Bram,
On Fr, 07 Mär 2014, Bram Moolenaar wrote:
>
> Christian Brabandt wrote:
>
> > here is a patch, containing an :undorecover command that has been
> > requested before. If you apply this patch and use :undorecover on
> > existing undofiles, it will simply read in the undo structure.
> >
> > But by itself this isn't really useful, as one probably ends up with
> > only many small pieces of the original file and most probably not the
> > complete file contents. But at least one can traverse the undo structure
> > and see if one can at least recover parts of the file.
> >
> > Newly written undofiles will therefore at least contain one complete
> > buffer content at the time the undofile is written and no complete
> > buffer content has been recorded yet. When using those undofiles
> > together with :undorecover one will jump to that state in the undo tree
> > and from there one can try to recover parts of the file.
> >
> > But even then, if one has many undo branches, there will be most likely
> > branches, that are not recoverable, because the undo information does
> > not contains information to recover from that initial state.
> >
> > Therefore, this patch also adds an 'undosavebuf' option (off by default)
> > which when on, will always save the complete buffer in the undo tree
> > whenever the undofile is written. This possibly makes the undo tree (and
> > undofile) a lot larger, but the user should be able to recover different
> > states pretty easily.
>
> Thanks. Setting that 'undosavebuf' sounds a bit dangerous...
>
> If I understand it correctly, the user will have to go forward and
> backward in the undo tree to find useful text. And there will be many
> versions of the same line. Perhaps it's possible to be more clever and
> just start with buffer with empty lines, and go through history in a way
> one ends up with the last known state of each line? I know this isn't
> easy, but it should be possible.
>
> Also, this is difficult to test with something under src/testdir. It's
> probably more suited for a unittest like memfile_test.c does.
Okay, I'll look into it.
Best,
Christian
--
Die Katholiken Terrorisieren das Land mit einer Auffassung vom Wesen
der Ehe, die die ihre ist und die uns nichts angeht.
-- Kurt Tucholsky
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