391 lines
14 KiB
Haskell
391 lines
14 KiB
Haskell
{-|
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A simple text UI for hledger.
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-}
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module UICommand
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where
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import qualified Data.Map as Map
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import Data.Map ((!))
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import Graphics.Vty
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import qualified Data.ByteString.Char8 as B
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import Ledger
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import Options
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import BalanceCommand
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import RegisterCommand
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import PrintCommand
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helpmsg = "Welcome to hledger. (b)alances, (r)egister, (p)rint entries, (l)edger, (right) to drill down, (left) to back up, or (q)uit"
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instance Show Vty where show v = "a Vty"
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-- | The application state when running the ui command.
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data AppState = AppState {
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av :: Vty -- ^ the vty context
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,aw :: Int -- ^ window width
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,ah :: Int -- ^ window height
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,amsg :: String -- ^ status message
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,aopts :: [Opt] -- ^ command-line opts
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,aargs :: [String] -- ^ command-line args
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,aledger :: Ledger -- ^ parsed ledger
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,abuf :: [String] -- ^ lines of the current buffered view
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,alocs :: [Loc] -- ^ user's navigation trail within the UI
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-- ^ never null, head is current location
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} deriving (Show)
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-- | A location within the user interface.
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data Loc = Loc {
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scr :: Screen -- ^ one of the available screens
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,sy :: Int -- ^ viewport y scroll position
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,cy :: Int -- ^ cursor y position
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} deriving (Show)
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-- | The screens available within the user interface.
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data Screen = BalanceScreen -- ^ like hledger balance, shows accounts
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| RegisterScreen -- ^ like hledger register, shows transactions
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| PrintScreen -- ^ like hledger print, shows entries
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| LedgerScreen -- ^ shows the raw ledger
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deriving (Eq,Show)
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-- | Run the interactive text ui.
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ui :: [Opt] -> [String] -> Ledger -> IO ()
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ui opts args l = do
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v <- mkVty
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(w,h) <- getSize v
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let opts' = SubTotal:opts
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let a = enter BalanceScreen $
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AppState {
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av=v
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,aw=w
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,ah=h
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,amsg=helpmsg
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,aopts=opts'
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,aargs=args
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,aledger=l
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,abuf=[]
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,alocs=[]
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}
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go a
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-- | Update the screen, wait for the next event, repeat.
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go :: AppState -> IO ()
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go a@AppState{av=av,aw=aw,ah=ah,abuf=buf,amsg=amsg,aopts=opts,aargs=args,aledger=l} = do
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when (not $ DebugNoUI `elem` opts) $ update av (renderScreen a)
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k <- getEvent av
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case k of
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EvResize x y -> go $ resize x y a
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EvKey (KASCII 'l') [MCtrl] -> refresh av >> go a{amsg=helpmsg}
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EvKey (KASCII 'b') [] -> go $ resetTrailAndEnter BalanceScreen a
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EvKey (KASCII 'r') [] -> go $ resetTrailAndEnter RegisterScreen a
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EvKey (KASCII 'p') [] -> go $ resetTrailAndEnter PrintScreen a
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EvKey (KASCII 'l') [] -> go $ resetTrailAndEnter LedgerScreen a
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EvKey KRight [] -> go $ drilldown a
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EvKey KEnter [] -> go $ drilldown a
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EvKey KLeft [] -> go $ backout a
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EvKey KUp [] -> go $ moveUpAndPushEdge a
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EvKey KDown [] -> go $ moveDownAndPushEdge a
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EvKey KHome [] -> go $ moveToTop a
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EvKey KUp [MCtrl] -> go $ moveToTop a
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EvKey KUp [MShift] -> go $ moveToTop a
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EvKey KEnd [] -> go $ moveToBottom a
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EvKey KDown [MCtrl] -> go $ moveToBottom a
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EvKey KDown [MShift] -> go $ moveToBottom a
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EvKey KPageUp [] -> go $ prevpage a
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EvKey KBS [] -> go $ prevpage a
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EvKey (KASCII ' ') [MShift] -> go $ prevpage a
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EvKey KPageDown [] -> go $ nextpage a
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EvKey (KASCII ' ') [] -> go $ nextpage a
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EvKey (KASCII 'q') [] -> shutdown av >> return ()
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-- EvKey KEsc [] -> shutdown av >> return ()
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_ -> go a
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where
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bh = length buf
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y = posY a
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-- app state modifiers
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-- | The number of lines currently available for the main data display area.
