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1) Start Emacs
2) Open a patch file, it will open in a diff-mode
3) kill a hunk (Alt-K)

Example:

Let's have a patch with two subsequent hunks:

 curves =3D [
@@ -108,6 +117,9 @@ Hunk #2, a/tests/test_ec_curves.py curves =3D [
 #    ('ipsec4', 185),
 #]
=20
+
+@unittest.skipUnless(EC_Module_Available,
+                     'Requires EC modules compiled into OpenSSL')
 class ECCurveTests(unittest.TestCase):
     #data =3D sha.sha('Kilroy was here!').digest()     # 160 bits
     data =3D "digest"     # keep short (48 bits) so lesser curves=20
@@ -153,7 +165,8 @@ Hunk #3, a/tests/test_ec_curves.py def suite():
=20
[end of example]=20

When I am on line with @unittest.skipUnless and press Alt-K the result
is:

 curves =3D [
@@ -153,7 +165,8 @@ Hunk #3, a/tests/test_ec_curves.py def suite():

[end of example]=20

That's actually wrong. The original hunk added three lines to the new
file, so when it is killed, the new line number in the hunk header
should be decreased by three, so the line should be

@@ -153,7 +162,8 @@

Best,

Mat=C4=9Bj Cepl


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To: mcepl@HIDDEN (=?UTF-8?Q?Mat=C4=9Bj?= Cepl)
Subject: bug#15303: Acknowledgement (24.3; [diff-mode] diff-hunk-kill
 doesn't update numbers in subsequent hunks)
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Subject: bug#15303: 24.3; [diff-mode] diff-hunk-kill doesn't update numbers in subsequent hunks
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 Cepl"'s message of "Sat, 07 Sep 2013 22:01:47 +0200")
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> That's actually wrong.  The original hunk added three lines to the new
> file, so when it is killed, the new line number in the hunk header
> should be decreased by three, so the line should be

Indeed, currently, diff-mode does not try very hard (if at all) to keep
the line numbers correct, and instead presumes that the hunks will be
applied "fuzzily".

I might accept a patch which fixes this issue, but doing it right
(e.g. handle all the different kinds of hunks we support, disregard
subsequent hunks that apply to other files, ...) might prove too complex
for the benefit.

The problem also is that this presumes a particular use case (you get
a diff for file FOO, then you remove some of the hunks to extract
a sub-diff that will apply to the same file).

But there are other uses cases where the current behavior is "right".
E.g. I mainly use M-k in .rej files after I applied the corresponding
hunk by hand, in which case the subsequent hunks shouldn't be updated.
Admittedly, for a .rej file, the exact line numbers are often not quite
right, so it wouldn't make things worse to update subsequent hunks.


        Stefan




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On 09/09/2013 08:18 PM, Stefan Monnier wrote:
> I might accept a patch which fixes this issue, but doing it right
> (e.g. handle all the different kinds of hunks we support, disregard
> subsequent hunks that apply to other files, ...) might prove too comple=
x
> for the benefit.

I am afraid, I have no clue about Lisp at all (SICP is still lying on my
bed table, but I am afraid it is used mostly as sleeping pills ;)). I
have come to this problem while writing my own module for vim
(http://gitorious.org/vim-diff_navigator/).

> The problem also is that this presumes a particular use case (you get
> a diff for file FOO, then you remove some of the hunks to extract
> a sub-diff that will apply to the same file).

While working with Fedora (and RHEL) packages I work a lot with patches,
and it is often much more easy to actually edit patches (which are of
course correct ones) than to apply all patches and regenerate patches.
And quilt doesn't help everytime completely.

And of course, we have --fuzz=3D0 everywhere in Fedora (and RHEL).

So, yes, I understand where you are coming from, but I have a bit
different use case.

> But there are other uses cases where the current behavior is "right".
> E.g. I mainly use M-k in .rej files after I applied the corresponding
> hunk by hand, in which case the subsequent hunks shouldn't be updated.
> Admittedly, for a .rej file, the exact line numbers are often not quite=

> right, so it wouldn't make things worse to update subsequent hunks.

OTOH, my script in the worst case doesn't make things worse.

Best,

Mat=C4=9Bj
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Subject: bug#15303: 24.3; [diff-mode] diff-hunk-kill doesn't update numbers in subsequent hunks
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severity 15303 wishlist
thanks

> I am afraid, I have no clue about Lisp at all (SICP is still lying on my
> bed table, but I am afraid it is used mostly as sleeping pills ;)).
> I have come to this problem while writing my own module for vim
> (http://gitorious.org/vim-diff_navigator/).

Sounds like the perfect opportunity to get up to speed on Lisp.

> While working with Fedora (and RHEL) packages I work a lot with patches,
> and it is often much more easy to actually edit patches (which are of
> course correct ones) than to apply all patches and regenerate patches.
> And quilt doesn't help everytime completely.
> And of course, we have --fuzz=0 everywhere in Fedora (and RHEL).
> So, yes, I understand where you are coming from, but I have a bit
> different use case.

I agree it would be generally good to update the numbers like you
request, but it's not a high-enough priority.


        Stefan




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Subject: bug#15303: 24.3; [diff-mode] diff-hunk-kill doesn't update numbers in subsequent hunks
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On 09/10/2013 01:08 AM, Stefan Monnier wrote:
> Sounds like the perfect opportunity to get up to speed on Lisp.

I was nice and I haven't said my thoughts about Emacs and Lisp, right? ;)=


Mat=C4=9Bj

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God is not worried about my financial situation.


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