[Rock-dev] improving error messages in ruby

[Sylvain Joyeux]

You could do it manually in each case. For instance, in vizkit.rb, you 
manually do

begin
   require 'TypelibQtAdapter'
rescue LoadError
   # display message and exit 1
end

I don't really think that creating a new rock_require makes sense in 
this case. In essence, you will have up to one such require block per 
library, and this is part of the library, not part of the user scripts.

Thoughts ?

> I don't really see a nice way to detect thinks like this without having
> side effects.
>
> Declaring packages which are always being built even if someone calls
> "build ." might be a better solution.
This is often impractical, as sometimes people want to add "example" 
scripts in their packages that depend on other stuff to be there, but 
without forcing these dependencies.
-- 
Sylvain Joyeux (Dr.Ing.)
Space & Security Robotics

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