refactor: Move dfs to utils

lua/symbols-outline.lua

@@ -157,18 +157,6 @@ function M._set_all_folded(folded, nodes)
   _update_lines()
 end
 
-local function _items_dfs(callback, children)
-  children = children or M.state.outline_items
-
-  for _, val in ipairs(children) do
-    callback(val)
-
-    if val.children then
-      _items_dfs(callback, val.children)
-    end
-  end
-end
-
 function M._highlight_current_item(winnr)
   local has_provider = providers.has_provider()
 
@@ -210,7 +198,7 @@ function M._highlight_current_item(winnr)
     end
   end
 
-  _items_dfs(cb)
+  utils.items_dfs(cb, M.state.outline_items)
 
   _update_lines()
 

lua/symbols-outline/utils/init.lua

@@ -38,6 +38,16 @@ function M.debounce(f, delay)
   end
 end
 
+function M.items_dfs(callback, children)
+  for _, val in ipairs(children) do
+    callback(val)
+
+    if val.children then
+      M.items_dfs(callback, val.children)
+    end
+  end
+end
+
 ---Merges a symbol tree recursively, only replacing nodes
 ---which have changed. This will maintain the folding
 ---status of any unchanged nodes.
@@ -53,17 +63,14 @@ M.merge_items_rec = function(new_node, old_node, index, parent)
   else
     for key, _ in pairs(new_node) do
       if
-        vim.tbl_contains(
-          {
+        vim.tbl_contains({
           'parent',
           'children',
           'folded',
           'hovered',
           'line_in_outline',
           'hierarchy',
-          },
-          key
-        )
+        }, key)
       then
         goto continue
       end