1 files changed, 39 insertions, 0 deletions

diff --git a/server/src/Thermoprint/Server/Printer/Debug.hs b/server/src/Thermoprint/Server/Printer/Debug.hs
new file mode 100644
index 0000000..b8c1430
--- /dev/null
+++ b/server/src/Thermoprint/Server/Printer/Debug.hs
@@ -0,0 +1,39 @@
+{-# LANGUAGE OverloadedStrings     #-}
+{-# LANGUAGE RankNTypes            #-}
+{-# LANGUAGE TemplateHaskell       #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE FlexibleInstances     #-}
+
+module Thermoprint.Server.Printer.Debug
+       ( Debug(..)
+       ) where
+
+import Control.Monad.IO.Class
+import Control.Monad.Trans.Resource
+import Control.Monad.Logger
+
+import Data.Text.Lazy (Text)
+import qualified Data.Text.Lazy as TL
+
+import qualified Data.Text as T
+
+import Thermoprint.Printout
+import Thermoprint.Server.Printer
+
+import Data.List (intersperse)
+import Data.Foldable (toList)
+import Data.Monoid
+
+data Debug = Debug
+
+instance Applicative m => IsPrinter Debug m where
+  printMethod _ = printMethod debugPrinter
+
+debugPrinter :: PrinterMethod
+debugPrinter = PM $ (>> return Nothing) . $(logDebugS) "Printer.Debug" . T.pack . show . cotext' 
+
+cotext' :: Printout -> Text
+cotext' = mconcat . intersperse "\n\n" . map (mconcat . map cotext'' . toList) . toList
+  where
+    cotext'' (Cooked b) = cotext b
+    cotext'' (Raw _)    = "[Raw]"