Writing some basic scaffolding for colors

1 files changed, 27 insertions, 0 deletions

diff --git a/src/WWW/Colors/QQ.hs b/src/WWW/Colors/QQ.hs
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+++ b/src/WWW/Colors/QQ.hs
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+{-# LANGUAGE TemplateHaskell #-}
+module WWW.Colors.QQ
+    ( hex
+    ) where
+
+-- import Data.Colour
+-- import Data.Colour.SRGB
+import Control.Monad ((>=>))
+import Diagrams.Backend.CmdLine (readHexColor)
+import Language.Haskell.TH.Quote
+
+
+
+-- | QuasiQuoter which reads in a hex color code and ouputs a 'AlphaColour Double'.
+hex :: QuasiQuoter
+hex = QuasiQuoter
+    { quoteExp = readHexColor >=> \x -> x `seq` pure [|x|]
+    , quotePat = failure "quotePat"
+    , quoteType = failure "quoteType"
+    , quoteDec = failure "quoteDec"
+    } where
+        failure s = const $ fail $ "No " <> s <> " defined for the hexcolor quasiquoter."
+        -- readit = sRGB24reads :: ReadS (Colour Double)
+        -- parseit s =
+        --     case readit s of
+        --       [(x,[])] -> x `seq` [|x|]
+        --       _ -> fail $ "Can't understand " <> s <> " as a valid hex color"