Hey All,
First, where is there some api docs for rubygem related methods and
classes?
Second, I have a gem that bundles some required files for the gem. How
do I find the path of the installed gem, so that I can load the bundled
files. For example, I have one executable file, that needs to load some
files that were included (in the lib) dir. But I do I know what the path
of my gem is?
Thanks all
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Aaron Smith wrote:
Hey All,
First, where is there some api docs for rubygem related methods and
classes?
/usr/lib/ruby/gems/1.8/doc/rubygems-1.3.1/rdoc (Linux - Kubuntu)
Second, I have a gem that bundles some required files for the gem. How
do I find the path of the installed gem, so that I can load the bundled
files. For example, I have one executable file, that needs to load some
files that were included (in the lib) dir. But I do I know what the path
of my gem is?Thanks all
~$ gen env
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Tom Cloyd, MS MA, LMHC - Private practice Psychotherapist
Bellingham, Washington, U.S.A: (360) 920-1226
<< tc@tomcloyd.com >> (email)
<< TomCloyd.com >> (website) << sleightmind.wordpress.com >> (mental health weblog)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hey Tom, Thanks, that information is definitely what I'm looking for.
How would I get that info from within a ruby script. Specifically the
"GEM PATH" is what I would need. Is there a method to get that?
thanks.
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or rather, the "INSTALLATION DIRECTORY."
--
Posted via http://www.ruby-forum.com/.
Aaron Smith wrote:
Hey Tom, Thanks, that information is definitely what I'm looking for. How would I get that info from within a ruby script. Specifically the "GEM PATH" is what I would need. Is there a method to get that?
or rather, the "INSTALLATION DIRECTORY."
===========================
If you had any idea how paltry my knowledge of Ruby really is you would ask me such questions! But...I got us this far, so...
I think I'd try a system call to "gem env", and put the output in a string, then locate "INSTALLATION DIRECTORY:" with StringScanner, and take everything after that, up to the EOL as the path you're after. Easy, actually.
Only I'm momentarily stumped as to how to make the system call AND capture the output. Thomas (Pickaxe 2) says it can be done using backtics. I tried it in irb and got nothing. Still trying to figure it out. It'd be a good trick to know.
t.
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Cloyd, MS MA, LMHC - Private practice Psychotherapist
Bellingham, Washington, U.S.A: (360) 920-1226
<< tc@tomcloyd.com >> (email)
<< TomCloyd.com >> (website) << sleightmind.wordpress.com >> (mental health weblog)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Cloyd wrote:
Aaron Smith wrote:
Hey Tom, Thanks, that information is definitely what I'm looking for. How would I get that info from within a ruby script. Specifically the "GEM PATH" is what I would need. Is there a method to get that?
or rather, the "INSTALLATION DIRECTORY."
===========================
If you had any idea how paltry my knowledge of Ruby really is you would ask me such questions! But...I got us this far, so...
I think I'd try a system call to "gem env", and put the output in a string, then locate "INSTALLATION DIRECTORY:" with StringScanner, and take everything after that, up to the EOL as the path you're after. Easy, actually.
Only I'm momentarily stumped as to how to make the system call AND capture the output. Thomas (Pickaxe 2) says it can be done using backtics. I tried it in irb and got nothing. Still trying to figure it out. It'd be a good trick to know.
t.
Bummer. In order to preserve my reputation, I managed to get irb a bit hung up, so of course it didn't perform `gem env` as I expected. Ungummed, as it were, it works fine. E.g.:
irb(main):001:0> a=`gem env`
=> "RubyGems Environment:\n - RUBYGEMS VERSION: 1.3.1\n - RUBY VERSION: 1.8.7 (2008-08-11 patchlevel 72) [i486-linux]\n - INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.8\n - RUBY EXECUTABLE: /usr/bin/ruby1.8\n - EXECUTABLE DIRECTORY: /usr/bin\n - RUBYGEMS PLATFORMS:\n - ruby\n - x86-linux\n - GEM PATHS:\n - /usr/lib/ruby/gems/1.8\n - /home/tomc/.gem/ruby/1.8\n - GEM CONFIGURATION:\n - :update_sources=> true\n - :verbose => true\n - :benchmark => false\n - :backtrace => false\n - :bulk_threshold => 1000\n - REMOTE SOURCES:\n - RubyGems.org | your community gem host;
irb(main):002:0>
I leave it to you to get the code to have StringScanner find and return the path. Somehow I keep thinking regular expressions might be helpful here, but I dare not there. I think I hear the ice cracking already.
t.
