RCR 309: __DIR_

Problem

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At the very least:

  irb(main):001:0> __DIR__ = File.dirname(__FILE__)
  => "."
  irb(main):002:0> def x
  irb(main):003:1>   p __DIR__
  irb(main):004:1> end
  => nil
  irb(main):005:0> x
  NameError: undefined local variable or method `__DIR__' for main:Object
        from (irb):3:in `x'
        from (irb):5

But again built-in would be even better.

Implementation

__DIR__ = File.dirname(__FILE__)

Comments

Current voting

Hi --

You could define it as a method:

  module Kernel
    def __DIR__
      File.dirname(__FILE__)
    end
  end

David Black

Ah, Kernel method. Of course. Thanks. Had constant stuck in my mind for some reason.

I should point out for those who don;t see it right off, that this is still a viable addition despite it being definable as a kernel method. Notice that the kernel method will always return the directory location of the file it is defined in, not the one you call it from. So it doesn't really work.

module Kernel

  def __DIR__
    (/^(.+)?:\d+/ =~ caller[0]) ? File.dirname($1) : nil
  end

end

Hey, thanks! That went right into Facets. If you would like I can credit you in the source code, whomever you are?

T. (Trans)

Strongly opposed	1
Opposed	1
Neutral	0
In favor	1
Strongly advocate	2

RCR 309: DIR

Abstract

Problem

Proposal

Analysis

Implementation

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RCR 309: __DIR__

Abstract

Problem

Proposal

Analysis

Implementation

RCR 309: DIR