[PATCH v2 7/8] show: Convert raw format to the new self-recursive style, properly support interior parts

[Austin Clements <amdragon@MIT.EDU>]

This is fully compatible for root and leaf parts, but now has proper
support for interior parts.  This requires some design decisions that
were guided by what I would want if I were to save a part.
Specifically:

- Leaf parts are printed without headers and with transfer decoding.
  This is what makes sense for saving attachments.  (Furthermore, the
  transfer decoding is necessary since, without the headers, the
  caller would not be able to interpret non-transfer-decoded output.)

- Message parts are printed with their message headers, but without
  enclosing part headers.  This is what makes sense for saving a
  message as a whole (which is a message part) and for saving attached
  messages.  This is symmetric for whole messages and for attached
  messages, though we special-case the whole message for performance
  reasons (and corner-case correctness reasons: given malformed input,
  GMime may not be able to reproduce it from the parsed
  representation).

- Multipart parts are printed with their headers and all child parts.
  It's not clear what the best thing to do for multipart is, but this
  was the most natural to implement and can be justified because such
  parts can't be interpreted without their headers.

As an added benefit, we can move the special-case code for part 0 into
the raw formatter.
---
 notmuch-show.c |  159 ++++++++++++++++++++++++--------------------------------
 test/multipart |   74 +++++++++++++++++---------
 2 files changed, 116 insertions(+), 117 deletions(-)

diff --git a/notmuch-show.c b/notmuch-show.c
index 6f6052c..8ed6896 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -20,9 +20,6 @@
 
 #include "notmuch-client.h"
 
-static void
-format_headers_message_part_text (GMimeMessage *message);
-
 static notmuch_status_t
 format_part_text (const void *ctx, mime_node_t *node,
 		  int indent, const notmuch_show_params_t *params);
@@ -56,23 +53,16 @@ static const notmuch_show_format_t format_mbox = {
     .message_set_end = ""
 };
 
-static void
-format_part_content_raw (GMimeObject *part);
+static notmuch_status_t
+format_part_raw (unused (const void *ctx), mime_node_t *node,
+		 unused (int indent),
+		 unused (const notmuch_show_params_t *params));
 
 static const notmuch_show_format_t format_raw = {
-    "", NULL,
-	"", NULL,
-	    "", NULL, format_headers_message_part_text, "\n",
-            "",
-                NULL,
-                NULL,
-                NULL,
-                format_part_content_raw,
-                NULL,
-                "",
-            "",
-	"", "",
-    ""
+    .message_set_start = "",
+    .part = format_part_raw,
+    .message_set_sep = "",
+    .message_set_end = ""
 };
 
 static const char *
@@ -210,27 +200,6 @@ _is_from_line (const char *line)
 }
 
 static void
-format_headers_message_part_text (GMimeMessage *message)
-{
-    InternetAddressList *recipients;
-    const char *recipients_string;
-
-    printf ("Subject: %s\n", g_mime_message_get_subject (message));
-    printf ("From: %s\n", g_mime_message_get_sender (message));
-    recipients = g_mime_message_get_recipients (message, GMIME_RECIPIENT_TYPE_TO);
-    recipients_string = internet_address_list_to_string (recipients, 0);
-    if (recipients_string)
-	printf ("To: %s\n",
-		recipients_string);
-    recipients = g_mime_message_get_recipients (message, GMIME_RECIPIENT_TYPE_CC);
-    recipients_string = internet_address_list_to_string (recipients, 0);
-    if (recipients_string)
-	printf ("Cc: %s\n",
-		recipients_string);
-    printf ("Date: %s\n", g_mime_message_get_date_as_string (message));
-}
-
-static void
 format_headers_json (const void *ctx, GMimeMessage *message)
 {
     void *local = talloc_new (ctx);
@@ -731,31 +700,82 @@ format_part_mbox (const void *ctx, mime_node_t *node, unused (int indent),
     return NOTMUCH_STATUS_SUCCESS;
 }
 
