feat(context): add current buffer to selected file ctx (#941)

lua/avante/sidebar.lua

@@ -826,6 +826,21 @@ end
 function Sidebar:on_mount(opts)
   self:refresh_winids()
 
+  -- Add keymap to add current buffer while sidebar is open
+  if Config.mappings.files and Config.mappings.files.add_current then
+    vim.keymap.set("n", Config.mappings.files.add_current, function()
+      if self:is_open() and self.file_selector:add_current_buffer() then
+        vim.notify("Added current buffer to file selector", vim.log.levels.DEBUG, { title = "Avante" })
+      else
+        vim.notify("Failed to add current buffer", vim.log.levels.WARN, { title = "Avante" })
+      end
+    end, {
+      desc = "avante: add current buffer to file selector",
+      noremap = true,
+      silent = true,
+    })
+  end
+
   api.nvim_set_option_value("wrap", Config.windows.wrap, { win = self.result_container.winid })
 
   local current_apply_extmark_id = nil