Re: [GSOC PATCH v3] commit: avoid scanning trailing comments when 'core.commentChar' is "auto"

[Phillip Wood <phillip.wood123@xxxxxxxxx>]

Hi Ayush

On 30/06/2025 19:25, Ayush Chandekar wrote:
> Range-diff with v2:
> 1:  4e74e7a9a6 ! 1:  693f890a36 commit: avoid scanning trailing comments when 'core.commentChar' is "auto"
>      @@ Commit message
>       
>           The "auto" value for core.commentchar was introduced in the commit
>           84c9dc2c5a (commit: allow core.commentChar=auto for character auto
>      -    selection, 2014-05-17) but did not exhibt this issue at that time.
>      +    selection, 2014-05-17) but did not exhibit this issue at that time.
>       
>           The bug was introduced in commit a6c2654f83 (rebase -m: fix --signoff
>           with conflicts, 2024-04-18) where Git started writing conflict comments
>      @@ t/t3418-rebase-continue.sh: test_expect_success 'there is no --no-reschedule-fai
>        '
>        
>       +test_expect_success 'no change in comment character due to conflicts markers with core.commentChar=auto' '
>      -+	test_commit base file &&
>       +	git checkout -b branch-a &&
>      -+	test_commit A file &&
>      -+	git checkout -b branch-b base &&
>      -+	test_commit B file &&
>      ++	test_commit A F1 &&
>      ++	git checkout -b branch-b HEAD^ &&
>      ++	test_commit B F1 &&
>       +	test_must_fail git rebase branch-a &&
>      -+	printf "B\nA\n" >file &&
>      -+	git add file &&
>      ++	printf "B\nA\n" >F1 &&
>      ++	git add F1 &&
>       +	GIT_EDITOR="cat >actual" git -c core.commentChar=auto rebase --continue &&
>       +	# Check that "#" is still the comment character.
>      -+	test_grep "^# Changes to be committed:$" actual
>      ++	test_grep "^# Changes to be committed" actual
>       +'
>       +
>        test_orig_head_helper () {

The changes here look good but I think we want to update the config 
parsing as well so that comment_line_str is reset to '#' when 
core.commentString=auto. We probably want to do that in its own commit.

Thanks

Phillip