From: Helder Ribeiro <helder@...>
Date: 2007-01-24T08:25:06+09:00
Subject: Re: Ruby text editor for beginner

On Jan 22, 11:55 am, James Edward Gray II <j...@grayproductions.net>
wrote:
> On Jan 22, 2007, at 5:48 AM,HelderRibeirowrote:
>
> > Yes, but sometimes you can't chop it up so fine-grained that you have
> > self-contained, one-lined commands (that's what I meant by
> > 'scripting').I think it's harder for some projects than others, but I'm not
> willing to go all the way to "can't".  ;)
>
> > Say you write up a method and want to correct it, you have retype or
> > find through the history by pressing "Up" all the lines that "worked"
> > and re-entering them. You also can't just read them from a file
> > either,
> > AFAIK (not smthg like an incomplete method code, for instance).
>
> > Conversely, it's not trivial to go through the lines that "worked" in
> > that awkward "Up"-key fashion, then select them and save them out to a
> > file.Here are some ideas:
>
>  >> def test
>  >>   puts "This line is OK."
>  >>   puts "So is this one."
>  >>   Object.new.no_such_method  # Oops!
>  >> end
> => nil
>  >> test
> This line is OK.
> So is this one.
> NoMethodError: undefined method `no_such_method' for #<Object:0x102f9ac>
>          from (irb):4:in `test'
>          from (irb):6
>  >> h 6
> [0758] def test
> [0759]   puts "This line is OK."
> [0760]   puts "So is this one."
> [0761]   Object.new.no_such_method  # Oops!
> [0762] end
> [0763] test
> [0764] h 6
> => nil
>  >> get_lines(758..760) << "puts 'Now this is better.'" << "end"
> => ["def test", "  puts "This line is OK."", "  puts "So is this
> one."", "puts 'Now this is better.'", "end"]
>  >> eval((get_lines(758..760) << "puts 'Now this is better.'" <<
> "end").join("\n"))
> => nil
>  >> test
> This line is OK.
> So is this one.
> Now this is better.
> => nil
>
> You can also write to a file:
>
>  >> hw "test_method.rb", 758..760
> => nil
>  >> File.read("test_method.rb")
> => "def test\n  puts "This line is OK."\n  puts "So is this one."\n"
>  >> File.open("test_method.rb", "a") { |f| f << "  puts 'Fixed in the
> file.'\nend\n" }
> => #<File:test_method.rb (closed)>
>  >> File.read("test_method.rb")=> "def test\n  puts "This line is
> OK."\n  puts "So is this one."\n  puts 'Fixed in the file.'\nend\n"
>  >> load "test_method.rb"
> => true
>  >> test
> This line is OK.
> So is this one.
> Fixed in the file.
> => nil
>
> The methods I am using here come from:
>
> http://blog.bleything.net/pages/irb_history
>
> Hope that helps.

Wow, this is awesome! The language is introspective and so is the REPL
=) I'll see how I get along with that.  Thanks a lot!

Helder Ribeiro