Move dir_up functionality into lib and make '-' a default keymap for it

lua/lib/config.lua

@@ -70,6 +70,7 @@ function M.get_bindings()
     paste           = keybindings.paste or 'p',
     prev_git_item   = keybindings.prev_git_item or '[c',
     next_git_item   = keybindings.next_git_item or ']c',
+    dir_up          = keybindings.dir_up or '-',
   }
 end
 

lua/lib/lib.lua

@@ -252,6 +252,7 @@ local function set_mappings()
     [bindings.paste] = 'on_keypress("paste")';
     [bindings.prev_git_item] = 'on_keypress("prev_git_item")';
     [bindings.next_git_item] = 'on_keypress("next_git_item")';
+    [bindings.dir_up] = 'on_keypress("dir_up")';
     gx = "xdg_open()";
   }
 
@@ -366,4 +367,16 @@ function M.toggle_dotfiles()
   return M.refresh_tree()
 end
 
+function M.dir_up(node)
+  if not node then
+    return M.change_dir('..')
+  else
+    local newdir = vim.fn.fnamemodify(node.absolute_path, ':h')
+    if newdir == M.Tree.cwd then
+      M.change_dir('..')
+    end
+    return M.set_index_and_redraw(newdir)
+  end
+end
+
 return M

lua/nvim-tree.lua

@@ -73,6 +73,7 @@ local keypress_funcs = {
   refresh = lib.refresh_tree,
   prev_git_item = gen_go_to('prev_git_item'),
   next_git_item = gen_go_to('next_git_item'),
+  dir_up = lib.dir_up,
   preview = function(node)
     if node.entries ~= nil or node.name == '..' then return end
     return lib.open_file('preview', node.absolute_path)
@@ -105,19 +106,6 @@ function M.on_keypress(mode)
   end
 end
 
-function M.dir_up()
-    local node = lib.get_node_at_cursor()
-    if not node then
-        return lib.change_dir('..')
-    else
-        local newdir = vim.fn.fnamemodify(node.absolute_path, ':h')
-        if newdir == lib.Tree.cwd then
-            lib.change_dir('..')
-        end
-        lib.set_index_and_redraw(newdir)
-    end
-end
-
 function M.refresh()
   lib.refresh_tree()
 end