From: Rolando Abarca Date: 2008-08-30T10:35:44+09:00 Subject: Re: [QUIZ] Where the Required Things Are (#175) On 29-08-2008, at 10:02, Matthew Moss wrote: > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > The three rules of Ruby Quiz 2: > > 1. Please do not post any solutions or spoiler discussion for this > quiz until 48 hours have passed from the time on this message. > > 2. Support Ruby Quiz 2 by submitting ideas as often as you can! (A > permanent, new website is in the works for Ruby Quiz 2. Until then, > please visit the temporary website at > > . > > 3. Enjoy! > > Suggestion: A [QUIZ] in the subject of emails about the problem > helps everyone on Ruby Talk follow the discussion. Please reply to > the original quiz message, if you can. > > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > ## Where the Required Things Are (#175) > > Occasionally, I've taken a look at the source for some Ruby module, > often because there is no manual or man page, or what documentation is > available is outdated or incomplete. Or sometimes I just want to see > how some Ruby stuff is implemented. > > One such example was from the previous quiz: I want to learn more > about the Sys::Uptime module. I have it installed, and the call to > `require 'sys/uptime'` works, but I don't know how to use it. But, > alas, I also don't know where the installed files are located. The > shell command `which` doesn't help here, since the module is unlikely > to be in the shell's executable path. > > What I would like is a script that works like `which` but for Ruby > modules. Examples: > >> ruby modwhich.rb "sys/uptime" > require 'sys/uptime' => > /opt/local/lib/ruby/vendor_ruby/1.8/i686-darwin8.11.1/sys/ > uptime.bundle > >> ruby modwhich.rb date > require 'date' => /opt/local/lib/ruby/1.8/date.rb > > For extra credit, preserve this behavior when modwhich.rb is the main > program, but slightly different behavior is modwhich.rb is required by > another script: > >> ruby -r modwhich upsince.rb > > require 'sys/uptime' => > /opt/local/lib/ruby/vendor_ruby/1.8/i686-darwin8.11.1/sys/ > uptime.bundle > require 'date' => /opt/local/lib/ruby/1.8/date.rb > Last reboot: 2008 Aug 22 at 18:49 > > Note that we allow upsince.rb to run as normal; the output of > modwhich.rb is mixed into stdout. Lots of fun with this quiz :-D so far, I came up with something that does like this: rolando@dev02:~$ ruby quiz175.rb "date" require 'date' => /usr/local/lib/ruby/1.8/date.rb rolando@dev02:~$ ruby quiz175.rb "rubygems" require 'rubygems' => /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb rolando@dev02:~$ ruby quiz175.rb "rubygems" "sequel" require 'rubygems' => /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb require 'sequel' => /usr/local/lib/ruby/gems/1.8/gems/sequel-2.4.0/ lib/sequel.rb rolando@dev02:~$ ruby -r quiz175 test_quiz175.rb require 'date' => /usr/local/lib/ruby/1.8/date.rb require 'rubygems' => /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb require 'sequel' => /usr/local/lib/ruby/gems/1.8/gems/sequel-2.4.0/ lib/sequel.rb require 'sequel_model' => /usr/local/lib/ruby/gems/1.8/gems/ sequel-2.4.0/lib/sequel_model.rb i'm cool piece of ruby code rolando@dev02:~$ cat test_quiz175.rb require 'date' require 'rubygems' #puts "requiring sequel" require 'sequel' require 'sequel_model' puts "i'm cool piece of ruby code" rolando@dev02:~$ REQUIRE_SHOW_ALL=1 ruby quiz175.rb "date" require 'date' => /usr/local/lib/ruby/1.8/date.rb require 'rational' => /usr/local/lib/ruby/1.8/rational.rb require 'date/format' => /usr/local/lib/ruby/1.8/date/format.rb rolando@dev02:~$ REQUIRE_SHOW_ALL=1 ruby quiz175.rb "rubygems" require 'rubygems' => /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb require 'rubygems/rubygems_version' => /usr/local/lib/ruby/ site_ruby/1.8/rubygems/rubygems_version.rb require 'rubygems/defaults' => /usr/local/lib/ruby/site_ruby/1.8/ rubygems/defaults.rb require 'thread' => /usr/local/lib/ruby/1.8/thread.rb require 'thread.so' => /usr/local/lib/ruby/1.8/i686-linux/thread.so require 'rbconfig' => /usr/local/lib/ruby/1.8/i686-linux/rbconfig.rb require 'rubygems/exceptions' => /usr/local/lib/ruby/site_ruby/1.8/ rubygems/exceptions.rb require 'rubygems/version' => /usr/local/lib/ruby/site_ruby/1.8/ rubygems/version.rb require 'rubygems/requirement' => /usr/local/lib/ruby/site_ruby/1.8/ rubygems/requirement.rb require 'rubygems/dependency' => /usr/local/lib/ruby/site_ruby/1.8/ rubygems/dependency.rb require 'rubygems/gem_path_searcher' => /usr/local/lib/ruby/ site_ruby/1.8/rubygems/gem_path_searcher.rb require 'rubygems/source_index' => /usr/local/lib/ruby/site_ruby/ 1.8/rubygems/source_index.rb require 'rubygems/user_interaction' => /usr/local/lib/ruby/ site_ruby/1.8/rubygems/user_interaction.rb require 'rubygems/specification' => /usr/local/lib/ruby/site_ruby/ 1.8/rubygems/specification.rb require 'rubygems/platform' => /usr/local/lib/ruby/site_ruby/1.8/ rubygems/platform.rb require 'rubygems/spec_fetcher' => /usr/local/lib/ruby/site_ruby/ 1.8/rubygems/spec_fetcher.rb require 'zlib' => /usr/local/lib/ruby/1.8/i686-linux/zlib.so require 'rubygems/remote_fetcher' => /usr/local/lib/ruby/site_ruby/ 1.8/rubygems/remote_fetcher.rb require 'net/http' => /usr/local/lib/ruby/1.8/net/http.rb require 'net/protocol' => /usr/local/lib/ruby/1.8/net/protocol.rb require 'socket' => /usr/local/lib/ruby/1.8/i686-linux/socket.so require 'timeout' => /usr/local/lib/ruby/1.8/timeout.rb require 'uri' => /usr/local/lib/ruby/1.8/uri.rb require 'uri/common' => /usr/local/lib/ruby/1.8/uri/common.rb require 'uri/generic' => /usr/local/lib/ruby/1.8/uri/generic.rb require 'uri/ftp' => /usr/local/lib/ruby/1.8/uri/ftp.rb require 'uri/http' => /usr/local/lib/ruby/1.8/uri/http.rb require 'uri/https' => /usr/local/lib/ruby/1.8/uri/https.rb require 'uri/ldap' => /usr/local/lib/ruby/1.8/uri/ldap.rb require 'uri/mailto' => /usr/local/lib/ruby/1.8/uri/mailto.rb require 'stringio' => /usr/local/lib/ruby/1.8/i686-linux/stringio.so require 'rubygems/builder' => /usr/local/lib/ruby/site_ruby/1.8/ rubygems/builder.rb require 'rubygems/custom_require' => /usr/local/lib/ruby/site_ruby/ 1.8/rubygems/custom_require.rb (Matthew: I sent you my answer to the quiz in private, since I'll be away for the next week) > -- > Matthew Moss thanks Matthew for the fun :-D regards, -- Rolando Abarca M.