Convert notmuch_thread_ids_t to notmuch_terms_t

[notmuch] / message.cc

diff --git a/message.cc b/message.cc
index f2405ac69a627a64be652c17b5cbced4b5774f23..1d9dfedaaa223b63823a5c731d029c6e0a28b5f4 100644 (file)
--- a/message.cc
+++ b/message.cc
@@ -31,14 +31,18 @@ struct _notmuch_message {
     Xapian::Document doc;
 };
 
-struct _notmuch_tags {
+typedef struct _notmuch_terms {
+    char prefix_char;
     Xapian::TermIterator iterator;
     Xapian::TermIterator iterator_end;
+} notmuch_terms_t;
+
+struct _notmuch_tags {
+    notmuch_terms_t terms;
 };
 
 struct _notmuch_thread_ids {
-    char *current;
-    char *next;
+    notmuch_terms_t terms;
 };
 
 /* "128 bits of thread-id ought to be enough for anybody" */
@@ -212,52 +216,64 @@ notmuch_message_get_filename (notmuch_message_t *message)
  * talloc_set_destructor at all otherwise).
  */
 static int
-_notmuch_tags_destructor (notmuch_tags_t *tags)
+_notmuch_terms_destructor (notmuch_terms_t *terms)
 {
-    tags->iterator.~TermIterator ();
-    tags->iterator_end.~TermIterator ();
+    terms->iterator.~TermIterator ();
+    terms->iterator_end.~TermIterator ();
 
     return 0;
 }
 
-notmuch_tags_t *
-notmuch_message_get_tags (notmuch_message_t *message)
+notmuch_terms_t *
+_notmuch_terms_create (void *ctx,
+                      Xapian::Document doc,
+                      const char *prefix_name)
 {
-    notmuch_tags_t *tags;
+    notmuch_terms_t *terms;
+    const char *prefix = _find_prefix (prefix_name);
 
-    tags = talloc (message, notmuch_tags_t);
-    if (unlikely (tags == NULL))
+    /* Currently, notmuch_terms_t is written with the assumption that
+     * any prefix its derivatives use will be only a single
+     * character. */
+    assert (strlen (prefix) == 1);
+
+    terms = talloc (ctx, notmuch_terms_t);
+    if (unlikely (terms == NULL))
        return NULL;
 
-    new (&tags->iterator) Xapian::TermIterator;
-    new (&tags->iterator_end) Xapian::TermIterator;
+    terms->prefix_char = *prefix;
+    new (&terms->iterator) Xapian::TermIterator;
+    new (&terms->iterator_end) Xapian::TermIterator;
+
+    talloc_set_destructor (terms, _notmuch_terms_destructor);
 
-    talloc_set_destructor (tags, _notmuch_tags_destructor);
+    terms->iterator = doc.termlist_begin ();
+    terms->iterator.skip_to (prefix);
+    terms->iterator_end = doc.termlist_end ();
 
-    tags->iterator = message->doc.termlist_begin ();
-    tags->iterator.skip_to (_find_prefix ("tag"));
-    tags->iterator_end = message->doc.termlist_end ();
+    return terms;
+}
 
-    return tags;
+/* The assertion is to ensure that 'type' is a derivative of
+ * notmuch_terms_t in that it contains a notmuch_terms_t as its first
+ * member. We do this by name of 'terms' as opposed to type, because
+ * that's as clever as I've been so far. */
+#define _notmuch_terms_create_type(ctx, doc, prefix_name, type) \
+    (COMPILE_TIME_ASSERT(offsetof(type, terms) == 0),          \
+     (type *) _notmuch_terms_create (ctx, doc, prefix_name))
+
+notmuch_tags_t *
+notmuch_message_get_tags (notmuch_message_t *message)
+{
+    return _notmuch_terms_create_type (message, message->doc, "tag",
+                                      notmuch_tags_t);
 }
 
 notmuch_thread_ids_t *
 notmuch_message_get_thread_ids (notmuch_message_t *message)
 {
-    notmuch_thread_ids_t *thread_ids;
-    std::string id_str;
-
-    thread_ids = talloc (message, notmuch_thread_ids_t);
-    if (unlikely (thread_ids == NULL))
-       return NULL;
-
-    id_str = message->doc.get_value (NOTMUCH_VALUE_THREAD);
-    thread_ids->next = talloc_strdup (message, id_str.c_str ());
-
-    /* Initialize thread_ids->current and terminate first ID. */
-    notmuch_thread_ids_advance (thread_ids);
-
-    return thread_ids;
+    return _notmuch_terms_create_type (message, message->doc, "thread",
+                                      notmuch_thread_ids_t);
 }
 
 void
@@ -461,61 +477,82 @@ notmuch_message_destroy (notmuch_message_t *message)
 }
 
 notmuch_bool_t
-notmuch_tags_has_more (notmuch_tags_t *tags)
+_notmuch_terms_has_more (notmuch_terms_t *terms)
 {
     std::string s;
 
-    if (tags->iterator == tags->iterator_end)
+    if (terms->iterator == terms->iterator_end)
        return FALSE;
 
-    s = *tags->iterator;
-    if (! s.empty () && s[0] == 'L')
+    s = *terms->iterator;
+    if (! s.empty () && s[0] == terms->prefix_char)
        return TRUE;
     else
        return FALSE;
 }
 
+const char *
+_notmuch_terms_get (notmuch_terms_t *terms)
+{
+    return talloc_strdup (terms, (*terms->iterator).c_str () + 1);
+}
+
+void
+_notmuch_terms_advance (notmuch_terms_t *terms)
+{
+    terms->iterator++;
+}
+
+void
+_notmuch_terms_destroy (notmuch_terms_t *terms)
+{
+    talloc_free (terms);
+}
+
+notmuch_bool_t
+notmuch_tags_has_more (notmuch_tags_t *tags)
+{
+    return _notmuch_terms_has_more (&tags->terms);
+}
+
 const char *
 notmuch_tags_get (notmuch_tags_t *tags)
 {
-    return talloc_strdup (tags, (*tags->iterator).c_str () + 1);
+    return _notmuch_terms_get (&tags->terms);
 }
 
 void
 notmuch_tags_advance (notmuch_tags_t *tags)
 {
-    tags->iterator++;
+    return _notmuch_terms_advance (&tags->terms);
 }
 
 void
 notmuch_tags_destroy (notmuch_tags_t *tags)
 {
-    talloc_free (tags);
+    return _notmuch_terms_destroy (&tags->terms);
 }
 
 notmuch_bool_t
 notmuch_thread_ids_has_more (notmuch_thread_ids_t *thread_ids)
 {
-    if (thread_ids->current == NULL || *thread_ids->current == '\0')
-       return FALSE;
-    else
-       return TRUE;
+    return _notmuch_terms_has_more (&thread_ids->terms);
 }
 
 const char *
 notmuch_thread_ids_get (notmuch_thread_ids_t *thread_ids)
 {
-    return thread_ids->current;
+    return _notmuch_terms_get (&thread_ids->terms);
 }
 
 void
 notmuch_thread_ids_advance (notmuch_thread_ids_t *thread_ids)
 {
-    thread_ids->current = strsep (&thread_ids->next, ",");
+    return _notmuch_terms_advance (&thread_ids->terms);
 }
 
 void
 notmuch_thread_ids_destroy (notmuch_thread_ids_t *thread_ids)
 {
-    talloc_free (thread_ids);
+    return _notmuch_terms_destroy (&thread_ids->terms);
 }