Before, when format-patch generated a cover letter, only the body would
be populated with a branch's description while the subject would be
populated with placeholder text. However, users may want to have the
subject of their cover letter automatically populated in the same way.
Teach format-patch to accept the `--cover-from-description` option and
corresponding `format.coverFromDescription` config, allowing users to
populate different parts of the cover letter (including the subject
now).
Signed-off-by: Denton Liu <liu.denton@xxxxxxxxx>
---
Documentation/config/format.txt | 6 +
Documentation/git-format-patch.txt | 22 ++++
builtin/log.c | 95 ++++++++++++----
t/t4014-format-patch.sh | 172 +++++++++++++++++++++++++++++
t/t9902-completion.sh | 5 +-
5 files changed, 279 insertions(+), 21 deletions(-)
diff --git a/Documentation/config/format.txt b/Documentation/config/format.txt
index cb629fa769..735dfcf827 100644
--- a/Documentation/config/format.txt
+++ b/Documentation/config/format.txt
@@ -36,6 +36,12 @@ format.subjectPrefix::
The default for format-patch is to output files with the '[PATCH]'
subject prefix. Use this variable to change that prefix.
+format.coverFromDescription::
+ The default mode for format-patch to determine which parts of
+ the cover letter will be populated using the branch's
+ description. See the `--cover-from-description` option in
+ linkgit:git-format-patch[1].
+
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 0ac56f4b70..6800e1ab9a 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]
+ [--cover-from-description=<mode>]
[--rfc] [--subject-prefix=<subject prefix>]
[(--reroll-count|-v) <n>]
[--to=<email>] [--cc=<email>]
@@ -171,6 +172,26 @@ will want to ensure that threading is disabled for `git send-email`.
patches being generated, and any patch that matches is
ignored.
+--cover-from-description=<mode>::
+ Controls which parts of the cover letter will be automatically
+ populated using the branch's description.
++
+If `<mode>` is `message` or `default`, the cover letter subject will be
+populated with placeholder text. The body of the cover letter will be
+populated with the branch's description. This is the default mode when
+no configuration nor command line option is specified.
++
+If `<mode>` is `subject`, the first paragraph of the branch description will
+populate the cover letter subject. The remainder of the description will
+populate the body of the cover letter.
++
+If `<mode>` is `auto`, if the first paragraph of the branch description
+is greater than 100 bytes, then the mode will be `message`, otherwise
+`subject` will be used.
++
+If `<mode>` is `none`, both the cover letter subject and body will be
+populated with placeholder text.
+
--subject-prefix=<subject prefix>::
Instead of the standard '[PATCH]' prefix in the subject
line, instead use '[<subject prefix>]'. This
@@ -347,6 +368,7 @@ with configuration variables.
signOff = true
outputDirectory = <directory>
coverLetter = auto
+ coverFromDescription = auto
------------
diff --git a/builtin/log.c b/builtin/log.c
index d212a8305d..af33fe9ffb 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -37,6 +37,7 @@
#include "range-diff.h"
#define MAIL_DEFAULT_WRAP 72
+#define COVER_FROM_AUTO_MAX_SUBJECT_LEN 100
/* Set a default date-time format for git log ("log.date" config variable) */
static const char *default_date_mode = NULL;
@@ -777,6 +778,13 @@ enum thread_level {
THREAD_DEEP
};
+enum cover_from_description {
+ COVER_FROM_NONE,
+ COVER_FROM_MESSAGE,
+ COVER_FROM_SUBJECT,
+ COVER_FROM_AUTO
+};
+
static enum thread_level thread;
static int do_signoff;
static int base_auto;
@@ -785,6 +793,23 @@ static const char *signature = git_version_string;
static const char *signature_file;
static enum cover_setting config_cover_letter;
static const char *config_output_directory;
+static enum cover_from_description cover_from_description_mode = COVER_FROM_MESSAGE;
+
+static enum cover_from_description parse_cover_from_description(const char *arg)
+{
+ if (!arg || !strcmp(arg, "default"))
+ return COVER_FROM_MESSAGE;
+ else if (!strcmp(arg, "none"))
+ return COVER_FROM_NONE;
+ else if (!strcmp(arg, "message"))
+ return COVER_FROM_MESSAGE;
+ else if (!strcmp(arg, "subject"))
+ return COVER_FROM_SUBJECT;
+ else if (!strcmp(arg, "auto"))
+ return COVER_FROM_AUTO;
+ else
+ die(_("%s: invalid cover from description mode"), arg);
+}
static int git_format_config(const char *var, const char *value, void *cb)
{
@@ -891,6 +916,10 @@ static int git_format_config(const char *var, const char *value, void *cb)
}
return 0;
}
+ if (!strcmp(var, "format.coverfromdescription")) {
+ cover_from_description_mode = parse_cover_from_description(value);
