i3-save-tree - save (parts of) the layout tree for restoring
i3-save-tree [--workspace=name|number] [--output=name]
The append_layout command will create placeholder windows, arranged in the layout the input file specifies. Each container should have a swallows specification. When a window is mapped (made visible on the screen) that matches the specification, i3 will put it into that place and kill the placeholder.
If neither argument is specified, the currently focused workspace will be used.
This program is free software; you can redistribute it and/or modify it under the terms of the BSD license.