better-files

better-files is a dependency-free pragmatic thin Scala wrapper around Java NIO.

Consult the changelog if you are upgrading your library.

Questions?

Ask in our gitter channel or file an issue with the question tag

Motivation

Imagine you have to write the following method:

List all .csv files in a directory by increasing order of file size
Drop the first line of each file and concat the rest into a single output file
Split the above output file into n smaller files without breaking up the lines in the input files
gzip each of the smaller output files

Note: Your program should work when files are much bigger than memory in your JVM and must close all open resources correctly

The above task is not that easy to write in Java or shell or Python without a certain amount of Googling. Using better-files, the above problem can be solved in a fairly straightforward way:

import better.files._

def run(inputDir: File, outputDir: File, n: Int) = {
  val count = new AtomicInteger()
  val outputs = Vector.tabulate(n)(i => outputDir / s"part-$i.csv.gz")
  for {
    writers <- outputs.map(_.newGzipOutputStream().printWriter()).autoClosed
    inputFile <- inputDir.list(_.extension == Some(".csv")).toSeq.sorted(File.Order.bySize)
    line <- inputFile.lineIterator.drop(1)
  } writers(count.incrementAndGet() % n).println(line)
}

Tests

Talks

ScalaDays NYC 2016 (slides)

ScalaDays NYC 2016: Introduction to better-files

ScalaDays Berlin 2016 (video, slides)
Scalæ by the Bay 2016 (video, slides)

Tutorial

Installation
Instantiation
Simple I/O
Resource APIs
Streams
Encodings
Java serialization utils
Java compatibility
Globbing
File system operations
Checksums
Temporary files
UNIX DSL
File attributes
File comparison
Zip/GZip
Automatic Resource Management
Scanner
File Monitoring
Reactive File Watcher

Installation

sbt:

libraryDependencies += "com.github.pathikrit" %% "better-files" % version

mill:

import mill._, scalalib._

object moduleName extends ScalaModule {
  override def ivyDeps = Agg(
    ivy"com.github.pathikrit::better-files:${version}"
  )
}

Available Versions:

< 9E19 /table>

Instantiation

The following are all equivalent:

import better.files._
import File._
import java.io.{File => JFile}

val f = File("/User/johndoe/Documents")                      // using constructor
val f1: File = file"/User/johndoe/Documents"                 // using string interpolator
val f2: File = "/User/johndoe/Documents".toFile              // convert a string path to a file
val f3: File = new JFile("/User/johndoe/Documents").toScala  // convert a Java file to Scala
val f4: File = root/"User"/"johndoe"/"Documents"             // using root helper to start from root
val f5: File = `~` / "Documents"                             // also equivalent to `home / "Documents"`
val f6: File = "/User"/"johndoe"/"Documents"                 // using file separator DSL
val f7: File = "/User"/'johndoe/'Documents                   // same as above but using Symbols instead of Strings
val f8: File = home/"Documents"/"presentations"/`..`         // use `..` to navigate up to parent

Note: Rename the import if you think the usage of the class File may confuse your teammates:

import better.files.{File => ScalaFile, _}
import java.io.File

I personally prefer renaming the Java crap instead:

import better.files._
import java.io.{File => JFile}

File Read/Write

Dead simple I/O:

val file = root/"tmp"/"test.txt"
file.overwrite("hello")
file.appendLine().append("world")
assert(file.contentAsString() == "hello\nworld")

If you are someone who likes symbols, then the above code can also be written as:

import better.files.Dsl.SymbolicOperations

file < "hello"     // same as file.overwrite("hello")
file << "world"    // same as file.appendLines("world")
assert(file! == "hello\nworld")

Or even, right-associatively:

import better.files.Dsl.SymbolicOperations

"hello" `>:` file
"world" >>: file
val bytes: Array[Byte] = file.loadBytes

Fluent Interface:

 (root/"tmp"/"diary.txt")
  .createIfNotExists()
  .appendLine()
  .appendLines("My name is", "Inigo Montoya")
  .moveToDirectory(home/"Documents")
  .renameTo("princess_diary.txt")
  .changeExtensionTo(".md")
  .lines()

