[PATCHv2] tag: add --edit option

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Add a --edit option whichs allows modifying the messages provided by -m or -F,
the same way git commit --edit does.

Signed-off-by: Nicolas Morey-Chaisemartin <NMoreyChaisemartin@xxxxxxxx>
---

Changes since v1:
- Fix usage string
- Use write_script to generate editor
- Rename editor to fakeeditor to match the other tests in the testsuite
- I'll post another series to fix the misleading messages in both commit.c and tag.c when launch_editor fails

 Documentation/git-tag.txt |  6 ++++++
 builtin/tag.c             | 11 +++++++++--
 t/t7004-tag.sh            | 30 ++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index 956fc019f984..b9e5a993bea0 100644
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt
@@ -167,6 +167,12 @@ This option is only applicable when listing tags without annotation lines.
 	Implies `-a` if none of `-a`, `-s`, or `-u <keyid>`
 	is given.
 
+-e::
+--edit::
+	The message taken from file with `-F` and command line with
+	`-m` are usually used as the tag message unmodified.
+	This option lets you further edit the message taken from these sources.
+
 --cleanup=<mode>::
 	This option sets how the tag message is cleaned up.
 	The  '<mode>' can be one of 'verbatim', 'whitespace' and 'strip'.  The
diff --git a/builtin/tag.c b/builtin/tag.c
index a7e6a5b0f234..ce5cac3dd23f 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -194,6 +194,7 @@ static int build_tag_object(struct strbuf *buf, int sign, struct object_id *resu
 
 struct create_tag_options {
 	unsigned int message_given:1;
+	unsigned int use_editor:1;
 	unsigned int sign;
 	enum {
 		CLEANUP_NONE,
@@ -224,7 +225,7 @@ static void create_tag(const struct object_id *object, const char *tag,
 		    tag,
 		    git_committer_info(IDENT_STRICT));
 
-	if (!opt->message_given) {
+	if (!opt->message_given || opt->use_editor) {
 		int fd;
 
 		/* write the template message before editing: */
@@ -233,7 +234,10 @@ static void create_tag(const struct object_id *object, const char *tag,
 		if (fd < 0)
 			die_errno(_("could not create file '%s'"), path);
 
-		if (!is_null_oid(prev)) {
+		if (opt->message_given) {
+			write_or_die(fd, buf->buf, buf->len);
+			strbuf_reset(buf);
+		} else if (!is_null_oid(prev)) {
 			write_tag_body(fd, prev);
 		} else {
 			struct strbuf buf = STRBUF_INIT;
@@ -372,6 +376,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 	static struct ref_sorting *sorting = NULL, **sorting_tail = &sorting;
 	struct ref_format format = REF_FORMAT_INIT;
 	int icase = 0;
+	int edit_flag = 0;
 	struct option options[] = {
 		OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
 		{ OPTION_INTEGER, 'n', NULL, &filter.lines, N_("n"),
@@ -386,6 +391,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 		OPT_CALLBACK('m', "message", &msg, N_("message"),
 			     N_("tag message"), parse_msg_arg),
 		OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
+		OPT_BOOL('e', "edit", &edit_flag, N_("force edit of tag message")),
 		OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 		OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
 			N_("how to strip spaces and #comments from message")),
@@ -524,6 +530,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 		die(_("tag '%s' already exists"), tag);
 
 	opt.message_given = msg.given || msgfile;
+	opt.use_editor = edit_flag;
 
 	if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 		opt.cleanup_mode = CLEANUP_ALL;
diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index a9af2de9960b..063996ddc05c 100755
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -452,6 +452,21 @@ test_expect_success \
 	test_cmp expect actual
 '
 
+get_tag_header annotated-tag-edit $commit commit $time >expect
+echo "An edited message" >>expect
+test_expect_success 'set up editor' '
+	write_script fakeeditor <<-\EOF
+	sed -e "s/A message/An edited message/g" <"$1" >"$1-"
+	mv "$1-" "$1"
+	EOF
+'
+test_expect_success \
+	'creating an annotated tag with -m message --edit should succeed' '
+	EDITOR=./fakeeditor	git tag -m "A message" --edit annotated-tag-edit &&
+	get_tag_msg annotated-tag-edit >actual &&
+	test_cmp expect actual
+'
+
 cat >msgfile <<EOF
 Another message
 in a file.
@@ -465,6 +480,21 @@ test_expect_success \
 	test_cmp expect actual
 '
 
+get_tag_header file-annotated-tag-edit $commit commit $time >expect
+sed -e "s/Another message/Another edited message/g" msgfile >>expect
+test_expect_success 'set up editor' '
+	write_script fakeeditor <<-\EOF
+	sed -e "s/Another message/Another edited message/g" <"$1" >"$1-"
+	mv "$1-" "$1"
+	EOF
+'
+test_expect_success \
+	'creating an annotated tag with -F messagefile --edit should succeed' '
+	EDITOR=./fakeeditor	git tag -F msgfile --edit file-annotated-tag-edit &&
+	get_tag_msg file-annotated-tag-edit >actual &&
+	test_cmp expect actual
+'
+
 cat >inputmsg <<EOF
 A message from the
 standard input
-- 
2.16.1.72.g5be1f00a9a70.dirty




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