feat: copilot completions in nvim-cmp sources

modules/assistant/copilot/config.nix

@@ -21,16 +21,21 @@ with builtins; let
   '';
 in {
   config = mkIf cfg.enable {
-    vim.startPlugins = [
-      "copilot-lua"
-      cfg.copilotNodePackage
-    ];
+    vim.startPlugins =
+      [
+        "copilot-lua"
+        cfg.copilotNodePackage
+      ]
+      ++ lib.optionals (cfg.cmp.enable) [
+        "copilot-cmp"
+      ];
 
     vim.luaConfigRC.copilot = nvim.dag.entryAnywhere ''
       require("copilot").setup({
         -- available options: https://github.com/zbirenbaum/copilot.lua
-        copilot_node_command = "${cfg.copilot_node_command}",
+        copilot_node_command = "${cfg.copilotNodeCommand}",
         panel = {
+          enabled = ${lib.boolToString (!cfg.cmp.enable)},
           keymap = {
             jump_prev = false,
             jump_next = false,
@@ -44,6 +49,7 @@ in {
           },
         },
         suggestion = {
+          enabled = ${lib.boolToString (!cfg.cmp.enable)},
           keymap = {
             accept = false,
             accept_word = false,
@@ -54,6 +60,10 @@ in {
           },
         },
       })
+
+      ${lib.optionalString (cfg.cmp.enable) ''
+        require("copilot_cmp").setup()
+      ''}
     '';
 
     vim.maps.normal = mkMerge [

modules/assistant/copilot/copilot.nix

@@ -10,6 +10,7 @@ with builtins; let
 in {
   options.vim.assistant.copilot = {
     enable = mkEnableOption "GitHub Copilot AI assistant";
+    cmp.enable = mkEnableOption "nvim-cmp integration for GitHub Copilot";
 
     panel = {
       position = mkOption {
@@ -91,16 +92,22 @@ in {
       };
     };
 
-    copilot_node_command = mkOption {
+    copilotNodeCommand = mkOption {
       type = types.str;
       default = "${lib.getExe cfg.copilotNodePackage}";
-      description = "Path to nodejs";
+      description = ''
+        The command that will be executed to initiate nodejs for GitHub Copilot.
+        Recommended to leave as default.
+      '';
     };
 
     copilotNodePackage = mkOption {
-      type = with types; nullOr package; # TODO - maybe accept a path as well? imperative users might want to use something like nvm
-      default = pkgs.nodejs-slim; # this will likely need to be downgraded because Copilot does not stay up to date with NodeJS
-      description = "The package that will be used for Copilot. NodeJS v18 is recommended.";
+      type = with types; nullOr package;
+      default = pkgs.nodejs-slim;
+      description = ''
+        The nodeJS package that will be used for GitHub Copilot. If you are using a custom node command
+        you may want to set this option to null so that the package is not pulled from nixpkgs.
+      '';
     };
   };
 }

modules/completion/nvim-cmp/config.nix

@@ -49,6 +49,7 @@ in {
       "buffer" = "[Buffer]";
       "crates" = "[Crates]";
       "path" = "[Path]";
+      "copilot" = "[Copilot]";
     };
 
     vim.maps.insert = mkMerge [