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(.module:
[lux #*
["." host (#+ import:)]
[abstract
["." monad (#+ do)]]
[control
["." try (#+ Try)]
["." io (#+ IO)]
[concurrency
["." promise]]]
[data
[collection
["." array]
["." list]
["." set]]]
[world
[file (#+ Path)]]]
["." // #_
["/#" // #_
["#" profile]
["#." action (#+ Action)]
["#." command (#+ Command)]]])
(import: java/nio/file/WatchKey
(reset [] #io boolean))
(import: java/util/concurrent/TimeUnit
(#enum SECONDS))
(import: java/nio/file/WatchService
(poll [long java/util/concurrent/TimeUnit] #io #try #? java/nio/file/WatchKey)
(poll #as fetch [] #io #try #? java/nio/file/WatchKey))
(import: java/nio/file/FileSystem
(newWatchService [] #io #try java/nio/file/WatchService))
(import: java/nio/file/FileSystems
(#static getDefault [] java/nio/file/FileSystem))
(import: java/lang/Object)
(import: java/lang/String)
(import: (java/nio/file/WatchEvent$Kind a))
(import: java/nio/file/StandardWatchEventKinds
(#static ENTRY_CREATE (java/nio/file/WatchEvent$Kind java/nio/file/Path))
(#static ENTRY_MODIFY (java/nio/file/WatchEvent$Kind java/nio/file/Path))
(#static ENTRY_DELETE (java/nio/file/WatchEvent$Kind java/nio/file/Path)))
(import: java/nio/file/Path
(register [java/nio/file/WatchService [(java/nio/file/WatchEvent$Kind ?)]] #io #try java/nio/file/WatchKey))
(import: java/io/File
(new [java/lang/String])
(exists [] #io #try boolean)
(isDirectory [] #io #try boolean)
(listFiles [] #io #try [java/io/File])
(getAbsolutePath [] #io #try java/lang/String)
(toPath [] java/nio/file/Path))
(def: (targets path)
(-> Path (Action (List Path)))
(promise.future
(loop [path path]
(let [file (java/io/File::new path)]
(do {@ (try.with io.monad)}
[exists? (java/io/File::exists file)
directory? (java/io/File::isDirectory file)]
(if (and exists?
directory?)
(do @
[children (java/io/File::listFiles file)
children (|> children
array.to-list
(monad.map @ (|>> java/io/File::getAbsolutePath)))
descendants (monad.map @ recur children)]
(wrap (#.Cons path (list.concat descendants))))
(wrap (list))))))))
(type: Watch-Event
(java/nio/file/WatchEvent$Kind java/lang/Object))
(def: watch-events
(List Watch-Event)
(list (:coerce Watch-Event (java/nio/file/StandardWatchEventKinds::ENTRY_CREATE))
(:coerce Watch-Event (java/nio/file/StandardWatchEventKinds::ENTRY_MODIFY))
(:coerce Watch-Event (java/nio/file/StandardWatchEventKinds::ENTRY_DELETE))))
(def: (watch! watcher path)
(-> java/nio/file/WatchService Path (Action Any))
(promise.future
(do (try.with io.monad)
[_ (java/nio/file/Path::register watcher
(array.from-list ..watch-events)
(|> path java/io/File::new java/io/File::toPath))]
(wrap []))))
(def: (poll! watcher)
(-> java/nio/file/WatchService (Action (Maybe java/nio/file/WatchKey)))
(promise.future
(java/nio/file/WatchService::poll 1 java/util/concurrent/TimeUnit::SECONDS watcher)))
(def: (drain! watcher)
(-> java/nio/file/WatchService (IO (Try Any)))
(do (try.with io.monad)
[?key (java/nio/file/WatchService::fetch watcher)]
(case ?key
(#.Some key)
(do io.monad
[valid? (java/nio/file/WatchKey::reset key)]
(if valid?
(drain! watcher)
(wrap (:: try.monad wrap []))))
#.None
(wrap []))))
(def: #export (do! command profile)
(All [a] (-> (Command a) (Command Any)))
(do {@ ///action.monad}
[#let [fs (java/nio/file/FileSystems::getDefault)]
watcher (promise.future (java/nio/file/FileSystem::newWatchService fs))
targets (|> profile
(get@ #///.sources)
set.to-list
(monad.map @ ..targets)
(:: @ map list.concat))
_ (monad.map @ (..watch! watcher) targets)
_ (command profile)]
(loop [_ []]
(do @
[?key (..poll! watcher)
_ (case ?key
(#.Some key)
(do @
[_ (promise.future (..drain! watcher))
_ (command profile)]
(wrap []))
#.None
(wrap []))]
(recur [])))))
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