Auto create .luarc.json

.gitignore

@@ -1,2 +1,3 @@
 result
 log
+.luarc.json

flake.nix

@@ -109,9 +109,31 @@
 
     packages = eachSystem (system: let
       pkgs = nixpkgs.legacyPackages.${system};
+      vim = import ./nvim (inputs
+        // {
+          inherit pkgs;
+          lib = nixpkgs.lib;
+        });
     in rec {
       default = nvim;
-      nvim = import ./nvim (inputs // { inherit pkgs; lib = nixpkgs.lib; });
+      nvim = vim.nvim;
+    });
+
+    devShells = eachSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+      vim = import ./nvim (inputs
+        // {
+          inherit pkgs;
+          lib = nixpkgs.lib;
+        });
+    in rec {
+      default = nvim-lua;
+      nvim-lua = pkgs.mkShell {
+        name = "nvim-lua";
+        shellHook = ''
+          ln -fs ${vim.luarc} .luarc.json
+        '';
+      };
     });
   };
 }

nvim/nix/luarc.nix

@@ -0,0 +1,69 @@
+{
+  pkgs,
+  lib,
+  ...
+}: {
+  nvim,
+  plugins ? {
+    start = [];
+    opt = [];
+  },
+  meta ? {luvit = true;},
+  lua-version ? "5.1",
+  disabled-diagnostics ? [],
+}: let
+  # stolen from https://github.com/mrcjkb/nix-gen-luarc-json
+  pluginPackages =
+    map (
+      x:
+        if x ? plugin
+        then x.plugin
+        else x
+    )
+    (plugins.start ++ plugins.opt);
+  partitions = builtins.partition (plugin:
+    plugin.vimPlugin
+    or false
+    || plugin.pname or "" == "nvim-treesitter")
+  pluginPackages;
+  nvim-plugins = partitions.right;
+  rocks = partitions.wrong;
+  plugin-luadirs = builtins.map (plugin: "${plugin}/lua") nvim-plugins;
+  pkg-libdirs = builtins.map (pkg: "${pkg}/lib/lua/${lua-version}") rocks;
+  pkg-sharedirs = builtins.map (pkg: "${pkg}/share/lua/${lua-version}") rocks;
+
+  luarc = {
+    "$schema" = "https://raw.githubusercontent.com/sumneko/vscode-lua/master/setting/schema.json";
+    runtime = {
+      version = "LuaJIT";
+    };
+    workspace = {
+      checkThirdParty = false;
+      library =
+        [
+          "${nvim}/share/nvim/runtime/lua"
+          "$VIMRUNTIME/lua"
+          "\${3rd}/busted/library"
+          "\${3rd}/luassert/library"
+        ]
+        ++ plugin-luadirs
+        ++ pkg-libdirs
+        ++ pkg-sharedirs
+        ++ (lib.optional (meta.luvit or false) "${pkgs.vimPlugins.luvit-meta}/library");
+      ignoreDir = [
+        ".git"
+        ".github"
+        ".direnv"
+        "result"
+        "nix"
+        "doc"
+      ];
+    };
+    diagnostics = {
+      libraryFiles = "Disable";
+      globals = ["vim"];
+      disable = disabled-diagnostics;
+    };
+  };
+in
+  (pkgs.formats.json {}).generate ".luarc.json" luarc

nvim/nix/mknvim.nix

@@ -4,11 +4,12 @@
   stdenv,
   ...
 }: {
+  name ? "nvim",
   package ? pkgs.neovim,
   config,
   plugins ? {
     start = [];
-    opts = [];
+    opt = [];
   },
   extraPackages ? [],
   extraLuaPackages ? p: [],
@@ -17,21 +18,19 @@
   withPerl ? false,
   withRuby ? false,
   withNodeJs ? false,
-  withSqlite ? false,
 }: let
   builder = (import ./bytecompile.nix) {inherit pkgs lib;};
   pack = (import ./pack.nix) {inherit pkgs lib;};
+  mkLuarc = (import ./luarc.nix) {inherit pkgs lib;};
 
   nvim = builder.byteCompileVim package;
 
   # TODO: only the (unused) init.lua seems to be byte compiled, idk why
-  conf = builder.byteCompileLuaDrv (
-    (pkgs.runCommandLocal "nvim-config" {} ''
-      mkdir $out
-      cp -r ${config}/* $out
-      ls $out
-    '')
-  );
+  conf = builder.byteCompileLuaDrv (pkgs.runCommandLocal "nvim-config" {} ''
+    mkdir $out
+    cp -r ${config}/* $out
+    ls $out
+  '');
 
   pluginPack = let
     normalize = optional: p: let
@@ -62,7 +61,7 @@
 
     withDeps = p: [p] ++ builtins.concatMap withDeps (map (normalize false) (p.plugin.dependencies or []));
 
-    plugs = (map (normalize false) plugins.start) ++ (map (normalize true) plugins.opts);
+    plugs = (map (normalize false) plugins.start) ++ (map (normalize true) plugins.opt);
     allPlugs = lib.unique (builtins.concatMap withDeps plugs);
     partitioned = builtins.partition (p: p.optional) (preparePlugins allPlugs);
     opt = map (p: p.plugin) partitioned.right;
@@ -90,8 +89,8 @@
 
       ${builtins.readFile (config + "/init.lua")}
     '';
-in
-  pkgs.wrapNeovimUnstable nvim {
+in {
+  ${name} = pkgs.wrapNeovimUnstable nvim {
     wrapRc = false;
     wrapperArgs = builtins.concatStringsSep " " [
       (lib.optionals (extraPackages != []) ''--prefix PATH : "${lib.makeBinPath extraPackages}"'')
@@ -99,4 +98,7 @@ in
     ];
 
     inherit withPython3 withNodeJs withPerl withRuby extraPython3Packages extraLuaPackages;
-  }
+  };
+
+  luarc = mkLuarc { nvim = package; inherit plugins; };
+}

nvim/nix/pack.nix

@@ -16,6 +16,7 @@
       "/keymap"
       "/lang"
       "/lua"
+      "/lsp"
       "/pack"
       "/parser"
       "/plugin"