graphical editor not detecting ghc/cabal/stack due to incomplete $PATH in the init config file

[dreamsmasher]

I'm having some issues with getting the extension to work right - currently, my Cabal installation is from ghcup, and Stack is built from Cabal (GHC 8.8.3). When loading projects in VSCode, I keep getting the error Project requires Cabal but it isn't installed. Stack projects give me the same error but with Stack, and the installation link just takes me to the ghcup page.

I've tried downloading the binary from the releases page and manually adding it to my configuration, as well as building it from source. No luck whatsoever, and using ghcide with the haskell-language-server-wrapper doesn't work either.

System: Arch Linux, i5-7600k, 16GB RAM, GHC 8.8.3

hie.yaml:

cradle:
  cabal:
    - path: "src/Main.hs"
      component: "mmvm:exe:mmvm"

    - path: "src/LibBinary.hs"
      component: "mmvm:exe:mmvm"

    - path: "src/Parse.hs"
      component: "mmvm:exe:mmvm"

    - path: "test"
      component: "mmvm:test:test"

    - path: "src"
      component: "mmvm:test:test"

settings.json:

{
    "editor.fontSize": 16,
    "editor.fontLigatures": true,
    "editor.fontFamily": "Hasklig", 
    "editor.fontWeight": "normal",
    "debug.console.fontFamily": "Terminus (TTF)",
    // "editor.suggestSelection": "first",
    // "vsintellicode.modify.editor.suggestSelection": "automaticallyOverrodeDefaultValue",
    "editor.cursorStyle": "block",
    "python.jediEnabled": false,
    "editor.suggestSelection": "first",
    "terminal.integrated.shell.linux": "/bin/zsh",
    "terminal.integrated.fontFamily": "Hack", 
    "terminal.integrated.fontSize": 14,
    "vscode-neovim.neovimPath": "/usr/bin/nvim",
    "vscode-neovim.neovimInitPath": "~/.config/nvim/init.vim",
    "terminal.integrated.fontWeight": "normal",
    "terminal.integrated.fontWeightBold": "bold",
    "python.pythonPath": "/bin/pypy3",
    "workbench.colorTheme": "Wal",
    "haskell.enable": true,
    "haskell.hlintOn": true,
    "C_Cpp.clang_format_path": "/usr/bin/clang",
    "telemetry.enableTelemetry": false,
    "telemetry.enableCrashReporter": false,
    "window.zoomLevel": 2,
    "haskell.logFile": "/home/normie/Documents/misc/hs-hls.log",
    "haskell.trace.server": "messages",
    "haskell.formattingProvider": "brittany"

}

Any help would be appreciated, I'm currently doing fine with ALE/neovim but I'd like to be able to use an IDE for larger projects. Thanks!

[lukel97]

This is a bit of a silly question, but have you made sure that cabal/stack are on the PATH from VS Code? I.e. can you open up a terminal in VS Code and type cabal repl/stack repl is it able to find it?

[dreamsmasher]

Yes, both cabal repl and stack repl work in the VSCode terminal.

[lukel97]

Hmm then perhaps that the PATH VS Code is launched with is different from whatever your shell is set as. Were you launching Code from a graphical shell? Is it able to find the binaries if you instead launch Code from your shell via code .?

[cronokirby]

This project:

https://github.com/cronokirby/reg-viz/tree/679ed7e7f25b67d1fc96ef4bba11e7c3c759ede2

Exhibits this error as well, at least on my Linux (Manjaro) machine.

cabal and ghc are available on the PATH, installed through ghcup, and available in the integrated terminal inside VSCode.
The project builds fine as well.
What's odd is that it was working fine when I started working on the project (before there were any haskell files, just a cabal file), and kept working until I reloaded VSCode, now it doesn't work regardless of if I launch VSCode in a terminal with code . or just open it as a desktop application.

[gwils]

I get this as well, also on Arch Linux. I got my GHC and cabal from ghcup.
edit: The version I get is Project requires GHC but it isn't installed

[lukel97]

@gwils @cronokirby @dreamsmasher Can you try cloning this branch of the extension and running it locally, and see what the PATH error message says? https://github.com/haskell/vscode-haskell/tree/path-debug
You should be able to open the project in vscode and just click the run button in the run sidebar, and it should open up another vs code window from which you can open a haskell project or the like

[dreamsmasher]

Sure thing, I’m out of town for a few days but I’ll update when I’m back. Thank you for the help so far.

(also code . didn’t work for me)

[gwils]

The PATH I get from the extension is:

PATH: /opt/google-cloud-sdk/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl

in bash/zsh I get

echo $PATH
/home/george/.cabal/bin:/home/george/.ghcup/bin:/home/george/.cabal/bin:/home/george/.ghcup/bin:/opt/google-cloud-sdk/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl

Note the extra entries on the front - they are added in my .bashrc and .zshrc, courteous of the ghcup installation script.

Edit: By the way, I tried code . from within my shell, and it seems to make it work correctly. I'll use that as a workaround for now!

[gwils]

I've found a better fix for this - rather than adding /home/george/.ghcup/bin and /home/george/.cabal/bin in my .bashrc and .zshrc, I add them in /etc/profile. If I do this, then VSCode/Haskell Language Server will happily pick up the necessary executables and run correctly.

I suspect this fix will work for others on Arch Linux and its derivatives such as Manjaro.

[yousefvand]

Maybe this is related to vscode-oss which is the official package on Arch. Path:

/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl