feat(actions): expand all under folder (#1292)

lua/nvim-tree/actions/expand-all.lua

@@ -0,0 +1,56 @@
+local core = require "nvim-tree.core"
+local renderer = require "nvim-tree.renderer"
+local utils = require "nvim-tree.utils"
+
+local M = {}
+
+local function expand(node)
+  node.open = true
+  if #node.nodes == 0 then
+    core.get_explorer():expand(node)
+  end
+end
+
+local function gen_iterator()
+  local expansion_count = 0
+
+  local function iterate(parent)
+    if expansion_count >= M.MAX_FOLDER_DISCOVERY then
+      return true
+    end
+
+    if parent.parent and parent.nodes and not parent.open then
+      expansion_count = expansion_count + 1
+      expand(parent)
+    end
+
+    for _, node in pairs(parent.nodes) do
+      if node.nodes and not node.open then
+        expansion_count = expansion_count + 1
+        expand(node)
+      end
+
+      if node.open then
+        if iterate(node) then
+          return true
+        end
+      end
+    end
+  end
+
+  return iterate
+end
+
+function M.fn(base_node)
+  local node = base_node.nodes and base_node or core.get_explorer()
+  if gen_iterator()(node) then
+    utils.warn("expansion iteration was halted after " .. M.MAX_FOLDER_DISCOVERY .. " discovered folders")
+  end
+  renderer.draw()
+end
+
+function M.setup(opts)
+  M.MAX_FOLDER_DISCOVERY = opts.actions.expand_all.max_folder_discovery
+end
+
+return M