From: zdennis <zdennis@...>
Date: 2006-04-08T01:29:52+09:00
Subject: Re: autorequire.rb

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Depending on how smart you want it to be it will fail on stdlib's that don't follow a consistent downcase/spelling naming
convention, ie: ostruct => OpenStruct

It doesn't work with files which don't have a toplevel file to include, like 'net/ssh'. There is no 'net' file to load like there
is with 'cgi' in 'cgi/session'. Although I can't think of a way OTOH to get around this with const_missing, since you'll never see
the SSH part of Net::SSH because it will fail on Net.

Zach


ara.t.howard@noaa.gov wrote:
> 
> 
> just hacked this out - can anyone see holes in it?
> 
> 
>     harp:~ > cat autorequire.rb
>     class Module
>       alias_method "const_missing!", "const_missing"
>       def const_missing c
>         lib4 = lambda{|k| k.to_s.downcase.gsub(%r/::/, File::SEPARATOR)}
>         lib = Object == self ? lib4[c] : lib4["#{ name }::#{ c }"]
>         begin; require lib; rescue LoadError; end
>         const_missing! c unless const_defined? c
>         const_get c
>       end
>     end
> 
>     if $0 == __FILE__
>       p Object
>       p CGI
>       p CGI::Session
>       p PStore
>       p K
>     end
> 
> 
> 
>     harp:~ > ruby autorequire.rb
>     Object
>     CGI
>     CGI::Session
>     PStore
>     autorequire.rb:7:in `const_missing': uninitialized constant K
> (NameError)
>             from autorequire.rb:17
> 
> 
> regards.
> 
> 
> -a

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