177 lines
5.0 KiB
Haskell
177 lines
5.0 KiB
Haskell
{-# LANGUAGE BlockArguments #-}
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module Main where
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import System.Posix.Directory ( getWorkingDirectory, changeWorkingDirectory )
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import System.Directory ( pathIsSymbolicLink
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, doesFileExist
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, getFileSize
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, doesDirectoryExist )
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import Data.Functor ( (<&>) )
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import Control.Monad ( filterM )
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import Control.Monad.IO.Class
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import System.Directory.Extra ( listContents )
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import System.IO.Error
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import Brick
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import Brick.Widgets.Edit
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import Graphics.Vty
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import Data.List.Extra
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import qualified Data.Ord
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import Data.Maybe
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listNonSymFiles :: FilePath -> IO [FilePath]
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listNonSymFiles dir = filterM ((not <$>) . pathIsSymbolicLink) =<< filterM doesFileExist =<< listContents dir
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listNonSymDirectories :: FilePath -> IO [FilePath]
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listNonSymDirectories dir = filterM ((not <$>) . pathIsSymbolicLink) =<< filterM doesDirectoryExist =<< listContents dir
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listSym :: FilePath -> IO [FilePath]
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listSym dir = filterM pathIsSymbolicLink =<< listContents dir
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handlePermissionError :: IOError -> IO Integer
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handlePermissionError e = if isPermissionError e then pure 0 else ioError e
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getSizeSubpaths :: FilePath -> IO [(FilePath, Integer)]
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getSizeSubpaths x = do
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sub <- listNonSymDirectories x
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subby <- mapM
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(\y -> (y,) . sum . map snd <$>
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getSizeSubpaths y)
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sub
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syms <- listSym x
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local <- listNonSymFiles x >>=
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(\y -> mapM
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(flip catchIOError handlePermissionError . getFileSize) y <&>
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zip y)
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pure $ sortOn (Data.Ord.Down . snd) $ local ++ subby ++ zip syms [0..0]
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data ScrollDirection where
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SUp :: ScrollDirection
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SDown :: ScrollDirection
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data AppS = AppS
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{
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_appCWD :: FilePath
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, _appCursor :: Int
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, _appFocus :: Maybe FilePath
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, _appSubFiles :: [(FilePath, Integer)]
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}
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app :: App AppS e ()
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app =
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App { appDraw = pure . browse
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, appHandleEvent = eventHandler
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, appStartEvent = pure ()
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, appAttrMap = attributeMap
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, appChooseCursor = showFirstCursor
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}
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attributeMap :: AppS -> AttrMap
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attributeMap = const $ attrMap defAttr
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[ (attrName "selected", withStyle defAttr reverseVideo)
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, (editAttr, fg brightBlack)
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]
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select :: Widget () -> Widget ()
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select = withAttr (attrName "selected")
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browse :: AppS -> Widget ()
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browse s =
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str "Path" <+> padLeft Max (str "Size") <=>
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viewport () Vertical (foldr (widgetCons s) emptyWidget (_appSubFiles s))
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widgetCons :: AppS -> (FilePath, Integer) -> Widget () -> Widget ()
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widgetCons s w@(f,_) ws =
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(<=> ws) if Just f == _appFocus s then
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select . visible $ pathWidget w else
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pathWidget w
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pathWidget :: (FilePath, Integer) -> Widget ()
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pathWidget (f, s) = str (show f) <+> padLeft Max (str (show s))
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sizeDir :: AppS -> IO AppS
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sizeDir s = do
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subFiles <- getSizeSubpaths $ _appCWD s
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pure $
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s {
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_appCursor = 0
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, _appFocus = map fst subFiles !? 0
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, _appSubFiles = subFiles
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}
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changeDir :: AppS -> IO AppS
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changeDir so
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allowed <- doesDirectoryExist path
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if allowed then do
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changeWorkingDirectory path
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let s =
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so {
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_appCWD = path
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, _appSubFiles = []
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} in
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sizeDir s else
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pure so
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| otherwise = pure so
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where path = fromJust $ _appFocus so
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overDir :: IO AppS
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overDir = do
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changeWorkingDirectory ".."
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a <- getWorkingDirectory
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changeDir $ initialState a
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scroll :: ScrollDirection -> AppS -> AppS
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scroll d s = s {
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_appCursor = newCursor
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, _appFocus = maybeNewPath
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}
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where cursor =
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_appCursor s +
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case d of
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SUp -> (-1)
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SDown -> 1
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newCursor = max 0 (min (subtract 1 . length $ _appSubFiles s) cursor)
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maybeNewPath = fst <$> _appSubFiles s !? newCursor
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eventHandler :: BrickEvent () e -> EventM () AppS ()
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eventHandler (VtyEvent (EvKey k _)) = do
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s <- get
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case k of
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(KChar 'q') -> halt
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KEsc -> halt
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(KChar 'j') -> put $ scroll SDown s
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(KChar 'k') -> put $ scroll SUp s
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KDown -> put $ scroll SDown s
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KUp -> put $ scroll SUp s
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(KChar 'h') -> put =<< liftIO overDir
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KLeft -> put =<< liftIO overDir
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(KChar ' ') -> put =<< liftIO (changeDir s)
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KEnter -> put =<< liftIO (changeDir s)
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(KChar 'l') -> put =<< liftIO (changeDir s)
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KRight -> put =<< liftIO (changeDir s)
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_ -> continueWithoutRedraw
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eventHandler _ = undefined
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initialState :: FilePath -> AppS
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initialState f =
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AppS {
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_appCWD = f
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, _appCursor = 0
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, _appFocus = pure f
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, _appSubFiles = []
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}
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main :: IO ()
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main = do
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a <- getWorkingDirectory
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b <- changeDir $ initialState a
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_ <- defaultMain app b
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return ()
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