[PATCH 03/10] pkt-line: optionally skip the flush packet in write_packetized_from_buf()

["Johannes Schindelin via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: Johannes Schindelin <johannes.schindelin@xxxxxx>

This function currently has only one caller: `apply_multi_file_filter()`
in `convert.c`. That caller wants a flush packet to be written after
writing the payload.

However, we are about to introduce a user that wants to write many
packets before a final flush packet, so let's extend this function to
prepare for that scenario.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 convert.c  | 2 +-
 pkt-line.c | 5 +++--
 pkt-line.h | 3 ++-
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/convert.c b/convert.c
index ee360c2f07c..3f396a9b288 100644
--- a/convert.c
+++ b/convert.c
@@ -886,7 +886,7 @@ static int apply_multi_file_filter(const char *path, const char *src, size_t len
 	if (fd >= 0)
 		err = write_packetized_from_fd(fd, process->in);
 	else
-		err = write_packetized_from_buf(src, len, process->in);
+		err = write_packetized_from_buf(src, len, process->in, 1);
 	if (err)
 		goto done;
 
diff --git a/pkt-line.c b/pkt-line.c
index 5c2d86a2f60..ef83439b9ee 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -261,7 +261,8 @@ int write_packetized_from_fd(int fd_in, int fd_out)
 	return err;
 }
 
-int write_packetized_from_buf(const char *src_in, size_t len, int fd_out)
+int write_packetized_from_buf(const char *src_in, size_t len, int fd_out,
+			      int flush_at_end)
 {
 	int err = 0;
 	size_t bytes_written = 0;
@@ -277,7 +278,7 @@ int write_packetized_from_buf(const char *src_in, size_t len, int fd_out)
 		err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write);
 		bytes_written += bytes_to_write;
 	}
-	if (!err)
+	if (!err && flush_at_end)
 		err = packet_flush_gently(fd_out);
 	return err;
 }
diff --git a/pkt-line.h b/pkt-line.h
index c1fa245faf8..5b7a0fb8510 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -33,7 +33,8 @@ void packet_buf_write_len(struct strbuf *buf, const char *data, size_t len);
 int packet_flush_gently(int fd);
 int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
 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);
+int write_packetized_from_buf(const char *src_in, size_t len, int fd_out,
+			      int flush_at_end);
 
 /*
  * Read a packetized line into the buffer, which must be at least size bytes
-- 
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