+ return 0;
+ }
return git_log_config(var, value, cb);
}
@@ -997,20 +1026,6 @@ 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;
@@ -1057,6 +1072,44 @@ static void show_diffstat(struct rev_info *rev,
fprintf(rev->diffopt.file, "\n");
}
+static void pp_from_desc(struct pretty_print_context *pp,
+ const char *branch_name,
+ struct strbuf *sb,
+ const char *encoding,
+ int need_8bit_cte)
+{
+ const char *subject = "*** SUBJECT HERE ***";
+ const char *body = "*** BLURB HERE ***";
+ struct strbuf description_sb = STRBUF_INIT;
+ struct strbuf subject_sb = STRBUF_INIT;
+
+ if (cover_from_description_mode == COVER_FROM_NONE)
+ goto do_pp;
+
+ if (branch_name && *branch_name)
+ read_branch_desc(&description_sb, branch_name);
+ if (!description_sb.len)
+ goto do_pp;
+
+ if (cover_from_description_mode == COVER_FROM_SUBJECT ||
+ cover_from_description_mode == COVER_FROM_AUTO)
+ body = format_subject(&subject_sb, description_sb.buf, " ");
+
+ if (cover_from_description_mode == COVER_FROM_MESSAGE ||
+ (cover_from_description_mode == COVER_FROM_AUTO &&
+ subject_sb.len > COVER_FROM_AUTO_MAX_SUBJECT_LEN))
+ body = description_sb.buf;
+ else
+ subject = subject_sb.buf;
+
+do_pp:
+ pp_title_line(pp, &subject, sb, encoding, need_8bit_cte);
+ pp_remainder(pp, &body, sb, 0);
+
+ strbuf_release(&description_sb);
+ strbuf_release(&subject_sb);
+}
+
static void make_cover_letter(struct rev_info *rev, int use_stdout,
struct commit *origin,
int nr, struct commit **list,
@@ -1064,8 +1117,6 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
int quiet)
{
const char *committer;
- const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
- const char *msg;
struct shortlog log;
struct strbuf sb = STRBUF_INIT;
int i;
@@ -1095,15 +1146,12 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
if (!branch_name)
branch_name = find_branch_name(rev);
- msg = body;
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_from_desc(&pp, branch_name, &sb, encoding, need_8bit_cte);
fprintf(rev->diffopt.file, "%s\n", sb.buf);
strbuf_release(&sb);
@@ -1545,6 +1593,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
int use_patch_format = 0;
int quiet = 0;
int reroll_count = -1;
+ char *cover_from_description_arg = NULL;
char *branch_name = NULL;
char *base_commit = NULL;
struct base_tree_info bases;
@@ -1581,6 +1630,9 @@ 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_STRING(0, "cover-from-description", &cover_from_description_arg,
+ N_("cover-from-description-mode"),
+ N_("generate parts of a cover letter based on a branch's description")),
{ OPTION_CALLBACK, 0, "subject-prefix", &rev, N_("prefix"),
N_("Use [<prefix>] instead of [PATCH]"),
PARSE_OPT_NONEG, subject_prefix_callback },
@@ -1672,6 +1724,9 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
PARSE_OPT_KEEP_DASHDASH);
+ if (cover_from_description_arg)
+ cover_from_description_mode = parse_cover_from_description(cover_from_description_arg);
+
if (0 < reroll_count) {
struct strbuf sprefix = STRBUF_INIT;
strbuf_addf(&sprefix, "%s v%d",
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 72b09896cf..88db01308a 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -1517,6 +1517,178 @@ test_expect_success 'format patch ignores color.ui' '
test_cmp expect actual
'
+test_expect_success 'cover letter with invalid --cover-from-description and config' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ test_must_fail git format-patch --cover-letter --cover-from-description garbage master &&
+ test_config format.coverFromDescription garbage &&
+ test_must_fail git format-patch --cover-letter master
+'
+
+test_expect_success 'cover letter with format.coverFromDescription = default' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ test_config format.coverFromDescription default &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter master >actual &&
+ grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ grep "^config subject$" actual &&
+ grep "^body$" actual
+'
+
+test_expect_success 'cover letter with --cover-from-description default' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter --cover-from-description default master >actual &&
+ grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ grep "^config subject$" actual &&
+ grep "^body$" actual
+'
+
+test_expect_success 'cover letter with format.coverFromDescription = none' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ test_config format.coverFromDescription none &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter master >actual &&
+ grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
+ grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ ! grep "^config subject$" actual &&
