Add ToText type class

hw-prelude.cabal

@@ -96,5 +96,6 @@ library
                         HaskellWorks.IO.Network.Socket
                         HaskellWorks.IO.Process
                         HaskellWorks.Prelude
+                        HaskellWorks.ToText
                         HaskellWorks.Unsafe
   hs-source-dirs:       src

src/HaskellWorks/ToText.hs

@@ -0,0 +1,25 @@
+module HaskellWorks.ToText
+  ( ToText (..)
+  ) where
+
+import           Data.Function
+import           Data.String            (String)
+import           Data.Text              (Text)
+import qualified Data.Text              as T
+import qualified Data.Text.Lazy         as LT
+import qualified Data.Text.Lazy.Builder as TB
+
+class ToText a where
+  toText :: a -> Text
+
+instance ToText String where
+  toText = T.pack
+
+instance ToText Text where
+  toText = id
+
+instance ToText LT.Text where
+  toText = LT.toStrict
+
+instance ToText TB.Builder where
+  toText = LT.toStrict . TB.toLazyText