feat: option to autostart debugger UI

modules/debugger/nvim-dap/config.nix

@@ -7,17 +7,32 @@ with lib;
 with builtins; let
   cfg = config.vim.debugger.nvim-dap;
 in {
-  config = mkIf cfg.enable {
+  config = mkMerge [
-    vim.startPlugins =
+    (mkIf cfg.enable {
-      [
+      vim.startPlugins = ["nvim-dap"];
-        "nvim-dap"
-      ]
-      ++ optionals cfg.ui.enable [
-        "nvim-dap-ui"
-      ];
 
-    vim.luaConfigRC.nvim-dap-ui = nvim.dag.entryAnywhere ''
+      vim.luaConfigRC.nvim-dap =
-      require("dapui").setup()
+        nvim.dag.entryAnywhere ''
-    '';
+        '';
-  };
+    })
+    (mkIf (cfg.enable && cfg.ui.enable) {
+      vim.startPlugins = ["nvim-dap-ui"];
+
+      vim.luaConfigRC.nvim-dap-ui = nvim.dag.entryAfter ["nvim-dap"] (''
+          local dapui = require("dapui")
+          require("dapui").setup()
+        ''
+        + optionalString cfg.ui.autoStart ''
+          dap.listeners.after.event_initialized["dapui_config"] = function()
+            dapui.open()
+          end
+          dap.listeners.before.event_terminated["dapui_config"] = function()
+            dapui.close()
+          end
+          dap.listeners.before.event_exited["dapui_config"] = function()
+            dapui.close()
+          end
+        '');
+    })
+  ];
 }

modules/debugger/nvim-dap/nvim-dap.nix

@@ -5,6 +5,11 @@ with lib; {
 
     ui = {
       enable = mkEnableOption "Enable UI extension for nvim-dap";
+      autoStart = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Automatically Opens and Closes DAP-UI upon starting/closing a debugging session";
+      };
     };
   };
 }