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";
     };

users/myuser/neovim/aaa/init.lua

@@ -33,7 +33,12 @@ opt.title = false -- Sets the window title
 --opt.titlestring = "%t%( %M%)%( (%{expand(\"%:~:.:h\")})%) - nvim" -- The format for the window title
 
 -- Hide line numbers in terminal windows
-vim.api.nvim_exec([[au BufEnter term://* setlocal nonumber]], false)
+vim.api.nvim_create_autocmd("BufEnter", {
+	pattern = "term://*",
+	callback = function()
+		vim.bo.number = false
+	end,
+})
 
 ----------------------------------------------------------------------------------------------------
 -- Editing behavior

users/myuser/neovim/default.nix

@@ -3,23 +3,27 @@
   pkgs,
   ...
 }: {
-  programs.neovim-custom.package = let
-    nvimConfig =
-      pkgs.neovimUtils.makeNeovimConfig {
-        wrapRc = false;
-        withPython3 = true;
-        withRuby = true;
-        withNodeJs = true;
-        #extraPython3Packages = p: [];
-        #plugins = [
-        #  { plugin = pkgs.; config = ''''; optional = false; }
-        #];
-      }
-      // {
-        wrapperArgs = ["--add-flags" "--clean -u ${./aaa/init.lua}"];
-      };
-  in
-    pkgs.wrapNeovimUnstable pkgs.neovim-unwrapped nvimConfig;
+  programs.neovim-custom = {
+    config = {
+      withPython3 = false;
+      withRuby = false;
+      withNodeJs = false;
+      #extraPython3Packages = p: [];
+      plugins = with pkgs.vimPlugins; [
+        {
+          plugin = neo-tree-nvim;
+          config =
+            /*
+            lua
+            */
+            ''
+              require("neo-tree").setup {}
+            '';
+        }
+      ];
+    };
+    init = builtins.readFile ./aaa/init.lua;
+  };
 
   home.packages = let
     nvimConfig = pkgs.neovimUtils.makeNeovimConfig {
@@ -36,5 +40,4 @@
     "nvim/init.lua".source = ./init.lua;
     "nvim/lua".source = ./lua;
   };
-  home.sessionVariables.E = "${config.programs.neovim-custom.package}/bin/nvim";
 }