we_undo/README.md

## Usage

* `//undo` undo the latest worldedit command
* `//redo` redo what was just undone
* `//show_journal` view what can be undone and redone
* With the [more_chatcommands](https://github.com/red-001/more_chatcommands)
  mod, other player's changes can be undone with `/run_as <playername> //undo`,
  where `<playername>` is the other player's name.

Undoing reverts changes of nodes (name, param1 and param2) and metadata.
Node timers are not yet supported.
The undo functionality should help against accidents;
however, it should not be considered reliable since there is no guarantee that
undoing always is possible or works correctly.

The changes of nodes after invoking a command such as /set are compressed to
improve memory usage.


## Related issues:

* https://github.com/Uberi/Minetest-WorldEdit/issues/43
* https://forum.minetest.net/viewtopic.php?p=296543#p296543


## Implemented and missing Worldedit commands

#### Supported chatcommands

* /pos1 and /1
* /pos2 and /2
* /p
* /set and /s
* /mix
* /replace and /r
* /replaceinverse and /ri
* /orient
* /flip
* /cube and /hollowcube
* /sphere and /spr
* /hollowsphere and /hspr
* /dome and /do
* /hollowdome and /hdo
* /cylinder and /cyl
* /hollowcylinder and /hcyl
* /pyramid and /pyr
* /hollowpyramid and /hpyr
* /spiral
* /load
* /mtschemplace
* /luatransform (nodes and metadata changes inside the selected area)
* /y
* /n


#### Ignored chatcommands

* /lua
* /clearobjects
* /fixlight
* /save
* /mtschemcreate
* /mtschemprob
* /hide
* /suppress
* /highlight
* /restore
* /inspect /i
* /mark /mk
* /unmark /umk
* /volume and /v
* /about


#### Not yet implemented

* /fixedpos /fp
* /reset /rst
* /shift
* /expand
* /contract
* /outset
* /inset
* /copy
* /move
* /stack
* /stack2
* /drain
* /allocate
* /deleteblocks


#### Partly implemented

* /transpose (the marker position change is not saved)
* /rotate (the marker position change is not saved)
* /stretch (the marker position change is not saved)



## TODO

* Allow undoing changes which happened before other changes (considered unsafe)
	e.g. //undo ~1 to undo the change before the latest one
* Add code for more of the WorldEdit chat commands (see the lists above)
* Add a verbose option to the //show_journal output to show detailed information
  such as the UTC time when the changes happened and the required memory to
  store them