CS代考 CSE230.Directory where

module CSE230.Directory where

import CSE230.Doc
import CSE230.List hiding (Dir)

import qualified Data.List as L
import System.FilePath (takeDirectory, takeFileName, ())
import System.Directory (doesFileExist, listDirectory)

——————————————————————————-
— | Top-level “main” function
——————————————————————————-
main :: [String] -> IO ()
main [“-ls”, p] = showDirectory (normalize p)
main [“-find”, p, sub] = showMatchingFiles (normalize p) sub
main args = putStrLn (errorMsg args)

normalize :: FilePath -> FilePath
normalize p = takeDirectory (p “.”)

errorMsg :: [String] -> String
errorMsg args = unlines
[ “Sorry, don’t understand: ” ++ unwords args ++ “. Try one of”
, ” * ‘htree -ls ‘ to render the directory of all files under ”
, ” * ‘htree -find sub’ to find all files matching ‘sub’ under ”

——————————————————————————-
— | ‘showDirectory path’ builds and displays the ‘Dir’ rooted at ‘path’
——————————————————————————-
— >>> showDirectory “src”
— ├── CSE230
— │ ├── Directory.hs
— │ ├── Doc.hs
— │ ├── Graphics.hs
— │ ├── List.hs
— │ └── Shapes.hs
— ├── Htdp
— │ ├── Combinator.hs
— │ ├── Data
— │ │ └── Image.hs
— │ ├── README.md
— │ └── Shape.hs
— ├── Htdp.hs
— └── Main.hs
—

showDirectory :: FilePath -> IO ()
showDirectory path = do
dir <- build path print (dirDoc dir) ------------------------------------------------------------------------------- -- | 'showMatchingFiles path sub' finds the files matching 'sub' (deep) in the -- the directory rooted at 'path' and prints them out. ------------------------------------------------------------------------------- -- >>> showMatchingFiles “src” “.hs”
— src/CSE230/Directory.hs
— src/CSE230/Doc.hs
— src/CSE230/Graphics.hs
— src/CSE230/List.hs
— src/CSE230/Shapes.hs
— src/Htdp/Combinator.hs
— src/Htdp/Data/Image.hs
— src/Htdp/Shape.hs
— src/Htdp.hs
— src/Main.hs

showMatchingFiles :: FilePath -> String -> IO ()
showMatchingFiles path sub = do
dir <- build path mapM_ putStrLn (findFiles sub dir) ------------------------------------------------------------------------------- -- | The 'Directory' data type ------------------------------------------------------------------------------- data Dir a = Fil a -- ^ A single file named `a` | Sub a [Dir a] -- ^ A sub-directory name `a` with contents `[Dir a]` deriving (Eq, Show) example :: Dir FilePath example = Sub "." [ Fil "COLLABORATORS.md" , Fil "LICENSE" , Fil "Makefile" , Fil "README.md" , Fil "cse230-tree.cabal" , Sub "out" [ Fil "carpet.png" , Fil "chess1.png" , Fil "chess2.png" , Fil "rainbow.png" , Fil "triangle1.png" , Fil "triangle2.png" , Sub "src" [ Sub "CSE230" [ Fil "Directory.hs" , Fil "Doc.hs" , Fil "Graphics.hs" , Fil "List.hs" , Fil "Shapes.hs" , Sub "Htdp" [ Fil "Combinator.hs" , Sub "Data" [ Fil "Image.hs" ] , Fil "README.md" , Fil "Shape.hs" , Fil "Htdp.hs" , Fil "Main.hs" , Fil "stack.yaml" srcDir :: Dir FilePath srcDir = Sub "src" [ Sub "CSE230" [ Fil "Directory.hs" , Fil "Doc.hs" , Fil "Graphics.hs" , Fil "List.hs" , Fil "Shapes.hs" , Sub "Htdp" [ Fil "Combinator.hs" , Sub "Data" [ Fil "Image.hs" ] , Fil "README.md" , Fil "Shape.hs" , Fil "Htdp.hs" , Fil "Main.hs" ------------------------------------------------------------------------------- -- | Printing Directories ------------------------------------------------------------------------------- -- >>> dirDoc example
— ├── COLLABORATORS.md
— ├── LICENSE
— ├── Makefile
— ├── README.md
— ├── cse230-tree.cabal
— ├── out
— │ ├── carpet.png
— │ ├── chess1.png
— │ ├── chess2.png
— │ ├── rainbow.png
— │ ├── triangle1.png
— │ └── triangle2.png
— ├── src
— │ ├── CSE230
— │ │ ├── Directory.hs
— │ │ ├── Doc.hs
— │ │ ├── Graphics.hs
— │ │ ├── List.hs
— │ │ └── Shapes.hs
— │ ├── Htdp
— │ │ ├── Combinator.hs
— │ │ ├── Data
— │ │ │ └── Image.hs
— │ │ ├── README.md
— │ │ └── Shape.hs
— │ ├── Htdp.hs
— │ └── Main.hs
— └── stack.yaml
—

