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Safe indexing in 'highlightedItem'

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Just because there are some completions doesn't mean that the given
index may not still be too big.

Incidentally, this now allows every prompt to cycle through its items in
a nice way.
This commit is contained in:
slotThe 2021-01-31 22:04:46 +01:00
parent 4eec511eb8
commit f2cfaa3398
1 changed files with 7 additions and 3 deletions
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10
XMonad/Prompt.hs
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@ -107,7 +107,7 @@ import Data.Char (isSpace)
import Data.IORef
import Data.List
import qualified Data.Map as M
import Data.Maybe (fromMaybe)
import Data.Maybe (fromMaybe, listToMaybe)
import Data.Set (fromList, toList)
import System.IO
import System.IO.Unsafe (unsafePerformIO)
@ -397,10 +397,14 @@ highlightedItem st' completions = case complWinDim st' of
let
(_,_,_,_,xx,yy) = winDim
complMatrix = splitInSubListsAt (length yy) (take (length xx * length yy) completions)
(col_index,row_index) = (complIndex st')
(col_index,row_index) = complIndex st'
in case completions of
[] -> Nothing
_ -> Just $ complMatrix !! col_index !! row_index
_ -> complMatrix !? col_index >>= (!? row_index)
where
-- | Safe version of '(!!)'.
(!?) :: [a] -> Int -> Maybe a
(!?) xs n = listToMaybe $ drop n xs
-- | Return the selected completion, i.e. the 'String' we actually act
-- upon after the user confirmed their selection (by pressing @Enter@).