Very close. Note that find has -prune option that would help a lot because it can stop find from entering unwanted directories and doing a lot of useless work:

find . 
    -type d \( bad_directories \) -prune
    -o
    -type f \\( -name '*.hs' -or -name '*.lhs' -or -name '*.hsc' \\) -not \\( -name '#*' -or -name '.*' \\)
    -print0

Please change to using -prune. For more inspiration rgrep elisp function has a lot of logic like that.

@sLite: Note also #964.

@gracjan had some time issues lately, but i will look into this by the end of the week.

But i'm afraid that my experience with EL isn't nearly enough to tackle #964

Putting that aside, is the allegedly decrease in coverage something i have to care about to get this PR merged? I don't see how changing the find commandline should change code coverage, but maybe i'm missing something :>

coverage is not a problem. coveralls seems to misreport this and that, we will fix the coverage reporting later. Right now this is just a hint not a rule.

I've changed the ignored directories to -prune and moved from ignoring ./dist/build to ignoring the ./dist as a whole.

Please tell me if you think that could cause any troubles.
I did this because sometimes (i'm not exactly sure when and why) stack or cabal also place .hs files in ./dist/production

This is good as it is.

Thanks.