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|
(.module:
[lux #*
[control
[monad (#+ Monad do)]
["ex" exception (#+ Exception exception:)]
pipe]
[data
[error (#+ Error)]
text/format
[collection [array]]]
[time
[instant (#+ Instant)]
[duration]]
[world [blob (#+ Blob)]]
[io (#+ Process)]
[host (#+ import:)]
[language/host]])
(type: #export File Text)
(type: #export Permission
#Read
#Write
#Execute)
(signature: #export (System m)
(: (Monad m)
&monad)
(: (All [e a] (-> (Exception e) e (m a)))
throw)
(: (All [a] (-> (m a) (m (Error a))))
try)
(: (All [a] (-> (Error a) (m a)))
lift)
(do-template [<name>]
[(: (-> Blob File (m Any))
<name>)]
[append] [write])
(do-template [<name> <output>]
[(: (-> File (m <output>))
<name>)]
[read Blob]
[size Nat]
[files (List File)]
[last-modified Instant])
(do-template [<name>]
[(: (-> File (m Bit))
<name>)]
[file?]
[directory?]
)
(: (-> Permission File (m Bit))
can?)
(do-template [<name>]
[(: (-> File (m Any))
<name>)]
[make-directory]
[delete]
)
(: (-> File File (m Any))
move)
(: (-> Instant File (m Any))
modify)
(: Text
separator)
)
(do-template [<name>]
[(exception: #export (<name> {file File})
(ex.report ["File" file]))]
[cannot-read-all-data]
[not-a-directory]
[cannot-make-directory]
[cannot-delete]
)
(exception: #export (cannot-move {target File} {source File})
(ex.report ["Source" source]
["Target" target]))
(exception: #export (cannot-modify {instant Instant} {file File})
(ex.report ["Instant" (%instant instant)]
["File" file]))
(`` (for {(~~ (static language/host.jvm))
(as-is (import: #long java/io/File
(new [String])
(exists [] #io #try boolean)
(mkdirs [] #io #try boolean)
(delete [] #io #try boolean)
(length [] #io #try long)
(listFiles [] #io #try #? (Array java/io/File))
(getAbsolutePath [] #io #try String)
(renameTo [java/io/File] #io #try boolean)
(isFile [] #io #try boolean)
(isDirectory [] #io #try boolean)
(lastModified [] #io #try long)
(setLastModified [long] #io #try boolean)
(canRead [] #io #try boolean)
(canWrite [] #io #try boolean)
(canExecute [] #io #try boolean)
(#static separator String))
(import: java/lang/AutoCloseable
(close [] #io #try void))
(import: java/io/OutputStream
(write [(Array byte)] #io #try void)
(flush [] #io #try void))
(import: java/io/FileOutputStream
(new [java/io/File boolean] #io #try))
(import: java/io/InputStream
(read [(Array byte)] #io #try int))
(import: java/io/FileInputStream
(new [java/io/File] #io #try))
(structure: #export JVM@System (System Process)
(def: &monad io.Monad<Process>)
(def: throw io.throw)
(def: (try computation)
(do io.Monad<IO>
[outcome computation]
(:: io.Monad<Process> wrap outcome)))
(def: lift (:: io.Monad<IO> wrap))
(do-template [<name> <flag>]
[(def: (<name> data file)
(do io.Monad<Process>
[stream (FileOutputStream::new [(java/io/File::new file) <flag>])
_ (OutputStream::write [data] stream)
_ (OutputStream::flush [] stream)]
(AutoCloseable::close [] stream)))]
[append true]
[write false]
)
(def: (read file)
(do io.Monad<Process>
[#let [file' (java/io/File::new file)]
size (java/io/File::length [] file')
#let [data (blob.create (.nat size))]
stream (FileInputStream::new [file'])
bytes-read (InputStream::read [data] stream)
_ (AutoCloseable::close [] stream)]
(if (i/= size bytes-read)
(wrap data)
(io.io (ex.throw cannot-read-all-data file)))))
(def: size
(|>> [] java/io/File::new
(java/io/File::length [])
(:: io.Monad<Process> map .nat)))
(def: (files dir)
(do io.Monad<Process>
[?files (java/io/File::listFiles [] (java/io/File::new dir))]
(case ?files
(#.Some files)
(monad.map @ (java/io/File::getAbsolutePath [])
(array.to-list files))
#.None
(io.throw not-a-directory dir))))
(do-template [<name> <method>]
[(def: <name> (|>> [] java/io/File::new (<method> [])))]
[file? java/io/File::isFile]
[directory? java/io/File::isDirectory]
)
(def: (can? permission file)
(let [jvm-file (java/io/File::new file)]
(case permission
#Read (java/io/File::canRead [] jvm-file)
#Write (java/io/File::canWrite [] jvm-file)
#Execute (java/io/File::canExecute [] jvm-file))))
(def: last-modified
(|>> [] java/io/File::new
(java/io/File::lastModified [])
(:: io.Monad<Process> map (|>> duration.from-millis instant.absolute))))
(do-template [<name> <exception> <method>]
[(def: (<name> subject)
(do io.Monad<IO>
[outcome (<method> [] (java/io/File::new subject))]
(case outcome
(#error.Success true)
(wrap (#error.Success []))
_
(io.throw <exception> [subject]))))]
[make-directory cannot-make-directory java/io/File::mkdirs]
[delete cannot-delete java/io/File::delete]
)
(do-template [<name> <exception> <method> <parameter-pre>]
[(def: (<name> parameter subject)
(do io.Monad<IO>
[outcome (<method> [(|> parameter <parameter-pre>)]
(java/io/File::new subject))]
(case outcome
(#error.Success true)
(wrap (#error.Success []))
_
(io.throw <exception> [parameter subject]))))]
[move cannot-move java/io/File::renameTo java/io/File::new]
[modify cannot-modify java/io/File::setLastModified (<| duration.to-millis instant.relative)]
)
(def: separator java/io/File::separator)
))
}))
(def: #export (exists? System<m> file)
(All [m] (-> (System m) File (m Bit)))
(|> file
(do> (:: System<m> &monad)
[(:: System<m> file?)]
[(if> [(wrap true)]
[(:: System<m> directory? file)])])))
|
