skratchdot/color-matrix

#!/usr/bin/env node
'use strict';
var Caman = require('caman').Caman;
var ColorMatrix = require('./color-matrix.js').ColorMatrix;
var fs = require('fs');
var path = require('path');
var matrix = new ColorMatrix();
var onecolor = require('onecolor');
var program = require('commander');
var packageInfo = require('../package.json');
var filters;

var printFilterNames = function () {
    filters = matrix.getFilters();
    console.log('Available filter names:');
    Object.keys(filters).forEach(function (filterName) {
        console.log('  ' + filterName);
    });
};

program
    .version(packageInfo.version)
    .usage('[options] <inputColor>')
    .option('-i, --input <imageFile>', 'input image file')
    .option('-o, --output <imageFile>', 'output image file')
    .option('-f, --filter <filterName>', 'filter name to use')
    .option('-v, --value <value>', 'value for the selected operation type', '')
    .option('-l, --list', 'list all the filter names')
    .parse(process.argv);

if (program.list) {
    printFilterNames();
    process.exit();
}

if (program.filter) {
    filters = matrix.getFilters();
    if (Object.keys(filters).indexOf(program.filter) === -1) {
        console.error('Invalid filter name "' + program.filter + '".\n');
        printFilterNames();
        process.exit();
    }
}

if (program.value) {
    if (program.filter === 'matrix') {
        program.value = program.value.toString()
            .replace(/[^0-9\.\-\ ]/gi, ' ')
            .replace(/[ ]+/g, ' ')
            .trim()
            .split(' ')
            .map(parseFloat);
    } else {
        program.value = parseFloat(program.value);
    }
}

if (program.input) {
    program.input = path.resolve(program.input);
    if (!fs.existsSync(program.input)) {
        console.error('The input file "' + program.input + '" does not exist.');
        process.exit();
    } else if (typeof program.output !== 'string' || program.output.length <= 0) {
        console.error('Must specify an output file when specifying an input file.');
        process.exit();
    } else {
        program.output = path.resolve(program.output);
        Caman.Filter.register('colorMatrix', function () {
            this.process('colorMatrix', function (rgba) {
                var res = matrix.transform([rgba.r, rgba.g, rgba.b, rgba.a], program.filter, program.value);
                rgba.r = res[0];
                rgba.g = res[1];
                rgba.b = res[2];
                rgba.a = res[3];
                return rgba;
            });
        });
        console.log('writing file: ' + program.output);
        new Caman([program.input, function () {
            this.colorMatrix();
            this.render(function () {
                this.save(program.output);
            });
        }]);
    }
} else {
    var color = onecolor(program.args[0] || '');
    if (!color) {
        color = onecolor('#000000');
    }
    var results = matrix.transform([
        color.red() * 255,
        color.green() * 255,
        color.blue() * 255,
        color.alpha() * 255
    ], program.filter, program.value);
    color = color.red(results[0] / 255)
        .green(results[1] / 255)
        .blue(results[2] / 255)
        .alpha(results[3] / 255);
    console.log('hex: ' + color.hex() + '\ncss: ' + color.cssa());
    process.exit();
}