From 4c1239c2e846d8f1987257e1fc76232ec295804f Mon Sep 17 00:00:00 2001 From: tv Date: Sun, 28 Dec 2014 03:58:41 +0100 Subject: moveToParent with backspace (\DEL) --- test4.hs | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/test4.hs b/test4.hs index f493e6a..b9990a0 100644 --- a/test4.hs +++ b/test4.hs @@ -160,6 +160,7 @@ keymap "\ESC[b" = Just $ moveTreeUp 1 keymap "\ESC[5~" = Just $ \q -> moveTreeDown (screenHeight q `div` 2) q -- PgUp keymap "\ESC[6~" = Just $ \q -> moveTreeUp (screenHeight q `div` 2) q -- PgDn keymap "\n" = Just toggleFold +keymap "\DEL" = Just moveToParent -- backspace keymap ('\ESC':'[':'9':';':xs) = Just $ \q@State{..} -> do let (h,';':w) = break (==';') (take (length xs - 1) xs) -- ^ drop (assumed) trailing 't' @@ -213,6 +214,15 @@ moveTreeDown n q@State{..} = i -> moveCursorUp i q' +moveToParent q@State{..} = + case Z.parent cursor of + Nothing -> return q { flashMessage = "cannot go further up" } + Just cursor' -> + let q' = q { cursor = cursor' } + in case topOverrun q' of + 0 -> return q' + i -> moveTreeDown i q' + toggleFold :: State -> IO State toggleFold q@State{..} = case Z.label cursor of -- cgit v1.2.3