Detect changes in namespaces split over several files

[hutch]

Addresses open issues #1, #7, #8, and #9

• will now re-load namespaces if a source file that is explicitly loaded changes.
  This will only work if the first non-comment form of the 'helper' or
  'extension' source file is an (in-ns) form. It will not look for any
  subsequent in-ns forms in the file. This is the same idiomatic usage of
  load/in-ns that is found in clojure/core.
  • newer-namespace-decls returns a list of ns-decls (as before) but also
    a set of namespace names (symbols) that have been affected.
• avoid calling .fileModifed twice for each source file
• replace contains? (as in
  https://github.com/ahjones/ns-tracker/commit/164822959e47c2d8d2540aa063140f2a9609bfbc)
• use tools.namespace 0.2.2 (similarly to
  jakemcc@6884b4c)
• use clojure 1.3.0 (required by tools.namespace)

[hutch]

I just noticed that I didn't remove a println -- line 130 of core.clj.

[weavejester]

I'd be avoiding the upgrade to Clojure 1.3.0 because I wanted to retain support for older versions of Clojure in Ring for as long as possible. However, I suspect that I'll need to bite the bullet and upgrade.

[hutch]

I wasn't aware you were trying to avoid the upgrade. There's very little of clojure.tools.namespace actually used, three methods, two of which are trivial. I would think it's possible to avoid the upgrade with some small changes to what I did.

[hutch]

Though with 1.5 imminent you have to wonder how far back you're prepared to support.

[weavejester]

Given that 1.5 is probably going to be out at the same time as Ring 1.2, maybe it's reasonable to have a policy of supporting Clojure 2 versions back.

[hutch]

That sounds perfectly reasonable to me.