help me.

Here the ruby test script for me ( If you don't want to copy paste,
here is a link to it on github https://gist.github.com/1345574 and
pastie http://pastie.org/2826323 ).

require 'pp'
require 'readline'

T = true
F = false

@use_readline = T

alias e puts

def show_welcome_message
  e 'Hi! Please input something now.'
end
def get_user_input
  begin
    if @use_readline # Use readline.
      @user_input = Readline.readline('',true)
    else # Or use gets instead.
      @user_input = gets.chomp
    end
  rescue Interrupt => error
    e 'KeyInterrupt -> BYE!'
    exit_program
  end
end
def exit_program; exit 1; end # Exit here.
def check_against_menu
  _ = @user_input
  case _
  when 'q'
    exit_program
  else
    e 'Not found input `'+_+'`.'
  end
end

show_welcome_message
loop {
  get_user_input
  check_against_menu
}

---------------------------------------------

If I use gets() and then hit Ctrl-C, the script will
interrupt immediately.

If I use readline though (by changing the variable
@use_readline from T to F, true to false) and then
hit Ctrl-C, I need to hit the ENTER key before I get
the exception.

Does anyone know why? Can anyone reproduce this?

I use Linux, Knoppix hdinstall (Debian), bash shell
in KDE4 konsole and ruby 1.8.7 (2011-02-18
patchlevel 334) [i686-linux]

--
Posted via http://www.ruby-forum.com/.