refactor(#2886): multi instance: node class refactoring (#2950)

* add todo

* refactor(#2886): multi instance: node class refactoring: extract links, *_git_status (#2944)

* extract DirectoryLinkNode and FileLinkNode, move Node methods to children

* temporarily move DirectoryNode methods into BaseNode for easier reviewing

* move mostly unchanged DirectoryNode methods back to BaseNode

* tidy

* git.git_status_file takes an array

* update git status of links

* luacheck hack

* safer git_status_dir

* refactor(#2886): multi instance: node class refactoring: DirectoryNode:expand_or_collapse (#2957)

move expand_or_collapse to DirectoryNode

* refactor(#2886): multi instance: node group functions refactoring (#2959)

* move last_group_node to DirectoryNode

* move add BaseNode:as and more doc

* revert parameter name changes

* revert parameter name changes

* add Class

* move group methods into DN

* tidy group methods

* tidy group methods

* tidy group methods

* tidy group methods

* parent is DirectoryNode

* tidy expand all

* BaseNode -> Node

* move watcher to DirectoryNode

* last_group_node is DirectoryNode only

* simplify create-file

* simplify parent

* simplify collapse-all

* simplify live-filter

* style

* more type safety

lua/nvim-tree/node/directory-link.lua

@@ -0,0 +1,54 @@
+local git = require("nvim-tree.git")
+
+local DirectoryNode = require("nvim-tree.node.directory")
+
+---@class (exact) DirectoryLinkNode: DirectoryNode
+---@field link_to string absolute path
+---@field fs_stat_target uv.fs_stat.result
+local DirectoryLinkNode = DirectoryNode:new()
+
+---Static factory method
+---@param explorer Explorer
+---@param parent DirectoryNode
+---@param absolute_path string
+---@param link_to string
+---@param name string
+---@param fs_stat uv.fs_stat.result?
+---@param fs_stat_target uv.fs_stat.result
+---@return DirectoryLinkNode? nil on vim.loop.fs_realpath failure
+function DirectoryLinkNode:create(explorer, parent, absolute_path, link_to, name, fs_stat, fs_stat_target)
+  -- create DirectoryNode with the target path for the watcher
+  local o = DirectoryNode:create(explorer, parent, link_to, name, fs_stat)
+
+  o = self:new(o) --[[@as DirectoryLinkNode]]
+
+  -- reset absolute path to the link itself
+  o.absolute_path = absolute_path
+
+  o.type = "link"
+  o.link_to = link_to
+  o.fs_stat_target = fs_stat_target
+
+  return o
+end
+
+-----Update the directory GitStatus of link target and the file status of the link itself
+-----@param parent_ignored boolean
+-----@param status table|nil
+function DirectoryLinkNode:update_git_status(parent_ignored, status)
+  self.git_status = git.git_status_dir(parent_ignored, status, self.link_to, self.absolute_path)
+end
+
+---Create a sanitized partial copy of a node, populating children recursively.
+---@return DirectoryLinkNode cloned
+function DirectoryLinkNode:clone()
+  local clone = DirectoryNode.clone(self) --[[@as DirectoryLinkNode]]
+
+  clone.type = self.type
+  clone.link_to = self.link_to
+  clone.fs_stat_target = self.fs_stat_target
+
+  return clone
+end
+
+return DirectoryLinkNode