Archive for the ‘ Erlang ’ Category

Dynamic variables hack in Erlang

One thing that jumps to the eye in functional code sources is longer-than-usual argument lists.


process(Tree, Env, Plugins, Config, ...).

It's easy to see that as a consequence of functions using arguments as sole input channel. (Global -define()'s don't qualify as input channels—they can't vary at runtime, arguments can.)

Usually it's no big hassle.[ READ MORE ]

Literal XML in Erlang with parse_transform/2

One of the things I dislike about Erlang is that it severely impairs bragging opportunities. Yesterday I wrote a module that allows writing literal XML in the source and have it parsed into Erlang structures at compile time—sort of like E4X minus the manipulation goodies at runtime (at least for now). You write: 


Doc = '<greeting>Hello!</greeting>',
io:format("~p~n", [Doc]).
And it prints…[ READ MORE ]

Installing the StartCom SSL certificate in ejabberd

The XMPP Software Foundation established an intermediate certification authority with StartCom. If you run a public federated XMPP server, in order to provide secure communication, you no longer need to buy an SSL certificate (or resort to a self-signed certificate): simply register an account at http://www.xmpp.net and follow the certificate request process[ READ MORE ]

seethrough 0.1: sub-templates, and cache-ready

Uh oh. Beware when you take an evening’s hack and put it online, as someone who knows what he’s doing might come along and turn it into something useful.

That happened to seethrough, with a patch courtesy of Joel, who added two major features:[ READ MORE ]

seethrough: a simple XML/XHTML templating system for Erlang

Speaking of winter evenings, a couple of weeks ago over Christmas I spent a few hours whipping together a simple templating system for Erlang. Today I took another couple of hours to put it under version control and to add some ideas I found in ZPT, a similar system (hat tip to Jérôme for pointing it out). [ READ MORE ]