1 files changed, 13 insertions, 4 deletions
diff --git a/src/Network.hs b/src/Network.hs
index 5872d13..a3c7120 100644
--- a/src/Network.hs
+++ b/src/Network.hs
@@ -2,6 +2,7 @@ module Network (
     Network(..),
     Node(..),
     NodeName(..), textNodeName, unpackNodeName,
+    nextNodeName,
 ) where
 
 import Control.Arrow
@@ -26,20 +27,28 @@ data Node = Node
     , nodeDir :: FilePath
     }
 
-newtype NodeName = NodeName Text
+data NodeName = NodeName Text Word
     deriving (Eq, Ord)
 
 textNodeName :: NodeName -> Text
-textNodeName (NodeName name) = name
+textNodeName (NodeName name 0) = name
+textNodeName (NodeName name num) = name <> T.pack "~" <> T.pack (show num)
 
 unpackNodeName :: NodeName -> String
-unpackNodeName (NodeName tname) = T.unpack tname
+unpackNodeName = T.unpack . textNodeName
+
+nextNodeName :: VarName -> [NodeName] -> NodeName
+nextNodeName (VarName tname) = go 0
+  where
+    go n [] = NodeName tname n
+    go n (NodeName tname' m : ns) | tname == tname' = go (max n m + 1) ns
+                                  | otherwise       = go n ns
 
 
 instance ExprType Node where
     textExprType _ = T.pack "node"
     textExprValue n = T.pack "n:" <> textNodeName (nodeName n)
-    emptyVarValue = Node (NodeName T.empty) T.empty undefined undefined
+    emptyVarValue = Node (NodeName T.empty 0) T.empty undefined undefined
 
     recordMembers = map (first T.pack)
         [ ("ip", RecordSelector $ nodeIp)