resources.js

#!/usr/bin/env node
/**
Resources generator

Generate icons for mobile/tablet according to iOS/Android specifications.

Takes an image 'icon.png' and outputs to pre-existing directories res/*

Requires Imagemagick (imagemagick.org)

See Also: ninepatch.js; Android 9-patch (http://developer.android.com/tools/help/draw9patch.html)
TODO: iOS html splash

circa 2015
*/
(function(specification) {
    var shell = require('child_process');
    for (var location in specification){
    	// create directories if necessary
    	var mkdirp = 'mkdir -p ' + location;
    	//console.log(mkdirp);
    	shell.exec(mkdirp, out);
    	// create each variant in each target directory
        for (var namesize in specification[location])
            (location + specification[location][namesize])
            .replace(/(^\S+) (\d+)x(\d+)?/,
                function(spec, output, width, height) {
                    var convert = '/opt/local/bin/convert icon.png ' +
                        (width == height ?
                        	// create icon
                            '-resize ' + width :
                            // or create splashscreen
                            '-gravity center' + 
                            	' -resize ' + Math.floor((Math.min(width, height)) / 5.333) +
                            	' -extent ' + width + 'x' + height)
                        + ' ' + output;
                    console.log(convert);
                    shell.exec(convert, out);
                });
    }
})({
    'res/ios/': [
        'iTunesArtwork.png 1024x1024',

        'Icon-120.png 120x120',
        '[email protected] 180x180',
        'Icon-76.png 76x76',
        '[email protected] 167x167',
        '[email protected] 152x152',

        '[email protected] 640x960',
        '[email protected] 640x1136',
        '[email protected] 750x1334',
        '[email protected] 1242x2208',
        '[email protected] 2208x1242',
        'Default-PortraitRetina.png 768x1024',
        '[email protected] 1536x2048',
        'Default-LandscapeRetina.png 1024x768',
        '[email protected] 2048x1536',
        '[email protected] 2208x1242',

        'Icon-40.png 40x40',
        '[email protected] 80x80',
        '[email protected] 120x120',

        'Icon-29.png 29x29',
        '[email protected] 80x80',
        '[email protected] 87x87'
    ],

    'res/android/': [
        'display-ldpi-icon.png 36x36',
        'display-mdpi-icon.png 48x48',
        'display-hdpi-icon.png 72x72',
        'display-xhdpi-icon.png 96x96',
        'display-xxhdpi-icon.png 144x144',
        'display-xxxhdpi-icon.png 192x192'
    ]
});

function out(error, stdout, stderr) {
    stdout && console.log(stdout);
    stderr && console.log(stderr);
    if (error)
        console.log(error);
}

/*
	see also:
		search:
			"icons for universal apps" site:developer.apple.com
		https://developer.apple.com/library/ios/qa/qa1686/_index.html
*/