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pageHeight :: AppState -> Int
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pageHeight a = ah a - 1
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setLocCursorY, setLocScrollY :: Int -> Loc -> Loc
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setLocCursorY y l = l{cy=y}
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setLocScrollY y l = l{sy=y}
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cursorY, scrollY, posY :: AppState -> Int
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cursorY = cy . loc
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scrollY = sy . loc
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posY a = scrollY a + cursorY a
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setCursorY, setScrollY, setPosY :: Int -> AppState -> AppState
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setCursorY y a@AppState{alocs=(l:locs)} = a{alocs=(l':locs)} where l' = setLocCursorY y l
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setScrollY y a@AppState{alocs=(l:locs)} = a{alocs=(l':locs)} where l' = setLocScrollY y l
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setPosY y a@AppState{alocs=(l:locs)} = a{alocs=(l':locs)}
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where
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l' = setLocScrollY sy $ setLocCursorY cy l
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ph = pageHeight a
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cy = y `mod` ph
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sy = y - cy
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updateCursorY, updateScrollY, updatePosY :: (Int -> Int) -> AppState -> AppState
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updateCursorY f a = setCursorY (f $ cursorY a) a
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updateScrollY f a = setScrollY (f $ scrollY a) a
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updatePosY f a = setPosY (f $ posY a) a
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resize :: Int -> Int -> AppState -> AppState
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resize x y a = setCursorY cy' a{aw=x,ah=y}
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where
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cy = cursorY a
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cy' = min cy (y-2)
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moveToTop :: AppState -> AppState
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moveToTop a = setPosY 0 a
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moveToBottom :: AppState -> AppState
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moveToBottom a = setPosY (length $ abuf a) a
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moveUpAndPushEdge :: AppState -> AppState
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moveUpAndPushEdge a@AppState{alocs=(Loc{sy=sy,cy=cy}:_)}
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| cy > 0 = updateCursorY (subtract 1) a
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| sy > 0 = updateScrollY (subtract 1) a
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| otherwise = a
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moveDownAndPushEdge :: AppState -> AppState
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moveDownAndPushEdge a@AppState{alocs=(Loc{sy=sy,cy=cy}:_)}
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| sy+cy >= bh = a
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| cy < ph-1 = updateCursorY (+1) a
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| otherwise = updateScrollY (+1) a
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where
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ph = pageHeight a
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bh = length $ abuf a
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-- | Scroll down by page height or until we can just see the last line,
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-- without moving the cursor, or if we are already scrolled as far as
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-- possible then move the cursor to the last line.
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nextpage :: AppState -> AppState
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nextpage (a@AppState{abuf=b})
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| sy < bh-jump = setScrollY sy' a
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| otherwise = setCursorY (bh-sy) a
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where
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sy = scrollY a
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jump = pageHeight a - 1
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bh = length b
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sy' = min (sy+jump) (bh-jump)
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-- | Scroll up by page height or until we can just see the first line,
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-- without moving the cursor, or if we are scrolled as far as possible
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-- then move the cursor to the first line.
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prevpage :: AppState -> AppState
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prevpage (a@AppState{abuf=b})
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| sy > 0 = setScrollY sy' a
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| otherwise = setCursorY 0 a
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where
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sy = scrollY a
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jump = pageHeight a - 1
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sy' = max (sy-jump) 0
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-- | Push a new UI location on to the stack.