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Cloyd, MS MA, LMHC - Private practice Psychotherapist
Bellingham, Washington, U.S.A: (360) 920-1226
<< tc@tomcloyd.com >> (email)
<< TomCloyd.com >> (website) << sleightmind.wordpress.com >> (mental health weblog)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Cloyd wrote:
Tom Cloyd wrote:
Aaron Smith wrote:
Hey Tom, Thanks, that information is definitely what I'm looking for. How would I get that info from within a ruby script. Specifically the "GEM PATH" is what I would need. Is there a method to get that?
or rather, the "INSTALLATION DIRECTORY."
===========================
If you had any idea how paltry my knowledge of Ruby really is you would ask me such questions! But...I got us this far, so...
I think I'd try a system call to "gem env", and put the output in a string, then locate "INSTALLATION DIRECTORY:" with StringScanner, and take everything after that, up to the EOL as the path you're after. Easy, actually.
Only I'm momentarily stumped as to how to make the system call AND capture the output. Thomas (Pickaxe 2) says it can be done using backtics. I tried it in irb and got nothing. Still trying to figure it out. It'd be a good trick to know.
t.
Bummer. In order to preserve my reputation, I managed to get irb a bit hung up, so of course it didn't perform `gem env` as I expected. Ungummed, as it were, it works fine. E.g.:
irb(main):001:0> a=`gem env`
=> "RubyGems Environment:\n - RUBYGEMS VERSION: 1.3.1\n - RUBY VERSION: 1.8.7 (2008-08-11 patchlevel 72) [i486-linux]\n - INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.8\n - RUBY EXECUTABLE: /usr/bin/ruby1.8\n - EXECUTABLE DIRECTORY: /usr/bin\n - RUBYGEMS PLATFORMS:\n - ruby\n - x86-linux\n - GEM PATHS:\n - /usr/lib/ruby/gems/1.8\n - /home/tomc/.gem/ruby/1.8\n - GEM CONFIGURATION:\n - :update_sources=> true\n - :verbose => true\n - :benchmark => false\n - :backtrace => false\n - :bulk_threshold => 1000\n - REMOTE SOURCES:\n - RubyGems.org | your community gem host;
irb(main):002:0>I leave it to you to get the code to have StringScanner find and return the path. Somehow I keep thinking regular expressions might be helpful here, but I dare not there. I think I hear the ice cracking already.
t.
Also, you might find something useful here:
http://tech.natemurray.com/2007/03/ruby-shell-commands.html
t.
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Cloyd, MS MA, LMHC - Private practice Psychotherapist
Bellingham, Washington, U.S.A: (360) 920-1226
<< tc@tomcloyd.com >> (email)
<< TomCloyd.com >> (website) << sleightmind.wordpress.com >> (mental health weblog)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
there should be something that's part of the rubygem api, so I don't
have to call system commands. I see where you're going with the regex on
the gem env command, but there has to be a better way.
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found it. try this:
$ irb
$ require "rubygems"
$ puts Gem.default_path
-A
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Aaron Smith wrote:
found it. try this:
$ irb
$ require "rubygems"
$ puts Gem.default_path-A
Super - easier. I do get 2 paths, though -
/home/tomc/.gem/ruby/1.8
/usr/lib/ruby/gems/1.8
So you'll still have to locate and extract, but that's nothing (and maybe your install is set up differently...?)
Good luck.
t.
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Cloyd, MS MA, LMHC - Private practice Psychotherapist
Bellingham, Washington, U.S.A: (360) 920-1226
<< tc@tomcloyd.com >> (email)
<< TomCloyd.com >> (website) << sleightmind.wordpress.com >> (mental health weblog)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Cloyd wrote:
Aaron Smith wrote:
found it. try this:
$ irb
$ require "rubygems"
$ puts Gem.default_path-A
Super - easier. I do get 2 paths, though -
/home/tomc/.gem/ruby/1.8
/usr/lib/ruby/gems/1.8So you'll still have to locate and extract, but that's nothing (and
maybe your install is set up differently...?)
Thanks for this thread - exactly what I needed as well. I think code to
find the particular library should try prepending the paths returned
from Gem.default_path in order they are returned, as a gem installed in
a user directory should trump a system gem.
Andy
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