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From: Denton Liu <liu.denton@gmail.com>
To: Git Mailing List <git@vger.kernel.org>
Cc: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Junio C Hamano" <gitster@pobox.com>,
	"Eric Sunshine" <sunshine@sunshineco.com>
Subject: [PATCH v2 4/4] format-patch: learn --infer-cover-letter option
Date: Mon, 19 Aug 2019 19:52:53 -0400
Message-ID: <e682bd347a09d0e1293ec6bd495c38dac5006a19.1566258525.git.liu.denton@gmail.com> (raw)
In-Reply-To: <cover.1566258525.git.liu.denton@gmail.com>

We used to populate the subject of the cover letter generated by
git-format-patch with "*** SUBJECT HERE ***". However, if a user submits
multiple patchsets, they may want to keep a consistent subject between
rerolls.

If git-format-patch is run with `--infer-cover-letter` or
`format.inferCoverSubject`, infer the subject for the cover letter from
the top line(s) of a branch description, similar to how a subject is
read from a commit message.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
---
 Documentation/config/format.txt    |  4 +++
 Documentation/git-format-patch.txt | 10 ++++++
 builtin/log.c                      | 56 +++++++++++++++++++-----------
 t/t4014-format-patch.sh            | 33 ++++++++++++++++++
 4 files changed, 82 insertions(+), 21 deletions(-)

diff --git a/Documentation/config/format.txt b/Documentation/config/format.txt
index 60e4e92885..9cd6a64e3e 100644
--- a/Documentation/config/format.txt
+++ b/Documentation/config/format.txt
@@ -36,6 +36,10 @@ format.subjectPrefix::
 	The default for format-patch is to output files with the '[PATCH]'
 	subject prefix. Use this variable to change that prefix.
 
+format.inferCoverSubject::
+	A boolean value which lets you enable the
+	`--infer-cover-subject` option of format-patch by default.
+
 format.signature::
 	The default for format-patch is to output a signature containing
 	the Git version number. Use this variable to change that default.
diff --git a/Documentation/git-format-patch.txt b/Documentation/git-format-patch.txt
index 95bc4d53ca..00ccfb51e7 100644
--- a/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@ -19,6 +19,7 @@ SYNOPSIS
 		   [--start-number <n>] [--numbered-files]
 		   [--in-reply-to=<Message-Id>] [--suffix=.<sfx>]
 		   [--ignore-if-in-upstream]
+		   [--[no-]infer-cover-subject]
 		   [--rfc] [--subject-prefix=<Subject-Prefix>]
 		   [(--reroll-count|-v) <n>]
 		   [--to=<email>] [--cc=<email>]
@@ -171,6 +172,14 @@ will want to ensure that threading is disabled for `git send-email`.
 	patches being generated, and any patch that matches is
 	ignored.
 
+--[no-]infer-cover-subject::
+	Instead of using the default "*** SUBJECT HERE ***" subject for
+	the cover letter, infer the subject from the branch's
+	description.
++
+Similar to a commit message, the subject is inferred as the beginning of
+the description up to and excluding the first blank line.
+
 --subject-prefix=<Subject-Prefix>::
 	Instead of the standard '[PATCH]' prefix in the subject
 	line, instead use '[<Subject-Prefix>]'. This
@@ -347,6 +356,7 @@ with configuration variables.
 	signOff = true
 	outputDirectory = <directory>
 	coverLetter = auto
+	inferCoverSubject = true
 ------------
 
 
diff --git a/builtin/log.c b/builtin/log.c
index 44b10b3415..b15754e282 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -774,6 +774,7 @@ static const char *signature = git_version_string;
 static const char *signature_file;
 static int config_cover_letter;
 static const char *config_output_directory;
+static int infer_cover_subject;
 
 enum {
 	COVER_UNSET,
@@ -887,6 +888,10 @@ static int git_format_config(const char *var, const char *value, void *cb)
 		}
 		return 0;
 	}
+	if (!strcmp(var, "format.infercoversubject")) {
+		infer_cover_subject = git_config_bool(var, value);
+		return 0;
+	}
 
 	return git_log_config(var, value, cb);
 }
@@ -993,20 +998,6 @@ static void print_signature(FILE *file)
 	putc('\n', file);
 }
 