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pushLoc :: Loc -> AppState -> AppState
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pushLoc l a = a{alocs=(l:alocs a)}
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popLoc :: AppState -> AppState
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popLoc a@AppState{alocs=locs}
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| length locs > 1 = a{alocs=drop 1 locs}
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| otherwise = a
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clearLocs :: AppState -> AppState
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clearLocs a = a{alocs=[]}
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exit :: AppState -> AppState
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exit = popLoc
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loc :: AppState -> Loc
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loc = head . alocs
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screen :: AppState -> Screen
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screen a = scr where (Loc scr _ _) = loc a
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-- | Enter a new screen, saving the old ui location on the stack.
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enter :: Screen -> AppState -> AppState
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enter scr@BalanceScreen a = updateData $ pushLoc Loc{scr=scr,sy=0,cy=0} a
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enter scr@RegisterScreen a = updateData $ pushLoc Loc{scr=scr,sy=0,cy=0} a
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enter scr@PrintScreen a = updateData $ pushLoc Loc{scr=scr,sy=0,cy=0} a
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enter scr@LedgerScreen a = updateData $ pushLoc Loc{scr=scr,sy=0,cy=0} a
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resetTrailAndEnter scr a = enter scr $ clearLocs a
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-- | Regenerate the display data appropriate for the current screen.
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updateData :: AppState -> AppState
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updateData a@AppState{aopts=opts,aargs=args,aledger=l}
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| scr == BalanceScreen = a{abuf=lines $ showBalanceReport opts [] l, aargs=[]}
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| scr == RegisterScreen = a{abuf=lines $ showRegisterReport opts args l}
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| scr == PrintScreen = a{abuf=lines $ showEntries opts args l}
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| scr == LedgerScreen = a{abuf=lines $ rawledgertext l}
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where scr = screen a
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backout :: AppState -> AppState
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backout a
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| screen a == BalanceScreen = a
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| otherwise = updateData $ popLoc a
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drilldown :: AppState -> AppState
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drilldown a
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| screen a == BalanceScreen = enter RegisterScreen a{aargs=[currentAccountName a]}
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| screen a == RegisterScreen = scrollToEntry e $ enter PrintScreen a
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| screen a == PrintScreen = enter LedgerScreen a
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| screen a == LedgerScreen = a
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where e = currentEntry a
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-- | Get the account name currently highlighted by the cursor on the
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-- balance screen. Results undefined while on other screens.
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currentAccountName :: AppState -> AccountName
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currentAccountName a = accountNameAt (abuf a) (posY a)
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-- | Get the full name of the account being displayed at a specific line
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-- within the balance command's output.
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accountNameAt :: [String] -> Int -> AccountName
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accountNameAt buf lineno = accountNameFromComponents anamecomponents
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where
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namestohere = map (drop 22) $ take (lineno+1) buf
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(indented, nonindented) = span (" " `isPrefixOf`) $ reverse namestohere
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thisbranch = indented ++ take 1 nonindented
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anamecomponents = reverse $ map strip $ dropsiblings thisbranch
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dropsiblings :: [AccountName] -> [AccountName]
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dropsiblings [] = []
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dropsiblings (x:xs) = [x] ++ dropsiblings xs'
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where
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xs' = dropWhile moreindented xs
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moreindented = (>= myindent) . indentof
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myindent = indentof x
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indentof = length . takeWhile (==' ')
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-- | If on the print screen, move the cursor to highlight the specified entry
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-- (or a reasonable guess). Doesn't work.
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scrollToEntry :: Entry -> AppState -> AppState
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scrollToEntry e a@AppState{abuf=buf} = setCursorY cy $ setScrollY sy a
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where
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entryfirstline = head $ lines $ showEntry $ e
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halfph = pageHeight a `div` 2
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y = fromMaybe 0 $ findIndex (== entryfirstline) buf
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sy = max 0 $ y - halfph
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cy = y - sy
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-- | Get the entry containing the transaction currently highlighted by the
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-- cursor on the register screen (or best guess). Results undefined while
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-- on other screens. Doesn't work.
