X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=lib%2Fmessage.cc;h=d5db89b6606c7da011c2a80c5ce460f769f32650;hp=bacb4d46a0c1aa336a91e3b76b65097b1b1884c5;hb=6a9626a2fdddf6115bcf97982fd10053bf48e942;hpb=3d978a0d61df072de7e4fd52120f3448cf8e9df6

diff --git a/lib/message.cc b/lib/message.cc
index bacb4d46..d5db89b6 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -13,19 +13,20 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see http://www.gnu.org/licenses/ .
+ * along with this program.  If not, see https://www.gnu.org/licenses/ .
  *
  * Author: Carl Worth <cworth@cworth.org>
  */
 
 #include "notmuch-private.h"
 #include "database-private.h"
+#include "message-private.h"
 
 #include <stdint.h>
 
 #include <gmime/gmime.h>
 
-struct visible _notmuch_message {
+struct _notmuch_message {
     notmuch_database_t *notmuch;
     Xapian::docid doc_id;
     int frozen;
@@ -35,14 +36,23 @@ struct visible _notmuch_message {
     notmuch_string_list_t *tag_list;
     notmuch_string_list_t *filename_term_list;
     notmuch_string_list_t *filename_list;
+    char *maildir_flags;
     char *author;
     notmuch_message_file_t *message_file;
+    notmuch_string_list_t *property_term_list;
+    notmuch_string_map_t *property_map;
     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;
 
+    /* Message document modified since last sync */
+    bool modified;
+
+    /* last view of database the struct is synced with */
+    unsigned long last_view;
+
     Xapian::Document doc;
     Xapian::termcount termpos;
 };
@@ -52,16 +62,16 @@ struct visible _notmuch_message {
 struct maildir_flag_tag {
     char flag;
     const char *tag;
-    notmuch_bool_t inverse;
+    bool inverse;
 };
 
 /* ASCII ordered table of Maildir flags and associated tags */
 static struct maildir_flag_tag flag2tag[] = {
-    { 'D', "draft",   FALSE},
-    { 'F', "flagged", FALSE},
-    { 'P', "passed",  FALSE},
-    { 'R', "replied", FALSE},
-    { 'S', "unread",  TRUE }
+    { 'D', "draft",   false},
+    { 'F', "flagged", false},
+    { 'P', "passed",  false},
+    { 'R', "replied", false},
+    { 'S', "unread",  true }
 };
 
 /* We end up having to call the destructor explicitly because we had
@@ -104,6 +114,9 @@ _notmuch_message_create_for_document (const void *talloc_owner,
     message->flags = 0;
     message->lazy_flags = 0;
 
+    /* the message is initially not synchronized with Xapian */
+    message->last_view = 0;
+
     /* Each of these will be lazily created as needed. */
     message->message_id = NULL;
     message->thread_id = NULL;
@@ -111,8 +124,11 @@ _notmuch_message_create_for_document (const void *talloc_owner,
     message->tag_list = NULL;
     message->filename_term_list = NULL;
     message->filename_list = NULL;
+    message->maildir_flags = NULL;
     message->message_file = NULL;
     message->author = NULL;
+    message->property_term_list = NULL;
+    message->property_map = NULL;
 
     message->replies = _notmuch_message_list_create (message);
     if (unlikely (message->replies == NULL)) {
@@ -252,9 +268,9 @@ _notmuch_message_create_for_message_id (notmuch_database_t *notmuch,
 
 	doc_id = _notmuch_database_generate_doc_id (notmuch);
     } catch (const Xapian::Error &error) {
-	fprintf (stderr, "A Xapian exception occurred creating message: %s\n",
+	_notmuch_database_log(_notmuch_message_database (message), "A Xapian exception occurred creating message: %s\n",
 		 error.get_msg().c_str());
-	notmuch->exception_reported = TRUE;
+	notmuch->exception_reported = true;
 	*status_ret = NOTMUCH_PRIVATE_STATUS_XAPIAN_EXCEPTION;
 	return NULL;
     }
@@ -283,7 +299,7 @@ _notmuch_message_get_term (notmuch_message_t *message,
     if (i == end)
 	return NULL;
 
-    std::string term = *i;
+    const std::string &term = *i;
     if (strncmp (term.c_str(), prefix, prefix_len))
 	return NULL;
 
@@ -302,15 +318,20 @@ _notmuch_message_get_term (notmuch_message_t *message,
     return value;
 }
 
