EMailParserExtension: Collect EMailParts in a GQueue.

Collect EMailParts in a GQueue provided to the EMailParserExtension,
and change the return type of parse() to gboolean to indicate whether
the given CamelMimePart was handled (even if no parts were added to
the output GQueue).

This avoids the awkward corner case of a parser extension returning a
linked list node with a NULL data member to indicate the CamelMimePart
was handled but no EMailParts produced, and then having to watch out
for that NULL data member corner case throughout the application.

Also, remove the GCancellable parameter from e_mail_parser_error() and
e_mail_parser_wrap_as_attachment() since neither function blocks.

1 files changed, 10 insertions, 7 deletions

diff --git a/modules/itip-formatter/e-mail-parser-itip.c b/modules/itip-formatter/e-mail-parser-itip.c
index 56bbd53da1..505842807a 100644
--- a/modules/itip-formatter/e-mail-parser-itip.c
+++ b/modules/itip-formatter/e-mail-parser-itip.c
@@ -180,12 +180,13 @@ bind_itip_view (EMailPart *part,
 
 /*******************************************************************************/
 
-static GSList *
+static gboolean
 empe_itip_parse (EMailParserExtension *extension,
                  EMailParser *parser,
                  CamelMimePart *part,
                  GString *part_id,
-                 GCancellable *cancellable)
+                 GCancellable *cancellable,
+                 GQueue *out_mail_parts)
 {
 	EShell *shell;
 	GSettings *settings;
@@ -195,7 +196,7 @@ empe_itip_parse (EMailParserExtension *extension,
 	GByteArray *byte_array;
 	gint len;
 	const CamelContentDisposition *disposition;
-	GSList *parts;
+	GQueue work_queue = G_QUEUE_INIT;
 
 	len = part_id->len;
 	g_string_append_printf (part_id, ".itip");
@@ -234,18 +235,20 @@ empe_itip_parse (EMailParserExtension *extension,
 
 	g_object_unref (stream);
 
-	parts = g_slist_append (NULL, itip_part);
+	g_queue_push_tail (&work_queue, itip_part);
 
 	disposition = camel_mime_part_get_content_disposition (part);
 	if (disposition &&
 	    (g_strcmp0 (disposition->disposition, "attachment") == 0)) {
-		parts = e_mail_parser_wrap_as_attachment (
-			parser, part, parts, part_id, cancellable);
+		e_mail_parser_wrap_as_attachment (
+			parser, part, part_id, &work_queue);
 	}
 
+	e_queue_transfer (&work_queue, out_mail_parts);
+
 	g_string_truncate (part_id, len);
 
-	return parts;
+	return TRUE;
 }
 
 static guint32