-static void
-format_part_content_raw (GMimeObject *part)
+static notmuch_status_t
+format_part_raw (unused (const void *ctx), mime_node_t *node,
+		 unused (int indent),
+		 unused (const notmuch_show_params_t *params))
 {
-    if (! GMIME_IS_PART (part))
-	return;
+    if (node->envelope_file) {
+	/* Special case the entire message to avoid MIME parsing. */
+	const char *filename;
+	FILE *file;
+	size_t size;
+	char buf[4096];
+
+	filename = notmuch_message_get_filename (node->envelope_file);
+	if (filename == NULL) {
+	    fprintf (stderr, "Error: Cannot get message filename.\n");
+	    return NOTMUCH_STATUS_FILE_ERROR;
+	}
+
+	file = fopen (filename, "r");
+	if (file == NULL) {
+	    fprintf (stderr, "Error: Cannot open file %s: %s\n", filename, strerror (errno));
+	    return NOTMUCH_STATUS_FILE_ERROR;
+	}
+
+	while (!feof (file)) {
+	    size = fread (buf, 1, sizeof (buf), file);
+	    if (ferror (file)) {
+		fprintf (stderr, "Error: Read failed from %s\n", filename);
+		fclose (file);
+		return NOTMUCH_STATUS_FILE_ERROR;
+	    }
+
+	    if (fwrite (buf, size, 1, stdout) != 1) {
+		fprintf (stderr, "Error: Write failed\n");
+		fclose (file);
+		return NOTMUCH_STATUS_FILE_ERROR;
+	    }
+	}
+
+	fclose (file);
+	return NOTMUCH_STATUS_SUCCESS;
+    }
 
     GMimeStream *stream_stdout;
     GMimeStream *stream_filter = NULL;
-    GMimeDataWrapper *wrapper;
 
     stream_stdout = g_mime_stream_file_new (stdout);
     g_mime_stream_file_set_owner (GMIME_STREAM_FILE (stream_stdout), FALSE);
 
     stream_filter = g_mime_stream_filter_new (stream_stdout);
 
-    wrapper = g_mime_part_get_content_object (GMIME_PART (part));
+    if (GMIME_IS_PART (node->part)) {
+	/* For leaf parts, we emit only the transfer-decoded
+	 * body. */
+	GMimeDataWrapper *wrapper;
+	wrapper = g_mime_part_get_content_object (GMIME_PART (node->part));
 
-    if (wrapper && stream_filter)
-	g_mime_data_wrapper_write_to_stream (wrapper, stream_filter);
+	if (wrapper && stream_filter)
+	    g_mime_data_wrapper_write_to_stream (wrapper, stream_filter);
+    } else {
+	/* Write out the whole part.  For message parts (the root
+	 * part and embedded message parts), this will be the
+	 * message including its headers (but not the
+	 * encapsulating part's headers).  For multipart parts,
+	 * this will include the headers. */
+	if (stream_filter)
+	    g_mime_object_write_to_stream (node->part, stream_filter);
+    }
 
     if (stream_filter)
 	g_object_unref (stream_filter);
 
     if (stream_stdout)
 	g_object_unref(stream_stdout);
+
+    return NOTMUCH_STATUS_SUCCESS;
 }
 
 static notmuch_status_t
@@ -891,50 +911,7 @@ do_show_single (void *ctx,
 
     notmuch_message_set_flag (message, NOTMUCH_MESSAGE_FLAG_MATCH, 1);
 
-    /* Special case for --format=raw of full single message, just cat out file */
-    if (params->raw && 0 == params->part) {
-
-	const char *filename;
-	FILE *file;
-	size_t size;
-	char buf[4096];
-
-	filename = notmuch_message_get_filename (message);
-	if (filename == NULL) {
-	    fprintf (stderr, "Error: Cannot message filename.\n");
-	    return 1;
-	}
-
-	file = fopen (filename, "r");
-	if (file == NULL) {
-	    fprintf (stderr, "Error: Cannot open file %s: %s\n", filename, strerror (errno));
-	    return 1;
-	}
-
-	while (!feof (file)) {
-	    size = fread (buf, 1, sizeof (buf), file);
-	    if (ferror (file)) {
-		fprintf (stderr, "Error: Read failed from %s\n", filename);
-		fclose (file);
-		return 1;
-	    }
-
-	    if (fwrite (buf, size, 1, stdout) != 1) {
-		fprintf (stderr, "Error: Write failed\n");
-		fclose (file);
-		return 1;
-	    }
-	}
-
-	fclose (file);
-
-	return 0;
-
-    } else {
-
-	return show_message (ctx, format, message, 0, params) != NOTMUCH_STATUS_SUCCESS;
-
-    }
+    return show_message (ctx, format, message, 0, params) != NOTMUCH_STATUS_SUCCESS;
 }
 