-void
-_notmuch_message_ensure_metadata (notmuch_message_t *message)
+static void
+_notmuch_message_ensure_metadata (notmuch_message_t *message, void *field)
 {
     Xapian::TermIterator i, end;
+
+    if (field && (message->last_view >= message->notmuch->view))
+	return;
+
     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"),
+	*property_prefix = _find_prefix ("property"),
 	*replyto_prefix = _find_prefix ("replyto");
 
     /* We do this all in a single pass because Xapian decompresses the
@@ -318,66 +339,91 @@ _notmuch_message_ensure_metadata (notmuch_message_t *message)
      * slightly more costly than looking up individual fields if only
      * one field of the message object is actually used, it's a huge
      * win as more fields are used. */
+    for (int count=0; count < 3; count++) {
+	try {
+	    i = message->doc.termlist_begin ();
+	    end = message->doc.termlist_end ();
+
+	    /* Get thread */
+	    if (!message->thread_id)
+		message->thread_id =
+		    _notmuch_message_get_term (message, i, end, thread_prefix);
+
+	    /* Get tags */
+	    assert (strcmp (thread_prefix, tag_prefix) < 0);
+	    if (!message->tag_list) {
+		message->tag_list =
+		    _notmuch_database_get_terms_with_prefix (message, i, end,
+							     tag_prefix);
+		_notmuch_string_list_sort (message->tag_list);
+	    }
 
-    i = message->doc.termlist_begin ();
-    end = message->doc.termlist_end ();
+	    /* Get id */
+	    assert (strcmp (tag_prefix, id_prefix) < 0);
+	    if (!message->message_id)
+		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 thread */
-    if (!message->thread_id)
-	message->thread_id =
-	    _notmuch_message_get_term (message, i, end, thread_prefix);
-
-    /* Get tags */
-    assert (strcmp (thread_prefix, tag_prefix) < 0);
-    if (!message->tag_list) {
-	message->tag_list =
-	    _notmuch_database_get_terms_with_prefix (message, i, end,
-						     tag_prefix);
-	_notmuch_string_list_sort (message->tag_list);
-    }
+	    /* 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 (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,
+							     filename_prefix);
+
+
+	    /* Get property terms. Mimic the setup with filenames above */
+	    assert (strcmp (filename_prefix, property_prefix) < 0);
+	    if (!message->property_map && !message->property_term_list)
+		message->property_term_list =
+		    _notmuch_database_get_terms_with_prefix (message, i, end,
+							 property_prefix);
+
+	    /* Get reply to */
+	    assert (strcmp (property_prefix, replyto_prefix) < 0);
+	    if (!message->in_reply_to)
+		message->in_reply_to =
+		    _notmuch_message_get_term (message, i, end, replyto_prefix);
 
-    /* Get id */
-    assert (strcmp (tag_prefix, id_prefix) < 0);
-    if (!message->message_id)
-	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 (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,
-						     filename_prefix);
-
-    /* Get reply to */
-    assert (strcmp (filename_prefix, replyto_prefix) < 0);
-    if (!message->in_reply_to)
-	message->in_reply_to =
-	    _notmuch_message_get_term (message, i, end, replyto_prefix);
-    /* It's perfectly valid for a message to have no In-Reply-To
-     * header. For these cases, we return an empty string. */
-    if (!message->in_reply_to)
-	message->in_reply_to = talloc_strdup (message, "");
+	    /* It's perfectly valid for a message to have no In-Reply-To
+	     * header. For these cases, we return an empty string. */
+	    if (!message->in_reply_to)
+		message->in_reply_to = talloc_strdup (message, "");
+
+	    /* all the way without an exception */
+	    break;
+	} catch (const Xapian::DatabaseModifiedError &error) {
+	    notmuch_status_t status = _notmuch_database_reopen (message->notmuch);
+	    if (status != NOTMUCH_STATUS_SUCCESS)
+		INTERNAL_ERROR ("unhandled error from notmuch_database_reopen: %s\n",
+				notmuch_status_to_string (status));
+	} catch (const Xapian::Error &error) {
+	    INTERNAL_ERROR ("A Xapian exception occurred fetching message metadata: %s\n",
+			    error.get_msg().c_str());
+	}
+    }
+    message->last_view = message->notmuch->view;
 }
 
-static void
+void
 _notmuch_message_invalidate_metadata (notmuch_message_t *message,
 				      const char *prefix_name)
 {
@@ -402,6 +448,18 @@ _notmuch_message_invalidate_metadata (notmuch_message_t *message,
 	message->filename_term_list = message->filename_list = NULL;
     }
 
