1 files changed, 33 insertions, 0 deletions
diff --git a/src/server/View/Format.hs b/src/server/View/Format.hs
new file mode 100644
index 0000000..354d46a
--- /dev/null
+++ b/src/server/View/Format.hs
@@ -0,0 +1,33 @@
+{-# LANGUAGE OverloadedStrings #-}
+
+module View.Format
+  ( price
+  ) where
+
+import Data.Text (Text)
+import qualified Data.Text as T
+import Data.List (intersperse)
+
+import Conf (Conf)
+import qualified Conf
+
+price :: Conf -> Int -> Text
+price conf amount = T.concat [number amount, " ", Conf.currency conf]
+
+number :: Int -> Text
+number n =
+  T.pack
+  . (++) (if n < 0 then "-" else "")
+  . reverse
+  . concat
+  . intersperse " "
+  . group 3
+  . reverse
+  . show
+  . abs $ n
+
+group :: Int -> [a] -> [[a]]
+group n xs =
+  if length xs <= n
+    then [xs]
+    else (take n xs) : (group n (drop n xs))