From: "trans (Thomas Sawyer)" <transfire@...>
Date: 2012-03-25T22:20:34+09:00
Subject: [ruby-core:43665] [ruby-trunk - Feature #3346] __DIR__ revisted


Issue #3346 has been updated by trans (Thomas Sawyer).


Well, Ruby does not provide way to get root of app/lib, and current working directory is not always root of applicable app/lib, so that's not always helpful way.

Sometimes practical choice outweighs theoretical ideal. `File.dirname(__FILE__)` is exhaustively used idiom.

Consider another use case:

  myapp/
    lib/
      myapp/
        template.rb
        templates/
          foo.erb
          bar.erb

In `template.rb` there will be something like:

  def read_template(name)
    file = File.dirname(__FILE__) + "/templates/#{name}.rb"
    raise "no such template -- #{name}" unless File.exist?(file)
    File.read(file)
  end


----------------------------------------
Feature #3346: __DIR__ revisted
https://bugs.ruby-lang.org/issues/3346#change-25167

Author: trans (Thomas Sawyer)
Status: Assigned
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: 
Target version: 


=begin
 I'd like to know why __DIR__ was rejected? I use File.dirname(__FILE__) all the time, and I frequently see others do so as well. #relative_require is helpful but it covers only one specific use case --and probably not the most common one. I am often using File.dirname(__FILE__) in build scripts, when I am loading examples for tests, and when I load output templates or other pluggable modules that reside relative to my code. For something so common, having to clutter my code with a 22 character sequence, when an perfectly obvious 7 character sequence would do semms very uncharacteristic of Ruby, which is usually quite concise. Indeed, it is not uncommon to see code that defines a constant such as DIR = File.dirname(__FILE__) when it will be used more than once because it quickly becomes an eye-sore. For these reasons I hope you will reconsider the earlier rejection.
=end



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