From: Robert Dober <robert.dober@...>
Date: 2009-07-20T19:01:34+09:00
Subject: Re: ruby IDE's

On 7/20/09, Tom Cloyd <tomcloyd@comcast.net> wrote:
> Sunil Kumar wrote:
>> Hi This is sunil..
>> i am new to ruby technology...
>> can anyone tel which IDE is good for running ruby programs....
>>
> May I recommend that you learn to run it from the command line. It's not
> at all hard.
>
> I've done several IDE's, and aside from the need to learn them, and
> their bugs, they have the additional disadvantage of keeping you from
> seeing what you're really doing.
Amen (and even more so for beginners)
<snip> the command line, and use the ruby-debug gem (not yet available in ruby
> 1.9
Seems you are running an old version here, I happen to have good news :)

536/49 > cat test1.rb && ruby -vrdebug test1.rb
puts 42
ruby 1.9.1p129 (2009-05-12 revision 23412) [i686-linux]
Debug.rb
Emacs support available.

test1.rb:1:puts 42
(rdb:1) help
Debugger help v.-0.002b
Commands
  b[reak] [file:|class:]<line|method>
  b[reak] [class.]<line|method>
                             set breakpoint to some position
  wat[ch] <expression>       set watchpoint to some expression
  cat[ch] (<exception>|off)  set catchpoint to an exception
  b[reak]                    list breakpoints
  cat[ch]                    show catchpoint
  del[ete][ nnn]             delete some or all breakpoints
  disp[lay] <expression>     add expression into display expression list
  undisp[lay][ nnn]          delete one particular or all display expressions
  c[ont]                     run until program ends or hit breakpoint
  s[tep][ nnn]               step (into methods) one line or till line nnn
  n[ext][ nnn]               go over one line or till line nnn
  w[here]                    display frames
  f[rame]                    alias for where
  l[ist][ (-|nn-mm)]         list program, - lists backwards
                             nn-mm lists given lines
  up[ nn]                    move to higher frame
  down[ nn]                  move to lower frame
  fin[ish]                   return to outer frame
  tr[ace] (on|off)           set trace mode of current thread
  tr[ace] (on|off) all       set trace mode of all threads
  q[uit]                     exit from debugger
  v[ar] g[lobal]             show global variables
  v[ar] l[ocal]              show local variables
  v[ar] i[nstance] <object>  show instance variables of object
  v[ar] c[onst] <object>     show constants of object
  m[ethod] i[nstance] <obj>  show methods of object
  m[ethod] <class|module>    show instance methods of class or module
  th[read] l[ist]            list all threads
  th[read] c[ur[rent]]       show current thread
  th[read] [sw[itch]] <nnn>  switch thread context to nnn
  th[read] stop <nnn>        stop thread nnn
  th[read] resume <nnn>      resume thread nnn
  p expression               evaluate expression and print its value
  h[elp]                     print this help
  <everything else>          evaluate
(rdb:1) quit
Really quit? (y/n) y


and


 cat test1.rb && ruby -vrdebug test1.rb
require 'debug'
 a = 41
@a = 42
ruby 1.9.1p129 (2009-05-12 revision 23412) [i686-linux]
Debug.rb
Emacs support available.

test1.rb:1:require 'debug'
(rdb:1) s
test1.rb:2: a = 41
(rdb:1) v l
  a => nil
(rdb:1) s
test1.rb:3:@a = 42
(rdb:1) v l
  a => 41
(rdb:1) quit
Really quit? (y/n) y

HTH
Robert

-- 
Toutes les grandes personnes ont d’abord été des enfants, mais peu
d’entre elles s’en souviennent.

All adults have been children first, but not many remember.

[Antoine de Saint-Exupéry]