[PATCH v10 2/3] interpret-trailers: add own-identity option

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From: ZheNing Hu <adlternative@xxxxxxxxx>

Beacuse `git commit --trailer="Signed-off-by: \
$(git config user.name) <$(git config user.email)>"`
is difficult for users to add their own identities,
so teach interpret-trailers a new option `--own-identity`
which allow those trailers with no value add the user’s own
identity. This will help the use of `commit --trailer` as
easy as `--signoff`.

Signed-off-by: ZheNing Hu <adlternative@xxxxxxxxx>
---
 Documentation/git-interpret-trailers.txt | 14 ++++++++++++++
 builtin/interpret-trailers.c             |  6 ++++--
 t/t7513-interpret-trailers.sh            | 12 ++++++++++++
 trailer.c                                | 18 ++++++++++++++++--
 trailer.h                                |  3 ++-
 5 files changed, 48 insertions(+), 5 deletions(-)

diff --git a/Documentation/git-interpret-trailers.txt b/Documentation/git-interpret-trailers.txt
index 96ec6499f001..ace44446c3e3 100644
--- a/Documentation/git-interpret-trailers.txt
+++ b/Documentation/git-interpret-trailers.txt
@@ -84,6 +84,19 @@ OPTIONS
 	trailer to the input messages. See the description of this
 	command.
 
+--own-identity::
+	Used with `--trailer`. Those trailers without value with the
+	`--own-identity` option all will add the user's own identity.
+	For example,` git interpret-trailers --trailer "A:B" --trailer \
+	"Signed-off-by" --trailer "Helped-by" --own-identity --inplace a.txt`
+	will output:
+	"
+	A:B
+	Signed-off-by: C O Mitter <committer@xxxxxxxxxxx>
+	Helped-by: C O Mitter <committer@xxxxxxxxxxx>
+	"
+	in `a.txt`.
+
 --where <placement>::
 --no-where::
 	Specify where all new trailers will be added.  A setting
@@ -131,6 +144,7 @@ OPTIONS
 	when you know your input contains just the commit message itself
 	(and not an email or the output of `git format-patch`).
 
+
 CONFIGURATION VARIABLES
 -----------------------
 
diff --git a/builtin/interpret-trailers.c b/builtin/interpret-trailers.c
index 84748eafc01b..be7f502a58d7 100644
--- a/builtin/interpret-trailers.c
+++ b/builtin/interpret-trailers.c
@@ -47,6 +47,7 @@ static void new_trailers_clear(struct list_head *trailers)
 	list_for_each_safe(pos, tmp, trailers) {
 		item = list_entry(pos, struct new_trailer_item, list);
 		list_del(pos);
+		free(item->text);
 		free(item);
 	}
 }
@@ -66,7 +67,7 @@ static int option_parse_trailer(const struct option *opt,
 		return -1;
 
 	item = xmalloc(sizeof(*item));
-	item->text = arg;
+	item->text = xstrdup(arg);
 	item->where = where;
 	item->if_exists = if_exists;
 	item->if_missing = if_missing;
@@ -94,7 +95,8 @@ int cmd_interpret_trailers(int argc, const char **argv, const char *prefix)
 	struct option options[] = {
 		OPT_BOOL(0, "in-place", &opts.in_place, N_("edit files in place")),
 		OPT_BOOL(0, "trim-empty", &opts.trim_empty, N_("trim empty trailers")),
-
+		OPT_BOOL(0, "own-identity", &opts.own_identity,
+			     N_("specify the user's own identity for omitted trailers value")),
 		OPT_CALLBACK(0, "where", NULL, N_("action"),
 			     N_("where to place the new trailer"), option_parse_where),
 		OPT_CALLBACK(0, "if-exists", NULL, N_("action"),
diff --git a/t/t7513-interpret-trailers.sh b/t/t7513-interpret-trailers.sh
index 6602790b5f4c..f82cee93bfb2 100755
--- a/t/t7513-interpret-trailers.sh
+++ b/t/t7513-interpret-trailers.sh
@@ -63,6 +63,18 @@ test_expect_success 'without config' '
 	test_cmp expected actual
 '
 
+test_expect_success 'without config with --own-identity' '
+	cat >expected <<-\EOF &&
+
+	Acked-by: A B <C>
+	Helped-by: C O Mitter <committer@xxxxxxxxxxx>
+	Signed-off-by: C O Mitter <committer@xxxxxxxxxxx>
+	EOF
+	git interpret-trailers --trailer "Acked-by: A B <C>" --trailer "Helped-by" \
+	--trailer "Signed-off-by" --own-identity empty >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success 'without config in another order' '
 	sed -e "s/ Z\$/ /" >expected <<-\EOF &&
 
diff --git a/trailer.c b/trailer.c
index 249ed618ed8e..cd4f85e71c9a 100644
--- a/trailer.c
+++ b/trailer.c
@@ -690,8 +690,18 @@ static void add_arg_item(struct list_head *arg_head, char *tok, char *val,
 	list_add_tail(&new_item->list, arg_head);
 }
 
+static void add_user_own_identity(struct new_trailer_item *item)
+{
+	struct strbuf buf = STRBUF_INIT;
+	strbuf_addstr(&buf, item->text);
+	strbuf_add(&buf, "=", 1);
+	strbuf_addstr(&buf, fmt_name(WANT_COMMITTER_IDENT));
+	free(item->text);
+	item->text = buf.buf;
+}
+
 static void process_command_line_args(struct list_head *arg_head,
-				      struct list_head *new_trailer_head)
+				      struct list_head *new_trailer_head, int own_identity)
 {
 	struct arg_item *item;
 	struct strbuf tok = STRBUF_INIT;
@@ -728,6 +738,10 @@ static void process_command_line_args(struct list_head *arg_head,
 			error(_("empty trailer token in trailer '%.*s'"),
 			      (int) sb.len, sb.buf);
 			strbuf_release(&sb);
+		} else if (separator_pos == -1 && own_identity) {
+				add_user_own_identity(tr);
+				pos = pos->prev;
+				continue;
 		} else {
 			parse_trailer(&tok, &val, &conf, tr->text,
 				      separator_pos);
@@ -1048,7 +1062,7 @@ void process_trailers(const char *file,
 
 	if (!opts->only_input) {
 		LIST_HEAD(arg_head);
-		process_command_line_args(&arg_head, new_trailer_head);
+		process_command_line_args(&arg_head, new_trailer_head ,opts->own_identity);
 		process_trailers_lists(&head, &arg_head);
 	}
 
diff --git a/trailer.h b/trailer.h
index 795d2fccfd95..235dfdfa1978 100644
--- a/trailer.h
+++ b/trailer.h
@@ -57,7 +57,7 @@ struct trailer_info {
 struct new_trailer_item {
 	struct list_head list;
 
-	const char *text;
+	char *text;
 
 	enum trailer_where where;
 	enum trailer_if_exists if_exists;
@@ -73,6 +73,7 @@ struct process_trailer_options {
 	int no_divider;
 	int key_only;
 	int value_only;
+	int own_identity;
 	const struct strbuf *separator;
 	const struct strbuf *key_value_separator;
 	int (*filter)(const struct strbuf *, void *);
-- 
gitgitgadget




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