Fixes #61

Added some more breadcrumbs and indication of where to go next for some of the
later levels.

src/Level05/AppM.hs

@@ -107,3 +107,5 @@ liftEither
   -> AppM a
 liftEither =
   error "throwLeft not implemented"
+
+-- Go to 'src/Level05/DB.hs' next.

src/Level05/DB.hs

@@ -99,3 +99,5 @@ deleteTopic
   -> AppM ()
 deleteTopic =
   error "Copy your completed 'deleteTopic' and refactor to match the new type signature"
+
+-- Go to 'src/Level05/Core.hs' next.

src/Level05/README.md

@@ -4,4 +4,7 @@ Handling those `Either` values everywhere is a bit awkward, this exercise
 introduces our first monad transformer, ``ExceptT``. Further along, we will add
 the concept of a 'transformer stack' and what benefits it can provide.
 
-Start in ``src/Level05/AppM.hs``.
+The steps for this level:
+1) ``src/Level05/AppM.hs``
+2) ``src/Level05/DB.hs``
+3) ``src/Level05/Core.hs``

src/Level06/Conf/File.hs

@@ -50,3 +50,5 @@ parseJSONConfigFile
   -> IO ( Either ConfigError PartialConf )
 parseJSONConfigFile =
   error "parseJSONConfigFile not implemented"
+
+-- Go to 'src/Level06/Conf.hs' next.

src/Level06/Types.hs

@@ -237,3 +237,6 @@ instance Monoid PartialConf where
 -- data structure.
 instance FromJSON PartialConf where
   parseJSON = error "parseJSON for PartialConf not implemented yet."
+
+-- Go to 'src/Level06/Conf/File.hs' next
+

src/Level07/AppM.hs

@@ -96,10 +96,10 @@ instance MonadIO AppM where
   liftIO :: IO a -> AppM a
   liftIO = error "liftIO for AppM not implemented"
 
--- Move on to ``src/Level07/DB.hs`` after this
-
 liftEither
   :: Either Error a
   -> AppM a
 liftEither =
   error "throwLeft not implemented"
+
+-- Move on to ``src/Level07/DB.hs`` after this

src/Level07/DB.hs

@@ -95,3 +95,5 @@ deleteTopic
   -> AppM ()
 deleteTopic =
   error "Copy your completed 'deleteTopic' and refactor to match the new type signature"
+
+-- Go on to 'src/Level07/Core.hs' next.

src/Level07/README.md

@@ -12,4 +12,7 @@ the information in manually in every instance.
 Since we already have an AppM type, we're extending with more functionality,
 this is what is known as 'stacking' monad transformers.
 
-Start in ``src/Level07/AppM.hs``.
+The steps for this level:
+1) ``src/Level07/AppM.hs``
+2) ``src/Level07/DB.hs``
+3) ``src/Level07/Core.hs``