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Template Haskell, cannot locate file

See original GitHub issue

I’m creating a protobuf service with Haskell using the project: https://github.com/higherkindness/mu-haskell. Inside IntelliJ-Haskell, I get the following error:

error: Exception when trying to run compile-time code:
  predictor.proto: openFile: does not exist (No such file or directory)
  Code: grpc "PredictorSchema" id "predictor.proto"

On the command line stack build works as expected. File is located at:

sub-package: ...
sub-package: ...
sub-package/
   predictor.proto
   /src/Haskell-file.hs <--- this contains the grpc line failing

stack.yaml

If I put the whole local path to the file (/home/project/sub-package/predictor.proto), IntelliJ-Haskell recognizes it and removes the error. However, this is not an actual solution after it goes to our GIT. Are there any easy fixes to this issue?

Issue Analytics

State:
Created 3 years ago
Comments:7 (3 by maintainers)

Top GitHub Comments

1reaction

llattilacommented, Feb 20, 2021

If I have understood correctly, the GHCi will use the base folder of the project. As such, when it is trying to locate the proto file, it is one folder deeper. However, stack build will use a different directory when building. Found some related discussions five years ago and the Stack developers mentioned, the problems come from the GHCi interface. I could ask from their support as well, whether there is a solution. For now, I have created a very non-hacky solution by creating a symbolic link in the base folder to my sub-package file which works locally 😄

I could update this when I hear something from the Stack guys to see whether things have changed.

0reactions

llattilacommented, Feb 28, 2021

Got some good feedback from the guys at FPComplete. They suggested using the following to handle the issue:

https://hackage.haskell.org/package/file-embed-0.0.13.0/docs/Data-FileEmbed.html#v:makeRelativeToProject

This should allow one to properly handle files even if there are multiple packages.

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