Am 02.11.20 um 07:53 schrieb Eli Barzilay:
> Is the following a bug?
>
> $ printf "aaa\nbbb\nccc\n\n" > 1
> $ printf "aaa\nbbb\n\nccc\n" > 2
> $ git diff --ignore-blank-lines 1 2
>
> This shows a weird output, as if `ccc` was removed and then re-added.
> Flipping the 1 & 2 names makes it show no difference at all. I tried
> a bunch of variants, including --minimal, and the four algorithms, and
> all show the same results. (Similar brokenness happens with an empty
> line at the beginning on one side and after the first line on the
> other.)
>
> I'm really not sure that the following is a bug, because I see the
> same behavior from `diff` (which is what made me try git-diff, hoping
> that it would be more consistent). (But I can't think of any rational
> that would make it not a bug.)
$ printf "aaa\nbbb\nccc\n\n" > 1
$ printf "aaa\nbbb\n\nccc\n" > 2
$ diff --ignore-blank-lines -u 1 2
--- 1 2020-11-02 18:11:04.618133008 +0100
+++ 2 2020-11-02 18:11:04.618133008 +0100
@@ -1,4 +1,4 @@
aaa
bbb
-ccc
+ccc
$ diff --ignore-blank-lines -u 2 1
This matches your results. That the order makes a difference is a bit
odd. Both are valid diffs of the inputs and neither one changes blank
lines, though, so it doesn't look like a bug.
$ git diff --ignore-blank-lines 1 2
$ git diff --ignore-blank-lines 2 1
$ git --version
git version 2.29.2
This matches your expectation, but not your results. Which version do
you use?
René
