refacto: split explorer module into multiple files

lua/nvim-tree/explorer/utils.lua

@@ -0,0 +1,100 @@
+local uv = vim.loop
+local utils = require'nvim-tree.utils'
+
+local M = {
+  ignore_list = {},
+  exclude_list = {},
+}
+
+-- Returns true if there is either exactly 1 dir, or exactly 1 symlink dir. Otherwise, false.
+-- @param cwd Absolute path to the parent directory
+-- @param dirs List of dir names
+-- @param files List of file names
+-- @param links List of symlink names
+function M.should_group(cwd, dirs, files, links)
+  if #dirs == 1 and #files == 0 and #links == 0 then
+    return true
+  end
+
+  if #dirs == 0 and #files == 0 and #links == 1 then
+    local absolute_path = utils.path_join({ cwd, links[1] })
+    local link_to = uv.fs_realpath(absolute_path)
+    return (link_to ~= nil) and uv.fs_stat(link_to).type == 'directory'
+  end
+
+  return false
+end
+
+function M.node_comparator(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 a.name:lower() <= b.name:lower()
+end
+
+---Check if the given path should be ignored.
+---@param path string Absolute path
+---@return boolean
+function M.should_ignore(path)
+  local basename = utils.path_basename(path)
+
+  for _, node in ipairs(M.exclude_list) do
+    if path:match(node) then
+      return false
+    end
+  end
+
+  if M.config.filter_dotfiles then
+    if basename:sub(1, 1) == '.' then
+      return true
+    end
+  end
+
+  if not M.config.filter_ignored then
+    return false
+  end
+
+  local relpath = utils.path_relative(path, vim.loop.cwd())
+  if M.ignore_list[relpath] == true or M.ignore_list[basename] == true then
+    return true
+  end
+
+  local idx = path:match(".+()%.[^.]+$")
+  if idx then
+    if M.ignore_list['*'..string.sub(path, idx)] == true then
+      return true
+    end
+  end
+
+  return false
+end
+
+function M.should_ignore_git(path, status)
+  return M.config.filter_ignored
+    and (M.config.filter_git_ignored and status and status[path] == '!!')
+end
+
+function M.setup(opts)
+  M.config = {
+    filter_ignored = true,
+    filter_dotfiles = opts.filters.dotfiles,
+    filter_git_ignored = opts.git.ignore,
+  }
+
+  M.exclude_list = opts.filters.exclude
+
+  local custom_filter = opts.filters.custom
+  if custom_filter and #custom_filter > 0 then
+    for _, filter_name in pairs(custom_filter) do
+      M.ignore_list[filter_name] = true
+    end
+  end
+end
+
+return M