Re: [RFC PATCH] Implement vc-git-annotate-show-diff-revision-at-line for emacs vc-git

From: Junio C Hamano <gitster@pobox.com>
Date: Feb 22, 2008, 20:51 UTC
Message-ID: <7vbq6890km.fsf@gitster.siamese.dyndns.org>
In-Reply-To: <1203706693.7552.56.camel@alexjb-desktop.transitives.com>

Alex Bennee <kernel-hacker@bennee.com> writes:

Show 5 quoted lines

> +(defun vc-git-annotate-extract-revision-at-line ()
> +  (save-excursion
> +    (move-beginning-of-line 1)
> +    (and (looking-at "[0-9a-f]+")
> +         (buffer-substring (match-beginning 0) (match-end 0)))))

Does this grab the commit object name from the annotation of a _full_ file? How is the annotation done? With "blame" without frills?

It may be interesting to run:

	git blame -w -n -f -C -- $path

which would give you the code movement (ignoring whitespace changes) across files, so that you can view where the line really originated from.

You can also throw in -L line range limiter like this:

	git blame -L$lineno-10,+20 -w -n -f -C -- $path

which would limit the output to lines around the current line, and that would be slightly less expensive than annotating the whole file, if you do this on-demand.

E.g.

	$ git blame -L48,+20 -w -n -f -C -- block/blk-exec.c

would give you something like:

    165125e1 block/ll_rw_blk.c         2585 (Jens Axboe       2007-07-2...
    f1970baf drivers/block/ll_rw_blk.c 2255 (James Bottomley  2005-06-2...
    8ffdc655 block/ll_rw_blk.c         2320 (Tejun Heo        2006-01-0...
    f1970baf drivers/block/ll_rw_blk.c 2257 (James Bottomley  2005-06-2...
    f1970baf drivers/block/ll_rw_blk.c 2258 (James Bottomley  2005-06-2...
    f1970baf drivers/block/ll_rw_blk.c 2259 (James Bottomley  2005-06-2...
    f1970baf drivers/block/ll_rw_blk.c 2260 (James Bottomley  2005-06-2...
    4aff5e23 block/ll_rw_blk.c         2530 (Jens Axboe       2006-08-1...
    f1970baf drivers/block/ll_rw_blk.c 2262 (James Bottomley  2005-06-2...
    4c5d0bbd block/ll_rw_blk.c         2480 (Andrew Morton    2006-03-2...
    4c5d0bbd block/ll_rw_blk.c         2481 (Andrew Morton    2006-03-2...
    4c5d0bbd block/ll_rw_blk.c         2482 (Andrew Morton    2006-03-2...
    4c5d0bbd block/ll_rw_blk.c         2483 (Andrew Morton    2006-03-2...
    4c5d0bbd block/ll_rw_blk.c         2484 (Andrew Morton    2006-03-2...
    f1970baf drivers/block/ll_rw_blk.c 2265 (James Bottomley  2005-06-2...
    6e39b69e block/ll_rw_blk.c         2309 (Mike Christie    2005-11-1...
    6e39b69e block/ll_rw_blk.c         2310 (Mike Christie    2005-11-1...
    637b48c8 drivers/block/ll_rw_blk.c 1872 (Jens Axboe       2004-03-1...
    637b48c8 drivers/block/ll_rw_blk.c 1873 (Jens Axboe       2004-03-1...
    637b48c8 drivers/block/ll_rw_blk.c 1874 (Jens Axboe       2004-03-1...