-static void add_branch_description(struct strbuf *buf, const char *branch_name)
-{
-	struct strbuf desc = STRBUF_INIT;
-	if (!branch_name || !*branch_name)
-		return;
-	read_branch_desc(&desc, branch_name);
-	if (desc.len) {
-		strbuf_addch(buf, '\n');
-		strbuf_addbuf(buf, &desc);
-		strbuf_addch(buf, '\n');
-	}
-	strbuf_release(&desc);
-}
-
 static char *find_branch_name(struct rev_info *rev)
 {
 	int i, positive = -1;
@@ -1057,13 +1048,17 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
 			      struct commit *origin,
 			      int nr, struct commit **list,
 			      const char *branch_name,
+			      int infer_subject,
 			      int quiet)
 {
 	const char *committer;
-	const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
-	const char *msg;
+	const char *subject = "*** SUBJECT HERE ***";
+	const char *body = "*** BLURB HERE ***";
+	const char *description = NULL;
 	struct shortlog log;
 	struct strbuf sb = STRBUF_INIT;
+	struct strbuf description_sb = STRBUF_INIT;
+	struct strbuf subject_sb = STRBUF_INIT;
 	int i;
 	const char *encoding = "UTF-8";
 	int need_8bit_cte = 0;
@@ -1091,17 +1086,34 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
 	if (!branch_name)
 		branch_name = find_branch_name(rev);
 
-	msg = body;
+	if (branch_name && *branch_name)
+		read_branch_desc(&description_sb, branch_name);
+
+	if (description_sb.len) {
+		if (infer_subject) {
+			description = format_subject(&subject_sb, description_sb.buf, " ");
+			subject = subject_sb.buf;
+		} else {
+			description = description_sb.buf;
+		}
+	}
+
 	pp.fmt = CMIT_FMT_EMAIL;
 	pp.date_mode.type = DATE_RFC2822;
 	pp.rev = rev;
 	pp.print_email_subject = 1;
 	pp_user_info(&pp, NULL, &sb, committer, encoding);
-	pp_title_line(&pp, &msg, &sb, encoding, need_8bit_cte);
-	pp_remainder(&pp, &msg, &sb, 0);
-	add_branch_description(&sb, branch_name);
+	pp_title_line(&pp, &subject, &sb, encoding, need_8bit_cte);
+	pp_remainder(&pp, &body, &sb, 0);
+	if (description) {
+		strbuf_addch(&sb, '\n');
+		strbuf_addstr(&sb, description);
+		strbuf_addch(&sb, '\n');
+	}
 	fprintf(rev->diffopt.file, "%s\n", sb.buf);
 
+	strbuf_release(&description_sb);
+	strbuf_release(&subject_sb);
 	strbuf_release(&sb);
 
 	shortlog_init(&log);
@@ -1577,6 +1589,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		{ OPTION_CALLBACK, 0, "rfc", &rev, NULL,
 			    N_("Use [RFC PATCH] instead of [PATCH]"),
 			    PARSE_OPT_NOARG | PARSE_OPT_NONEG, rfc_callback },
+		OPT_BOOL(0, "infer-cover-subject", &infer_cover_subject,
+			    N_("infer a cover letter subject from the branch description")),
 		{ OPTION_CALLBACK, 0, "subject-prefix", &rev, N_("prefix"),
 			    N_("Use [<prefix>] instead of [PATCH]"),
 			    PARSE_OPT_NONEG, subject_prefix_callback },
@@ -1916,7 +1930,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		if (thread)
 			gen_message_id(&rev, "cover");
 		make_cover_letter(&rev, use_stdout,
-				  origin, nr, list, branch_name, quiet);
+				  origin, nr, list, branch_name, infer_cover_subject, quiet);
 		print_bases(&bases, rev.diffopt.file);
 		print_signature(rev.diffopt.file);
 		total++;
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 0114608b1f..ad920bb063 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -1558,6 +1558,39 @@ test_expect_success 'format patch ignores color.ui' '
 	test_cmp expect actual
 '
 
+test_expect_success 'cover letter with config subject' '
+	test_config branch.rebuild-1.description "config subject
+
+body" &&
+	test_config format.inferCoverSubject true &&
+	git checkout rebuild-1 &&
+	git format-patch --stdout --cover-letter master >actual &&
+	grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
+	grep "^body" actual
+'
+
+test_expect_success 'cover letter with command-line subject' '
+	test_config branch.rebuild-1.description "command-line subject
+
+body" &&
+	git checkout rebuild-1 &&
+	git format-patch --stdout --cover-letter --infer-cover-subject master >actual &&
+	grep "^Subject: \[PATCH 0/2\] command-line subject$" actual &&
+	grep "^body" actual
+'
+
+test_expect_success 'cover letter with command-line --no-infer-cover-subject overrides config' '
+	test_config branch.rebuild-1.description "config subject
+
+body" &&
+	test_config format.inferCoverSubject true &&
+	git checkout rebuild-1 &&
+	git format-patch --stdout --cover-letter --no-infer-cover-subject master >actual &&
+	grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
+	grep "^config subject" actual &&
+	grep "^body" actual
+'
+
 test_expect_success 'cover letter using branch description (1)' '
 	git checkout rebuild-1 &&
 	test_config branch.rebuild-1.description hello &&
-- 
2.23.0.248.g3a9dd8fb08


