Re: qgit: Annotate hundreds of files at terrific speed ;-)

From: Marco Costalba <mcostalba@gmail.com>
Date: Jun 25, 2007, 11:20 UTC
Message-ID: <e5bfff550706250420s603e36eds9a2bcbb339aac80e@mail.gmail.com>
In-Reply-To: <200706250638.l5P6crkS026564@mi1.bluebottle.com>

On 6/25/07, Nanako Shiraishi <nanako3@bluebottle.com> wrote:

Show 10 quoted lines

>
> >> Marco Costalba <mcostalba@gmail.com> wrote:
> >
> > - filtering, ie selecting with the mouse some lines and getting a
> > subset of the file history that modified at least one of that lines is
> > not possible.
>
> I often use "git blame -L'/regexp/,/regexp/'" (you can use line
> numbers there, too).  Is this different from what you talk above?
>

Yes it.

Suppose you have selected file lines from 20 to 23 in revision A.

Revision history it's the following, in cronological order:

A (oldest) -> B - > C (newest)

Say that in revision B the patch removed 5 lines from 5 to 10 and added 2 new lines instead.

Now when you jump from A to revision C you may want to see selected the lines (-5 + 2 = -3) from 17 to 20 and no more the lines from 20 to 23 that will point to a different content.

In a general case jumping from a revision A to a revision N you have to:

- get the list of intermediate revision

- for each revision calculate deleted/ added content that is before
the selected lines range.

- for each revision calculate deleted/ added content that CROSSES the
selected range, so that if in our example revision B adds also 2 new
lines in position 21 the selection in C will not be 17 to 20 but 17 to
22!  The same logic in case of deleted lines in selected range.

So to keep a "consistent" mouse selection when jumping to different file revisions you really need to know all the annotate history in between.

Marco