+    if (strcmp ("property", prefix_name) == 0) {
+
+	if (message->property_term_list)
+	    talloc_free (message->property_term_list);
+	message->property_term_list = NULL;
+
+	if (message->property_map)
+	    talloc_unlink (message, message->property_map);
+
+	message->property_map = NULL;
+    }
+
     if (strcmp ("replyto", prefix_name) == 0) {
 	talloc_free (message->in_reply_to);
 	message->in_reply_to = NULL;
@@ -417,8 +475,7 @@ _notmuch_message_get_doc_id (notmuch_message_t *message)
 const char *
 notmuch_message_get_message_id (notmuch_message_t *message)
 {
-    if (!message->message_id)
-	_notmuch_message_ensure_metadata (message);
+    _notmuch_message_ensure_metadata (message, message->message_id);
     if (!message->message_id)
 	INTERNAL_ERROR ("Message with document ID of %u has no message ID.\n",
 			message->doc_id);
@@ -437,7 +494,8 @@ _notmuch_message_ensure_message_file (notmuch_message_t *message)
     if (unlikely (filename == NULL))
 	return;
 
-    message->message_file = _notmuch_message_file_open_ctx (message, filename);
+    message->message_file = _notmuch_message_file_open_ctx (
+	_notmuch_message_database (message), message, filename);
 }
 
 const char *
@@ -467,9 +525,9 @@ notmuch_message_get_header (notmuch_message_t *message, const char *header)
 		return talloc_strdup (message, value.c_str ());
 
 	} catch (Xapian::Error &error) {
-	    fprintf (stderr, "A Xapian exception occurred when reading header: %s\n",
+	    _notmuch_database_log(_notmuch_message_database (message), "A Xapian exception occurred when reading header: %s\n",
 		     error.get_msg().c_str());
-	    message->notmuch->exception_reported = TRUE;
+	    message->notmuch->exception_reported = true;
 	    return NULL;
 	}
     }
@@ -492,16 +550,14 @@ notmuch_message_get_header (notmuch_message_t *message, const char *header)
 const char *
 _notmuch_message_get_in_reply_to (notmuch_message_t *message)
 {
-    if (!message->in_reply_to)
-	_notmuch_message_ensure_metadata (message);
+    _notmuch_message_ensure_metadata (message, message->in_reply_to);
     return message->in_reply_to;
 }
 
 const char *
 notmuch_message_get_thread_id (notmuch_message_t *message)
 {
-    if (!message->thread_id)
-	_notmuch_message_ensure_metadata (message);
+    _notmuch_message_ensure_metadata (message, message->thread_id);
     if (!message->thread_id)
 	INTERNAL_ERROR ("Message with document ID of %u has no thread ID.\n",
 			message->doc_id);
@@ -521,11 +577,13 @@ notmuch_message_get_replies (notmuch_message_t *message)
     return _notmuch_messages_create (message->replies);
 }
 
-static void
+void
 _notmuch_message_remove_terms (notmuch_message_t *message, const char *prefix)
 {
     Xapian::TermIterator i;
-    size_t prefix_len = strlen (prefix);
+    size_t prefix_len = 0;
+
+    prefix_len = strlen (prefix);
 
     while (1) {
 	i = message->doc.termlist_begin ();
@@ -538,10 +596,64 @@ _notmuch_message_remove_terms (notmuch_message_t *message, const char *prefix)
 
