`FsAutocomplete` no longer supports the `--enable-background-services` flag

[OmanF]

Describe the bug The instructions call for setting the plugin with the flag --enable-background-services (both locally, and globally, installed FsAutocomplete), however when running fsautocomplete from the CLI, it errors, showing the flag is no longer supported.

As a result, the plugin doesn't trigger LSP integration with NVIM.

To Reproduce Steps to reproduce the behavior:

1. Follow installing the plugin (Ionide-vim) according to the README file.
2. Make sure to set the correct behavior for the fsharp#fsautocomplete_command section of the settings, according to whether you have fsautocomplete installed locally or globally.

Expected behavior No errors in the plugin integration with both fsautocomplete and Nvim.

Environment (please complete the following information):

• OS: ArchLinux (latest, updated every day at noon).
• Vim / Neovim version: 0.8.0 (Release build type).
• dotnet SDK version: 6.0.110.
• mono / .Net Framework version: N/A

Additional context For some reason, when opening .fs or .fsx, or .fsi files, Nvim's built-in LSP client recognizes them as Forth files, not F# ones.

[baronfel]

That flag was removed in recent versions of FSAC - it was used to spawn a background check process that was removed from the service. It should be removed from the command spawn args if possible.

[OmanF]

I'll describe what I've tried and my Nvim config:

• I install the plugin with Plug 'ionide/Ionide-vim' (I took off the make fsautocomplete according to the README).
• On a project, I installed fsautocomplete locally (dotnet tool install fsautocomplete) and in my config file I have:

  let g:fsharp#fsautocomplete_command =
  \ [ 'dotnet',
  \   'fsautocomplete'
  \ ]

• I then uninstalled fsautocomplete locally, and installed it globally (dotnet tool uninstall fsautocomplete && dotnet tool install -g fsautcomplete), and in my config file I put: let g:fsharp#fsautocomplete_command = [ 'fsautocomplete' ]

This covers both behaviors: local, and globally installed fsautocomplete. As I said, neither integrates well, and the LSP client says the .fs file is a Forth file.

(Let me know what more needs testing. :D)

[OmanF]

I've done a lot of dotnet paket install-ing today, and, while I don't know what exactly was the issue that was fixed by which package... apparently this issue is a non-issue and my mistake.

None the less, with regards to the --enable-background-services flag which was removed:

• If installing fsautocomplete locally, put let g:fsharp#fsautocomplete_command = [ 'dotnet', 'fsautocomplete' ] in you config file.
• If installing fsautocomplete globally, shorten the command to let g:fsharp#fsautocomplete_command = [ 'fsautocomplete' ].

The plugin is working for me just fine. Closing and thanks to Cannonarin and Chet Husk (Baronfel) for their comments and work.