Error when working with stack projects

[welf]

Every time I open an *.hs file within stack generated project and save this file, I get such error:

This error exists only when working with project files generated by command stack new project (and followed by stack setup and stack build). When I work with standalone *.hs file I don't get such error.

OSX El Capitan 10.11.1 Atom 1.2.0 haskell-ghc-mod 1.1.3 ide-haskell 1.3.5 stack 0.1.6.0 x86_64 ghc-mod version 5.4.0.0 compiled by GHC 7.10.2

Here is a log from developer console: -1447626365072.txt

[welf]

I've also installed Haskell platform with all cabals, ghc-mod, hlint etc., changed paths to it in package settings, but still get the same error. I've also tried to open same files with emacs which works with ghc-mod too, and in emacs everything goes fine.

[WillSewell]

I get the same error.

[lierdakil]

@welf, I'm confused about your PATH settings. /Users/AW/.stack/programs/x86_64-osx/ghc-7.10.2/lib/ghc-7.10.2/bin/ghc this doesn't seem like a directory name?..

[lierdakil]

As for this error, it seems ghc-mod tries to run cabal and fails. Do you have it in your PATH?

[welf]

I'm confused about your PATH settings. /Users/AW/.stack/programs/x86_64-osx/ghc-7.10.2/lib/ghc-7.10.2/bin/ghc this doesn't seem like a directory name?..

It is the PATH to globally installed by stack GHC. When I change a PATH not to GHC, but to the directory which contains GHC, I get the same error.

As for this error, it seems ghc-mod tries to run cabal and fails. Do you have it in your PATH?

When I've tried to make it work with Haskell Platform, yes, it was the PATHes to Platform's GHC and to cabal in my .bash_profile file (and I changed appropriate PATHes in haskell-ghc-mod settings). After I saw I still get the same error, I've uninstalled Haskell Platform, leaving only stack. But before it I've tried how ghc-mod works in emacs, to define whether the problem is in ghc-mod itself or in haskell-ghc-mod for Atom. It worked fine, including REPL, so emacs saw the PATH to cabal in .bash_profile.

[lierdakil]

Well, on OSX, Atom doesn't pick up on PATH in .bash_profile unless it's started from terminal (and that's primary reason why additionalPathDirectories setting exists at all). Would that make sense?

As for path to ghc, specifying path to a file instead of directory in additionalPathDirectories can lead to problems on certain platforms. I would advise you remove it. What you actually need to do is to duplicate your .bash_profile PATH there (using comma instead of colon as a separator, and dropping $PATH or other environment variables)

See https://github.com/atom/atom/issues/6956 for more details and other solutions.

Also see https://github.com/kazu-yamamoto/ghc-mod/wiki for more information on ghc-mod with stack. In particular,

Make sure the dist/setup-config file doesn't exist in your project directory (the directory also containing your *.cabal file). When this file exists ghc-mod assumes you want to use cabal-install instead of Stack.

[WillSewell]

I have set it up like you say. What I find odd now is that when I run Ghc-Mod -> Check, I get this error:

And it creates directory dist in the root of my project. Although I get this error even when I manually remove dist.

(this does not happen if I run ghc-mod standalone)

[welf]

I've tried to start atom from terminal and it works without errors, thanks.

It worked without errors also when Atom started not from terminal, after I've copy-pasted the whole PATH string from my .bash_profile file to the Additional Path Directories field in haskell-ghc-mode settings (replacing : separator to , separator). Setting only PATH to GHC in Additional Path Directories field doesn't helped, but when I've set there all PATHes from my .bash_profile file, it started to work without errors.

Thank you a lot again!

@WillSewell Make sure that you have set the right PATH to GHC globally installed by stack, executing printf '%s\n' ~/.stack/programs/*/ghc-*/bin/ in terminal.

@lierdakil

As for path to ghc, specifying path to a file instead of directory in additionalPathDirectories can lead to problems on certain platforms. I would advise you remove it.

Please change the description of Additional Path Directories field, because it is confusing at the moment, asking to indicate PATH to ghc, but not to the directory it contains:

[lierdakil]

@welf, oops. Sorry about that. I'm on it.

[lierdakil]

Okay, v1.1.5 should have a more clear description. Hope it is satisfactory.

[WillSewell]

@welf thank you! I did what you said and also installed cabal-install with stack and added its directory to Additional Path Directories. Seems to be working great now!

[lierdakil]

@WillSewell, in general, you shouldn't need cabal-install with stack. Just saying.

[welf]

Yes, I've installed cabal-install with stack too a few days ago. Don't know whether it works without it.

[thunky-monk]

I have the same issue as @WillSewell without cabal-install