 	try {
 	    message->doc.remove_term ((*i));
+	    message->modified = true;
+	} catch (const Xapian::InvalidArgumentError) {
+	    /* Ignore failure to remove non-existent term. */
+	}
+    }
+}
+
+
+/* Remove all terms generated by indexing, i.e. not tags or
+ * properties, along with any automatic tags*/
+notmuch_private_status_t
+_notmuch_message_remove_indexed_terms (notmuch_message_t *message)
+{
+    Xapian::TermIterator i;
+
+    const std::string
+	id_prefix = _find_prefix ("id"),
+	property_prefix = _find_prefix ("property"),
+	tag_prefix = _find_prefix ("tag"),
+	type_prefix = _find_prefix ("type");
+
+    for (i = message->doc.termlist_begin ();
+	 i != message->doc.termlist_end (); i++) {
+
+	const std::string term = *i;
+
+	if (term.compare (0, type_prefix.size (), type_prefix) == 0)
+	    continue;
+
+	if (term.compare (0, id_prefix.size (), id_prefix) == 0)
+	    continue;
+
+	if (term.compare (0, property_prefix.size (), property_prefix) == 0)
+	    continue;
+
+	if (term.compare (0, tag_prefix.size (), tag_prefix) == 0 &&
+	    term.compare (1, strlen("encrypted"), "encrypted") != 0 &&
+	    term.compare (1, strlen("signed"), "signed") != 0 &&
+	    term.compare (1, strlen("attachment"), "attachment") != 0)
+	    continue;
+
+	try {
+	    message->doc.remove_term ((*i));
+	    message->modified = true;
 	} catch (const Xapian::InvalidArgumentError) {
 	    /* Ignore failure to remove non-existent term. */
+	} catch (const Xapian::Error &error) {
+	    notmuch_database_t *notmuch = message->notmuch;
+
+	    if (!notmuch->exception_reported) {
+		_notmuch_database_log(_notmuch_message_database (message), "A Xapian exception occurred creating message: %s\n",
+				      error.get_msg().c_str());
+		notmuch->exception_reported = true;
+	    }
+	    return NOTMUCH_PRIVATE_STATUS_XAPIAN_EXCEPTION;
 	}
     }
+    return NOTMUCH_PRIVATE_STATUS_SUCCESS;
 }
 
 /* Return true if p points at "new" or "cur". */
@@ -591,6 +703,7 @@ _notmuch_message_add_folder_terms (notmuch_message_t *message,
 
     talloc_free (folder);
 
+    message->modified = true;
     return NOTMUCH_STATUS_SUCCESS;
 }
 
@@ -641,7 +754,7 @@ _notmuch_message_add_directory_terms (void *ctx, notmuch_message_t *message)
 	unsigned int directory_id;
 	const char *direntry, *directory;
 	char *colon;
-	const std::string term = *i;
+	const std::string &term = *i;
 
 	/* Terminate loop at first term without desired prefix. */
 	if (strncmp (term.c_str (), direntry_prefix, direntry_prefix_len))
@@ -723,7 +836,7 @@ _notmuch_message_add_filename (notmuch_message_t *message,
  * Note: This function does not remove a document from the database,
  * even if the specified filename is the only filename for this
  * message. For that functionality, see
- * _notmuch_database_remove_message. */
+ * notmuch_database_remove_message. */
 notmuch_status_t
 _notmuch_message_remove_filename (notmuch_message_t *message,
 				  const char *filename)
@@ -792,6 +905,7 @@ void
 _notmuch_message_clear_data (notmuch_message_t *message)
 {
     message->doc.set_data ("");
+    message->modified = true;
 }
 
 static void
@@ -802,8 +916,7 @@ _notmuch_message_ensure_filename_list (notmuch_message_t *message)
     if (message->filename_list)
 	return;
 
-    if (!message->filename_term_list)
-	_notmuch_message_ensure_metadata (message);
+    _notmuch_message_ensure_metadata (message, message->filename_term_list);
 
     message->filename_list = _notmuch_string_list_create (message);
     node = message->filename_term_list->head;
@@ -815,9 +928,9 @@ _notmuch_message_ensure_filename_list (notmuch_message_t *message)
 	 *
 	 * It would be nice to do the upgrade of the document directly
 	 * here, but the database is likely open in read-only mode. */
-	const char *data;
 
-	data = message->doc.get_data ().c_str ();
+	std::string datastr = message->doc.get_data ();
+	const char *data = datastr.c_str ();
 
 	if (data == NULL)
 	    INTERNAL_ERROR ("message with no filename");
@@ -891,13 +1004,21 @@ notmuch_message_get_filenames (notmuch_message_t *message)
     return _notmuch_filenames_create (message, message->filename_list);
 }
 
+int
+notmuch_message_count_files (notmuch_message_t *message)
+{
+    _notmuch_message_ensure_filename_list (message);
+
+    return _notmuch_string_list_length (message->filename_list);
+}
+
 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);
+	_notmuch_message_ensure_metadata (message, NULL);
 
     return NOTMUCH_TEST_BIT (message->flags, flag);
 }
@@ -921,9 +1042,9 @@ notmuch_message_get_date (notmuch_message_t *message)
     try {
 	value = message->doc.get_value (NOTMUCH_VALUE_TIMESTAMP);
     } catch (Xapian::Error &error) {
-	fprintf (stderr, "A Xapian exception occurred when reading date: %s\n",
+	_notmuch_database_log(_notmuch_message_database (message), "A Xapian exception occurred when reading date: %s\n",
 		 error.get_msg().c_str());
-	message->notmuch->exception_reported = TRUE;
+	message->notmuch->exception_reported = true;
 	return 0;
     }
 
