Cabal instructions don't work

[hasufell]

I set the cabal new-repl instructions and they don't work:

Calling type info yields:

Undefined variable g:intero_backend_info
Invalid arguments for function intero#process#backend_info#version_gte
Invalid expression: intero#process#backend_info#version_gte( g:intero_Backend_info.version [8, 0, 1])

InterOpen yields:

No cabal.project file or cabal file matching the default gl
ob './*.cabal' was found.
Please create a package description file <pkgname>.cabal or
 a cabal.project file referencing the packages you want to
build.


[Process exited 1]

[vasalf]

I'm facing the same issue right now. Is there any workaround?

[parsonsmatt]

@owickstrom any thoughts?

[vasalf]

It seems that if I open file src/Main.hs, intero-neovim runs cabal in src/, not in ., so cabal doesn't see my <pkgname>.cabal file.
I guess it is controlled by cwd parameter for intero_backend. I'll now try to find out what should I write there to make it work.

[vasalf]

I only deleted the cwd line from the config and it worked.
Hope it helps others facing the same issue.
@parsonsmatt maybe there should be a note about that in README?

[parsonsmatt]

I don't use cabal work flows so I'm not sure what would be helpful - a PR would be welcome 😄

[owickstrom]

@hasufell @vasalf It's been a while since I used this plugin, but I can think of a few options (untested):

1. Set the cwd to a string with the absolute path to your project directory containing the .cabal file (you can use .nvimrc files to set it per-project)
2. Use plain ghci instead of cabal new-repl (if you have Cabal write the GHC environment file then GHCi will pick it up, but you might need to add -isrc or similar for source directories)
3. Qualify the REPL command with an explicit target, e.g. cabal new-repl exe:my-project-app

And yeah, that example config used a Vim function to expand the directory path of the current file, I think. Maybe that should be removed from the example, not sure why it's there.

[alexkalderimis]

In my case, I have the following in my project-local .nvimrc file and it works correctly:

let g:intero_backend = {
        \ 'command': 'cabal new-repl'
        \}