Resource APIs

Confused by the various ways to load resources in Java? Worry no more:

val resource        : InputStream   = Resource.getAsStream("foo.txt") //Same as this.getClass().getResource("foo.txt")
val resourceURL     : java.net.URL  = Resource.getUrl("foo.txt")
val rootResourceURL : java.net.URL  = Resource.getUrl()
val resourceAsStr   : String        = Resource.getAsString("foo.txt")

The above APIs can load from custom ClassLoaders too:

val resource        : InputStream   = Resource.at[MyClass].getAsStream("foo.txt")

Streams

Various ways to slurp a file without loading its contents into memory:

val bytes  : Iterator[Byte]            = file.bytes()
val chars  : Iterator[Char]            = file.chars()
val lines  : Iterator[String]          = file.lineIterator()     //file.lines loads all lines in memory

Note: The above APIs can be traversed at most once e.g. file.bytes is a Iterator[Byte] which only allows TraversableOnce. To traverse it multiple times without creating a new iterator instance, convert it into some other collection e.g. file.bytes.toStream

You can write an Iterator[Byte] or an Iterator[String] back to a file:

file.writeBytes(bytes)
file.printLines(lines)

tee multiple outputstreams:

val s3 = s1 tee s2
s3.printWriter.println(s"Hello world") // gets written to both s1 and s2

Encodings

You can supply your own charset too for anything that does a read/write (it assumes java.nio.charset.Charset.defaultCharset() if you don't provide one):

val content: String = file.contentAsString()  // default charset

// custom charset:
import java.nio.charset.Charset
file.contentAsString(charset = Charset.forName("US-ASCII"))

//or simply using implicit conversion from Strings
file.write("hello world", charset = "US-ASCII")

Note: By default, better-files correctly handles BOMs while decoding. If you wish to have the incorrect JDK behaviour, you would need to supply Java's UTF-8 charset e.g.:

file.contentAsString(charset = Charset.forName("UTF-8"))    // Default incorrect JDK behaviour for UTF-8 (see: JDK-4508058)

If you also wish to write BOMs while encoding, you would need to supply it as:

file.write("hello world", charset = UnicodeCharset("UTF-8", writeByteOrderMarkers = true))

Java serialization utils

Some common utils to serialize/deserialize using Java's serialization util

case class Person(name: String, age: Int)
val person = new Person("Chris", 24)

// Write
file.newOutputStream().asObjectOutputStream.serialize(obj).flush()

// Read
val person2 = file.newInputStream().asObjectInputStream.deserialize[Person]
assert(person == person2)

// Read using custom class loader:
file.newInputStream().asObjectInputStreamUsingClassLoader(classLoader = myClassLoader).deserialize[Person]

The above can be simply written as:

val person2: Person = file.writeSerialized(person).readDeserialized()
assert(person == person2)

Java interoperability

You can always access the Java I/O classes:

val file: File = tmp / "hello.txt"
val javaFile     : java.io.File                 = file.toJava
val uri          : java.net.URI                 = file.uri
val url          : java.net.URL                 = file.url
val reader       : java.io.BufferedReader       = file.newBufferedReader()
val outputstream : java.io.OutputStream         = file.newOutputStream()
val writer       : java.io.BufferedWriter       = file.newBufferedWriter()
val inputstream  : java.io.InputStream          = file.newInputStream()
val path         : java.nio.file.Path           = file.path
val fs           : java.nio.file.FileSystem     = file.fileSystem
val channel      : java.nio.channel.FileChannel = file.newFileChannel()
val ram          : java.io.RandomAccessFile     = file.newRandomAccess()
val fr           : java.io.FileReader           = file.newFileReader()
val fw           : java.io.FileWriter           = file.newFileWriter(append = true)
val printer      : java.io.PrintWriter          = file.newPrintWriter()