@@ -938,8 +1059,7 @@ notmuch_message_get_tags (notmuch_message_t *message)
 {
     notmuch_tags_t *tags;
 
-    if (!message->tag_list)
-	_notmuch_message_ensure_metadata (message);
+    _notmuch_message_ensure_metadata (message, message->tag_list);
 
     tags = _notmuch_tags_create (message, message->tag_list);
     /* _notmuch_tags_create steals the reference to the tag_list, but
@@ -980,15 +1100,32 @@ _notmuch_message_set_header_values (notmuch_message_t *message,
 
     /* GMime really doesn't want to see a NULL date, so protect its
      * sensibilities. */
-    if (date == NULL || *date == '\0')
+    if (date == NULL || *date == '\0') {
 	time_value = 0;
-    else
-	time_value = g_mime_utils_header_decode_date (date, NULL);
+    } else {
+	time_value = g_mime_utils_header_decode_date_unix (date);
+	/*
+	 * Workaround for https://bugzilla.gnome.org/show_bug.cgi?id=779923
+	 */
+	if (time_value < 0)
+	    time_value = 0;
+    }
 
     message->doc.add_value (NOTMUCH_VALUE_TIMESTAMP,
 			    Xapian::sortable_serialise (time_value));
     message->doc.add_value (NOTMUCH_VALUE_FROM, from);
     message->doc.add_value (NOTMUCH_VALUE_SUBJECT, subject);
+    message->modified = true;
+}
+
+/* Upgrade a message to support NOTMUCH_FEATURE_LAST_MOD.  The caller
+ * must call _notmuch_message_sync. */
+void
+_notmuch_message_upgrade_last_mod (notmuch_message_t *message)
+{
+    /* _notmuch_message_sync will update the last modification
+     * revision; we just have to ask it to. */
+    message->modified = true;
 }
 
 /* Synchronize changes made to message->doc out into the database. */
@@ -1000,24 +1137,110 @@ _notmuch_message_sync (notmuch_message_t *message)
     if (message->notmuch->mode == NOTMUCH_DATABASE_MODE_READ_ONLY)
 	return;
 
+    if (! message->modified)
+	return;
+
+    /* Update the last modification of this message. */
+    if (message->notmuch->features & NOTMUCH_FEATURE_LAST_MOD)
+	/* sortable_serialise gives a reasonably compact encoding,
+	 * which directly translates to reduced IO when scanning the
+	 * value stream.  Since it's built for doubles, we only get 53
+	 * effective bits, but that's still enough for the database to
+	 * last a few centuries at 1 million revisions per second. */
+	message->doc.add_value (NOTMUCH_VALUE_LAST_MOD,
+				Xapian::sortable_serialise (
+				    _notmuch_database_new_revision (
+					message->notmuch)));
+
     db = static_cast <Xapian::WritableDatabase *> (message->notmuch->xapian_db);
     db->replace_document (message->doc_id, message->doc);
+    message->modified = false;
 }
 
-/* Delete a message document from the database. */
+/* Delete a message document from the database, leaving a ghost
+ * message in its place */
 notmuch_status_t
 _notmuch_message_delete (notmuch_message_t *message)
 {
     notmuch_status_t status;
     Xapian::WritableDatabase *db;
+    const char *mid, *tid, *query_string;
+    notmuch_message_t *ghost;
+    notmuch_private_status_t private_status;
+    notmuch_database_t *notmuch;
+    notmuch_query_t *query;
+    unsigned int count = 0;
+    bool is_ghost;
+
+    mid = notmuch_message_get_message_id (message);
+    tid = notmuch_message_get_thread_id (message);
+    notmuch = message->notmuch;
 
     status = _notmuch_database_ensure_writable (message->notmuch);
     if (status)
 	return status;
 
