Nix Extra

lang.nix adds Nix support through the nil language server with nixfmt formatting.

Enable it

-- ~/.config/blak/lua/blak/user.lua
return {
  extras = {
    enabled = {
      "lang.nix",
    },
  },
}

Or enable it interactively:

:BlakExtras enable lang.nix

What it adds

Surface	Contribution
Treesitter	nix
Mason	nixfmt
LSP	nil_ls
Formatting	nixfmt for nix

nil_ls installs automatically through Mason (package nil).

Format with alejandra instead

To format with alejandra instead of nixfmt, override the formatter:

return {
  extras = { enabled = { "lang.nix" } },
  mason = { ensure_installed = { "alejandra" } },
  format = {
    formatters_by_ft = {
      nix = { "alejandra" },
    },
  },
}

Install and verify

:BlakToolsInstall
:BlakTreesitterInstall
:BlakDoctor

Open a .nix file and check :LspInfo for nil.