 /* Formatted output of threads */
diff --git a/test/multipart b/test/multipart
index 475c6a2..c1a5702 100755
--- a/test/multipart
+++ b/test/multipart
@@ -450,58 +450,80 @@ test_expect_equal_file OUTPUT "${MAIL_DIR}"/multipart
 
 test_begin_subtest "--format=raw --part=1, message body"
 notmuch show --format=raw --part=1 'id:87liy5ap00.fsf@yoom.home.cworth.org' >OUTPUT
-# output should *not* include newline
-echo >>OUTPUT
-cat <<EOF >EXPECTED
-Subject: html message
-From: Carl Worth <cworth@cworth.org>
-To: cworth@cworth.org
-Date: Fri, 05 Jan 2001 15:42:57 +0000
-
-<p>This is an embedded message, with a multipart/alternative part.</p>
-This is an embedded message, with a multipart/alternative part.
-This is a text attachment.
-And this message is signed.
-
--Carl
------BEGIN PGP SIGNATURE-----
-Version: GnuPG v1.4.11 (GNU/Linux)
-
-iEYEARECAAYFAk3SA/gACgkQ6JDdNq8qSWj0sACghqVJEQJUs3yV8zbTzhgnSIcD
-W6cAmQE4dcYrx/LPLtYLZm1jsGauE5hE
-=zkga
------END PGP SIGNATURE-----
-EOF
-test_expect_equal_file OUTPUT EXPECTED
+test_expect_equal_file OUTPUT "${MAIL_DIR}"/multipart
 
 test_begin_subtest "--format=raw --part=2, multipart/mixed"
 notmuch show --format=raw --part=2 'id:87liy5ap00.fsf@yoom.home.cworth.org' >OUTPUT
 cat <<EOF >EXPECTED
-Subject: html message
+Content-Type: multipart/mixed; boundary="=-=-="
+
+--=-=-=
+Content-Type: message/rfc822
+Content-Disposition: inline
+
 From: Carl Worth <cworth@cworth.org>
 To: cworth@cworth.org
+Subject: html message
 Date: Fri, 05 Jan 2001 15:42:57 +0000
+User-Agent: Notmuch/0.5 (http://notmuchmail.org) Emacs/23.3.1 (i486-pc-linux-gnu)
+Message-ID: <87liy5ap01.fsf@yoom.home.cworth.org>
+MIME-Version: 1.0
+Content-Type: multipart/alternative; boundary="==-=-=="
+
+--==-=-==
+Content-Type: text/html
 
 <p>This is an embedded message, with a multipart/alternative part.</p>
+
+--==-=-==
+Content-Type: text/plain
+
 This is an embedded message, with a multipart/alternative part.
+
+--==-=-==--
+
+--=-=-=
+Content-Disposition: attachment; filename=attachment
+
 This is a text attachment.
+
+--=-=-=
+
 And this message is signed.
 
 -Carl
+
+--=-=-=--
 EOF
 test_expect_equal_file OUTPUT EXPECTED
 
 test_begin_subtest "--format=raw --part=3, rfc822 part"
-test_subtest_known_broken
-
 notmuch show --format=raw --part=3 'id:87liy5ap00.fsf@yoom.home.cworth.org' >OUTPUT
 test_expect_equal_file OUTPUT embedded_message
 
 test_begin_subtest "--format=raw --part=4, rfc822's multipart"
 notmuch show --format=raw --part=4 'id:87liy5ap00.fsf@yoom.home.cworth.org' >OUTPUT
 cat <<EOF >EXPECTED
+From: Carl Worth <cworth@cworth.org>
+To: cworth@cworth.org
+Subject: html message
+Date: Fri, 05 Jan 2001 15:42:57 +0000
+User-Agent: Notmuch/0.5 (http://notmuchmail.org) Emacs/23.3.1 (i486-pc-linux-gnu)
+Message-ID: <87liy5ap01.fsf@yoom.home.cworth.org>
+MIME-Version: 1.0
+Content-Type: multipart/alternative; boundary="==-=-=="
+
+--==-=-==
+Content-Type: text/html
+
 <p>This is an embedded message, with a multipart/alternative part.</p>
+
+--==-=-==
+Content-Type: text/plain
+
 This is an embedded message, with a multipart/alternative part.
+
+--==-=-==--
 EOF
 test_expect_equal_file OUTPUT EXPECTED
 
-- 
1.7.7.3