<File.walk()> includes the provided file - is ther...

# getting-started

[Adam S]

File.walk() includes the provided file - is there a nice way to not do that, and only list the contents?

I want an equivalent to the Java stdlib File.listFiles(), which isn't nice because it returns a nullable array.

[Adam S]

└── some-dir/
    ├── a.txt
    ├── b.json
    ├── c.xml
    └── sub-contents/
        └── x.txt

I want to do

File("$basePath/some-dir").walk().maxDepth(1)

and get the files a.txt, b.json, c.xml. And not some-dir, or sub-contents

[Oleg Yukhnevich]

there a lot of new extensions for Path in stdlib (https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io.path/java.nio.file.-path/)
what could be usefull in your case:
1. https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io.path/java.nio.file.-path/for-each-directory-entry.html
2. https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io.path/java.nio.file.-path/visit-file-tree.html
3. https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io.path/java.nio.file.-path/walk.html
Of course, if it’s possible to use latest Kotlin API version (not sure when they were introduced)

[Stephan Schröder]

Oleg's functions look very nice but are still experimental. But you could create your own extension function for now:

fun File.walkFiles(maxDepth: Int): List<File> =
    this.walk().maxDepth(maxDepth).filter{it.isFile()}.toList()

if you don't need the number of Files is more efficient to return a Sequence of Files instead

fun File.walkFiles(maxDepth: Int): Sequence<File> =
    this.walk().maxDepth(maxDepth).filter{it.isFile()}