feat(view): allow function for view.float.open_win_config (#1538)

Author: alex-courtis

doc/nvim-tree-lua.txt

@@ -669,7 +669,7 @@ Window / buffer setup.
 
         *nvim-tree.view.float.open_win_config*
         Floating window config. See |nvim_open_win| for more details.
-          Type: `table`, Default:
+          Type: `table` or `function` that returns a table, Default:
             `{`
               `relative = "editor",`
               `border = "rounded",`

lua/nvim-tree/view.lua

@@ -133,9 +133,17 @@ local function set_window_options_and_buffer()
   end
 end
 
+local function open_win_config()
+  if type(M.View.float.open_win_config) == "function" then
+    return M.View.float.open_win_config()
+  else
+    return M.View.float.open_win_config
+  end
+end
+
 local function open_window()
   if M.View.float.enable then
-    a.nvim_open_win(0, true, M.View.float.open_win_config)
+    a.nvim_open_win(0, true, open_win_config())
   else
     a.nvim_command "vsp"
     M.reposition_window()