results lookup against .resultset.json is case sensitive (windows)

[ruskotron]

Hi, thanks for a great plugin!

I had an issue where SimpleCov is generating .resultset.json with capital letter for drive ("C:") but coverage.el expects a lower-case value ("c:"). The case of all other characters in the file-path match, and I am able to rectify the situation by lower-casing the letter in the .resultset.json file.

I spent some time trying to patch SimpleCov so that it would generate the filenames in the expected format, but then I realised that the problem wasn't with the generated, or expected typecase, but with the means of comparison.

I modified coverage.el as follows. I don't know if you want to add this directly to your code since it may not be desired on other platforms but I provide here in case others are having similar issue.

I'm not very experienced with lisp, so there may be a neater way to do this, but for now rather than performing a straight associative lookup, it will iterate the keys and perform a case-insensitive comparison returning the first that matches.

Best, Rob

(defun coverage-get-results-for-file (target-path result-path)
  "Return coverage for the file at TARGET-PATH from RESULT-PATH."
  (cl-coerce (cdr
              (car
               (cl-remove-if-not 'identity
                                 (mapcar (lambda (l)

;; === Begin New ===                                           
                                           (seq-find
                                             (lambda (x)
                                               (string-equal
                                                 (downcase target-path)
                                                 (downcase (symbol-name (car x)))))

                                             (cdr (assoc 'coverage l)))
;; === End New ===
;;                                           (assoc-string target-path
;;                                                         (assoc 'coverage l))
                                           )
                                         (coverage-get-json-from-file result-path)))))
             'list))

[trezona-lecomte]

Hi Rob,

Thanks so much for raising the issue and suggesting a solution! I'll take a look at this tonight and get back to you.

Kieran

[trezona-lecomte]

I had a quick look at this, and didn't manage to get a failing test case that reproduces your problem written. I'll continue working on that tomorrow - I want to properly understand the cross-platform implications before merging a solution.

[ruskotron]

Okay well maybe to provide a little bit more context:

• I'm using jruby 1.16.0 as my main ruby interpreter
• Windows 10
• Emacs for Windows
• running under Powershell with Mingw/Msys on the path
• Msys bash set as the shell
• Project is in CVS (😢)
• Working one one of a number of custom gems stored in the project

Also perhaps relevant is I'm running in a custom $HOME so that I can have a custom emacs environment for working on ruby ..

I might suggest that rather than trying to figure out how all this happens it might be more straightforward to detect that the OS is one that uses case-insensitive filenames and go from there!

Hope this helps!