file fixer 3001

niggelstream.kts

import java.nio.file.Files
import java.nio.file.Paths

Files.walk(Paths.get("lib/"), Integer.MAX_VALUE).forEach {
    if (!Files.isDirectory(it)) {
        val oldName = it.toFile().name
        val newName = if (oldName.isPotentialPascalCase) {
            oldName.pascalCase()
        } else oldName
        Files.move(it, it.parent.resolveSibling(newName.toString()))
    }
}

fun CharSequence.pascalCase() = StringBuilder(this).pascalCase()

tailrec fun StringBuilder.pascalCase(): CharSequence {
    // Find next upper char
    val index = getNextUpperCharacter()
    if (index >= 0) {
        // Insert underscore if needed
        val newIndex = if (index != 0) {
            insert(index, "_")
            index + 1
        } else index
        // lowercase camel cased char
        setCharAt(newIndex, this[newIndex].toLowerCase())
        // Check for others
        return pascalCase()
    }
    // No work to do
    return this
}

tailrec fun CharSequence.getNextUpperCharacter(start: Int = 0): Int {
    // Out of bounds
    if (start > lastIndex) return -1
    // First is camelcased
    if (this[start].isUpperCase()) return start
    // Continue search
    return getNextUpperCharacter(start + 1)
}

val CharSequence.isPotentialPascalCase: Boolean
    get() = any(Char::isUpperCase)