feat: add sort_by option to sort files by modification time (#1040)

Co-authored-by: Brandon Dwiel <bdwiel@apple.com>

lua/nvim-tree/explorer/utils.lua

@@ -5,9 +5,10 @@ local utils = require'nvim-tree.utils'
 local M = {
   ignore_list = {},
   exclude_list = {},
+  node_comparator = nil,
 }
 
-function M.node_comparator(a, b)
+function M.node_comparator_name(a, b)
   if not (a and b) then
     return true
   end
@@ -20,6 +21,19 @@ function M.node_comparator(a, b)
   return a.name:lower() <= b.name:lower()
 end
 
+function M.node_comparator_modification_time(a, b)
+  if not (a and b) then
+    return true
+  end
+  if a.nodes and not b.nodes then
+    return true
+  elseif not a.nodes and b.nodes then
+    return false
+  end
+
+  return b.last_modified <= a.last_modified
+end
+
 ---Check if the given path should be ignored.
 ---@param path string Absolute path
 ---@return boolean
@@ -73,6 +87,7 @@ function M.setup(opts)
     filter_ignored = true,
     filter_dotfiles = opts.filters.dotfiles,
     filter_git_ignored = opts.git.ignore,
+    sort_by = opts.sort_by,
   }
 
   M.exclude_list = opts.filters.exclude
@@ -83,6 +98,12 @@ function M.setup(opts)
       M.ignore_list[filter_name] = true
     end
   end
+
+  if M.config.sort_by == "modification_time" then
+    M.node_comparator = M.node_comparator_modification_time
+  else
+    M.node_comparator = M.node_comparator_name
+  end
 end
 
 return M