CLI undo edit?

[Derek Atkins]

Neil Williams <linux at codehelp.co.uk> writes:

> For now, I'm afraid, I have to step back and keep to what I can realistically 
> hope to complete.

Oh, that's fine.  I honestly didn't expect Undo in the near term.
Besides, we don't quite have SQL done, yet, so it's not a major deal
to me.  :)

I think "undo" will be much more important once we get SQL, but it's
not AS important now.

Also, I think the right way to go about it is not a list of changed
entities, but a list of events/operations.  Then you can undo/redo per
operation.  Each operation can have a list of changed entities.
Therefore, an "import" is a single operation (so it's a single
undo/redo entry in the undo/list) but it can have as many entries as
necessary in the changed-entries list.

Something like this:

  |
  |
 Import - [obj1, obj2, obj3, obj4, obj4]
  |
 New
 Acct  -- [ acct ]
  |
 New
 Txn   -- [ txn ]
  |
 Mod
 Txn   -- [ txn ]
  |
  |

Please don't feel inadiquate; you've done a tremendous amount of work.
Undo/Redo is a HARD problem in general unless we have the framework in
place to support it.  Unfortunately I suspect that framework will
require changes to QOF, but we'll have to see.

I don't expect this anytime soon; I'd much rather see g2 get done and
out the door first ;)

-derek
-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
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