From: Dale Martenson <dale.martenson@...>
Date: 2006-06-22T06:18:43+09:00
Subject: Re: How to do this debugging?

Philip Rhoades wrote:
> Dale,
> 
> Something odd here - see below . .
> 
> 
> On Tue, 2006-06-20 at 23:54 +0900, Dale Martenson wrote:
>> >> 
>> > Debug.rb
>> > .
>> > require 'ftools'  (line 6)
>> you could share the source. Or could you reduce the program down to a 
>> prefix. The input is just the program source itself.
>> puts "BUBBA END."
>> 
>> /usr/lib/ruby/1.8/ftools.rb:15:  def syscopy from, to
>> (rdb:1) s
>> /usr/lib/ruby/1.8/ftools.rb:150:  alias o_chmod chmod
>> d.rb:5:$stdin.each_line do |line|
>> d.rb:6: puts "BUBBA: "+line
>> BUBBA: end
>> You should attempt to step through your program to see what happens. You 
>> may want to turn on trace.
> 
> 
> [root@prix bin]# ruby -r debug debugtst.rb
> Debug.rb
> Emacs support available.
> 
> debugtst.rb:3:require 'ftools'
> (rdb:1) $stdin = IO.popen( "cat debugtst.rb" )
> #<IO:0xb7f676c8>
> (rdb:1) #!/usr/bin/env ruby
> nil
> (rdb:1)
> #!/usr/bin/env ruby
> nil
> (rdb:1) require 'ftools'
> true
> (rdb:1)
> require 'ftools'
> false
> (rdb:1) $stdin.each_line do |line|
> debugtst.rb:3:compile error
> debugtst.rb:3: syntax error, unexpected $end
> $stdin.each_line do |line|
>                           ^
> (rdb:1)         puts "BUBBA: "+line
> debugtst.rb:3:undefined local variable or method `line' for main:Object
> (rdb:1) end
> debugtst.rb:3:compile error
> debugtst.rb:3: syntax error, unexpected kEND
> (rdb:1) puts "BUBBA END."
> BUBBA END.
> nil
> (rdb:1)
> puts "BUBBA END."
> BUBBA END.
> nil
> (rdb:1)
> puts "BUBBA END."
> BUBBA END.
> nil
> (rdb:1)
> puts "BUBBA END."
> BUBBA END.
> nil
> (rdb:1)
> 
> 
> I don't get the chance to step . . it looks like something peculiar to
> my system (FC5 + latest Ruby) . . any idea what?
> 

What version of ruby are you using? I happened to be using 1.8.2 (not 
the latest and greatest, but darn good none the less). It is like it is 
not letting you redefine $stdin. Once you do, it takes the input to the 
debugger from the piped input which is not what you want. Is this a 
difference between using readline or not for IRB. I don't think so and I 
would assume you are using readline for IRB.  I also tried it on an 
older machine of mine that is running a 1.8.1 version of Ruby that 
doesn't have readline and it worked as I would expect.

Weird?

--Dale

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