lib: basic message-property API

Initially, support get, set and removal of single key/value pair, as
well as removing all properties.

1 files changed, 108 insertions, 0 deletions

diff --git a/lib/message-property.cc b/lib/message-property.cc
new file mode 100644
index 00000000..1f04a207
--- /dev/null
+++ b/lib/message-property.cc
@@ -0,0 +1,108 @@
+/* message-property.cc - Properties are like tags, but (key,value) pairs.
+ * keys are allowed to repeat.
+ *
+ * This file is part of notmuch.
+ *
+ * Copyright © 2016 David Bremner
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * 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/ .
+ *
+ * Author: David Bremner <david@tethera.net>
+ */
+
+#include "notmuch-private.h"
+#include "database-private.h"
+#include "message-private.h"
+
+notmuch_status_t
+notmuch_message_get_property (notmuch_message_t *message, const char *key, const char **value)
+{
+    if (! value)
+	return NOTMUCH_STATUS_NULL_POINTER;
+
+    *value = _notmuch_string_map_get (_notmuch_message_property_map (message), key);
+
+    return NOTMUCH_STATUS_SUCCESS;
+}
+
+static notmuch_status_t
+_notmuch_message_modify_property (notmuch_message_t *message, const char *key, const char *value,
+				  notmuch_bool_t delete_it)
+{
+    notmuch_private_status_t private_status;
+    notmuch_status_t status;
+    char *term = NULL;
+
+    status = _notmuch_database_ensure_writable (_notmuch_message_database (message));
+    if (status)
+	return status;
+
+    if (key == NULL || value == NULL)
+	return NOTMUCH_STATUS_NULL_POINTER;
+
+    if (index (key, '='))
+	return NOTMUCH_STATUS_ILLEGAL_ARGUMENT;
+
+    term = talloc_asprintf (message, "%s=%s", key, value);
+
+    if (delete_it)
+	private_status = _notmuch_message_remove_term (message, "property", term);
+    else
+	private_status = _notmuch_message_add_term (message, "property", term);
+
+    if (private_status)
+	return COERCE_STATUS (private_status,
+			      "Unhandled error modifying message property");
+    if (! _notmuch_message_frozen (message))
+	_notmuch_message_sync (message);
+
+    if (term)
+	talloc_free (term);
+
+    return NOTMUCH_STATUS_SUCCESS;
+}
+
+notmuch_status_t
+notmuch_message_add_property (notmuch_message_t *message, const char *key, const char *value)
+{
+    return _notmuch_message_modify_property (message, key, value, FALSE);
+}
+
+notmuch_status_t
+notmuch_message_remove_property (notmuch_message_t *message, const char *key, const char *value)
+{
+    return _notmuch_message_modify_property (message, key, value, TRUE);
+}
+
+notmuch_status_t
+notmuch_message_remove_all_properties (notmuch_message_t *message, const char *key)
+{
+    notmuch_status_t status;
+    const char * term_prefix;
+
+    status = _notmuch_database_ensure_writable (_notmuch_message_database (message));
+    if (status)
+	return status;
+
+    _notmuch_message_invalidate_metadata (message, "property");
+    if (key)
+	term_prefix = talloc_asprintf (message, "%s%s=", _find_prefix ("property"), key);
+    else
+	term_prefix = _find_prefix ("property");
+
+    /* XXX better error reporting ? */
+    _notmuch_message_remove_terms (message, term_prefix);
+
+    return NOTMUCH_STATUS_SUCCESS;
+}