Archives for the ‘Programming’ Category

WordPress permissions on

“To perform the requested action, connection information is required.” My earlier post on WordPress with was too hastily written. There are more issues than WP not wanting to use the direct upgrader, and editing WordPress code is not the right way to solve it either. Problem 1: WordPress doesn’t want to use the direct […]

Scheme in Javascript

Scheme’s power to simplicity ratio makes it a fun target for implementation. Today, I introduce a couple new ways of running Scheme powered by Javascript. The first is an online Scheme interface that I’ve been working on sporadically for the last few months. Inspired by TryHaskell, it began as a series of patches to jquery-console, […]

Convert PHP to static pages with GNU Make

I recently moved an old website to a new server. For performance reasons, the new server is running nginx instead of Apache, and didn’t have nginx set up to use PHP. (The optimal way, apparently, is to use PHP-FGM, which currently requires you to patch and build PHP yourself, at least until PHP 5.4). That […]

Android emulator temp directories

If you are using the Android SDK on a shared computer, you might run into the awesome “NAND: could not create temp file for system NAND” error. This is because “/tmp/android” is hardcoded into the emulator as the directory to start temporary files during emulation, and somebody else has likely claimed it first. The easiest […]

Our friend Scope

Scope is one of those things that is absolutely essential to understand as a programmer. If you don’t understand how a language handles scope, you are doomed to continue making difficult-to-understand mistakes and poor code design. Scheme is a good platform for exploring how scope works for beginners, and the language features that it has […]

Chicken-NBT: A Minecraft NBT reader for Chicken Scheme

I didn’t see any Scheme code to read Minecraft NBT data files, so I made one. And in doing so, I see why there weren’t any NBT readers in Scheme. (Haskell programmers can use Adam Foltzer’s much cleaner Haskell version.) When I found out that there was a gzip egg called z3, I thought my […]

Writing reusable JavaScript

One of the biggest hurdles in going from JavaScript as a trivial gimmick for making divs change color to a powerful language for building real applications is its single-namespace weakness. It’s easy to accidentally cause variable names to collide when you start combining scripts, and there’s no native library or module system to alleviate this. […]

The empty list in BiwaScheme

I’ve been looking around for Scheme interpreters written in JavaScript for a while now. The original idea was to make some kind of interactive online teaching tool, like an interactive version of The Little Schemer. Googling for “javascript scheme” turns up a few implementations:

HTML templating in Scheme?

Templating is one of those must-haves for building websites; separating content from presentation is sliced bread compared to cavalierly interleave logic and HTML into one file. In Scheme, I think that quasiquotation could be used in wonderful ways to create templates; namely, every template can be a function that simply takes parameters and directly uses […]

Petite Chez Scheme for Ubuntu

An Ubuntu package of Petite Chez Scheme seems to be a common request among students, given the popularity of Ubuntu among the techno-capable. ¬†Currently, only RPM packages are provided on the Chez Scheme site, and the traditional recommendation was to use alien to convert the RPM into a .deb. There’s no reason to have everybody […]