Undo functionality about visidata HOT 2 CLOSED

Implemented as of v0.59.

from visidata.

What I'm planning for this, is to have an editlog that tracks all edits and transforms in such a way that they can be replayed on top of the source sheet (the same one or a similarly structured one with different data). Then you could jump to the editlog sheet (M for modifications, or T for transformations? E is currently 'errorlog' but maybe that should move to ^E) and:

• change or delete any edits manually
• push a new sheet with current/selected/all edits applied to the same or different source sheet
• ^Save the editlog for later reuse.
• ^Reload on the source sheet re-applies the editlog

So undo would be a simple command:

command('u', 'editlog.rows.pop(); reload()', 'undo last edit')

or Mgjdq^R

if done manually.

This would also allow for a tight test framework, with source + editlog + golden output being a complete functional test.

A possible problem is that undo might take a long time with a lot of edits or a large dataset. But I feel like that should be dealt with in a different way.

What do you think about this approach?

from visidata.