From 86e880f9787479e71a69d9a3c75064aa3d095a79 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sun, 14 Feb 2016 22:28:16 +0000
Subject: Minor code cleanup

---
 server/src/Thermoprint/Server/Printer/Generic.hs | 29 ++++++++++++++++--------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/server/src/Thermoprint/Server/Printer/Generic.hs b/server/src/Thermoprint/Server/Printer/Generic.hs
index 33172ef..f37be21 100644
--- a/server/src/Thermoprint/Server/Printer/Generic.hs
+++ b/server/src/Thermoprint/Server/Printer/Generic.hs
@@ -40,7 +40,7 @@ import Control.Monad.Catch
 
 import Data.Foldable
 
-import Data.List (intersperse, genericReplicate, intercalate)
+import Data.List (genericReplicate, intercalate)
 
 import Data.Int (Int64)
 
@@ -78,16 +78,25 @@ escSequence = mapM_ pushWord8 . (esc:)
 initialize :: Render
 initialize = replicateM_ 2 $ escSequence [64]
 
+newl :: Lazy.ByteString
+newl = "\r\n"
+
+newls :: Integer -> Lazy.ByteString
+newls i = mconcat $ genericReplicate i newl
+
 finalize :: Render -- TODO: adjust this to produce proper padding
-finalize = encode' "\n\n\n"
+finalize = encode' $ newls 2
+
+intersperse :: b -> (a -> b) -> Seq a -> Seq b
+intersperse _ _ (viewl -> EmptyL)                 = Seq.empty
+intersperse _ f (viewl -> x :< (viewl -> EmptyL)) = Seq.singleton $ f x
+intersperse b f (viewl -> x :< xs)                = f x <| b <| intersperse' b f xs
 
-intersperse' :: b -> (a -> b) -> Seq a -> Seq b
-intersperse' _ _ (viewl -> EmptyL)                 = Seq.empty
-intersperse' _ f (viewl -> x :< (viewl -> EmptyL)) = Seq.singleton $ f x
-intersperse' b f (viewl -> x :< xs)                = f x <| b <| intersperse' b f xs
+intersperse' :: Monad m => m b -> (a -> m b) -> Seq a -> m ()
+intersperse' b f = sequence_ . intersperse b f
 
 render :: Printout -> Render
-render = sequence_ . intersperse' (encode' "\n\n") renderPar
+render = intersperse' (encode' newl) renderPar
 
 renderPar :: Paragraph -> Render
 renderPar = mapM_ renderChunk
@@ -96,6 +105,6 @@ renderPar = mapM_ renderChunk
     renderChunk (Cooked block) = renderBlock block
 
 renderBlock :: Block -> Render
-renderBlock (VSpace n) = encode' $ genericReplicate n '\n'
-renderBlock (NewlSep xs) =  sequence_ intercalate (encode' "\n") . map renderBlock . toList $ xs
-renderBlock (Line x) = undefined
+renderBlock (VSpace n)   = encode' $ newls n
+renderBlock (NewlSep xs) = intersperse' (encode' newl) . fmap renderBlock $ xs
+renderBlock (Line x)     = undefined
-- 
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