[RFC PATCH] show: Add support for -format=raw -body=false

[David Edmondson <dme@dme.org>]

Similar to other formats, allow the body to be omitted when outputting
raw messages.

This can be used by UI code to get the full headers of a message
without the need to consume the body, which may be large.
---
 notmuch-show.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/notmuch-show.c b/notmuch-show.c
index dd836add..f52e6a40 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -888,6 +888,8 @@ format_part_raw (unused (const void *ctx), unused (sprinter_t *sp),
 	ssize_t ssize;
 	char buf[4096];
 	notmuch_status_t ret = NOTMUCH_STATUS_FILE_ERROR;
+	unsigned int cr_count = 0;
+	notmuch_bool_t done = false;
 
 	filename = notmuch_message_get_filename (node->envelope_file);
 	if (filename == NULL) {
@@ -901,13 +903,32 @@ format_part_raw (unused (const void *ctx), unused (sprinter_t *sp),
 	    goto DONE;
 	}
 
-	while (! g_mime_stream_eos (stream)) {
+	while (! done && ! g_mime_stream_eos (stream)) {
 	    ssize = g_mime_stream_read (stream, buf, sizeof (buf));
 	    if (ssize < 0) {
 		fprintf (stderr, "Error: Read failed from %s\n", filename);
 		goto DONE;
 	    }
 
+	    if (! params->output_body) {
+		/*
+		 * Look for two adjacent newlines, as they mark the
+		 * separation of the headers from the body.
+		 */
+		for (ssize_t off = 0; off < ssize; off++) {
+		    if (buf[off] == '\n') {
+			cr_count++;
+		    } else {
+			cr_count = 0;
+		    }
+		    if (cr_count == 2) {
+			ssize = off;
+			done = true;
+			break;
+		    }
+		}
+	    }
+
 	    if (ssize > 0 && fwrite (buf, ssize, 1, stdout) != 1) {
 		fprintf (stderr, "Error: Write %ld chars to stdout failed\n", ssize);
 		goto DONE;
@@ -1310,9 +1331,10 @@ notmuch_show_command (notmuch_config_t *config, int argc, char *argv[])
 	} else {
 	    if (format != NOTMUCH_FORMAT_TEXT &&
 		format != NOTMUCH_FORMAT_JSON &&
-		format != NOTMUCH_FORMAT_SEXP)
+		format != NOTMUCH_FORMAT_SEXP &&
+		format != NOTMUCH_FORMAT_RAW)
 		fprintf (stderr,
-			 "Warning: --body=false only implemented for format=text, format=json and format=sexp\n");
+			 "Warning: --body=false is not implemented for format=mbox\n");
 	}
     }
 
-- 
2.20.1