package org.jetbrains.dokka

import java.io.File
import java.io.IOException

fun File.getRelativePath(name: File): File {
    val parent = parentFile ?: throw IOException("No common directory")

    val basePath = canonicalPath + File.separator;
    val targetPath = name.canonicalPath;

    if (targetPath.startsWith(basePath)) {
        return File(targetPath.substring(basePath.length))
    } else {
        return File(".." + File.separator + parent.getRelativePath(name))
    }
}

fun File.appendExtension(extension: String) = if (extension.isEmpty()) this else File(path + "." + extension)