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currentEntry :: AppState -> Entry
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currentEntry a@AppState{aledger=l,abuf=buf} = entryContainingTransaction a t
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where
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t = safehead nulltxn $ filter ismatch $ ledgerTransactions l
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ismatch t = date t == (parsedate $ take 10 datedesc)
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&& (take 70 $ showtxn False t nullmixedamt) == (datedesc ++ acctamt)
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datedesc = take 32 $ fromMaybe "" $ find (not . (" " `isPrefixOf`)) $ [safehead "" rest] ++ reverse above
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acctamt = drop 32 $ safehead "" rest
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safehead d ls = if null ls then d else head ls
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(above,rest) = splitAt y buf
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y = posY a
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-- | Get the entry which contains the given transaction.
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-- Will raise an error if there are problems.
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entryContainingTransaction :: AppState -> Transaction -> Entry
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entryContainingTransaction AppState{aledger=l} t = (entries $ rawledger l) !! entryno t
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-- renderers
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renderScreen :: AppState -> Picture
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renderScreen (a@AppState{aw=w,ah=h,abuf=buf,amsg=msg}) =
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pic {pCursor = Cursor cx cy,
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pImage = mainimg
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<->
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renderStatus w msg
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}
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where
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(cx, cy) = (0, cursorY a)
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sy = scrollY a
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-- trying for more speed
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mainimg = (vertcat $ map (render defaultattr) above)
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<->
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(render currentlineattr thisline)
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<->
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(vertcat $ map (render defaultattr) below)
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render attr = renderBS attr . B.pack
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(thisline,below) | null rest = (blankline,[])
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| otherwise = (head rest, tail rest)
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(above,rest) = splitAt cy linestorender
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linestorender = map padclipline $ take (h-1) $ drop sy $ buf ++ replicate h blankline
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padclipline l = take w $ l ++ blankline
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blankline = replicate w ' '
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-- mainimg = (renderString attr $ unlines $ above)
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-- <->
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-- (renderString reverseattr $ thisline)
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-- <->
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-- (renderString attr $ unlines $ below)
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-- (above,(thisline:below))
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-- | null ls = ([],[""])
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-- | otherwise = splitAt y ls
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-- ls = lines $ fitto w (h-1) $ unlines $ drop as $ buf
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padClipString :: Int -> Int -> String -> [String]
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padClipString h w s = rows
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where
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rows = map padclipline $ take h $ lines s ++ replicate h blankline
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padclipline l = take w $ l ++ blankline
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blankline = replicate w ' '
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renderString :: Attr -> String -> Image
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renderString attr s = vertcat $ map (renderBS attr . B.pack) rows
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where
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rows = lines $ fitto w h s
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w = maximum $ map length $ ls
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h = length ls
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ls = lines s
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renderStatus :: Int -> String -> Image
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renderStatus w s = renderBS statusattr (B.pack $ take w (s ++ repeat ' '))
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-- the all-important theming engine
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theme = 1
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(defaultattr,
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currentlineattr,
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statusattr
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) =
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case theme of
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1 -> ( -- restrained
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attr
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,setBold attr
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,setRV attr
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)
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2 -> ( -- colorful
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setRV attr
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,setFG white $ setBG red $ attr
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,setFG black $ setBG green $ attr
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)
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3 -> ( --
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setRV attr
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,setFG white $ setBG red $ attr
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,setRV attr
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)
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halfbrightattr = setHalfBright attr
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reverseattr = setRV attr
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redattr = setFG red attr
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greenattr = setFG green attr
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reverseredattr = setRV $ setFG red attr
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reversegreenattr= setRV $ setFG green attr
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-- pic { pCursor = Cursor x y,
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-- pImage = renderFill pieceA ' ' w y
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-- <->
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-- renderHFill pieceA ' ' x <|> renderChar pieceA '@' <|> renderHFill pieceA ' ' (w - x - 1)
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-- <->
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-- renderFill pieceA ' ' w (h - y - 1)
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-- <->
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-- renderStatus w msg
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-- }
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