[PATCH v1 1/3] range-diff: treat notes like `log`

From: Kristoffer Haugsbakk <code@khaugsbakk.name>
To: git@vger.kernel.org
Cc: Kristoffer Haugsbakk <code@khaugsbakk.name>,
	Jeff King <peff@peff.net>, Junio C Hamano <gitster@pobox.com>,
	Denton Liu <liu.denton@gmail.com>
Subject: [PATCH v1 1/3] range-diff: treat notes like `log`
Date: Sun, 11 Jun 2023 20:15:54 +0200	[thread overview]
Message-ID: <6a4fe606cfae91ac9d0a69fef772bc56a507ef7d.1686505920.git.code@khaugsbakk.name> (raw)
In-Reply-To: <cover.1686505920.git.code@khaugsbakk.name>

Currently, `range-diff` shows the default notes if no notes-related
arguments are given. This is also how `log` behaves. But unlike
`range-diff`, `log` does *not* show the default notes if
`--notes=<custom>` are given. In other words, this:

    git log --notes=custom

is equivalent to this:

    git log --no-notes --notes=custom

While:

    git range-diff --notes=custom

acts like this:

    git log --notes --notes-custom

This can’t be how the user expects `range-diff` to behave given that the
man page for `range diff` under `--[no-]notes[=<ref>]` says:

> This flag is passed to the git log program (see git-log(1)) that
> generates the patches.

This behavior also affects `format-patch` since it uses `range-diff` for
the cover letter. Unlike `log`, though, `format-patch` is not supposed
to show the default notes if no notes-related arguments are given.[1]
But this promise is broken when the range-diff happens to have something
to say about the changes to the default notes, since that will be shown
in the cover letter.

Remedy this by co-opting the `--standard-notes` option which has been
deprecated since ab18b2c0df[2] and which is currently only documented in
`pretty-options`.

† 1: See e.g. 66b2ed09c2 (Fix "log" family not to be too agressive about
    showing notes, 2010-01-20).
† 2: log/pretty-options: Document --[no-]notes and deprecate old notes
    options, 2011-03-30

Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
---
 range-diff.c          |  2 +-
 revision.c            |  7 +++++--
 t/t3206-range-diff.sh | 28 ++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/range-diff.c b/range-diff.c
index 6a704e6f47..2c92af337f 100644
--- a/range-diff.c
+++ b/range-diff.c
@@ -59,7 +59,7 @@ static int read_patches(const char *range, struct string_list *list,
 		     "--output-indicator-context=#",
 		     "--no-abbrev-commit",
 		     "--pretty=medium",
-		     "--notes",
+		     "--standard-notes",
 		     NULL);
 	strvec_push(&cp.args, range);
 	if (other_arg)
diff --git a/revision.c b/revision.c
index b33cc1d106..a0ab7fb784 100644
--- a/revision.c
+++ b/revision.c
@@ -2524,8 +2524,11 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
 		disable_display_notes(&revs->notes_opt, &revs->show_notes);
 		revs->show_notes_given = 1;
 	} else if (!strcmp(arg, "--standard-notes")) {
-		revs->show_notes_given = 1;
-		revs->notes_opt.use_default_notes = 1;
+		disable_display_notes(&revs->notes_opt, &revs->show_notes);
+		revs->show_notes_given = 0;
+		enable_default_display_notes(&revs->notes_opt,
+					     &revs->show_notes);
+		revs->notes_opt.use_default_notes = -1;
 	} else if (!strcmp(arg, "--no-standard-notes")) {
 		revs->notes_opt.use_default_notes = 0;
 	} else if (!strcmp(arg, "--oneline")) {
diff --git a/t/t3206-range-diff.sh b/t/t3206-range-diff.sh
index b5f4d6a653..b33afa1c6a 100755
--- a/t/t3206-range-diff.sh
+++ b/t/t3206-range-diff.sh
@@ -662,6 +662,20 @@ test_expect_success 'range-diff with multiple --notes' '
 	test_cmp expect actual
 '
 
+# `range-diff` should act like `log` with regards to notes
+test_expect_success 'range-diff with --notes=custom does not show default notes' '
+	git notes add -m "topic note" topic &&
+	git notes add -m "unmodified note" unmodified &&
+	git notes --ref=custom add -m "topic note" topic &&
+	git notes --ref=custom add -m "unmodified note" unmodified &&
+	test_when_finished git notes remove topic unmodified &&
+	test_when_finished git notes --ref=custom remove topic unmodified &&
+	git range-diff --notes=custom main..topic main..unmodified \
+		>actual &&
+	! grep "## Notes ##" actual &&
+	grep "## Notes (custom) ##" actual
+'
+
 test_expect_success 'format-patch --range-diff does not compare notes by default' '
 	git notes add -m "topic note" topic &&
 	git notes add -m "unmodified note" unmodified &&
@@ -679,6 +693,20 @@ test_expect_success 'format-patch --range-diff does not compare notes by default
 	! grep "note" 0000-*
 '
 
+test_expect_success 'format-patch --notes=custom --range-diff only compares custom notes' '
+	git notes add -m "topic note" topic &&
+	git notes --ref=custom add -m "topic note (custom)" topic &&
+	git notes add -m "unmodified note" unmodified &&
+	git notes --ref=custom add -m "unmodified note (custom)" unmodified &&
+	test_when_finished git notes remove topic unmodified &&
+	test_when_finished git notes --ref=custom remove topic unmodified &&
+	git format-patch --notes=custom --cover-letter --range-diff=$prev \
+		main..unmodified >actual &&
+	test_when_finished "rm 000?-*" &&
+	grep "## Notes (custom) ##" 0000-* &&
+	! grep "## Notes ##" 0000-*
+'
+
 test_expect_success 'format-patch --range-diff with --no-notes' '
 	git notes add -m "topic note" topic &&
 	git notes add -m "unmodified note" unmodified &&
-- 
2.41.0

