Update scaffolding with new load connection functions

Yesod.Settings provides load functions which were previously scaffolded.
They load the ConsStrs for SQL and ConnParams for Mongo.

This prevents the need for a lot of the imports in the scaffolding
settings and simplifies the existing Text import.

yesod/Scaffolding/Scaffolder.hs

@@ -94,10 +94,6 @@ scaffold = do
           MongoDB    -> $(codegen $ "mongoDBConnPool")
           Tiny       -> ""
 
-        settingsTextImport = case backend of
-          Postgresql -> "import Data.Text (Text, concat)\nimport Prelude hiding (concat)"
-          _          -> "import Data.Text (Text)"
-
         packages =
           if backend == MongoDB
             then "                 , persistent-mongoDB >= 0.6.1 && < 0.7\n                 , mongoDB >= 1.1\n                 , bson >= 0.1.5\n"

yesod/scaffold/Settings.hs.cg

@@ -32,10 +32,7 @@ import Yesod (liftIO, MonadControlIO, addWidget, addCassius, addJulius, addLuciu
 import Yesod.Settings
 import Data.Monoid (mempty)
 import System.Directory (doesFileExist)
-~settingsTextImport~
-import Data.Object
-import qualified Data.Object.Yaml as YAML
-import Control.Monad (join)
+import Data.Text (Text)
 
 
 -- Static setting below. Changing these requires a recompile

yesod/scaffold/mongoDBConnPool.cg

@@ -3,14 +3,6 @@ runConnectionPool = runMongoDBConn (ConfirmWrites [u"j" =: True])
 
 withConnectionPool :: (MonadControlIO m, Applicative m) => AppConfig -> (ConnectionPool -> m b) -> m b
 withConnectionPool conf f = do
-    (database,host) <- liftIO $ loadConnParams (appEnv conf)
+    (database,host) <- liftIO $ loadMongoConnParams (appEnv conf)
     withMongoDBPool (u database) host (connectionPoolSize conf) f
-  where
-    -- | The database connection parameters.
-    --  loadConnParams :: AppEnvironment -> IO (Database, HostName)
-    loadConnParams env = do
-        allSettings <- (join $ YAML.decodeFile ("config/mongoDB.yml" :: String)) >>= fromMapping
-        settings <- lookupMapping (show env) allSettings
-        database <- lookupScalar "database" settings
-        host <- lookupScalar "host" settings
-        return (database, host)
+

yesod/scaffold/postgresqlConnPool.cg

@@ -3,21 +3,8 @@ runConnectionPool = runSqlPool
 
 withConnectionPool :: MonadControlIO m => AppConfig -> (ConnectionPool -> m a) -> m a
 withConnectionPool conf f = do
-    cs <- liftIO $ loadConnStr (appEnv conf)
+    cs <- liftIO $ load~upper~ConnStr (appEnv conf)
     with~upper~Pool cs (connectionPoolSize conf) f
-  where
-    -- | The database connection string. The meaning of this string is backend-
-    -- specific.
-    loadConnStr :: AppEnvironment -> IO Text
-    loadConnStr env = do
-        allSettings <- (join $ YAML.decodeFile ("config/~backendLower~.yml" :: String)) >>= fromMapping
-        settings <- lookupMapping (show env) allSettings
-        database <- lookupScalar "database" settings :: IO Text
-
-        connPart <- fmap concat $ (flip mapM) ["user", "password", "host", "port"] $ \key -> do
-          value <- lookupScalar key settings
-          return $ [st| #{key}=#{value} |]
-        return $ [st|#{connPart} dbname=#{database}|]
 
 -- Example of making a dynamic configuration static
 -- use /return $(mkConnStr Production)/ instead of loadConnStr

yesod/scaffold/sqliteConnPool.cg

@@ -3,16 +3,8 @@ runConnectionPool = runSqlPool
 
 withConnectionPool :: MonadControlIO m => AppConfig -> (ConnectionPool -> m a) -> m a
 withConnectionPool conf f = do
-    cs <- liftIO $ loadConnStr (appEnv conf)
+    cs <- liftIO $ load~upper~ConnStr (appEnv conf)
     with~upper~Pool cs (connectionPoolSize conf) f
-  where
-    -- | The database connection string. The meaning of this string is backend-
-    -- specific.
-    loadConnStr :: AppEnvironment -> IO Text
-    loadConnStr env = do
-        allSettings <- (join $ YAML.decodeFile ("config/~backendLower~.yml" :: String)) >>= fromMapping
-        settings <- lookupMapping (show env) allSettings
-        lookupScalar "database" settings
 
 -- Example of making a dynamic configuration static
 -- use /return $(mkConnStr Production)/ instead of loadConnStr

yesod/scaffold/tiny/Settings.hs.cg

@@ -27,10 +27,7 @@ import Yesod.Widget (addWidget, addCassius, addJulius, addLucius, whamletFile)
 import Yesod.Settings
 import Data.Monoid (mempty)
 import System.Directory (doesFileExist)
-~settingsTextImport~
-import Data.Object
-import qualified Data.Object.Yaml as YAML
-import Control.Monad (join)
+import Data.Text (Text)
 
 -- | The location of static files on your system. This is a file system
 -- path. The default value works properly with your scaffolded site.