The library also adds some useful implicits to above classes e.g.:

file1.reader() > file2.writer ()      // pipes a reader to a writer
System.in > file2.out             // pipes an inputstream to an outputstream
src.pipeTo(sink)                  // if you don't like symbols

val bytes   : Iterator[Byte]        = inputstream.bytes()
val bis     : BufferedInputStream   = inputstream.buffered()
val bos     : BufferedOutputStream  = outputstream.buffered()
val reader  : InputStreamReader     = inputstream.reader()
val writer  : OutputStreamWriter    = outputstream.writer()
val printer : PrintWriter           = outputstream.printWriter()
val br      : BufferedReader        = reader.buffered()
val bw      : BufferedWriter        = writer.buffered()
val mm      : MappedByteBuffer      = fileChannel.toMappedByteBuffer()
val str     : String                = inputstream.asString()  //Read a string from an InputStream
val in      : InputStream           = str.inputStream()
val reader  : Reader                = str.reader()
val lines   : Seq[String]           = str.lines()

better-files also supports certain conversions that are not supported out of the box by the JDK

Globbing

No need to port this to Scala:

val dir = "src"/"test"
val matches: Iterator[File] = dir.glob("**/*.{java,scala}")
// above code is equivalent to:
dir.listRecursively().filter
F438
(f => f.extension == Some(".java") || f.extension == Some(".scala"))

You can even use more advanced regex syntax instead of glob syntax:

val matches = dir.globRegex("^\\w*$".r) //equivalent to dir.glob("^\\w*$")(syntax = File.PathMatcherSyntax.regex)

By default, glob syntax in better-files is different from the default JDK glob behaviour since it always includes path. To use the default behaviour:

dir.glob("**/*.txt", includePath = false) // JDK default
//OR
dir.glob("*.txt", includePath = true) // better-files default

You can also extend the File.PathMatcherSyntax to create your own matchers.

For custom cases:

dir.collectChildren(_.isSymbolicLink) // collect all symlinks in a directory

For simpler cases, you can always use dir.list or dir.walk(maxDepth: Int)

File system operations

Utilities to ls, cp, rm, mv, ln, md5, touch, cat etc:

file.touch()
file.delete()     // unlike the Java API, also works on directories as expected (deletes children recursively)
file.clear()      // If directory, deletes all children; if file clears contents
file.renameTo(newName: String)
file.moveTo(destination)
file.moveToDirectory(destination)
file.copyTo(destination)       // unlike the default API, also works on directories (copies recursively)
file.copyToDirectory(destination)
file.linkTo(destination)                     // ln destination file
file.symbolicLinkTo(destination)             // ln -s destination file
file.setOwner(user: String)      // chown user file
file.setGroup(group: String)     // chgrp group file
Seq(file1, file2) `>:` file3     // same as cat file1 file2 > file3 (must import import better.files.Dsl.SymbolicOperations)
Seq(file1, file2) >>: file3      // same as cat file1 file2 >> file3 (must import import better.files.Dsl.SymbolicOperations)
file.isReadLocked(); file.isWriteLocked(); file.isLocked()
File.numberOfOpenFileDescriptors()        // number of open file descriptors

Checksums

One liner checksum for files:

file.md5() // equivalent to file.checksum("md5")
file.sha1()
file.sha256()
file.sha512()

Note: The above also works for directories (it recursively computes for each file in the directory).

For input/output streams:

val md5: String = inputstream.md5.hexDigest()
val md5: String = outputstream.md5.hexDigest()

The above consumes and closes the inputstream. If you want to write it to a file AND also compute the sha512, you can do:

val md5: String = inputstream.sha512.hexDigest(drainTo = someFile)

Temporary files

Utils to create temporary files:

File.newTemporaryDirectory()
File.newTemporaryFile()

The above APIs allow optional specifications of prefix, suffix and parentDir. These files are not deleted automatically on exit by the JVM (you have to set deleteOnExit which adds to shutdownHook).

A cleaner alternative is to use self-deleting file contexts which deletes the file immediately when done:

for {
 tempFile <- File.temporaryFile()
} doSomething(tempFile) // tempFile is auto deleted at the end of this block - even if an exception happens

OR equivalently:

File.usingTemporaryFile() {tempFile =>
  //do something
}  // tempFile is auto deleted at the end of this block - even if an exception happens

You can make any files temporary (i.e. delete after use) by doing this:

val foo = File.home / "Downloads" / "foo.txt"

for {
 temp <- foo.toTemporary
} doSomething(temp) // foo is deleted at the end of this block - even if an exception happens

