minor cleanupd

1 files changed, 14 insertions, 9 deletions

diff --git a/debug-me.hs b/debug-me.hs
index 2625ecc..53ee545 100644
--- a/debug-me.hs
+++ b/debug-me.hs
@@ -87,9 +87,14 @@ sendTtyInput ichan devstate = go
 	send b = do
 		atomically $ do
 			ds <- readTVar devstate
+			let ed = if lastActivity ds == lastSeen ds
+				then B.concat $ sentSince ds
+				else case reverse (sentSince ds) of
+					[] -> mempty
+					(lb:_) -> lb
 			let entered = Entered
 				{ enteredData = Val b
-				, echoData = Val $ B.concat $ sentSince ds
+				, echoData = Val ed
 				}
 			let act = Activity (Proto entered) (Just $ lastActivity ds) dummySignature
 			writeTChan ichan act
@@ -153,10 +158,10 @@ isLegalSeen act@(Activity p (Just hp) sig) ds
 			    	then (drop n ss, drop n es)
 				else (mempty, mempty)
 			in yes $ DeveloperState
-				{ lastSeen = h
+				{ lastSeen = acth
 				, sentSince = ss'
 				, enteredSince = es'
-				, lastActivity = h
+				, lastActivity = acth
 				}
 	-- Does it chain to something we've entered since the last Seen
 	-- value? Eg, user sent A, we replied B C, and the user has
@@ -173,19 +178,19 @@ isLegalSeen act@(Activity p (Just hp) sig) ds
 				    ss' = drop (i+1) ss
 				    es' = drop (i+1) es
 				in yes $ DeveloperState
-					{ lastSeen = h
+					{ lastSeen = acth
 					, sentSince = ss'
 					, enteredSince = es'
-					, lastActivity = h
+					, lastActivity = acth
 					}
   where
-	h = hash act
+	acth = hash act
 	yes ds' = (True, ds')
 	-- When they rejected a message we sent, anything we sent
 	-- subsequently will also be rejected, so forget about it.
 	yesrej = yes $ ds
-		{ lastSeen = h
-		, lastActivity = h
+		{ lastSeen = acth
+		, lastActivity = acth
 		}
 isLegalSeen (Activity _ Nothing _) ds = (False, ds)
 
@@ -288,7 +293,7 @@ truncateBacklog (Backlog (b :| l)) (Activity _ hp _)
 -- the current state of the system before manipulating it.
 --
 -- To support typeahead on slow links, some echoData may be provided
--- in the Entered activity. If the prevActivity points
+-- in the Entered activity. If the Entered activity points
 -- to an older Seen activity, then the echoData must match the
 -- concatenation of all Seen activities after that one, up to the
 -- most recent Seen activity.