convert: move packet_write_line() into pkt-line as packet_writel()

Add packet_writel() which writes multiple lines in a single call and
then calls packet_flush_gently(). Update convert.c to use the new
packet_writel() function from pkt-line.

Signed-off-by: Ben Peart <benpeart@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

convert.c

@@ -521,25 +521,6 @@ static struct cmd2process *find_multi_file_filter_entry(struct hashmap *hashmap,
 	return hashmap_get(hashmap, &key, NULL);
 }
 
-static int packet_write_list(int fd, const char *line, ...)
-{
-	va_list args;
-	int err;
-	va_start(args, line);
-	for (;;) {
-		if (!line)
-			break;
-		if (strlen(line) > LARGE_PACKET_DATA_MAX)
-			return -1;
-		err = packet_write_fmt_gently(fd, "%s\n", line);
-		if (err)
-			return err;
-		line = va_arg(args, const char*);
-	}
-	va_end(args);
-	return packet_flush_gently(fd);
-}
-
 static void read_multi_file_filter_status(int fd, struct strbuf *status)
 {
 	struct strbuf **pair;
@@ -616,7 +597,7 @@ static struct cmd2process *start_multi_file_filter(struct hashmap *hashmap, cons
 
 	sigchain_push(SIGPIPE, SIG_IGN);
 
-	err = packet_write_list(process->in, "git-filter-client", "version=2", NULL);
+	err = packet_writel(process->in, "git-filter-client", "version=2", NULL);
 	if (err)
 		goto done;
 
@@ -632,7 +613,7 @@ static struct cmd2process *start_multi_file_filter(struct hashmap *hashmap, cons
 	if (err)
 		goto done;
 
-	err = packet_write_list(process->in, "capability=clean", "capability=smudge", NULL);
+	err = packet_writel(process->in, "capability=clean", "capability=smudge", NULL);
 
 	for (;;) {
 		cap_buf = packet_read_line(process->out, NULL);

pkt-line.c

@@ -171,6 +171,25 @@ int packet_write_fmt_gently(int fd, const char *fmt, ...)
 	return status;
 }
 
+int packet_writel(int fd, const char *line, ...)
+{
+	va_list args;
+	int err;
+	va_start(args, line);
+	for (;;) {
+		if (!line)
+			break;
+		if (strlen(line) > LARGE_PACKET_DATA_MAX)
+			return -1;
+		err = packet_write_fmt_gently(fd, "%s\n", line);
+		if (err)
+			return err;
+		line = va_arg(args, const char*);
+	}
+	va_end(args);
+	return packet_flush_gently(fd);
+}
+
 static int packet_write_gently(const int fd_out, const char *buf, size_t size)
 {
 	static char packet_write_buffer[LARGE_PACKET_MAX];

pkt-line.h

@@ -25,6 +25,7 @@ void packet_buf_flush(struct strbuf *buf);
 void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
 int packet_flush_gently(int fd);
 int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
+int packet_writel(int fd, const char *line, ...);
 int write_packetized_from_fd(int fd_in, int fd_out);
 int write_packetized_from_buf(const char *src_in, size_t len, int fd_out);