iOS image assets to Andorid DIP buckets

ios2and.php

#!/usr/bin/php
<?php
/**
 * Very simple script to convert iOS xcode imageset directories to DIP buckets
 * for Android development
 */

if(!isset($argv[2])) {
    die("Usage: ios2and.php <ios image asset folder> <android res folder>\n");
}

$ios = $argv[1];
$and = $argv[2];

foreach(glob("$ios/*.imageset/Contents.json") as $jsonfile) {
    $setdir = dirname($jsonfile);
    $setname = basename($setdir, '.imageset');
    $setname = strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2', $setname));

    $json = json_decode(file_get_contents($jsonfile), true);
    foreach($json['images'] as $img) {

        switch(strtolower($img['scale'])) {
            case '1x':
                $dip = 'mdpi';
                break;
            case '2x':
                $dip = 'xhdpi';
                break;
            case '3x':
                $dip = 'xxhdpi';
                break;
            default:
                continue;
        }

        if(!$img['filename']) continue;

        $from = "$setdir/".$img['filename'];
        $to   = "$and/drawable-$dip/$setname.png"; #FIXME handle extensions
        @mkdir(dirname($to), 0777, true);
        copy($from, $to);
        echo "$from -> $to\n";
    }
}