From: Steve Klabnik <steve@...>
Date: 2011-07-19T22:32:20+09:00
Subject: [ruby-core:38192] [Ruby 1.9 - Feature #5054] Compress a sequence of ends


Issue #5054 has been updated by Steve Klabnik.


> I disagree in this case. I don't see much here that could (or should)
> reasonably be flattened: we've got a method with two nested scopes, in a
> class in a namespace module. None of that (except *possibly* the inner
> scope) is unreasonable to my eyes.

I actually agree, in this case. However, this means you might have cascading ends once, at the end of a file. This is infrequent enough that I don't see it as a problem, I guess. Certainly not a problem enough to add syntax to the language, and add syntax that enables other bad programming habits.

I also find this 'feature' to be very visually disruptive. Especially when I see matching ends everywhere else...

I really hope that this doesn't catch on.
----------------------------------------
Feature #5054: Compress a sequence of ends
http://redmine.ruby-lang.org/issues/5054

Author: ANDO Yasushi ANDO
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


Though as matz said at rubykaigi2011 ruby is a quite good language, many people hate a long sequence of `end' like this:

module MyModule
  class MyClass
    def my_method
      10.times do
        if rand < 0.5 
          p :small
        end 
      end 
    end 
  end 
end

So, I'd like to propose introducing a special keyword, en(n+)d. Using this keyword, we can rewrite the above example like this:

module MyModule
  class MyClass
    def my_method
      10.times do
        if rand < 0.5 
          p :small
        ennnnnd 

I know matz's already rejected a python-style block. He wrote:

> it works badly with
>   * tab/space mixture
>   * templates, e.g. eRuby
>   * expression with code chunk, e.g lambdas and blocks
http://www.ruby-forum.com/topic/108457

These bad things won't occur by introducing en(n+)d.

Some implementations already exists.

JRuby
- https://gist.github.com/1088363

CRuby
- http://www.atdot.net/sp/raw/kn9iol
- http://d.hatena.ne.jp/ku-ma-me/20110718/p1

Thanks for your consideration.


-- 
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