+ ! grep "^body$" actual
+'
+
+test_expect_success 'cover letter with --cover-from-description none' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter --cover-from-description none master >actual &&
+ grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
+ grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ ! grep "^config subject$" actual &&
+ ! grep "^body$" actual
+'
+
+test_expect_success 'cover letter with format.coverFromDescription = message' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ test_config format.coverFromDescription message &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter master >actual &&
+ grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ grep "^config subject$" actual &&
+ grep "^body$" actual
+'
+
+test_expect_success 'cover letter with --cover-from-description message' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter --cover-from-description message master >actual &&
+ grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ grep "^config subject$" actual &&
+ grep "^body$" actual
+'
+
+test_expect_success 'cover letter with format.coverFromDescription = subject' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ test_config format.coverFromDescription subject &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter master >actual &&
+ grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ ! grep "^config subject$" actual &&
+ grep "^body$" actual
+'
+
+test_expect_success 'cover letter with --cover-from-description subject' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter --cover-from-description subject master >actual &&
+ grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ ! grep "^config subject$" actual &&
+ grep "^body$" actual
+'
+
+test_expect_success 'cover letter with format.coverFromDescription = auto (short subject line)' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ test_config format.coverFromDescription auto &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter master >actual &&
+ grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ ! grep "^config subject$" actual &&
+ grep "^body$" actual
+'
+
+test_expect_success 'cover letter with --cover-from-description auto (short subject line)' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter --cover-from-description auto master >actual &&
+ grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ ! grep "^config subject$" actual &&
+ grep "^body$" actual
+'
+
+test_expect_success 'cover letter with format.coverFromDescription = auto (long subject line)' '
+ test_config branch.rebuild-1.description "this is a really long first line and it is over 100 characters long which is the threshold for long subjects
+
+body" &&
+ test_config format.coverFromDescription auto &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter master >actual &&
+ grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ grep "^this is a really long first line and it is over 100 characters long which is the threshold for long subjects$" actual &&
+ grep "^body$" actual
+'
+
+test_expect_success 'cover letter with --cover-from-description auto (long subject line)' '
+ test_config branch.rebuild-1.description "this is a really long first line and it is over 100 characters long which is the threshold for long subjects
+
+body" &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter --cover-from-description auto master >actual &&
+ grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
+ grep "^this is a really long first line and it is over 100 characters long which is the threshold for long subjects$" actual &&
+ grep "^body$" actual
+'
+
+test_expect_success 'cover letter with command-line --cover-from-description overrides config' '
+ test_config branch.rebuild-1.description "config subject
+
+body" &&
+ test_config format.coverFromDescription none &&
+ git checkout rebuild-1 &&
+ git format-patch --stdout --cover-letter --cover-from-description subject master >actual &&
+ grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
+ ! grep "^\*\*\* BLURB HERE \*\*\*$" 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 &&
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 75512c3403..5187e2ede5 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -1548,7 +1548,10 @@ test_expect_success 'complete tree filename with metacharacters' '
'
test_expect_success PERL 'send-email' '
- test_completion "git send-email --cov" "--cover-letter " &&
+ test_completion "git send-email --cov" <<-\EOF &&
+ --cover-from-description=Z
+ --cover-letter Z
+ EOF
test_completion "git send-email ma" "master "
'
--
2.23.0.17.g315c308950
