Util.hs

module Ghcitui.Util (showT, splitBy, linesToText, clamp, getNumDigits, formatDigits) where

import Data.Text (Text, breakOn, drop, length, pack)
import Prelude hiding (drop, length)

-- | Split text based on a delimiter.
splitBy
    :: Text
    -- ^ Delimeter.
    -> Text
    -- ^ Text to split on.
    -> [Text]
splitBy "" source = [source]
splitBy delim source =
    case breakOn delim source of
        (l, "") -> [l]
        (l, r) -> l : splitBy delim (drop (length delim) r)

-- | Convert Strings to Text.
linesToText :: [String] -> Text
linesToText = pack . Prelude.unlines

-- | 'show' but to Text.
showT :: (Show a) => a -> Text
showT = pack . show

-- Return the number of digits in a given integral
getNumDigits :: (Integral a) => a -> Int
getNumDigits 0 = 1
getNumDigits num = truncate (logBase 10 (fromIntegral num) :: Double) + 1

-- | Format digits into a string with padding.
formatDigits
    :: Int
    -- ^ Number of spaces
    -> Int
    -- ^ Number to format digits of
    -> Text
    -- ^ Formatted Text
formatDigits spacing num = pack (replicate amount ' ') <> pack (show num)
  where
    amount = spacing - getNumDigits num

clamp
    :: (Ord a)
    => (a, a)
    -- ^ The minimum and maximum (inclusive)
    -> a
    -- ^ Value to clamp
    -> a
    -- ^ Result
clamp (mi, mx) v
    | v < mi = mi
    | v > mx = mx
    | otherwise = v