From: Pito Salas <rps@...>
Date: 2009-04-26T22:09:41+09:00
Subject: Re: Odd Ruby/Rubygems/gem path problem

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?
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