Finding the location of libraries

ruby-talk
1

Greetings fellow rubyists!
I am looking for a way of checking which location a library I use is
at. Let me demonstrate with an example:

Let's assume that I have a hypotetical programa program, foo.rb . That
program requires a library, as in
   require 'bar'

The problem is, I have 4 different versions of bar.rb and one bar.so,
and would like to know which one I am using. How would I go around
figuring this out?

Cheers!

  -C.W.S.

2

Claus Spitzer wrote:

Greetings fellow rubyists! I am looking for a way of checking which location a library I use is
at. Let me demonstrate with an example:

Let's assume that I have a hypotetical programa program, foo.rb . That
program requires a library, as in
   require 'bar'

The problem is, I have 4 different versions of bar.rb and one bar.so,
and would like to know which one I am using. How would I go around
figuring this out?

If you know what you are looking for you can search the $: global variable which houses the paths that ruby looks in for files.

require "time"
$:.each do |path|
    puts "#{path}/time.rb" if File.exist?( "#{path}/time.rb" )
end

here i cheated because I knew I was looking for time. A better solution is:

def require( what )
    super
    $:.each do |path|
       puts "#{path}/#{what}.rb" if File.exist?( "#{path}/time.rb" )
    end
end

require "time"

but this will give you output for every required file. Example when I required "time" I get the following output:

---------- Capture Output ----------
> "c:\ruby\bin\ruby.exe" loadtest.rb -d
c:/ruby/lib/ruby/1.8/rational.rb
c:/ruby/lib/ruby/1.8/date/format.rb
c:/ruby/lib/ruby/1.8/parsedate.rb
c:/ruby/lib/ruby/1.8/time.rb

HTH,

Zach

3

"Claus Spitzer" <docboobenstein@gmail.com> schrieb im Newsbeitrag
news:bb13341905020109007036e0d3@mail.gmail.com...

Greetings fellow rubyists!
I am looking for a way of checking which location a library I use is
at. Let me demonstrate with an example:

Let's assume that I have a hypotetical programa program, foo.rb . That
program requires a library, as in
   require 'bar'

The problem is, I have 4 different versions of bar.rb and one bar.so,
and would like to know which one I am using. How would I go around
figuring this out?

ruby -e '$LOAD_PATH.each {|dir| p Dir[File.join(dir,"bar.*")]}'
ruby -e 'puts $LOAD_PATH.select {|dir| !
Dir[File.join(dir,"bar.*")].empty?}'

Kind regards

    robert

4

I had a typo in my last post, the second code fragment should be:

def require( what )
    super
    $:.each do |path|
       puts "#{path}/#{what}.rb" if File.exist?( "#{path}/#{what}.rb" )
    end
end

require "time"

HTH,
Zach

5

Awesome! Thanks to both you and Zach.

···

On Wed, 2 Feb 2005 02:20:48 +0900, Robert Klemme <bob.news@gmx.net> wrote:

"Claus Spitzer" <docboobenstein@gmail.com> schrieb im Newsbeitrag
news:bb13341905020109007036e0d3@mail.gmail.com...
> Greetings fellow rubyists!
> I am looking for a way of checking which location a library I use is
> at. Let me demonstrate with an example:
>
> Let's assume that I have a hypotetical programa program, foo.rb . That
> program requires a library, as in
> require 'bar'
>
> The problem is, I have 4 different versions of bar.rb and one bar.so,
> and would like to know which one I am using. How would I go around
> figuring this out?

ruby -e '$LOAD_PATH.each {|dir| p Dir[File.join(dir,"bar.*")]}'
ruby -e 'puts $LOAD_PATH.select {|dir| !
Dir[File.join(dir,"bar.*")].empty?}'

Kind regards

    robert