notmuch: add notmuch bindings

aerc is using an unmaintained fork of a not-well-functioning notmuch
binding library. Add custom bindings directly into the aerc repo to make
them more maintainable and more customizable to our needs.

Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 58 insertions, 0 deletions

diff --git a/lib/notmuch/messages.go b/lib/notmuch/messages.go
new file mode 100644
index 00000000..22cc0094
--- /dev/null
+++ b/lib/notmuch/messages.go
@@ -0,0 +1,58 @@
+//go:build notmuch
+// +build notmuch
+
+package notmuch
+
+/*
+#cgo LDFLAGS: -lnotmuch
+
+#include <notmuch.h>
+
+*/
+import "C"
+
+type Messages struct {
+	message  *C.notmuch_message_t
+	messages *C.notmuch_messages_t
+}
+
+// Next advances the Messages iterator to the next message. Next returns false if
+// no more messages are available
+func (m *Messages) Next() bool {
+	if C.notmuch_messages_valid(m.messages) == 0 {
+		return false
+	}
+	m.message = C.notmuch_messages_get(m.messages)
+	C.notmuch_messages_move_to_next(m.messages)
+	return true
+}
+
+// Message returns the current message in the iterator
+func (m *Messages) Message() Message {
+	return Message{
+		message: m.message,
+	}
+}
+
+// Close frees memory associated with a Messages iterator. This method is not
+// strictly necessary to call, as the resources will be freed when the Query
+// associated with the Messages object is freed.
+func (m *Messages) Close() {
+	C.notmuch_messages_destroy(m.messages)
+}
+
+// Tags returns a slice of all tags in the message list. WARNING: After calling
+// tags, the message list can no longer be iterated; a new list must be created
+// to iterate after calling Tags
+func (m *Messages) Tags() []string {
+	cTags := C.notmuch_messages_collect_tags(m.messages)
+	defer C.notmuch_tags_destroy(cTags)
+
+	tags := []string{}
+	for C.notmuch_tags_valid(cTags) > 0 {
+		tag := C.notmuch_tags_get(cTags)
+		tags = append(tags, C.GoString(tag))
+		C.notmuch_tags_move_to_next(cTags)
+	}
+	return tags
+}