package com.infendro.shell

import kotlinx.cinterop.CPointer
import kotlinx.cinterop.refTo
import kotlinx.cinterop.toKString
import platform.posix.*

internal actual suspend fun execute(
    command: Array<String>,
    directory: String?,
): Shell.Result {
    val command = command.joinToString(" ") { "\"$it\"" }
    if (directory != null) {
        chdir(directory)
    }
    val stream = popen(command, "r")!!
    val value = stream.readLines().joinToString("")
    val code = pclose(stream)
    return Shell.Result(code, value)
}

private fun CPointer<FILE>.readLines(): List<String> {
    val lines = mutableListOf<String>()
    val buffer = ByteArray(4096)
    while (true) {
        val line = fgets(buffer.refTo(0), buffer.size, this)
        if (line == null) break
        lines.add(line.toKString())
    }
    return lines
}