database: Add new find_doc_ids_for_term interface.

The existing find_doc_ids function is convenient when the caller
doesn't want to be bothered constructing a term. But when the caller
*does* have the term already, that interface is just wasteful. So we
export a lower-level interface that maps a pre-constructed term to a
document-ID iterators.

diff --git a/lib/database.cc b/lib/database.cc
index 5d300732d4a635a369b569ddbe452f39bff73f59..cd3346fd54ee140bd9de4fb077538533a39d8d4d 100644 (file)
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -213,6 +213,17 @@ notmuch_status_to_string (notmuch_status_t status)
     }
 }
 
+static void
+find_doc_ids_for_term (notmuch_database_t *notmuch,
+                      const char *term,
+                      Xapian::PostingIterator *begin,
+                      Xapian::PostingIterator *end)
+{
+    *begin = notmuch->xapian_db->postlist_begin (term);
+
+    *end = notmuch->xapian_db->postlist_end (term);
+}
+
 static void
 find_doc_ids (notmuch_database_t *notmuch,
              const char *prefix_name,
@@ -220,15 +231,12 @@ find_doc_ids (notmuch_database_t *notmuch,
              Xapian::PostingIterator *begin,
              Xapian::PostingIterator *end)
 {
-    Xapian::PostingIterator i;
     char *term;
 
     term = talloc_asprintf (notmuch, "%s%s",
                            _find_prefix (prefix_name), value);
 
-    *begin = notmuch->xapian_db->postlist_begin (term);
-
-    *end = notmuch->xapian_db->postlist_end (term);
+    find_doc_ids_for_term (notmuch, term, begin, end);
 
     talloc_free (term);
 }