added nvim-tree integration to avanete

plugins/avante.nix

@@ -130,5 +130,39 @@
         # };
       };
     };
+
+    nvim-tree = {
+      # Add "ga" keybinding to add to Avante context
+      onAttach.__raw = ''
+        function(bufnr)
+          local api = require 'nvim-tree.api'
+          api.config.mappings.default_on_attach(bufnr)
+
+          local add_file_to_avante_ctx = function()
+            local sidebar = require('avante').get()
+
+            if not (sidebar and sidebar:is_open()) then
+              return
+            end
+
+            local node = api.tree.get_node_under_cursor()
+
+            if not (node and node.type == 'file') then
+              return
+            end
+
+            sidebar.file_selector:add_selected_file(node.absolute_path)
+          end
+
+          vim.keymap.set('n', 'ga', add_file_to_avante_ctx, {
+            desc = 'add to Avante context',
+            buffer = bufnr,
+            noremap = true,
+            silent = true,
+            nowait = true,
+          })
+        end
+      '';
+    };
   } else {};
 }