'hpc-coveralls': command not found

[mrkkrp]

Hello, thank you for this project. I've modified .travis.yml file according to instructions given in readme file: mrkkrp/megaparsec@05c92cb

However, the command hpc-coveralls is not available, although package hpc-coveralls seems to be installed successfully: https://travis-ci.org/mrkkrp/megaparsec/jobs/73749896#L692

Can you tell what may be wrong and how to fix it?

[mrkkrp]

OK, I've exported PATH so it can find it: https://travis-ci.org/mrkkrp/megaparsec/jobs/73844122#L693

But as you can see it doesn't work this way as well... I've read several .travis.yml files of various projects that "work", but I cannot find any difference.

[mrkkrp]

Some comment would be much appreciated.

[killy971]

Sorry for the delay in my response.
I'm going to investigate as soon as I can.

[killy971]

I had a quick look at the build log of your project on Travis CI, and it looks like the problem is not about finding the hpc-coveralls executable, but rather the .mix files.
From what I see, it is very likely to be the same problem as the one tracked by the issue #44, which should soon be fixed.

[mrkkrp]

@guillaume-nargeot, thank you for your response. Please note that I had to export new value of PATH, without it Travis cannot find hpc-coveralls anyway. If you think it's OK, please add instructions to your README.md file so people know that they need to export PATH manually. However, other projects don't seem to need to do this, so I wonder if this is just a manifestation of another problem in my case.

[killy971]

Thank you for reporting this, I will investigate further what is different in your project setup that makes Travis unable to find hoc-coveralls without export its PATH

[mrkkrp]

@guillaume-nargeot I don't want to seem impatient, but is there any update on this issue?

[killy971]

I'm wondering if this could be due to the fact that your travis config uses language: c instead of language: haskell (which may add ~/.cabal/bin to the PATH behind the scene).

Is there a particular reason why you're using language: c?

[mrkkrp]

@guillaume-nargeot, since Megaparsec requires GHC 7.10 to work, I couldn't use built-in solutions provided by Travis CI. Common practice is to use https://github.com/hvr/multi-ghc-travis in this case, which provides GHC 7.10 and can be used to test several combinations of GHC/Cabal. It even supports testing with development version of GHC.

So, I took example .travis.yml file as base and edited it to suit needs of our project. As you can see the file contains the following lines:

# NB: don't set `language: haskell` here
language: c

Maybe language: haskell would cause some sort of conflict with built-in functionality?

[mrkkrp]

Hi, @guillaume-nargeot, I've changed language setting to language: haskell and it improved the situation. You should probably include a note about language: haskell in your README.md file or something.

However, it still doesn't work: https://travis-ci.org/mrkkrp/megaparsec/jobs/77906944#L819

It says:

hpc-coveralls: can not find megap_KmgWkNOHHG00KMntE4AAGg/Text.Megaparsec.String in ["dist/hpc/vanilla/mix/megap_KmgWkNOHHG00KMntE4AAGg/"]

Text.Megaparsec.String is a module in library, I use it as a helper in tests too (definitions from the module are used), but I don't test function in it. So, HPC doesn't create directory for it. I've tried this:

after_script:
 - cabal install hpc-coveralls
 - hpc-coveralls --coverage-mode=StrictlyFullLines
                 --exclude-dir=tests
                 --exclude-dir=old-tests
                 --exclude-dir=benchmarks
                 --exclude-dir=Text/Megaparsec/ByteString
                 --exclude-dir=Text/Megaparsec/Text
                 tests old-tests

without success. Can you advise something?

[mrkkrp]

Now it works, close the issue if you consider the problem solved.

[killy971]

I think it must have been solved by fixing the issue #44.
Happy to see that it finally works for you!

[mrkkrp]

@guillaume-nargeot, Thanks for your support!