On Tue, Jan 17, 2017 at 11:24:02PM -0600, Edmundo Carmona Antoranz wrote:
> For a very long time I had wanted to get the output of diff to include
> blame information as well (to see when something was added/removed).
This is something I've wanted, too. The trickiest part, though, is
blaming deletions, because git-blame only tracks the origin of content,
not the origin of a change.
For example, try this case:
git init
for i in $(seq 1 10); do
echo $i >>file
git add file
git commit -m "add $i"
done
sed 4d <file >tmp && mv tmp file
git commit -am "drop 4"
Running "difflame HEAD~5 HEAD" produces this output:
diff --git a/file b/file
index b414108..051c298 100644
--- a/file
+++ b/file
@@ -1,6 +1,9 @@
^2b028ff (Jeff King 2017-01-27 22:44:10 -0500 1) 1
ed056366 (Jeff King 2017-01-27 22:44:10 -0500 2) 2
771030d8 (Jeff King 2017-01-27 22:44:10 -0500 3) 3
-89c09c82 (Jeff King 2017-01-27 22:44:10 -0500 4) 4
b619039c (Jeff King 2017-01-27 22:44:10 -0500 4) 5
6a7aa0e5 (Jeff King 2017-01-27 22:44:10 -0500 5) 6
+39bc9dc4 (Jeff King 2017-01-27 22:44:10 -0500 6) 7
+f253cc8f (Jeff King 2017-01-27 22:44:10 -0500 7) 8
+85c10f46 (Jeff King 2017-01-27 22:44:10 -0500 8) 9
+89c09c82 (Jeff King 2017-01-27 22:44:10 -0500 9) 10
The last 4 lines are right; they correspond to the addition commits. But
the line taking away 4 is wrong. You can see even without looking at its
patch, because it is blamed to the same commit that added "10", which
is wrong.
Sorry I don't have a solution. I think it's an open problem with
git-blame, though you could probably script something around "git blame
--reverse". See the commit message of 85af7929e (git-blame --reverse,
2008-04-02) for some discussion.
-Peff