UNIX DSL

All the above can also be expressed using methods reminiscent of the command line:

import better.files._
import better.files.Dsl._   // must import Dsl._ to bring in these utils

pwd / cwd     // current dir
cp(file1, file2)
mv(file1, file2)
rm(file) /*or*/ del(file)
ls(file) /*or*/ dir(file)
ln(file1, file2)     // hard link
ln_s(file1, file2)   // soft link
cat(file1)
cat(file1) >>: file
touch(file)
mkdir(file)
mkdirs(file)         // mkdir -p
chown(owner, file)
chgrp(owner, file)
chmod_+(permission, files)  // add permission
chmod_-(permission, files)  // remove permission
md5(file); sha1(file); sha256(file); sha512(file)
unzip(zipFile)(targetDir)
zip(file*)(targetZipFile)
ungzip(gzipFile)(targetFile)
gzip(file)(targetGZipFile)

File attributes

Query various file attributes e.g.:

file.name       // simpler than java.io.File#getName
file.extension()
file.contentType()
file.lastModifiedTime ()    // returns JSR-310 time
file.owner()
file.group()
file.isDirectory(); file.isSymbolicLink(); file.isRegularFile()
file.isHidden()
file.hide(); file.unhide()
file.isOwnerExecutable(); file.isGroupReadable() // etc. see file.permissions
file.size()                 // for a directory, computes the directory size
file.posixAttributes(); file.dosAttributes()  // see file.attributes
file.isEmpty(); file.nonEmpty()      // true if file has no content (or no children if directory) or does not exist and vice-versa
file.isParentOf(); file.isChildOf(); file.isSiblingOf(); file.siblings()
file("dos:system") = true  // set custom meta-data for file (similar to Files.setAttribute)

All the above APIs let you specify the LinkOption either directly:

file.isDirectory(LinkOption.NOFOLLOW_LINKS)

Or using the File.LinkOptions helper:

file.isDirectory(File.LinkOptions.noFollow)

chmod:

import java.nio.file.attribute.PosixFilePermission
file.addPermission(PosixFilePermission.OWNER_EXECUTE)      // chmod +X file
file.removePermission(PosixFilePermission.OWNER_WRITE)     // chmod -w file
assert(file.permissionsAsString() == "rw-r--r--")

// The following are all equivalent:
assert(file.permissions contains PosixFilePermission.OWNER_EXECUTE)
assert(file.testPermission(PosixFilePermission.OWNER_EXECUTE))
assert(file.isOwnerExecutable())

File comparison

Use == to check for path-based equality and === for content-based equality:

file1 == file2    // equivalent to `file1.isSamePathAs(file2)`
file1 === file2   // equivalent to `file1.isSameContentAs(file2)` (works for regular-files and directories)
file1 != file2    // equivalent to `!file1.isSamePathAs(file2)`
file1 !== file2   // equivalent to `!file1.isSameContentAs(file2)`

There are also various Ordering[File] instances included, e.g.:

val files = myDir.list.toSeq
files.sorted(File.Order.byName)
files.max(File.Order.bySize)
files.min(File.Order.byDepth)
files.max(File.Order.byModificationTime)
files.sorted(File.Order.byDirectoriesFirst)

Zip APIs

You don't have to lookup on StackOverflow "How to zip/unzip/gzip in Java/Scala?":

// Unzipping:
val zipFile: File = file"path/to/research.zip"
val research: File = zipFile.unzipTo(destination = home/"Documents"/"research")

// Zipping:
val zipFile: File = directory.zipTo(destination = home/"Desktop"/"toEmail.zip")

// Zipping in:
val zipFile = File("countries.zip").zipIn(Iterator(file"usa.txt", file"russia.txt"))()

// Zipping/Unzipping to temporary files/directories:
val someTempZipFile: File = directory.zip()
val someTempDir: File = someTempZipFile.unzip()
assert(directory === someTempDir)

Mapping over each ZipEntry:

val fileNames = zipFile.newZipInputStream.mapEntries(_.getName) // gets the file names inside the zip file

GZIP handling:

File("big-data.csv").gzipTo(File("big-data.csv.gz"))
File("big-data.csv.gz").unGzipTo(File("big-data.csv"))

