feat(neovim): abstract custom config boilerplate away

users/modules/neovim.nix

@@ -3,15 +3,72 @@
   config,
   pkgs,
   ...
-}: {
+}: let
+  inherit
+    (lib)
+    concatMapStrings
+    flip
+    mkEnableOption
+    mkIf
+    mkOption
+    mkPackageOption
+    types
+    ;
+
+  cfg = config.programs.neovim-custom;
+
+  initLuaContent = ''
+    ${cfg.initEarly}
+
+    -- Begin plugin configuration
+    ${concatMapStrings (x: "${x.config}\n") (cfg.config.plugins or [])}
+    -- End plugin configuration
+
+    ${cfg.init}
+  '';
+
+  nvimConfig =
+    pkgs.neovimUtils.makeNeovimConfig cfg.config
+    // {
+      wrapRc = false;
+      wrapperArgs = ["--add-flags" "-u ${pkgs.writeText "init.lua" initLuaContent}"];
+    };
+
+  finalPackage =
+    flip pkgs.wrapNeovimUnstable nvimConfig
+    (cfg.package.overrideAttrs (_final: prev: {
+      nativeBuildInputs = (prev.nativeBuildInputs or []) ++ [pkgs.makeWrapper];
+      postInstall =
+        (prev.postInstall or "")
+        + ''
+          wrapProgram $out/bin/nvim --add-flags "--clean"
+        '';
+    }));
+in {
   options.programs.neovim-custom = {
-    enable = lib.mkEnableOption "Neovim";
-    package = lib.mkPackageOption pkgs "neovim" {};
+    enable = mkEnableOption "Neovim";
+    package = mkPackageOption pkgs "neovim-unwrapped" {};
+    config = mkOption {
+      description = "The neovim configuration to use (passed to makeNeovimConfig and then to wrapNeovimUnstable)";
+      default = {};
+      type = types.anything;
+    };
+    initEarly = mkOption {
+      description = "The early init.lua content that will be added before plugin configs.";
+      default = "";
+      type = types.lines;
+    };
+    init = mkOption {
+      description = "The init.lua content, added after plugin configs.";
+      default = "";
+      type = types.lines;
+    };
   };
 
-  config = lib.mkIf config.programs.neovim-custom.enable {
+  config = mkIf cfg.enable {
     home = {
-      # TODO packages = [config.programs.neovim-custom.package];
+      # XXX: TODO packages = [finalPackage];
+      shellAliases.E = "${finalPackage}/bin/nvim";
       sessionVariables.EDITOR = "nvim";
       shellAliases.vimdiff = "nvim -d";
     };