-- Copyright (C) 2008 JP Bernardy

module Yi.UI.Utils where
-- Utilities shared by various UIs

import Yi.Buffer
import Yi.Buffer.HighLevel
import Yi.Prelude
import Prelude ()
import Yi.Window

-- | return index of Sol on line @n@ above current line
indexOfSolAbove :: Int -> BufferM Point
indexOfSolAbove n = savingPointB $ do
    gotoLnFrom (negate n)
    pointB

-- | Transform (scroll) the window so that the point is visible.
showPoint :: FBuffer -> Window -> FBuffer
showPoint b w = result
  where (_, result) = runBuffer w b $ 
            do ln <- curLn
               let gap = min (ln-1) (height w `div` 2)
               i <- indexOfSolAbove gap
               f <- fromMark <$> askMarks
               setMarkPointB f i
               return ()