Re: git rev-list -S ?

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On Tue, Mar 20, 2012 at 01:53:14PM -0700, Junio C Hamano wrote:

> |    $ git log -S'it drives an external
> |   an external' master Documentation/RelNotes
> 
> is a way to find commits that introduced and then removed the block of
> text to files in the named directory, starting at the tip of 'master'.
> 
> Most of the "ultimate tracking tool" dream has already been realized in
> "git blame" except one major part.  Once you find where the blame lies,
> the tool _could_ help the user to find where these blamed lines came from
> more than it currently does.  Were they typed anew?  Were similar lines
> removed by the commit from other files?  Often people run "blame" on a
> line range they are interested in, find the commits that were blamed, look
> at "git show $the_found_commit" to see if they can find similar lines in
> deleted parts of other files and then finally run blame again on the
> deleted line range of these other files starting from the parent commit of
> the found commit to do this (and this needs to be repeated).  A good GUI
> should be able to help this process quite a lot, if backed by a good logic
> to detect "similar" code blocks.

Related to this is the line-level history browser project. The idea was
basically to get a log-like view (i.e., reverse chronological commits)
of a chunk of code, tracing the ancestry of a particular chunk of lines.

This was done by Bo Yang as a GSoC project in 2010, but the code still
hasn't been merged. As I recall, it mostly works, but there are perhaps
some corner cases or ugly parts of the code still to be re-worked.
Thomas Rast was cleaning it up some, and could say more on the current
state.

-Peff
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