dirDoc :: Dir FilePath -> Doc
dirDoc (Fil f) = error “fill this in”
dirDoc (Sub f ds) = error “fill this in”

——————————————————————————-
— | Some useful ‘Doc’s——————————————————–
——————————————————————————-
dash :: Doc
dash = doc “── ”

stile :: Doc
stile = doc “├”

angle :: Doc
angle = doc “└”

bar :: Doc
bar = doc “│”

——————————————————————————-
— | A ‘fold’ for directories
——————————————————————————-
data DirElem a = SubDir a | File a

foldDir :: ([a] -> r -> DirElem a -> r) -> r -> Dir a -> r
foldDir f = go []
go stk r (Fil a) = f stk r (File a)
go stk r (Sub a ds) = L.foldl’ (go stk’) r’ ds
r’ = f stk r (SubDir a)
stk’ = a:stk

——————————————————————————-
— | ‘allFiles dir’ returns a list of all the Files in ‘dir’
——————————————————————————-
— >>> allFiles example
— [“COLLABORATORS.md”,”LICENSE”,”Makefile”,”README.md”,”cse230-tree.cabal”,”carpet.png”,”chess1.png”,”chess2.png”,”rainbow.png”,”triangle1.png”,”triangle2.png”,”Directory.hs”,”Doc.hs”,”Graphics.hs”,”List.hs”,”Shapes.hs”,”Combinator.hs”,”Image.hs”,”README.md”,”Shape.hs”,”Htdp.hs”,”Main.hs””stack.yaml”]

allFiles :: Dir FilePath -> [FilePath]
allFiles dir = reverse (foldDir f [] dir)
f = error “fill this in”

——————————————————————————-
— | ‘allDirs dir’ returns a list of all the sub-directories in ‘dir’
——————————————————————————-
— >>> allDirs example
— [“.”,”out”,”src”,”CSE230″,”Htdp”,”Data”]

allDirs :: Dir FilePath -> [FilePath]
allDirs dir = reverse (foldDir f [] dir)
f = error “fill this in”

——————————————————————————-
— | ‘findFiles sub dir’ returns a list of all the Files-with-paths in ‘dir’
— such that ‘sub’ is a substring of the Files’ names.
——————————————————————————-
— >>> findFiles “.hs” example
— [“./src/CSE230/Directory.hs”,”./src/CSE230/Doc.hs”,”./src/CSE230/Graphics.hs”,”./src/CSE230/List.hs”,”./src/CSE230/Shapes.hs”,”./src/CSE230/Directory.hs”,”./src/Htdp/Combinator.hs”,”./src/htdp/Data/Image.hs”,”./src/Htdp/README.md”,”./src/htdp/Shape.hs”,”./src/Htdp.hs”,”./src/Main.hs”]

findFiles :: String -> Dir FilePath -> [FilePath]
findFiles sub dir = reverse (foldDir f [] dir)
f = error “fill this in”

——————————————————————————-
— | ‘build path’ constructing the Directory on the filesystem rooted at ‘path’
——————————————————————————-
— >>> build “src”
— Sub “src” [Sub “CSE230” [Fil “Directory.hs”, Fil “Doc.hs”, Fil “Graphics.hs”, Fil “List.hs”, Fil “Shapes.hs”], Sub “Htdp” [Fil “Combinator.hs”, Sub “Data” [Fil “Image.hs”], Fil “README.md”, Fil “Shape.hs”], Fil “Htdp.hs”, Fil “Main.hs”]

build :: FilePath -> IO (Dir FilePath)
build path = error “fill this in”

lshow :: Doc -> [String]
lshow = lines . show

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