-    db = static_cast <Xapian::WritableDatabase *> (message->notmuch->xapian_db);
+    db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
     db->delete_document (message->doc_id);
-    return NOTMUCH_STATUS_SUCCESS;
+
+    /* if this was a ghost to begin with, we are done */
+    private_status = _notmuch_message_has_term (message, "type", "ghost", &is_ghost);
+    if (private_status)
+	return COERCE_STATUS (private_status,
+			      "Error trying to determine whether message was a ghost");
+    if (is_ghost)
+	return NOTMUCH_STATUS_SUCCESS;
+
+    query_string = talloc_asprintf (message, "thread:%s", tid);
+    query = notmuch_query_create (notmuch, query_string);
+    if (query == NULL)
+	return NOTMUCH_STATUS_OUT_OF_MEMORY;
+    status = notmuch_query_count_messages (query, &count);
+    if (status) {
+	notmuch_query_destroy (query);
+	return status;
+    }
+
+    if (count > 0) {
+	/* reintroduce a ghost in its place because there are still
+	 * other active messages in this thread: */
+	ghost = _notmuch_message_create_for_message_id (notmuch, mid, &private_status);
+	if (private_status == NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND) {
+	    private_status = _notmuch_message_initialize_ghost (ghost, tid);
+	    if (! private_status)
+		_notmuch_message_sync (ghost);
+	} else if (private_status == NOTMUCH_PRIVATE_STATUS_SUCCESS) {
+	    /* this is deeply weird, and we should not have gotten
+	       into this state.  is there a better error message to
+	       return here? */
+	    status = NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID;
+	}
+
+	notmuch_message_destroy (ghost);
+	status = COERCE_STATUS (private_status, "Error converting to ghost message");
+    } else {
+	/* the thread is empty; drop all ghost messages from it */
+	notmuch_messages_t *messages;
+	status = _notmuch_query_search_documents (query,
+						  "ghost",
+						  &messages);
+	if (status == NOTMUCH_STATUS_SUCCESS) {
+	    notmuch_status_t last_error = NOTMUCH_STATUS_SUCCESS;
+	    while (notmuch_messages_valid (messages)) {
+		message = notmuch_messages_get (messages);
+		status = _notmuch_message_delete (message);
+		if (status) /* we'll report the last failure we see;
+			     * if there is more than one failure, we
+			     * forget about previous ones */
+		    last_error = status;
+		notmuch_message_destroy (message);
+		notmuch_messages_move_to_next (messages);
+	    }
+	    status = last_error;
+	}
+    }
+    notmuch_query_destroy (query);
+    return status;
 }
 
 /* Transform a blank message into a ghost message.  The caller must
@@ -1076,6 +1299,7 @@ _notmuch_message_add_term (notmuch_message_t *message,
 	return NOTMUCH_PRIVATE_STATUS_TERM_TOO_LONG;
 
     message->doc.add_term (term, 0);
+    message->modified = true;
 
     talloc_free (term);
 
@@ -1144,8 +1368,9 @@ _notmuch_message_remove_term (notmuch_message_t *message,
 
     try {
 	message->doc.remove_term (term);
+	message->modified = true;
     } catch (const Xapian::InvalidArgumentError) {
-	/* We'll let the philosopher's try to wrestle with the
+	/* We'll let the philosophers try to wrestle with the
 	 * question of whether failing to remove that which was not
 	 * there in the first place is failure. For us, we'll silently
 	 * consider it all good. */
@@ -1158,6 +1383,41 @@ _notmuch_message_remove_term (notmuch_message_t *message,
     return NOTMUCH_PRIVATE_STATUS_SUCCESS;
 }
 
+notmuch_private_status_t
+_notmuch_message_has_term (notmuch_message_t *message,
+			   const char *prefix_name,
+			   const char *value,
+			   bool *result)
+{
+    char *term;
+    bool out = false;
+    notmuch_private_status_t status = NOTMUCH_PRIVATE_STATUS_SUCCESS;
+
+    if (value == NULL)
+	return NOTMUCH_PRIVATE_STATUS_NULL_POINTER;
+
+    term = talloc_asprintf (message, "%s%s",
+			    _find_prefix (prefix_name), value);
+
+    if (strlen (term) > NOTMUCH_TERM_MAX)
+	return NOTMUCH_PRIVATE_STATUS_TERM_TOO_LONG;
+
+    try {
+	/* Look for the exact term */
+	Xapian::TermIterator i = message->doc.termlist_begin ();
+	i.skip_to (term);
+	if (i != message->doc.termlist_end () &&
+	    !strcmp ((*i).c_str (), term))
+	    out = true;
+    } catch (Xapian::Error &error) {
+	status = NOTMUCH_PRIVATE_STATUS_XAPIAN_EXCEPTION;
+    }
+    talloc_free (term);
+
+    *result = out;
+    return status;
+}
+
 notmuch_status_t
 notmuch_message_add_tag (notmuch_message_t *message, const char *tag)
 {
@@ -1255,17 +1515,22 @@ _filename_is_in_maildir (const char *filename)
     return NULL;
 }
 
