In my previous post, I presented a simple workflow for a fast compilation loop using ghcid and neovim.

Unfortunately, this doesn’t work with multi-package projects. This is because GHC outputs filenames relative to a package and not relative to where it runs (see this GHC issue and also this cabal issue). That means that neovim could be able to load the error file in the same way as previously, but it would not be able to find the files in the quickfix list, which would not be very useful.

To solve this, I came up with a relatively simple solution. I wrote some lua code to manually parse the error file and fill up the quickfix list prepending the relative path of the package currently loaded by ghcid. I mapped the lua function to a neovim user command, and it results in a very similar workflow as before. One just need to give to neovim the path to the package worked on.

See below for an example:

This code was present in my personal neovim config for a while. But to share it, I thought it would be easier to make a plugin out of it. And so I did. The plugin includes both approaches and is then working out of the box for both cases.

You can find it on GitHub.