MountPoint.kt

import java.io.File
import java.util.regex.Matcher
import java.util.regex.Pattern

fun String.toFile() = File(this)

operator fun Matcher.get(group: Int): String = group(group)!!

data class MountPoint(
    val device: String,
    val point: String,
    val system: String,
    val dump: String,
    val option: String,
    val fsk1: String,
    val fsk2: String
) {

    companion object {

        private const val PROC_MOUNTS = "/proc/mounts"

        fun read() = mutableListOf<MountPoint>().apply {
            val pattern = Pattern.compile(
                "^(\\S+)\\s+(\\S+)\\s+(\\S+)\\s+(([a-z]+)[,\\S+]+)[\\s]*(\\d)?[\\s]*(\\d)?\$"
                // device    point     system    option   dump           fsk            fsk
            )
            PROC_MOUNTS.toFile().useLines { lines ->
                lines.forEach { line ->
                    val matcher =
                        pattern.matcher(line).takeIf { it.matches() } ?: return@forEach
                    add(matcher.run {
                        MountPoint(
                            device = this[1],
                            point = this[2],
                            system = this[3],
                            dump = this[4],
                            option = this[5],
                            fsk1 = this[6],
                            fsk2 = this[7]
                        )
                    })
                }

            }
        }

    }

}