How to ghc "Finding imports" on stack

[Gianluca Sant]

Hi everyone, 

I'm trying to add Stack to my existing Haskell project. however, when I try to build it with Stack I get the following error 

    File name does not match module name:

    Saw: ‘MyModuleName’

    Expected: ‘ MyModuleName. MyModuleName’

  |

4 | module MyModuleName

This is happening because I've structured the project in the following way. 

+ root

 + MyModuleName

  |---- MyModuleName

  | Main.hs

With GHC you can easily fix this issue by using "-i" flag - e.g. "-iMyModuleName". Therefore I was wondering if I can define the same "search path" on Stack.

Thanks in advance

Gianluca

[Michael Snoyman]

You can use source-dirs (in hpack/package.yaml) or hs-source-dirs (in cabal files) to specify the directory. Though standard practice these days in Haskell projects is to put the code in an src directory.

 

For more information on hpack settings and some examples, check out: https://github.com/sol/hpack#readme

[Gianluca Sant]

Hi, thanks for the reply - I will give a try. 

Though standard practice these days in Haskell projects is to put the code in an src directory.

Yes, I put it in the src folder - sorry if I haven’t provided a real project structure - basically what I have is 

+root

  | +app

    | Main.hs

  | +src

    | + MyModule

      | MyModule.hs

so, I’m following standard approach for a Stack project

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