Jacek Podkanski bigos

Delimited Continuations

Delimited continuations manipulate the control flow of programs. Similar to control structures like conditionals or loops they allow to deviate from a sequential flow of control.

We use exception handling as another example for control flow manipulation and later show how to implement it using delimited continuations. Finally, we show that nondeterminism can also be expressed using delimited continuations.

Exception Handling

Ruby Rogues Ruby Nuby Project Submitted Videos

Ubuntu 12.04, Ruby, Rails, Nginx, Unicorn and git-deploy

In the seemlingly endless search for the actual correct and easy way to deploy a Rails app, we have tried several ways. We tried out using Apache2 and running a cluster of Thin servers. With the built in threading of Puma we decided to use it with Nginx.

Server Setup

Create new server
Login to new server
- ssh username@IPaddress (you can also use the domain name if you have the DNS setup already)
- accept the RSA key

Books

Algorithms and Data Structures

The Art of Computer Programming (Knuth)

Programming Pearls (Bentley)

Data Structures and Algorithms (Aho, Hopcroft, Ullman)

Reader Macros in Common Lisp

This post also appears on lisper.in.

Reader macros are perhaps not as famous as ordinary macros. While macros are a great way to create your own DSL, reader macros provide even greater flexibility by allowing you to create entirely new syntax on top of Lisp.

Paul Graham explains them very well in [On Lisp][] (Chapter 17, Read-Macros):

The three big moments in a Lisp expression's life are read-time, compile-time, and runtime. Functions are in control at runtime. Macros give us a chance to perform transformations on programs at compile-time. ...read-macros... do their work at read-time.

	=Navigating=
	visit('/projects')
	visit(post_comments_path(post))

	=Clicking links and buttons=
	click_link('id-of-link')
	click_link('Link Text')
	click_button('Save')
	click('Link Text') # Click either a link or a button
	click('Button Value')

	/* Add this CSS to your store Styles section under CSS mode */
	/* http://www.storenvy.com/ */

	/* Photo Slider */
	.product_photo_slider {
	background: #fff; /: Product Slider Background :/
	border: 5px solid #eaeaea; /: Product Slider Border :/
	color: #555; /: Product Slider Product Description :/
	display: block;
	margin-left:8px;

	# Checkout latest guile-emacs

	#git clone git://git.hcoop.net/git/bpt/emacs.git


	# apply the patch to get it to compile with latest guile.
	cat <<EOF>>/tmp/gemacs.diff
	"diff --git a/src/lisp.h b/src/lisp.h
	index a907105..5ec9644 100644
	--- a/src/lisp.h

	# Rails 4 Application Template
	# Remove normal files we don't want
	remove_file "README.rdoc"
	remove_file "public/index.html"
	remove_file "app/assets/images/rails.png"

	# Copy database.yml and secrets.yml to sample
	inside "config" do
	run "cp database.yml database.yml.sample"
	run "cp secrets.yml secrets.yml.sample"

	#!/bin/bash

	# Build latest version of Emacs, version management with stow
	# OS: Ubuntu 14.04 LTS
	# version: 24.5
	# Toolkit: lucid

	# Warning, use updated version of this script in: https://github.com/favadi/build-emacs

	set -e