// GZIP stream handling:
File("countries.gz").newInputStream().asGzipInputStream().lines.take(10).foreach(println)

def write(out: OutputStream, countries: Seq[String]) =
  out.asGzipOutputStream().printWriter().printLines(countries).close()

Lightweight ARM

Auto-close Java closeables:

for {
  in <- file1.newInputStream().autoClosed
  out <- file2.newOutputStream().autoClosed
} in.pipeTo(out)
// The input and output streams are auto-closed once out of scope

better-files provides convenient managed versions of all the Java closeables e.g. instead of writing:

for {
 reader <- file.newBufferedReader().autoClosed
} foo(reader)

You can write:

for {
 reader <- file.bufferedReader()    // returns Dispose[BufferedReader]
} foo(reader)

// or simply:
file.bufferedReader().foreach(foo)

Similarly:

for {
 reader <- file.bufferedReader()
} yield foo(reader)

// Simpler
file.bufferedReader.map(foo).get()

// Even simpler
file.bufferedReader.apply(foo)

If foo itself is lazy and depends on reader being open, you should flatMap instead of apply:

def lines(reader: BufferedReader): Iterator[String] = ???

for {
  reader <- file.bufferedReader()
  line <- lines(reader)
} yield line

// or simply
file.bufferedReader.flatMap(lines)

You can also define your own custom disposable resources e.g.:

trait Shutdownable {
  def shutdown(): Unit = ()
}

object Shutdownable {
  implicit val disposable: Disposable[Shutdownable] = Disposable(_.shutdown())
}

val s: Shutdownable = ....

for {
  instance <- new Dispose(s)
} doSomething(s)  // s is disposed after this

using syntax:

val lines: List[String] = using(file.newInputStream) { stream =>
  stream.lines.toList   // Must be eager so .toList
}

Auto-closed instances also have a useful method to generate self-closing iterators that auto closes the parent resource on exhaustion:

val lines: Iterator[String] = file.lines()  // This will auto close the underlying stream on iterator exhaustion

lines.find(_ == "hello world") //This will auto close the stream if nothing is found OR if the item is found
lines.take(10).size //This will close the stream even if stream has >10 lines

// If you don't want this auto closing behaviour
lines.nonClosing().take(10).size // This would leave stream open if it has >10 lines and only close if stream has no more elements in it

// If you don't even want it to close when underlying stream has no more elements
lines.nonClosing(closeInTheEnd = false) // This will NEVER close the underlying stream - you should probably never need to do this!

Scanner

Although java.util.Scanner has a feature-rich API, it only allows parsing primitives. It is also notoriously slow since it uses regexes and does un-Scala things like returns nulls and throws exceptions.

better-files provides a faster, richer, safer, more idiomatic and compossible Scala replacement that does not use regexes, allows peeking, accessing line numbers, returns Options whenever possible and lets the user mixin custom parsers:

val f1 = File("/tmp/temp.txt")
val data = f1.overwrite(s"""Hello World
  | 1 true
  | 2 3
""".stripMargin)
val scanner: Scanner = data.newScanner()
assert(scanner.next[String] == "Hello")
assert(scanner.lineNumber == 1)
assert(scanner.next[String] == "World")
assert(scanner.next[(Int, Boolean)] == (1, true))
assert(scanner.nextLine() == " 2 3")
assert(!scanner.hasNext)

If you are simply interested in tokens, you can use file.tokens()

Writing your own custom scanners:

sealed trait Animal
case class Dog(name: String) extends Animal
case class Cat(name: String) extends Animal

implicit val animalParser: Scannable[Animal] = Scannable {scanner =>
  val name = scanner.next[String]
  if (name == "Garfield") Cat(name) else Dog(name)
}

val scanner = file.newScanner()
println(scanner.next[Animal])

The shapeless-scanner lets you scan HLists:

val in = Scanner("""
  12 Bob True
  13 Mary False
  26 Rick True
""")

import shapeless._

type Row = Int :: String :: Boolean :: HNil

val out = Seq.fill(3)(in.next[Row])
assert(out == Seq(
  12 :: "Bob" :: true :: HNil,
  13 :: "Mary" :: false :: HNil,
  26 :: "Rick" :: true :: HNil
))

and case-classes:

case class Person(id: Int, name: String, isMale: Boolean)
val out2 = Seq.fill(3)(in.next[Person])

