#! /usr/bin/env node

/*************************************************************************
 *
 *  tex2png
 *
 *  Uses MathJax and batik to convert a TeX or LaTeX string to
 *  a PNG image.
 *
 * ----------------------------------------------------------------------
 *
 *  Copyright (c) 2014 The MathJax Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

var mjAPI = require("../lib/mj-single.js");

var argv = require("yargs")
  .demand(1).strict()
  .usage("Usage: tex2png [options] 'math' > file.png",{
    inline: {
      boolean: true,
      describe: "process as in-line TeX"
    },
    linebreaks: {
      boolean: true,
      describe: "perform automatic line-breaking"
    },
    dpi: {
      default: 0,
      describe: "dpi for image (0 = calculate automatically)"
    },
    font: {
      default: "TeX",
      describe: "web font to use"
    },
    ex: {
      default: 6,
      describe: "ex-size in pixels"
    },
    width: {
      default: 100,
      describe: "width of container in ex"
    },
    extensions: {
      default: "",
      describe: "extra MathJax extensions e.g. 'Safe,TeX/noUndefined'"
    }
  })
  .argv;

if (argv.font === "STIX") argv.font = "STIX-Web";
mjAPI.config({MathJax: {SVG: {font: argv.font}}, extensions: argv.extensions});
mjAPI.start();

if (argv.dpi === 0) {argv.dpi = argv.ex * 16} // pixels properly sized

mjAPI.typeset({
  math: argv._[0],
  format: (argv.inline ? "inline-TeX" : "TeX"),
  png:true, dpi:argv.dpi,
  ex: argv.ex, width: argv.width,
  linebreaks: argv.linebreaks
}, function (data) {
  if (!data.errors) {process.stdout.write(new Buffer(data.png.slice(22),'base64'))}
});