lib: Internal support for querying and creating ghost messages

This updates the message abstraction to support ghost messages: it
adds a message flag that distinguishes regular messages from ghost
messages, and an internal function for initializing a newly created
(blank) message as a ghost message.

diff --git a/lib/message.cc b/lib/message.cc
index 55d2ff69fff4c479c2dfa4e430bb88bcfe441025..a7a13cc26aa181ec94f336048385403b903d4d37 100644 (file)
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -39,6 +39,9 @@ struct visible _notmuch_message {
     notmuch_message_file_t *message_file;
     notmuch_message_list_t *replies;
     unsigned long flags;
+    /* For flags that are initialized on-demand, lazy_flags indicates
+     * if each flag has been initialized. */
+    unsigned long lazy_flags;
 
     Xapian::Document doc;
     Xapian::termcount termpos;
@@ -99,6 +102,7 @@ _notmuch_message_create_for_document (const void *talloc_owner,
 
     message->frozen = 0;
     message->flags = 0;
+    message->lazy_flags = 0;
 
     /* Each of these will be lazily created as needed. */
     message->message_id = NULL;
@@ -192,7 +196,7 @@ _notmuch_message_create (const void *talloc_owner,
  *
  *     There is already a document with message ID 'message_id' in the
  *     database. The returned message can be used to query/modify the
- *     document.
+ *     document. The message may be a ghost message.
  *
  *   NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND:
  *
@@ -305,6 +309,7 @@ _notmuch_message_ensure_metadata (notmuch_message_t *message)
     const char *thread_prefix = _find_prefix ("thread"),
        *tag_prefix = _find_prefix ("tag"),
        *id_prefix = _find_prefix ("id"),
+       *type_prefix = _find_prefix ("type"),
        *filename_prefix = _find_prefix ("file-direntry"),
        *replyto_prefix = _find_prefix ("replyto");
 
@@ -337,10 +342,25 @@ _notmuch_message_ensure_metadata (notmuch_message_t *message)
        message->message_id =
            _notmuch_message_get_term (message, i, end, id_prefix);
 
+    /* Get document type */
+    assert (strcmp (id_prefix, type_prefix) < 0);
+    if (! NOTMUCH_TEST_BIT (message->lazy_flags, NOTMUCH_MESSAGE_FLAG_GHOST)) {
+       i.skip_to (type_prefix);
+       /* "T" is the prefix "type" fields.  See
+        * BOOLEAN_PREFIX_INTERNAL. */
+       if (*i == "Tmail")
+           NOTMUCH_CLEAR_BIT (&message->flags, NOTMUCH_MESSAGE_FLAG_GHOST);
+       else if (*i == "Tghost")
+           NOTMUCH_SET_BIT (&message->flags, NOTMUCH_MESSAGE_FLAG_GHOST);
+       else
+           INTERNAL_ERROR ("Message without type term");
+       NOTMUCH_SET_BIT (&message->lazy_flags, NOTMUCH_MESSAGE_FLAG_GHOST);
+    }
+
     /* Get filename list.  Here we get only the terms.  We lazily
      * expand them to full file names when needed in
      * _notmuch_message_ensure_filename_list. */
-    assert (strcmp (id_prefix, filename_prefix) < 0);
+    assert (strcmp (type_prefix, filename_prefix) < 0);
     if (!message->filename_term_list && !message->filename_list)
        message->filename_term_list =
            _notmuch_database_get_terms_with_prefix (message, i, end,
@@ -371,6 +391,11 @@ _notmuch_message_invalidate_metadata (notmuch_message_t *message,
        message->tag_list = NULL;
     }
 
+    if (strcmp ("type", prefix_name) == 0) {
+       NOTMUCH_CLEAR_BIT (&message->flags, NOTMUCH_MESSAGE_FLAG_GHOST);
+       NOTMUCH_CLEAR_BIT (&message->lazy_flags, NOTMUCH_MESSAGE_FLAG_GHOST);
+    }
+
     if (strcmp ("file-direntry", prefix_name) == 0) {
        talloc_free (message->filename_term_list);
        talloc_free (message->filename_list);
@@ -869,6 +894,10 @@ notmuch_bool_t
 notmuch_message_get_flag (notmuch_message_t *message,
                          notmuch_message_flag_t flag)
 {
+    if (flag == NOTMUCH_MESSAGE_FLAG_GHOST &&
+       ! NOTMUCH_TEST_BIT (message->lazy_flags, flag))
+       _notmuch_message_ensure_metadata (message);
+
     return NOTMUCH_TEST_BIT (message->flags, flag);
 }
 
@@ -880,6 +909,7 @@ notmuch_message_set_flag (notmuch_message_t *message,
        NOTMUCH_SET_BIT (&message->flags, flag);
     else
        NOTMUCH_CLEAR_BIT (&message->flags, flag);
+    NOTMUCH_SET_BIT (&message->lazy_flags, flag);
 }
 
 time_t
@@ -989,6 +1019,24 @@ _notmuch_message_delete (notmuch_message_t *message)
     return NOTMUCH_STATUS_SUCCESS;
 }
 
+/* Transform a blank message into a ghost message.  The caller must
+ * _notmuch_message_sync the message. */
+notmuch_private_status_t
+_notmuch_message_initialize_ghost (notmuch_message_t *message,
+                                  const char *thread_id)
+{
+    notmuch_private_status_t status;
+
+    status = _notmuch_message_add_term (message, "type", "ghost");
+    if (status)
+       return status;
+    status = _notmuch_message_add_term (message, "thread", thread_id);
+    if (status)
+       return status;
+
+    return NOTMUCH_PRIVATE_STATUS_SUCCESS;
+}
+
 /* Ensure that 'message' is not holding any file object open. Future
  * calls to various functions will still automatically open the
  * message file as needed.

diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
index b86897c2031195a6bfa9d85ab4a5602204335315..012ad25c42cd3845588f9e2cee0b9d4a631900f7 100644 (file)
--- a/lib/notmuch-private.h
+++ b/lib/notmuch-private.h
@@ -308,6 +308,10 @@ _notmuch_message_sync (notmuch_message_t *message);
 notmuch_status_t
 _notmuch_message_delete (notmuch_message_t *message);
 
+notmuch_private_status_t
+_notmuch_message_initialize_ghost (notmuch_message_t *message,
+                                  const char *thread_id);
+
 void
 _notmuch_message_close (notmuch_message_t *message);
 

diff --git a/lib/notmuch.h b/lib/notmuch.h
index dae041640fdb2abb9d0a53e4d69540d2bdbf6054..92594b9dad9e4110e41ca29ef82266d6be821426 100644 (file)
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -1221,7 +1221,14 @@ notmuch_message_get_filenames (notmuch_message_t *message);
  */
 typedef enum _notmuch_message_flag {
     NOTMUCH_MESSAGE_FLAG_MATCH,
-    NOTMUCH_MESSAGE_FLAG_EXCLUDED
+    NOTMUCH_MESSAGE_FLAG_EXCLUDED,
+
+    /* This message is a "ghost message", meaning it has no filenames
+     * or content, but we know it exists because it was referenced by
+     * some other message.  A ghost message has only a message ID and
+     * thread ID.
+     */
+    NOTMUCH_MESSAGE_FLAG_GHOST,
 } notmuch_message_flag_t;
 
 /**