Platform library dependencies

[thibaudgg]

Listen gem will depend on three main events library:

• rb-fsevent for Mac OS X
• rb-inotify for Linux
• rb-fchange for Windows

Adding specific platform dependencies in a gemspec isn't actually very pleasant (more info) and don't work well with Bundler (rubygems/bundler#635). I'm not sure about FSSM hack (I haven't be able to make it work, and not sure how it will be handle by Bundler) and vendorizing these three gems like Guard is really a pain to maintain.

So there's a proposition. It seems to me that these three gems are installable (even if not usable) on each platforms (tested on OS X and Linux, with JRuby as well) so I propose that Listen always depends on them and only require the needed one (or none of them if polling is used).

I'm aware that isn't an ideal solution, but we can always change it when Bundler issue with specific platform gemspec is fixed.

What do you think about that? Do you have other (better) ideas?

[thibaudgg]

Ok these three gems are also installable on Windows (tested with ruby 1.9.3).

[netzpirat]

Thanks for testing on Windows! So just depending on all gems seems the best solution in terms of user simplicity.

[thibaudgg]

Yeah, I'll implement it this way.

[rymai]

👍

[sunaku]

Great. Could you please update Guard's gem dependencies also? People should automagically get their operating system specific accelerators for Guard::Listener when they install Guard.

[thibaudgg]

When Listen will be ready (hopefully soon!) it'll be used inside Guard (instead of Guard::Listener). I think we can wait until that no?

[sunaku]

Sure, can wait. 🏃