Simple CSV reader:

val file = """
  23,foo
  42,bar
"""
val csvScanner = file.newScanner(StringSplitter.on(','))
csvScanner.next[Int]    //23
csvScanner.next[String] //foo

File Monitoring

Vanilla Java watchers:

import java.nio.file.{StandardWatchEventKinds => EventType}
val service: java.nio.file.WatchService = myDir.newWatchService
myDir.register(service, events = Seq(EventType.ENTRY_CREATE, EventType.ENTRY_DELETE))

The above APIs are cumbersome to use (involves a lot of type-casting and null-checking), are based on a blocking polling-based model, does not easily allow recursive watching of directories and nor does it easily allow watching regular files without writing a lot of Java boilerplate.

better-files abstracts all the above ugliness behind a simple interface:

val watcher = new FileMonitor(myDir, recursive = true) {
  override def onCreate(file: File, count: Int) = println(s"$file got created")
  override def onModify(file: File, count: Int) = println(s"$file got modified $count times")
  override def onDelete(file: File, count: Int) = println(s"$file got deleted")
}
watcher.start() 
Thread.sleep(60 * 1000) // The above line starts the monitoring asynchronously

Sometimes, instead of overwriting each of the 3 methods above, it is more convenient to override the dispatcher itself:

import java.nio.file.{Path, StandardWatchEventKinds => EventType, WatchEvent}

val watcher = new FileMonitor(myDir, recursive = true) {
  override def onEvent(eventType: WatchEvent.Kind[Path], file: File, count: Int) = eventType match {
    case EventType.ENTRY_CREATE => println(s"$file got created")
    case EventType.ENTRY_MODIFY => println(s"$file got modified $count")
    case EventType.ENTRY_DELETE => println(s"$file got deleted")
  }
}

There is also an external module which gives high performance file monitoring and interpolates with better-files. See: https://github.com/gmethvin/directory-watcher#better-files-integration-scala

Akka File Watcher

better-files also provides an example of how to build a reactive file watcher based on Akka actors that supports dynamic dispatches:

import akka.actor.{ActorRef, ActorSystem}
import better.files.File.home
import better.files.FileWatcher._
import java.nio.file.{StandardWatchEventKinds => EventType}

implicit val system = ActorSystem("mySystem")

val watcher: ActorRef = (home/"Downloads").newWatcher(recursive = true)

// register partial function for an event
watcher ! on(EventType.ENTRY_DELETE) {
 case file if file.isDirectory => println(s"directory $file got deleted")
 case file                     => println(s"$file got deleted")
}

// watch for multiple events
watcher ! when(events = EventType.ENTRY_CREATE, EventType.ENTRY_MODIFY) {
 case (EventType.ENTRY_CREATE, file) => println(s"$file got created")
 case (EventType.ENTRY_MODIFY, file) => println(s"$file got modified")
}

Benchmarks

Scanner benchmarks:

> sbt "testOnly better.files.benchmarks.*"
JavaScanner              : 2191 ms
StringBuilderScanner     : 1325 ms
CharBufferScanner        : 1117 ms
StreamingScanner         :  212 ms
IterableScanner          :  365 ms
IteratorScanner          :  297 ms
BetterFilesScanner       :  272 ms
ArrayBufferScanner       :  220 ms
FastJavaIOScanner2       :  181 ms
FastJavaIOScanner        :  179 ms

YourKit supports better-files with its full-featured Java Profiler. YourKit, LLC is the creator of YourKit Java Profiler and YourKit .NET Profiler, innovative and intelligent tools for profiling Java and .NET applications.

0

Scala	Scaladoc	Maven Releases	Sonatype Snapshots
Scala 3
Scala 2.13
Scala 2.12
Scala 2.11
Scala 2.10

Name		Name	Last commit message	Last commit date
Latest commit History 1,092 Commits
.github/workflows		.github/workflows
project		project
src		src
.gitattributes		.gitattributes
.gitignore		.gitignore
.jvmopts		.jvmopts
.scalafmt.conf		.scalafmt.conf
CHANGES.md		CHANGES.md
LICENSE		LICENSE
README.md		README.md
build.sbt		build.sbt
release.sh		release.sh

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