From 15075c841cf906948eea8dfa23e192c3fd86a1fd Mon Sep 17 00:00:00 2001
From: James Houlahan <james.houlahan@proton.ch>
Date: Tue, 21 Feb 2023 14:36:49 +0100
Subject: [PATCH] feat: Expose methods to query ErrNoSuchMessage /
 ErrNoSuchMailbox

---
 errors.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 errors.go

diff --git a/errors.go b/errors.go
new file mode 100644
index 00000000..a332279b
--- /dev/null
+++ b/errors.go
@@ -0,0 +1,18 @@
+// Package gluon implements an IMAP4rev1 (+ extensions) mailserver.
+package gluon
+
+import (
+	"errors"
+
+	"github.com/ProtonMail/gluon/internal/state"
+)
+
+// IsNoSuchMessage returns true if the error is ErrNoSuchMessage.
+func IsNoSuchMessage(err error) bool {
+	return errors.Is(err, state.ErrNoSuchMessage)
+}
+
+// IsNoSuchMailbox returns true if the error is ErrNoSuchMailbox.
+func IsNoSuchMailbox(err error) bool {
+	return errors.Is(err, state.ErrNoSuchMailbox)
+}