From: badboy <badboy@...>
Date: 2009-04-26T22:12:03+09:00
Subject: Re: Odd Ruby/Rubygems/gem path problem

Pito Salas schrieb:
> Eric Hodel wrote:
>> On Apr 24, 2009, at 17:38, Pito Salas wrote:
>>>> the -r command line option uses rb_require() the C function, not
>>>> Kernel#require the method.  1.9 does not have this limitation.
>>> Eric, thanks. I am not sure of the implication of that. Are you saying
>>> therefore that one cannot rely on -rrubygems -rshoulda to work?
>> With ruby 1.8, no.  There is a workaround though:
>>
>> ruby -rubygems -e 'require "shoulda"; ...'
> 
> Another slight confusion: I've read about -rubygems as well as putting 
> "rubygems" into RUBY_OPT in a document about gems.
> 
> But, in fact if I do a man ruby or a ruby --help there's no mention of 
> the -rubygems option:
> 
> $ruby --h
> Usage: ruby [switches] [--] [programfile] [arguments]
>   -0[octal]       specify record separator (\0, if no argument)
>   -a              autosplit mode with -n or -p (splits $_ into $F)
>   -c              check syntax only
>   -Cdirectory     cd to directory, before executing your script
>   -d              set debugging flags (set $DEBUG to true)
>   -e 'command'    one line of script. Several -e's allowed. Omit 
> [programfile]
>   -Fpattern       split() pattern for autosplit (-a)
>   -i[extension]   edit ARGV files in place (make backup if extension 
> supplied)
>   -Idirectory     specify $LOAD_PATH directory (may be used more than 
> once)
>   -Kkcode         specifies KANJI (Japanese) code-set
>   -l              enable line ending processing
>   -n              assume 'while gets(); ... end' loop around your script
>   -p              assume loop like -n but print line also like sed
>   -rlibrary       require the library, before executing your script
>   -s              enable some switch parsing for switches after script 
> name
>   -S              look for the script using PATH environment variable
>   -T[level]       turn on tainting checks
>   -v              print version number, then turn on verbose mode
>   -w              turn warnings on for your script
>   -W[level]       set warning level; 0=silence, 1=medium, 2=verbose 
> (default)
>   -x[directory]   strip off text before #!ruby line and perhaps cd to 
> directory
>   --copyright     print the copyright
>   --version       print the version
> 
> $ ruby -v
> ruby 1.8.7 (2009-04-08 patchlevel 160) [powerpc-darwin9]
> 
> By the way, my ruby install is via port, in case that matters.
> $ which ruby
> /opt/local/bin/ruby
> 
> 
> At this point I am just confused and curious about what's going on. 
> What's up with that -rubygems switch?
in fact it's just the -r switch with ubygems to load
I have the ubygems.rb in /usr/lib/ruby/site_ruby/1.8/
and the first line says:
 # This file allows for the running of rubygems with a nice
 # command line look-and-feel: ruby -rubygems foo.rb
all code it contains is:
 require 'rubygems'