refactor(#2941): move lib methods to explorer (#2964)

* 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

* move lib.get_cursor_position to Explorer

* move lib.get_node_at_cursor to Explorer

* move lib.get_nodes to Explorer

* move place_cursor_on_node to Explorer

* resolve resource leak in purge_all_state

* move many autocommands into Explorer

* post merge tidy

lua/nvim-tree/explorer/init.lua

@@ -1,3 +1,6 @@
+local appearance = require("nvim-tree.appearance")
+local buffers = require("nvim-tree.buffers")
+local core = require("nvim-tree.core")
 local git = require("nvim-tree.git")
 local log = require("nvim-tree.log")
 local notify = require("nvim-tree.notify")
@@ -24,7 +27,9 @@ local FILTER_REASON = require("nvim-tree.enum").FILTER_REASON
 local config
 
 ---@class (exact) Explorer: RootNode
+---@field uid_explorer number vim.uv.hrtime() at construction time
 ---@field opts table user options
+---@field augroup_id integer
 ---@field renderer Renderer
 ---@field filters Filters
 ---@field live_filter LiveFilter
@@ -58,6 +63,9 @@ function Explorer:create(path)
 
   o.explorer = o
 
+  o.uid_explorer = vim.uv.hrtime()
+  o.augroup_id = vim.api.nvim_create_augroup("NvimTree_Explorer_" .. o.uid_explorer, {})
+
   o.open = true
   o.opts = config
 
@@ -68,11 +76,111 @@ function Explorer:create(path)
   o.marks = Marks:new(config, o)
   o.clipboard = Clipboard:new(config, o)
 
+  o:create_autocmds()
+
   o:_load(o)
 
   return o
 end
 
+function Explorer:destroy()
+  log.line("dev", "Explorer:destroy")
+
+  vim.api.nvim_del_augroup_by_id(self.augroup_id)
+
+  RootNode.destroy(self)
+end
+
+function Explorer:create_autocmds()
+  -- reset and draw (highlights) when colorscheme is changed
+  vim.api.nvim_create_autocmd("ColorScheme", {
+    group = self.augroup_id,
+    callback = function()
+      appearance.setup()
+      view.reset_winhl()
+      self:draw()
+    end,
+  })
+
+  vim.api.nvim_create_autocmd("BufWritePost", {
+    group = self.augroup_id,
+    callback = function()
+      if self.opts.auto_reload_on_write and not self.opts.filesystem_watchers.enable then
+        self:reload_explorer()
+      end
+    end,
+  })
+
+  vim.api.nvim_create_autocmd("BufReadPost", {
+    group = self.augroup_id,
+    callback = function(data)
+      if (self.filters.config.filter_no_buffer or self.opts.highlight_opened_files ~= "none") and vim.bo[data.buf].buftype == "" then
+        utils.debounce("Buf:filter_buffer_" .. self.uid_explorer, self.opts.view.debounce_delay, function()
+          self:reload_explorer()
+        end)
+      end
+    end,
+  })
+
+  -- update opened file buffers
+  vim.api.nvim_create_autocmd("BufUnload", {
+    group = self.augroup_id,
+    callback = function(data)
+      if (self.filters.config.filter_no_buffer or self.opts.highlight_opened_files ~= "none") and vim.bo[data.buf].buftype == "" then
+        utils.debounce("Buf:filter_buffer_" .. self.uid_explorer, self.opts.view.debounce_delay, function()
+          self:reload_explorer()
+        end)
+      end
+    end,
+  })
+
+  vim.api.nvim_create_autocmd("BufEnter", {
+    group = self.augroup_id,
+    pattern = "NvimTree_*",
+    callback = function()
+      if utils.is_nvim_tree_buf(0) then
+        if vim.fn.getcwd() ~= core.get_cwd() or (self.opts.reload_on_bufenter and not self.opts.filesystem_watchers.enable) then
+          self:reload_explorer()
+        end
+      end
+    end,
+  })
+
+  vim.api.nvim_create_autocmd("User", {
+    group = self.augroup_id,
+    pattern = { "FugitiveChanged", "NeogitStatusRefreshed" },
+    callback = function()
+      if not self.opts.filesystem_watchers.enable and self.opts.git.enable then
+        self:reload_git()
+      end
+    end,
+  })
+
+  if self.opts.hijack_cursor then
+    vim.api.nvim_create_autocmd("CursorMoved", {
+      group = self.augroup_id,
+      pattern = "NvimTree_*",
+      callback = function()
+        if utils.is_nvim_tree_buf(0) then
+          self:place_cursor_on_node()
+        end
+      end,
+    })
+  end
+
+  if self.opts.modified.enable then
+    vim.api.nvim_create_autocmd({ "BufModifiedSet", "BufWritePost" }, {
+      group = self.augroup_id,
+      callback = function()
+        utils.debounce("Buf:modified_" .. self.uid_explorer, self.opts.view.debounce_delay, function()
+          buffers.reload_modified()
+          self:reload_explorer()
+        end)
+      end,
+    })
+  end
+end
+
 ---@param node DirectoryNode
 function Explorer:expand(node)
   self:_load(node)
@@ -375,9 +483,61 @@ function Explorer:reload_git()
   event_running = false
 end
 
+---Cursor position as per vim.api.nvim_win_get_cursor
+---nil on no explorer or invalid view win
+---@return integer[]|nil
+function Explorer:get_cursor_position()
+  local winnr = view.get_winnr()
+  if not winnr or not vim.api.nvim_win_is_valid(winnr) then
+    return
+  end
+
+  return vim.api.nvim_win_get_cursor(winnr)
+end
+
+---@return Node|nil
+function Explorer:get_node_at_cursor()
+  local cursor = self:get_cursor_position()
+  if not cursor then
+    return
+  end
+
+  if cursor[1] == 1 and view.is_root_folder_visible(core.get_cwd()) then
+    return self
+  end
+
+  return utils.get_nodes_by_line(self.nodes, core.get_nodes_starting_line())[cursor[1]]
+end
+
+function Explorer:place_cursor_on_node()
+  local ok, search = pcall(vim.fn.searchcount)
+  if ok and search and search.exact_match == 1 then
+    return
+  end
+
+  local node = self:get_node_at_cursor()
+  if not node or node.name == ".." then
+    return
+  end
+  node = node:get_parent_of_group() or node
+
+  local line = vim.api.nvim_get_current_line()
+  local cursor = vim.api.nvim_win_get_cursor(0)
+  local idx = vim.fn.stridx(line, node.name)
+
+  if idx >= 0 then
+    vim.api.nvim_win_set_cursor(0, { cursor[1], idx })
+  end
+end
+
+---Api.tree.get_nodes
+---@return Node
+function Explorer:get_nodes()
+  return self:clone()
+end
+
 function Explorer:setup(opts)
   config = opts
-  require("nvim-tree.explorer.watch").setup(opts)
 end
 
 return Explorer