  parent reply index

Thread overview: 91+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-19 23:52 [PATCH v2 0/4] format-patch: learn --infer-cover-subject option Denton Liu
2019-08-19 23:52 ` [PATCH v2 1/4] t4014: clean up style Denton Liu
2019-08-20  2:41   ` Eric Sunshine
2019-08-19 23:52 ` [PATCH v2 2/4] Doc: add more detail for git-format-patch Denton Liu
2019-08-20  2:44   ` Eric Sunshine
2019-08-20  7:07     ` Denton Liu
2019-08-19 23:52 ` [PATCH v2 3/4] config/format.txt: make clear the default value of format.coverLetter Denton Liu
2019-08-20  2:47   ` Eric Sunshine
2019-08-19 23:52 ` Denton Liu [this message]
2019-08-20  3:46   ` [PATCH v2 4/4] format-patch: learn --infer-cover-letter option Eric Sunshine
2019-08-20  7:18 ` [PATCH v3 00/13] format-patch: learn --infer-cover-subject option (also t4014 cleanup) Denton Liu
2019-08-20  7:18   ` [PATCH v3 01/13] t4014: drop unnecessary blank lines from test cases Denton Liu
2019-08-20  7:18   ` [PATCH v3 02/13] t4014: s/expected/expect/ Denton Liu
2019-08-20 21:31     ` Eric Sunshine
2019-08-20  7:18   ` [PATCH v3 03/13] t4014: move closing sq onto its own line Denton Liu
2019-08-20  7:18   ` [PATCH v3 04/13] t4014: use sq for test case names Denton Liu
2019-08-20  7:18   ` [PATCH v3 05/13] t4014: remove spaces after redirect operators Denton Liu
2019-08-20  7:18   ` [PATCH v3 06/13] t4014: use indentable here-docs Denton Liu
2019-08-20  7:19   ` [PATCH v3 07/13] t4014: drop redirections to /dev/null Denton Liu
2019-08-20  7:19   ` [PATCH v3 08/13] t4014: use test_line_count() where possible Denton Liu
2019-08-20  7:19   ` [PATCH v3 09/13] t4014: remove confusing pipe in check_threading() Denton Liu
2019-08-20  7:19   ` [PATCH v3 10/13] t4014: stop losing return codes of git commands Denton Liu
2019-08-20  7:31     ` Denton Liu
2019-08-20 19:04       ` Johannes Sixt
2019-08-20  7:19   ` [PATCH v3 11/13] Doc: add more detail for git-format-patch Denton Liu
2019-08-21 18:26     ` Junio C Hamano
2019-08-20  7:19   ` [PATCH v3 12/13] config/format.txt: specify default value of format.coverLetter Denton Liu
2019-08-20  7:19   ` [PATCH v3 13/13] format-patch: learn --infer-cover-subject option Denton Liu
2019-08-21 19:32     ` Junio C Hamano
2019-08-23 18:15       ` Denton Liu
2019-08-23 18:46         ` Philip Oakley
2019-08-23 20:18           ` Junio C Hamano
2019-08-24  8:03             ` Denton Liu
2019-08-24 13:59               ` Philip Oakley
2019-08-26 14:30                 ` Junio C Hamano
2019-08-26 14:26               ` Junio C Hamano
2019-08-26 16:05                 ` Junio C Hamano
2019-08-22 20:18   ` [PATCH v3 00/13] format-patch: learn --infer-cover-subject option (also t4014 cleanup) Junio C Hamano
2019-08-23 18:19     ` Denton Liu
2019-08-23 20:25       ` Junio C Hamano
2019-08-24  8:25   ` [PATCH 00/13] format-patch: clean up tests and documentation Denton Liu
2019-08-24  8:26     ` [PATCH 01/13] t4014: drop unnecessary blank lines from test cases Denton Liu
2019-08-24  8:26     ` [PATCH 02/13] t4014: s/expected/expect/ Denton Liu
2019-08-24  8:26     ` [PATCH 03/13] t4014: move closing sq onto its own line Denton Liu
2019-08-24  8:26     ` [PATCH 04/13] t4014: use sq for test case names Denton Liu
2019-08-24  8:26     ` [PATCH 05/13] t4014: remove spaces after redirect operators Denton Liu
2019-08-24  8:27     ` [PATCH 06/13] t4014: use indentable here-docs Denton Liu
