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|
(.module:
[lux #*
[control
["." monad (#+ Monad do)]
["ex" exception (#+ Exception exception:)]]
[data
["." maybe]
["." error (#+ Error)]
["." text
format]
[collection
["." array (#+ Array)]]]
[time
["." instant (#+ Instant)]
["." duration]]
[world
["." binary (#+ Binary)]]
["." io (#+ Process)]
[host (#+ import:)]
[compiler
["." host]]])
(type: #export File Text)
(type: #export Permission
#Read
#Write
#Execute)
(signature: #export (System !)
(: (Monad !)
&monad)
(: (All [e a] (-> (Exception e) e (! a)))
throw)
(: (All [a] (-> (! a) (! (Error a))))
try)
(: (All [a] (-> (Error a) (! a)))
lift)
(do-template [<name>]
[(: (-> Binary File (! Any))
<name>)]
[append]
[write])
(do-template [<name> <output>]
[(: (-> File (! <output>))
<name>)]
[read Binary]
[size Nat]
[files (List File)]
[last-modified Instant])
(do-template [<name>]
[(: (-> File (! Bit))
<name>)]
[file?]
[directory?]
)
(: (-> Permission File (! Bit))
can?)
(do-template [<name>]
[(: (-> File (! Any))
<name>)]
[make-directory]
[delete]
)
(: (-> File File (! Any))
move)
(: (-> Instant File (! Any))
modify)
(: Text
separator)
)
(def: #export (un-nest System<!> file)
(All [!] (-> (System !) File (Maybe [File Text])))
(case (text.last-index-of (:: System<!> separator) file)
#.None
#.None
(#.Some last-separator)
(let [[parent temp] (maybe.assume (text.split last-separator file))
[_ child] (maybe.assume (text.split (text.size (:: System<!> separator)) temp))]
(#.Some [parent child]))))
(def: #export (nest System<!> [parent child])
(All [!] (-> (System !) [File Text] File))
(format parent (:: System<!> separator) child))
(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 host.jvm))
(as-is (import: #long java/io/File
(new [String])
(~~ (do-template [<name>]
[(<name> [] #io #try boolean)]
[exists] [mkdirs] [delete]
[isFile] [isDirectory]
[canRead] [canWrite] [canExecute]))
(length [] #io #try long)
(listFiles [] #io #try #? (Array java/io/File))
(getAbsolutePath [] #io #try String)
(renameTo [java/io/File] #io #try boolean)
(lastModified [] #io #try long)
(setLastModified [long] #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 #1]
[write #0]
)
(def: (read file)
(do io.Monad<Process>
[#let [file' (java/io/File::new file)]
size (java/io/File::length file')
#let [data (binary.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 #1)
(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 #1)
(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<!> file)
(All [!] (-> (System !) File (! Bit)))
(do (:: System<!> &monad)
[??? (:: System<!> file? file)]
(if ???
(wrap ???)
(:: System<!> directory? file))))
|
