Reformat.kt

package com.squareup.refmt

import okio.Okio
import java.io.File

fun main(args: Array<String>) {
    val directory = File(args[0])
    Reformatter().reformatDirectory(directory)
}

class Reformatter {
    fun reformatDirectory(directory: File, indent: String = "") {
        if (directory.name.startsWith(".")) return // .git, .gradle, .idea

        println("${indent}reformatting ${directory.name}/")

        for (child in directory.listFiles()) {
            if (child.isDirectory) {
                reformatDirectory(child, indent + "  ")
            } else if (child.name.endsWith(".kt")) {
                reformatKotlin(child, indent + "  ")
            }
        }
    }

    private fun reformatKotlin(file: File, indent: String) {
        println("${indent}reformatting ${file.name}")

        val reformatted = File("${file}_reformatted")
        Okio.buffer(Okio.sink(reformatted)).use { sink ->
            Okio.buffer(Okio.source(file)).use { source ->
                while (true) {
                    val line = source.readUtf8Line() ?: break
                    sink.writeUtf8(reformatLine(line))
                    sink.writeUtf8("\n")
                }
            }
        }
        reformatted.renameTo(file)
    }

    private fun reformatLine(line: String): String {
        var spaceCount = 0
        for (c in 0 until line.length) {
            if (line[c] == ' ') {
                spaceCount++
            } else {
                break
            }
        }

        return line.substring(spaceCount / 2)
    }
}

I created a shell script called reformat_misk that runs the above on the current working directory. Then I run it like so to reformat a given branch. Running in on --all will reformat everything!

git filter-branch  -f  --tree-filter reformat_misk -- master_reformatted

cool!