3 files changed, 13 insertions, 0 deletions
diff --git a/Notmuch/Class.hs b/Notmuch/Class.hs
new file mode 100644
index 0000000..2d2b416
--- /dev/null
+++ b/Notmuch/Class.hs
@@ -0,0 +1,4 @@
+module Notmuch.Class where
+
+class HasNotmuchId a where
+    notmuchId :: a -> String
diff --git a/Notmuch/Message.hs b/Notmuch/Message.hs
index 29ca5ec..dd1e809 100644
--- a/Notmuch/Message.hs
+++ b/Notmuch/Message.hs
@@ -9,6 +9,7 @@ import Data.Time.Calendar
 import Data.Time.Clock
 import Data.Time.Clock.POSIX
 import Data.Monoid
+import Notmuch.Class
 import qualified Data.Text as T
 import qualified Data.Map as M
 import qualified Data.CaseInsensitive as CI
@@ -88,6 +89,9 @@ instance Eq Message where
     a == b = messageId a == messageId b
 
 
+instance HasNotmuchId Message where
+    notmuchId = unMessageID . messageId
+
 
 instance FromJSON Message where
     parseJSON (Object v) = Message <$> (MessageID . ("id:"<>) <$> v .: "id")
diff --git a/Notmuch/SearchResult.hs b/Notmuch/SearchResult.hs
index 3a75e96..52b8c20 100644
--- a/Notmuch/SearchResult.hs
+++ b/Notmuch/SearchResult.hs
@@ -7,6 +7,7 @@ import Data.Aeson
 import Data.Text
 import Data.Time.Clock
 import Data.Time.Clock.POSIX
+import Notmuch.Class
 
 
 newtype ThreadID = ThreadID { unThreadID :: String }
@@ -33,6 +34,10 @@ instance Eq SearchResult where
         searchThread s1 == searchThread s2
 
 
+instance HasNotmuchId SearchResult where
+    notmuchId = unThreadID . searchThread
+
+
 instance FromJSON SearchResult where
     parseJSON (Object v) = SearchResult <$> ((ThreadID . ("thread:"++)) <$> v .: "thread")
                                         <*> (posixSecondsToUTCTime . fromInteger <$> v .: "timestamp")