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https://github.com/danth/stylix
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28 lines
826 B
Haskell
28 lines
826 B
Haskell
module Stylix.Output ( makeOutputTable ) where
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import Data.Colour ( RGB(RGB) )
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import qualified Data.Vector as V
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import Data.Word ( Word8 )
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import Text.JSON ( JSObject, toJSObject )
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import Text.Printf ( printf )
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-- | Convert any 'RGB' colour to store integers between 0 and 255.
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toWord8 :: (RealFrac a) => RGB a -> RGB Word8
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toWord8 (RGB r g b) = RGB (truncate r) (truncate g) (truncate b)
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{- |
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Convert a colour to a hexdecimal string.
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>>> toHex (RGB 255 255 255)
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"#ffffff"
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-}
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toHex :: RGB Word8 -> String
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toHex (RGB r g b) = printf "%02x%02x%02x" r g b
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-- | Convert a palette to the JSON format expected by Stylix's NixOS modules.
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makeOutputTable :: (RealFrac a) => V.Vector (RGB a) -> JSObject String
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makeOutputTable
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= toJSObject
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. V.toList
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. V.imap (\i c -> (printf "base%02X" i, c))
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. V.map (toHex . toWord8)
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