working.js

#!/usr/bin/node

var canvg = require("canvg");
var Canvas = require("canvas");
fs = require('fs')

var svg_input;

var args = process.argv.slice(2);

var input_file = args[0];
var output_file = args[1];

var doit = function() {
fs.readFile(input_file, 'utf8', function (err,data) {
      if (err) {
        return console.log(err);
      }

      svg_input = data;

      var canvasMethods = [ "arc", "arcTo", "beginPath", "bezierCurveTo", "clearRect", "clip", "closePath", "createImageData", "createLinearGradient", "createPattern", "createRadialGradient", "drawCustomFocusRing", "drawImage", "drawSystemFocusRing", "fill", "fillRect", "fillText", "getImageData", "getLineDash", "isPointInPath", "isPointInStroke", "lineTo", "measureText", "moveTo", "putImageData", "quadraticCurveTo", "rect", "restore", "rotate", "save", "scale", "scrollPathIntoView", "setLineDash", "setTransform", "stroke", "strokeRect", "strokeText", "transform", "translate" ];

      function convert() {
        //var svgString = $.trim($('#svg-input').val());
        var svgString = svg_input;
        //var canvas = $("#output")[0];
        var fakeCanvas = {
          _output: "",
          getContext: function() {
            return this;
          },
          canvas: {
            clientWidth: 600,
            clientHeight: 600
          }
        }

        cvd = {
          logCommand: function(c) {
            fakeCanvas._output += c + "\n";
          },
          getOutput: function() {
            return fakeCanvas._output;
          }
        }

        for (var i = 0; i < canvasMethods.length; i++) {
          (function() {
            var method = canvasMethods[i];
            fakeCanvas[method] = function() {
              var args = Array.prototype.slice.call(arguments);
              this._output += "ctx." + method + "(" + args.join(", ") + ");\n";
            }
          })()
        }

        canvg(fakeCanvas,  svgString, { ignoreMouse: true, ignoreDimensions: true });

        var result =  'var draw = function(ctx) {\n' + cvd.getOutput() + '};\n'

        return result;
      }

      var retVal = convert();

      fs.writeFile(output_file, retVal, function(err) {
          if(err) {
              console.log(err);
          } else {
              console.log("The file was saved!");

          }
      });
});

console.log ("finished");
};

doit();