Re: [PATCH v3 3/4] add-patch: respect diff.context configuration

[Phillip Wood <phillip.wood123@xxxxxxxxx>]

Hi Leon

On 28/06/2025 17:34, Leon Michalak via GitGitGadget wrote:
> From: Leon Michalak <leonmichalak6@xxxxxxxxx>
>
> Various builtins that use add-patch infrastructure do not respect
> the user's diff.context and diff.interHunkContext file configurations.
> This patch fixes this inconsistency.
>
> This is because the plumbing commands used by "git add -p" to generate
> the diff do not read those config settings. Fix this by reading the
> config before generating the patch and passing it along to the diff
> command with the "-U" and "--inter-hunk-context" command-line options.

This looks good to me, thanks for working on it

Phillip

> Signed-off-by: Leon Michalak <leonmichalak6@xxxxxxxxx>
> ---
>   add-interactive.c          | 17 +++++++++++++++++
>   add-interactive.h          |  1 +
>   add-patch.c                |  6 ++++++
>   t/t3701-add-interactive.sh | 22 ++++++++++++++++++++++
>   4 files changed, 46 insertions(+)
>
> diff --git a/add-interactive.c b/add-interactive.c
> index 97ff35b6f12a..e0aafb8dd02a 100644
> --- a/add-interactive.c
> +++ b/add-interactive.c
> @@ -39,8 +39,12 @@ static void init_color(struct repository *r, struct add_i_state *s,
>   void init_add_i_state(struct add_i_state *s, struct repository *r)
>   {
>   	const char *value;
> +	int context;
> +	int interhunkcontext;
>   
>   	s->r = r;
> +	s->context = -1;
> +	s->interhunkcontext = -1;
>   
>   	if (repo_config_get_value(r, "color.interactive", &value))
>   		s->use_color = -1;
> @@ -78,6 +82,19 @@ void init_add_i_state(struct add_i_state *s, struct repository *r)
>   	repo_config_get_string(r, "diff.algorithm",
>   			       &s->interactive_diff_algorithm);
>   
> +	if (!repo_config_get_int(r, "diff.context", &context)) {
> +		if (context < 0)
> +			die(_("%s cannot be negative"), "diff.context");
> +		else
> +			s->context = context;
> +	}
> +	if (!repo_config_get_int(r, "diff.interHunkContext", &interhunkcontext)) {
> +		if (interhunkcontext < 0)
> +			die(_("%s cannot be negative"), "diff.interHunkContext");
> +		else
> +			s->interhunkcontext = interhunkcontext;
> +	}
> +
>   	repo_config_get_bool(r, "interactive.singlekey", &s->use_single_key);
>   	if (s->use_single_key)
>   		setbuf(stdin, NULL);
> diff --git a/add-interactive.h b/add-interactive.h
> index 693f125e8e4b..c63f35b14be8 100644
> --- a/add-interactive.h
> +++ b/add-interactive.h
> @@ -18,6 +18,7 @@ struct add_i_state {
>   
>   	int use_single_key;
>   	char *interactive_diff_filter, *interactive_diff_algorithm;
> +	int context, interhunkcontext;
>   };
>   
>   void init_add_i_state(struct add_i_state *s, struct repository *r);
> diff --git a/add-patch.c b/add-patch.c
> index 95c67d8c80c4..b43ca1600738 100644
> --- a/add-patch.c
> +++ b/add-patch.c
> @@ -415,6 +415,8 @@ static int parse_diff(struct add_p_state *s, const struct pathspec *ps)
>   {
>   	struct strvec args = STRVEC_INIT;
>   	const char *diff_algorithm = s->s.interactive_diff_algorithm;
> +	int diff_context = s->s.context;
> +	int diff_interhunkcontext = s->s.interhunkcontext;
>   	struct strbuf *plain = &s->plain, *colored = NULL;
>   	struct child_process cp = CHILD_PROCESS_INIT;
>   	char *p, *pend, *colored_p = NULL, *colored_pend = NULL, marker = '\0';
> @@ -424,6 +426,10 @@ static int parse_diff(struct add_p_state *s, const struct pathspec *ps)
>   	int res;
>   
>   	strvec_pushv(&args, s->mode->diff_cmd);
> +	if (diff_context != -1)
> +		strvec_pushf(&args, "--unified=%i", diff_context);
> +	if (diff_interhunkcontext != -1)
> +		strvec_pushf(&args, "--inter-hunk-context=%i", diff_interhunkcontext);
>   	if (diff_algorithm)
>   		strvec_pushf(&args, "--diff-algorithm=%s", diff_algorithm);
>   	if (s->revision) {
> diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
> index b088ee141ff4..18dc329ea1f6 100755
> --- a/t/t3701-add-interactive.sh
> +++ b/t/t3701-add-interactive.sh
> @@ -1230,4 +1230,26 @@ test_expect_success 'hunk splitting works with diff.suppressBlankEmpty' '
>   	test_cmp expect actual
>   '
>   
> +test_expect_success 'add -p respects diff.context' '
> +	test_write_lines a b c d e f g h i j k l m >file &&
> +	git add file &&
> +	test_write_lines a b c d e f G h i j k l m >file &&
> +	echo y | git -c diff.context=5 add -p >actual &&
> +	test_grep "@@ -2,11 +2,11 @@" actual
> +'
> +
> +test_expect_success 'add -p respects diff.interHunkContext' '
> +	test_write_lines a b c d e f g h i j k l m n o p q r s >file &&
> +	git add file &&
> +	test_write_lines a b c d E f g i i j k l m N o p q r s >file &&
> +	echo y | git -c diff.interhunkcontext=2 add -p >actual &&
> +	test_grep "@@ -2,16 +2,16 @@" actual
> +'
> +
> +test_expect_success 'add -p rejects negative diff.context' '
> +	test_config diff.context -1 &&
> +	test_must_fail git add -p 2>output &&
> +	test_grep "diff.context cannot be negative" output
> +'
> +
>   test_done