lib: Add new, public notmuch_message_get_filenames

This augments the existing notmuch_message_get_filename by allowing
the caller access to all filenames in the case of multiple files for a
single message.

To support this, we split the iterator (notmuch_filenames_t) away from
the list storage (notmuch_filename_list_t) where previously these were
a single object (notmuch_filenames_t). Then, whenever the user asks
for a file or filename, the message object lazily creates a complete
notmuch_filename_list_t and then:

	For notmuch_message_get_filename, returns the first filename
	in the list.

	For notmuch_message_get_filenames, creates and returns a new
	iterator for the filename list.

1 files changed, 14 insertions, 1 deletions

diff --git a/lib/notmuch.h b/lib/notmuch.h
index b15f1249..413b5709 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -772,11 +772,24 @@ notmuch_message_get_replies (notmuch_message_t *message);
  * Note: If this message corresponds to multiple files in the mail
  * store, (that is, multiple files contain identical message IDs),
  * this function will arbitrarily return a single one of those
- * filenames.
+ * filenames. See notmuch_message_get_filenames for returning the
+ * complete list of filenames.
  */
 const char *
 notmuch_message_get_filename (notmuch_message_t *message);
 
+/* Get all filenames for the email corresponding to 'message'.
+ *
+ * Returns a notmuch_filenames_t iterator listing all the filenames
+ * associated with 'message'. These files may not have identical
+ * content, but each will have the identical Message-ID.
+ *
+ * Each filename in the iterator is an absolute filename, (the initial
+ * component will match notmuch_database_get_path() ).
+ */
+notmuch_filenames_t *
+notmuch_message_get_filenames (notmuch_message_t *message);
+
 /* Message flags */
 typedef enum _notmuch_message_flag {
     NOTMUCH_MESSAGE_FLAG_MATCH