ingoradatz

(function(){


    var currentETag;

    onLoad(function pageLoaded() {
        console.log('starting live reload');
        if (window.EventSource) return eventsource();
        else setInterval(polling, 1500);
    });

ingoradatz

How to set up stress-free SSL on an OS X development machine

One of the best ways to reduce complexity (read: stress) in web development is to minimize the differences between your development and production environments. After being frustrated by attempts to unify the approach to SSL on my local machine and in production, I searched for a workflow that would make the protocol invisible to me between all environments.

Most workflows make the following compromises:

• Use HTTPS in production but HTTP locally. This is annoying because it makes the environments inconsistent, and the protocol choices leak up into the stack. For example, your web application needs to understand the underlying protocol when using the secure flag for cookies. If you don't get this right, your HTTP development server won't be able to read the cookies it writes, or worse, your HTTPS production server could pass sensitive cookies over an insecure connection.

• Use production SSL certificates locally. This is annoying

ingoradatz

// data comes from here http://stat-computing.org/dataexpo/2009/the-data.html
// download 1994.csv.bz2 and unpack by running: cat 1994.csv.bz2 | bzip2 -d > 1994.csv
// 1994.csv should be ~5.2 million lines and 500MB
// importing all rows into leveldb took ~50 seconds on my machine

// there are two main techniques at work here:
// 1: never create JS objects, leave the data as binary the entire time (binary-split does this)
// 2: group lines into 16 MB batches, to take advantage of leveldbs batch API (byte-stream does this)

var level = require('level')

ingoradatz

jQuery.fn.brightness = function() {
  var bg_color, rgba, y;
  bg_color = this.css('background-color');
  if ((bg_color != null) && bg_color.length) {
    rgba = bg_color.match(/^rgb(?:a)?\(([0-9]{1,3}),\s([0-9]{1,3}),\s([0-9]{1,3})(?:,\s)?([0-9]{1,3})?\)$/);
    if (rgba != null) {
      if (rgba[4] === '0') {
        if (this.parent().length) return this.parent().brightness();
      } else {
        y = 2.99 * rgba[1] + 5.87 * rgba[2] + 1.14 * rgba[3];

ingoradatz

L.Control.Button = L.Control.extend({
  options: {
    position: 'bottomleft'
  },
  initialize: function (options) {
    this._button = {};
    this.setButton(options);
  },

ingoradatz

Part 1

Proof of concept

Say, you want to save your D3 application in a CouchDB database. This is just a proof of concept that this is possible. I use the »Focus + Context« diagram by Mike Bostock (http://bl.ocks.org/1667367) as an example.

Prerequisites:

• A running CouchDB (see http://couchdb.apache.org/; in my Windows installation CouchDb is started as a Windows service when Windows starts).
• An installation of couchapp (how to install couchapp, see http://couchapp.org/page/index).
• Your favorite editor.

ingoradatz

var fs = require("fs");
var path = require("path");

var rmdir = function(dir) {
	var list = fs.readdirSync(dir);
	for(var i = 0; i < list.length; i++) {
		var filename = path.join(dir, list[i]);
		var stat = fs.statSync(filename);
		
		if(filename == "." || filename == "..") {

ingoradatz

#covert an image in the clipboard to a 57x57 rgb icon and store base64 version of it into the clipboard.
#if an image is not in the clipboard the base64 string 'b64str' will be loaded and displayed.
#after running the 1st time replace the contents of b64str with the clipboard.

from PIL import Image
import clipboard
from StringIO import *
import base64

b64str="""

ingoradatz

1. Introduction to the replicator database

A database where you PUT/POST documents to trigger replications and you DELETE to cancel ongoing replications. These documents have exactly the same content as the JSON objects we used to POST to /_replicate/ (fields "source", "target", "create_target", "continuous", "doc_ids", "filter", "query_params".

Replication documents can have a user defined "_id". Design documents (and _local documents) added to the replicator database are ignored.

The default name of this database is _replicator. The name can be changed in the .ini configuration, section [replicator], parameter db.

2. Basics

ingoradatz

var targetDB = 'db';
var blacklist = ['_design/']
$.couch.db(targetDB).allDocs({'success':function(all_docs){
  for (var i = 0; i < all_docs.rows.length; ++i) {
    var docId = all_docs.rows[i].id;
    if (blacklist.indexOf(docID) === -1) {
     $.couch.db(targetDB).openDoc(docId, {'success':function(doc){
       $.couch.db(targetDB).removeDoc(doc);
     }});
    }