2019-08-24  8:27     ` [PATCH 07/13] t4014: drop redirections to /dev/null Denton Liu
2019-08-24  8:27     ` [PATCH 08/13] t4014: let sed open its own files Denton Liu
2019-08-26  0:42       ` Eric Sunshine
2019-08-24  8:27     ` [PATCH 09/13] t4014: use test_line_count() where possible Denton Liu
2019-08-24  8:27     ` [PATCH 10/13] t4014: remove confusing pipe in check_threading() Denton Liu
2019-08-24  8:27     ` [PATCH 11/13] t4014: stop losing return codes of git commands Denton Liu
2019-08-24  8:27     ` [PATCH 12/13] Doc: add more detail for git-format-patch Denton Liu
2019-08-26 15:20       ` Junio C Hamano
2019-08-26 16:07         ` Junio C Hamano
2019-08-24  8:27     ` [PATCH 13/13] config/format.txt: specify default value of format.coverLetter Denton Liu
2019-08-24  8:28     ` [PATCH 00/13] format-patch: clean up tests and documentation Denton Liu
2019-08-26 15:21       ` Junio C Hamano
2019-08-27  4:04     ` [PATCH v2 " Denton Liu
2019-08-27  4:04       ` [PATCH v2 01/13] t4014: drop unnecessary blank lines from test cases Denton Liu
2019-08-27  4:04       ` [PATCH v2 02/13] t4014: s/expected/expect/ Denton Liu
2019-08-27  4:04       ` [PATCH v2 03/13] t4014: move closing sq onto its own line Denton Liu
2019-08-27  4:04       ` [PATCH v2 04/13] t4014: use sq for test case names Denton Liu
2019-08-27  4:05       ` [PATCH v2 05/13] t4014: remove spaces after redirect operators Denton Liu
2019-08-27  4:05       ` [PATCH v2 06/13] t4014: use indentable here-docs Denton Liu
2019-08-27  4:05       ` [PATCH v2 07/13] t4014: drop redirections to /dev/null Denton Liu
2019-08-27  4:05       ` [PATCH v2 08/13] t4014: let sed open its own files Denton Liu
2019-08-27  4:05       ` [PATCH v2 09/13] t4014: use test_line_count() where possible Denton Liu
2019-08-27  4:05       ` [PATCH v2 10/13] t4014: remove confusing pipe in check_threading() Denton Liu
2019-08-27  4:05       ` [PATCH v2 11/13] t4014: stop losing return codes of git commands Denton Liu
2019-08-27  4:05       ` [PATCH v2 12/13] Doc: add more detail for git-format-patch Denton Liu
2019-08-27  4:05       ` [PATCH v2 13/13] config/format.txt: specify default value of format.coverLetter Denton Liu
2019-09-04 11:21       ` [PATCH v2 00/13] format-patch: clean up tests and documentation Denton Liu
2019-09-05 19:56         ` Junio C Hamano
2019-09-05 21:40           ` Denton Liu
2019-10-11 19:12   ` [PATCH v4 0/3] format-patch: learn --cover-from-description option Denton Liu
2019-10-11 19:12     ` [PATCH v4 1/3] format-patch: remove erroneous and condition Denton Liu
2019-10-11 19:12     ` [PATCH v4 2/3] format-patch: use enum variables Denton Liu
2019-10-12  2:16       ` Junio C Hamano
2019-10-11 19:12     ` [PATCH v4 3/3] format-patch: teach --cover-from-description option Denton Liu
2019-10-12  2:36       ` Junio C Hamano
2019-10-11 19:23     ` [PATCH v4 4/3] fixup! " Denton Liu
2019-10-12  4:18     ` [PATCH v4 0/3] format-patch: learn " Junio C Hamano
2019-10-14 20:46     ` [PATCH v5 " Denton Liu
2019-10-14 20:46       ` [PATCH v5 1/3] format-patch: change erroneous and condition Denton Liu
2019-10-15  2:16         ` Junio C Hamano
2019-10-15  3:45           ` Denton Liu
2019-10-14 20:47       ` [PATCH v5 2/3] format-patch: use enum variables Denton Liu
2019-10-14 20:47       ` [PATCH v5 3/3] format-patch: teach --cover-from-description option Denton Liu
2019-10-15  2:25         ` Junio C Hamano

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