-notmuch_status_t
-notmuch_message_maildir_flags_to_tags (notmuch_message_t *message)
+static void
+_ensure_maildir_flags (notmuch_message_t *message, bool force)
 {
     const char *flags;
-    notmuch_status_t status;
     notmuch_filenames_t *filenames;
     const char *filename, *dir;
     char *combined_flags = talloc_strdup (message, "");
-    unsigned i;
     int seen_maildir_info = 0;
 
+    if (message->maildir_flags) {
+	if (force) {
+	    talloc_free (message->maildir_flags);
+	    message->maildir_flags = NULL;
+	}
+    }
+
     for (filenames = notmuch_message_get_filenames (message);
 	 notmuch_filenames_valid (filenames);
 	 notmuch_filenames_move_to_next (filenames))
@@ -1291,11 +1556,28 @@ notmuch_message_maildir_flags_to_tags (notmuch_message_t *message)
 	    seen_maildir_info = 1;
 	}
     }
+    if (seen_maildir_info)
+	message->maildir_flags = combined_flags;
+}
 
+notmuch_bool_t
+notmuch_message_has_maildir_flag (notmuch_message_t *message, char flag)
+{
+    _ensure_maildir_flags (message, false);
+    return message->maildir_flags && (strchr (message->maildir_flags, flag) != NULL);
+}
+
+notmuch_status_t
+notmuch_message_maildir_flags_to_tags (notmuch_message_t *message)
+{
+    notmuch_status_t status;
+    unsigned i;
+
+    _ensure_maildir_flags (message, true);
     /* If none of the filenames have any maildir info field (not even
      * an empty info with no flags set) then there's no information to
      * go on, so do nothing. */
-    if (! seen_maildir_info)
+    if (! message->maildir_flags)
 	return NOTMUCH_STATUS_SUCCESS;
 
     status = notmuch_message_freeze (message);
@@ -1303,8 +1585,8 @@ notmuch_message_maildir_flags_to_tags (notmuch_message_t *message)
 	return status;
 
     for (i = 0; i < ARRAY_SIZE(flag2tag); i++) {
-	if ((strchr (combined_flags, flag2tag[i].flag) != NULL)
-	    ^ 
+	if ((strchr (message->maildir_flags, flag2tag[i].flag) != NULL)
+	    ^
 	    flag2tag[i].inverse)
 	{
 	    status = notmuch_message_add_tag (message, flag2tag[i].tag);
@@ -1316,8 +1598,6 @@ notmuch_message_maildir_flags_to_tags (notmuch_message_t *message)
     }
     status = notmuch_message_thaw (message);
 
-    talloc_free (combined_flags);
-
     return status;
 }
 
@@ -1405,7 +1685,7 @@ _new_maildir_filename (void *ctx,
     char *filename_new, *dir;
     char flag_map[128];
     int flags_in_map = 0;
-    notmuch_bool_t flags_changed = FALSE;
+    bool flags_changed = false;
     unsigned int i;
     char *s;
 
@@ -1446,7 +1726,7 @@ _new_maildir_filename (void *ctx,
 	if (flag_map[flag] == 0) {
 	    flag_map[flag] = 1;
 	    flags_in_map++;
-	    flags_changed = TRUE;
+	    flags_changed = true;
 	}
     }
 
@@ -1455,7 +1735,7 @@ _new_maildir_filename (void *ctx,
 	if (flag_map[flag]) {
 	    flag_map[flag] = 0;
 	    flags_in_map--;
-	    flags_changed = TRUE;
+	    flags_changed = true;
 	}
     }
 
