Implicit cradle failure: /home/user/.cabal: openFile: inappropriate type (is a directory)

[georgefst]

The implicit cradle support is unfortunately completely broken for me, with an impenetrable error ($HOME/.cabal is indeed a directory...):

haskell-language-server version: 0.4.0.0 (GHC: 8.10.2) (PATH: /home/gthomas/.cabal/bin/haskell-language-server)
(haskell-language-server)Ghcide setup tester in /home/gthomas/Desktop/tmp.
Report bugs at https://github.com/haskell/haskell-language-server/issues

Tool versions found on the $PATH
cabal:          3.2.0.0
stack:          Not found
ghc:            8.10.2


Step 1/4: Finding files to test in /home/gthomas/Desktop/tmp
Found 1 files

Step 2/4: Looking for hie.yaml files that control setup
Found 1 cradle

Step 3/4: Initializing the IDE

Step 4/4: Type checking the files
[INFO] Consulting the cradle for "Tmp.hs"
NotShowMessage (NotificationMessage {_jsonrpc = "2.0", _method = WindowShowMessage, _params = ShowMessageParams {_xtype = MtWarning, _message = "No [cradle](https://github.com/mpickering/hie-bios#hie-bios) found for Tmp.hs.\n Proceeding with [implicit cradle](https://hackage.haskell.org/package/implicit-hie)"}})
File:     /home/gthomas/Desktop/tmp/Tmp.hs
Hidden:   no
Range:    1:0-2:0
Source:   compiler
Severity: DsError
Message:  /home/gthomas/.cabal: openFile: inappropriate type (is a directory)
Files that failed:
 * /home/gthomas/Desktop/tmp/Tmp.hs

Completed (0 files worked, 1 file failed)
[INFO] finish: User TypeCheck (took 0.00s)

This occurs with all cabal projects or standalone files that I've tried.

[jneira]

@georgefst weird error, does the file $HOME/.cabal exists? It seems that filedirectory breaks the hie-implicit logic of discovering the .cabal file, that needs to be fixed

[georgefst]

@jneira Ha right, thanks, I can see what's happening there...

Unfortunately $HOME/.cabal is the default directory for cabal on Linux (containing config, store etc.). Changing that logic to ignore directories is probably enough.

[jneira]

A direct workaround could be move the project out of $HOME directory, sorry for the inconveniences! we will try to fix it asap.
Another better one (thanks @wz1000!) could be create a hie.yaml file, following the README instructions: https://github.com/haskell/haskell-language-server#project-configuration

[arjunkathuria]

hi. the working solution i got from IRC was.

make a hie.yaml file in your project root folder with the following contents

cradle: {direct: {arguments: []}}

note:-
OS: linux Debian
ghc:- 8.10.2

[georgefst]

@arjunkathuria Yes, that's what I settled on as well.

Though, to be clear, that's just a workaround for the regression that direct cradles have stopped working implicitly. For actually utilising more complex implicit cradles, the only options seems to be to move our projects out of $HOME, as @jneira said.

Anyway, the fix is already on the way, and I imagine it'll make it for next HLS release.

[arjunkathuria]

@georgefst sweet!
Another win for good bug reports 💯.

prompt maintainer responses are always appreciated, no matter the bug. thanks @jneira : )

[jneira]

Reopen until the fix is included in ghcide/hls