85 lines
2.3 KiB
Text
85 lines
2.3 KiB
Text
def hello := "world"
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structure Config where
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useASCII : Bool := false
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currentPrefix : String := ""
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abbrev ConfigIO (α : Type) : Type := ReaderT Config IO α
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#check read
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#print ConfigIO
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#check (Monad ConfigIO)
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#check MonadLift
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#check MonadWithReader
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#check outParam
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def currentConfig : ConfigIO Config :=
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fun cfg => pure cfg
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def usage : String :=
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"Usage: doug [--ascii]
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Options:
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\t--ascii\tUse ASCII characters to display the directry structure"
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def configFromArgs : List String → Option Config
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| [] => some {}
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| ["--ascii"] => some {useASCII := true}
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| _ => none
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inductive Entry where
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| file : String → Entry
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| dir : String → Entry
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def toEntry (path : System.FilePath) : IO (Option Entry) := do
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match path.components.getLast? with
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| none => pure (some (.dir ""))
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| some "." | some ".." => pure none
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| some name =>
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pure (some (if (← path.isDir) then .dir name else .file name))
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def Config.preFile (cfg : Config) :=
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if cfg.useASCII then "|--" else "├──"
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def Config.preDir (cfg : Config) :=
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if cfg.useASCII then "| " else "│ "
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/--
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Modify `cfg` on entering a directory.
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-/
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def Config.inDirectory (cfg : Config) : Config :=
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{cfg with currentPrefix := cfg.preDir ++ " " ++ cfg.currentPrefix}
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def showFileName (file : String) : ConfigIO Unit := do
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IO.println s!"{(← read).currentPrefix}{(← read).preFile} {file}"
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def showDirName (dir : String) : ConfigIO Unit := do
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IO.println s!"{(← read).currentPrefix}{(← read).preDir} {dir}/"
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def doList [Applicative f] : List α → (α → f Unit) → f Unit
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| [], _ => pure ()
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| x :: xs, action =>
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action x *>
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doList xs action
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partial def dirTree (path : System.FilePath) : ConfigIO Unit := do
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match ← toEntry path with
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| none => pure ()
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| some (.file name) => showFileName name
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| some (.dir name) =>
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showDirName name
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let contents ← path.readDir
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withReader (·.inDirectory)
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(doList contents.toList fun d =>
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dirTree d.path)
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def main (args : List String) : IO UInt32 := do
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match configFromArgs args with
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| some config =>
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(dirTree (← IO.currentDir)).run config
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pure 0
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| none =>
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IO.eprintln s!"Didn't understand argument(s) {" ".intercalate args}\n"
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IO.eprintln usage
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pure 1
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