Neovim plugins are now more often than not written in lua.
One advantage of the lua ecosystem over vim's is the existence of
luarocks and the rockspec format, which allows to specify a package
dependencies formally.
I would like more neovim plugins to have a formal description,
"rockspec" being the current candidate.
This MR allows to use nix lua packages as neovim plugins, so as to enjoy
every benefit that rockspecs bring:
- dependdency discovery
- ability to run test suite
- luarocks versioning
- rockspec metadata
the vim update.py script will check if an attribute with the vim plugin
pname exists in lua51Packages. If it does, it uses
buildNeovimPluginFrom2Nix on it, which modifies the luarocks config to
do an almost flat install (luarocks will install the package in the lua
folder instead of share/5.1/lua etc).
It also calls toVimPlugin on it to get all the vim plugin niceties.
The list of packages that could benefit from this is available at
https://luarocks.org/labels/neovim
but I hope it grows.
Goal is to improve separation between packages and utilities.
Can help with autocompletion/navigate nixpkgs faster.
Also it will help standardize how LUA_PATH is exported across packages,
so that one can more easily make lua changes across nixpkgs (for
instance changing where lua modules are installed).
* neovim: temporary revert to unbreak user configs
Newly introduced "plugins" parameter is disabled until we get a better
testing infrastructure to minimize breaking changes.
Current nixpkgs always wraps neovim with the "-u" which has sideeffects as explained in https://github.com/NixOS/nixpkgs/issues/55376 :
1. vim won't set the variable $MYVIMRC as explained #34215
2. vim skips loading folder-specific .vimrc / .nvimrc
I wanted to provide a way for users to better control what flags are used to wrap neovim. This is achived by introducing wrapNeovimUnstable et neovimUtils, utilities to help with that. We provide a compatibility layer so that wrapNeovim still works and to let us experiment with wrapNeovimUnstable to better control neovim configuration, plugin dependencies, haskell environment etc so that it becomes easier to generate per-project neovim config.
With this commit, it's possible for instance for home-manager to wrap neovim without the `-u` and just write the config in the
expected $XDG_CONFIG_HOME/nvim/init.vim .
Expect wrapNeovimUnstable interface to evolve in the upcoming months.
