feat(command): add source last refers to the last executed source

README.md

@@ -482,6 +482,7 @@ What to show. Can be one of:
 | filesystem | Show a file browser. DEFAULT |
 | buffers    | Show a list of currently open buffers. |
 | git_status | Show the output of `git status` in a tree layout. |
+| last       | Equivalent to the last source used |
 
 #### `position`
 Where to show it, can be one of:

lua/neo-tree/command/init.lua

@@ -11,6 +11,12 @@ local M = {
   complete_args = completion.complete_args,
 }
 
+-- Store the last source used for `M.execute`
+M._last = {
+  source = nil,
+  position = nil,
+}
+
 ---Executes a Neo-tree action from outside of a Neo-tree window,
 ---such as show, hide, navigate, etc.
 ---@param args table The action to execute. The table can have the following keys:
@@ -61,6 +67,23 @@ M.execute = function(args)
   -- The rest of the actions require a source
   args.source = args.source or nt.config.default_source
 
+  -- Handle source=last
+  if args.source == "last" then
+    args.source = M._last.source or nt.config.default_source
+
+    -- Restore last position if it was not specified
+    if args.position == nil then
+      args.position = M._last.position
+    end
+
+    -- Prevent the default source from being set to "last"
+    if args.source == "last" then
+      args.source = nt.config.sources[1]
+    end
+  end
+  M._last.source = args.source
+  M._last.position = args.position
+
   -- If position=current was requested, but we are currently in a neo-tree window,
   -- then we need to override that.
   if args.position == "current" and vim.bo.filetype == "neo-tree" then

lua/neo-tree/command/parser.lua

@@ -11,6 +11,9 @@ M.setup = function(all_source_names)
   local source_names = utils.table_copy(all_source_names)
   table.insert(source_names, "migrations")
 
+  -- A special source referring to the last used source.
+  table.insert(source_names, "last")
+
   -- For lists, the first value is the default value.
   local arguments = {
     action = {

lua/neo-tree/defaults.lua

@@ -15,7 +15,7 @@ local config = {
   -- popup_border_style is for input and confirmation dialogs.
   -- Configurtaion of floating window is done in the individual source sections.
   -- "NC" is a special style that works well with NormalNC set
-  default_source = "filesystem",
+  default_source = "filesystem", -- you can choose a specific source `last` here which indicates the last used source
   enable_diagnostics = true,
   enable_git_status = true,
   enable_modified_markers = true, -- Show markers for files with unsaved changes.

lua/neo-tree/setup/init.lua

@@ -642,7 +642,7 @@ M.merge_config = function(user_config, is_auto_config)
         break
       end
   end
-  if not match then
+  if not match and M.config.default_source ~= "last" then
     M.config.default_source = M.config.sources[1]
     log.warn(string.format("Invalid default source found in configuration. Using first available source: %s", M.config.default_source))
   end