CODEWITHSUNDEEP
ruby
Joe McGuckin
Joe McGuckin

Reputation: 71

irb fails at startup to pause at my code

scripts joe$ irb -rdebug arbo.rb
/Users/joe/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/x86_64-    darwin16/continuation.bundle: warning: callcc is obsolete; use Fiber instead
Debug.rb
Emacs support available.

/Users/joe/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/irb/init.rb:23:    unless @CONF[:PROMPT][@CONF[:PROMPT_MODE]]

   18      IRB.init_error
   19      IRB.parse_opts
   20      IRB.run_config
   21      IRB.load_modules
   22  
=> 23      unless @CONF[:PROMPT][@CONF[:PROMPT_MODE]]
   24        IRB.fail(UndefinedPromptMode, @CONF[:PROMPT_MODE])
   25      end
   26    end
   27

(rdb:1) `

It doesn't pause at the start of my program. It's pausing somewhere inside irb...

Upvotes: 0

Views: 964

Answers (1)

Amadan
Amadan

Reputation: 198294

require "debug" will stop execution after being required, as described here.

Since you're letting irb require it for you (-rdebug), it is stopping execution after the line that requires it: IRB.load_modules.

Also, you should not run your program with irb (or pry), but with ruby: debug will end up fighting irb for your standard input.

If you're using pry, use binding.pry instead of require "debug" (and still invoke your code with ruby, not pry), like this:

require "pry"

def say(word)
  binding.pry
  puts word
end

say "Hello"

(and run with ruby file.rb; or without require "pry", invoke with ruby -rpry file.rb). In the same vein, you could use byebug with byebug instead of binding.pry.

The other part of the text you got shows that debug is written using continuations (for just one feature, restart), and continuations have been marked obsolete. Pry does not use continuations.

Upvotes: 2

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