Hi, I have a simple library, one in a pure ruby version and one in a ruby/c version (which is quicker). I would like to distribute both and let the user decide (by checking whether a c library is available) which version to install. What would a clever way to accomplish that? Should I make the decision when running extconf.rb? Any hints? Patrick (the directory structure so far) rb/mylib.rb c/mylib.rb /mylib_base.c /extconf.rb both should be used by require 'mylib' or alike.
on 2006-02-08 21:58
on 2006-02-09 04:13
In article <email@example.com>, Patrick G. <firstname.lastname@example.org> wrote: >(the directory structure so far) > >rb/mylib.rb > >c/mylib.rb > /mylib_base.c > /extconf.rb > >both should be used by require 'mylib' or alike. > How about in your rb/mylib.rb file you do something like: begin require 'ext/mylib_base' rescue require 'lib/mylib_base' end Where ext/mylib_base would be the shared lib created from the C file and lib/mylib_base would be the Ruby implementation. The user of mylib just does: require 'mylib' ....and it's all transparent to the user whether or not the C version or the ruby version is used. Phil
on 2006-02-09 04:15
Well, last guess before I head to bed: In "mylib.rb": begin require "mylib_impl_c" # Attempts to load the C shared library. rescue LoadError require "mylib_impl_rb" # Falls back to the ruby implementation. end Yay for gracefully degrading functionality. Or performance, for that matter. Sprinkle with configuration parameters to let user determine at runtime which backend to use to taste. David V. DÅ?a Streda 08 FebruÃ¡r 2006 20:58 Patrick G. napÃsal:
on 2006-02-09 15:43
Hi Phil (and David), [...] > > The user of mylib just does: > > require 'mylib' > > ...and it's all transparent to the user whether or not the C version or the > ruby version is used. OK, that makes sense. Thanks. I wonder if this could be combined with the setup.rb from RAA (<http://raa.ruby-lang.org/project/setup/3.2.4> When I run ruby setup.rb config setup.rb tries to create the c-extension in ext/mylib/... but this might fail if the user doesn't have the necessary libraries installed. Is there a way in setup.rb to say 'keep going if you can't create the c extension'? I mean as a configuration file or alike, not as a parameter passed to setup.rb. This way the c-extension will installed only if available. Patrick