@@ -1626,3 +1906,170 @@ notmuch_message_destroy (notmuch_message_t *message)
 {
     talloc_free (message);
 }
+
+notmuch_database_t *
+_notmuch_message_database (notmuch_message_t *message)
+{
+    return message->notmuch;
+}
+
+static void
+_notmuch_message_ensure_property_map (notmuch_message_t *message)
+{
+    notmuch_string_node_t *node;
+
+    if (message->property_map)
+	return;
+
+    _notmuch_message_ensure_metadata (message, message->property_term_list);
+
+    message->property_map = _notmuch_string_map_create (message);
+
+    for (node = message->property_term_list->head; node; node = node->next) {
+	const char *key;
+	char *value;
+
+	value = strchr(node->string, '=');
+	if (!value)
+	    INTERNAL_ERROR ("malformed property term");
+
+	*value = '\0';
+	value++;
+	key = node->string;
+
+	_notmuch_string_map_append (message->property_map, key, value);
+
+    }
+
+    talloc_free (message->property_term_list);
+    message->property_term_list = NULL;
+}
+
+notmuch_string_map_t *
+_notmuch_message_property_map (notmuch_message_t *message)
+{
+    _notmuch_message_ensure_property_map (message);
+
+    return message->property_map;
+}
+
+bool
+_notmuch_message_frozen (notmuch_message_t *message)
+{
+    return message->frozen;
+}
+
+notmuch_status_t
+notmuch_message_reindex (notmuch_message_t *message,
+			 notmuch_indexopts_t *indexopts)
+{
+    notmuch_database_t *notmuch = NULL;
+    notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
+    notmuch_private_status_t private_status;
+    notmuch_filenames_t *orig_filenames = NULL;
+    const char *orig_thread_id = NULL;
+    notmuch_message_file_t *message_file = NULL;
+
+    int found = 0;
+
+    if (message == NULL)
+	return NOTMUCH_STATUS_NULL_POINTER;
+
+    /* Save in case we need to delete message */
+    orig_thread_id = notmuch_message_get_thread_id (message);
+    if (!orig_thread_id) {
+	/* XXX TODO: make up new error return? */
+	INTERNAL_ERROR ("message without thread-id");
+    }
+
+    /* strdup it because the metadata may be invalidated */
+    orig_thread_id = talloc_strdup (message, orig_thread_id);
+
+    notmuch = _notmuch_message_database (message);
+
+    ret = _notmuch_database_ensure_writable (notmuch);
+    if (ret)
+	return ret;
+
+    orig_filenames = notmuch_message_get_filenames (message);
+
+    private_status = _notmuch_message_remove_indexed_terms (message);
+    if (private_status) {
+	ret = COERCE_STATUS(private_status, "error removing terms");
+	goto DONE;
+    }
+
+    ret = notmuch_message_remove_all_properties_with_prefix (message, "index.");
+    if (ret)
+	goto DONE; /* XXX TODO: distinguish from other error returns above? */
+    if (indexopts && notmuch_indexopts_get_decrypt_policy (indexopts) == NOTMUCH_DECRYPT_FALSE) {
+	ret = notmuch_message_remove_all_properties (message, "session-key");
+	if (ret)
+	    goto DONE;
+    }
+
+    /* re-add the filenames with the associated indexopts */
+    for (; notmuch_filenames_valid (orig_filenames);
+	 notmuch_filenames_move_to_next (orig_filenames)) {
+
+	const char *date;
+	const char *from, *to, *subject;
+	char *message_id = NULL;
+	const char *thread_id = NULL;
+
+	const char *filename = notmuch_filenames_get (orig_filenames);
+
+	message_file = _notmuch_message_file_open (notmuch, filename);
+	if (message_file == NULL)
+	    continue;
+
+	ret = _notmuch_message_file_get_headers (message_file,
+						 &from, &subject, &to, &date,
+						 &message_id);
+	if (ret)
+	    goto DONE;
+
+	/* XXX TODO: deal with changing message id? */
+
+	_notmuch_message_add_filename (message, filename);
+
+	ret = _notmuch_database_link_message_to_parents (notmuch, message,
+							 message_file,
+							 &thread_id);
+	if (ret)
+	    goto DONE;
+
+	if (thread_id == NULL)
+	    thread_id = orig_thread_id;
+
+	_notmuch_message_add_term (message, "thread", thread_id);
+	/* Take header values only from first filename */
+	if (found == 0)
+	    _notmuch_message_set_header_values (message, date, from, subject);
+
+	ret = _notmuch_message_index_file (message, indexopts, message_file);
+
+	if (ret == NOTMUCH_STATUS_FILE_ERROR)
+	    continue;
+	if (ret)
+	    goto DONE;
+
+	found++;
+	_notmuch_message_file_close (message_file);
+	message_file = NULL;
+    }
+    if (found == 0) {
+	/* put back thread id to help cleanup */
+	_notmuch_message_add_term (message, "thread", orig_thread_id);
+	ret = _notmuch_message_delete (message);
+    } else {
+	_notmuch_message_sync (message);
+    }
+
+ DONE:
+    if (message_file)
+	_notmuch_message_file_close (message_file);
+
+    /* XXX TODO destroy orig_filenames? */
+    return ret;
+}