Unzip a file in kotlin script [.kts]

Question

I was toying with the idea of rewriting some existing bash scripts in kotlin script.

One of the scripts has a section that unzips all the files in a directory. In bash:

unzip *.zip

Is there a nice way to unzip a file(s) in kotlin script?

Answer 1

The easiest way is to just use exec unzip (assuming that the name of your zip file is stored in zipFileName variable):

ProcessBuilder()
    .command("unzip", zipFileName)
    .redirectError(ProcessBuilder.Redirect.INHERIT)
    .redirectOutput(ProcessBuilder.Redirect.INHERIT)
    .start()
    .waitFor()

The different approach, that is more portable (it will run on any OS and does not require unzip executable to be present), but somewhat less feature-full (it will not restore Unix permissions), is to do unzipping in code:

import java.io.File
import java.util.zip.ZipFile

ZipFile(zipFileName).use { zip ->
    zip.entries().asSequence().forEach { entry ->
        zip.getInputStream(entry).use { input ->
            File(entry.name).outputStream().use { output ->
                input.copyTo(output)
            }
        }
    }
}

If you need to scan all *.zip file, then you can do it like this:

File(".").list { _, name -> name.endsWith(".zip") }?.forEach { zipFileName ->
    // any of the above approaches        
}

or like this:

import java.nio.file.*

Files.newDirectoryStream(Paths.get("."), "*.zip").forEach { path ->
    val zipFileName = path.toString()
    // any of the above approaches        
}