cider-eval-defun-at-point doesn't set file and line metadata

[hugoduncan]

When compiling a function in .clj buffer with cider-eval-defun-at-point, the file and line do not get set in the resulting code. This makes it impossible to jump to the location of the function.

[bbatsov]

All interactive evaluations suffer from this. Not sure what we can do about this without an alternative eval middleware.

[bbatsov]

I've opened an issue regarding this upstream http://dev.clojure.org/jira/browse/NREPL-59 //cc @cemerick

Let's see how the discussion will go. I'm not thrilled by the prospect of overriding the default eval, but it might come to this in the end.

[bbatsov]

I've implemented a simple workaround for the time being - if we cannot find a definition via var-info we simply search the open buffers for one having the namespace of the var in question and find its definition in it using a regexp. While it's not bulletproof this works pretty well in practice.