[rfc patch v3 2/6] lib: add _notmuch_message_remove_indexed_terms

[David Bremner]

Testing will be provided via use in notmuch_message_reindex
---
 lib/message.cc        | 44 ++++++++++++++++++++++++++++++++++++++++++++
 lib/notmuch-private.h |  2 ++
 lib/notmuch.h         |  4 ++++
 3 files changed, 50 insertions(+)

diff --git a/lib/message.cc b/lib/message.cc
index f8215a49..a7bd38ac 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -599,6 +599,50 @@ _notmuch_message_remove_terms (notmuch_message_t *message, const char *prefix)
     }
 }
 
+
+/* 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 tag_prefix = _find_prefix ("tag");
+    const std::string property_prefix = _find_prefix ("property");
+
+    for (i = message->doc.termlist_begin ();
+	 i != message->doc.termlist_end (); i++) {
+
+	const std::string term = *i;
+
+	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". */
 static bool is_maildir (const char *p)
 {
diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
index 8587e86c..1198d932 100644
--- a/lib/notmuch-private.h
+++ b/lib/notmuch-private.h
@@ -509,6 +509,8 @@ _notmuch_message_add_reply (notmuch_message_t *message,
 notmuch_database_t *
 _notmuch_message_database (notmuch_message_t *message);
 
+void
+_notmuch_message_remove_unprefixed_terms (notmuch_message_t *message);
 /* sha1.c */
 
 char *
diff --git a/lib/notmuch.h b/lib/notmuch.h
index fc00f96d..33e9fd24 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -1685,6 +1685,10 @@ notmuch_message_thaw (notmuch_message_t *message);
 void
 notmuch_message_destroy (notmuch_message_t *message);
 
+/* for testing */
+
+void
+notmuch_test_clear_terms(notmuch_message_t *message);
 /**
  * @name Message Properties
  *
-- 
2.11.0