Using Nitrogen I've been trying to create a desktop feeling with no visible page reloads. Most of the code is located in just one module named: nav.erl, where the navigation bar at the top is defined as:

navbar() ->
     [{list,"List"},{new,"New"},{git,"Git"},{about,"About...more

I have made a little proof of concept of how Seethrough could be used as an alternative/complement to the current record-based way of constructing the HTML with Nitrogen. The gen...more

I have recently implemented RFC 4226 and put it on github. The idea is to explore ways of providing One-Time passwords in for example an OpenID setting, or for mobile applications. An old technique where comercial solutions have been around for years. Here is the beginning of an Open Source ...more

I played around with Xmerl today and came up with yet another approach to parse the simple example in an earlier post of mine.

The OTP docs are good but unfortunately often a bit too terse. How many times haven't I been tearing my hair trying to understand some aspects...more

I've uploaded a little program named: exrefcheck, to Github, that we are using at Kreditor. It is a front end to xref that can be run as a standalone program. I find it extremely useful and I have caught nu...more

Have I told you about redbug ?

It is a command line tool for tracing in production system. It is written by my collegue Mats Cronqvist, initially to be used for the Ericsson AXD exchange.

Anyway, I find it very useful and has almost stopped inserting io:format/2 statements in...more

I just put up a demo of how to use my OpenID library, named eopenid. The demo can be accessed here.

The demo just register those who has successfully managed to authenticate themself. The ClaimedID and the Date is store...more

It is amazing that there is no decent HTML parser in the OTP distro!

As the cure, I suggest that OTP brings in the HTML parser from Mochiweb (if Bob Ippolito permits); or even better, bring in the whole of MochiWeb...

Cheers, Tobbe

Lots of non-emacs users are hacking Erlang nowadays it seems. This is all very good. However, the difference in indentation makes it a bit cumbersome when you want to contribute with some code.

Here is a nice little command that you can run on your code (if you're unsure that your indentation conforms to the standard).

I've put eldap, taken from jungerl, and put it at github. You'll find it here:

eldap at github

This way it will be easer for people to contribute (I belive that e.g ejabberd has a separate copy of eldap that has diverged from what is in jungerl).

Btw: github us great ...more

Just before summer I uploaded a little application to Erlware named dart. As an example, I can now generate a simple web-app for doing visitor registration in our reception.

Dart make use of the ewgi interface which makes it po...more

I have been trying out Erlware recently; and I like it a lot!

As an example, I created a demo application that show the use of the dsl_engine I wrote about earlier. Now, before I explain in more detail how I did this with the Erlware tools; here is how to try it out:

<...more

On my server at home I'm running a number of experimental systems written in Erlang. Many of them have a web interface that I want to ex...more

I got inspired by one of the talks at QCon 2008 in London the other week. This guy had made a DSL (Domain Specific Language) which resembled natural language.

This, I thought, would be nice to have as a layer on top of Mnesia QLC comprehensions. This way, even a non-Erlang person would be able to retreive data from a Mnesia DB. This coul...more

I just wrota a little Erlang library that implements Comet. This makes it easy to manipulate the DOM in the browser from the Erlang server side. You can get the code from my git repository (git clone git://www.tornkvist.org/domerl).

To use it, add the following to your HTML head:

<script type="text/javascript"...more

I decided to try and learn some Haskell this summer. What started this was some discussions on the Erlang mailing list about the Erlang syntax. At some point I suggested that an alternative syntax very well could be proposed as long as it could be executed on the Beam machine.

So in order to get some feeling for the syntax of other funct...more

We talked about the perms/1 function below at the #erlang channel the other day:

%% perms([1,2,3])  =>  
%%   [[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]]
perms([]) -> [[]];
perms(L)  ->
    [[H|T] || H <- L,
              T <- perms(L--[H])].

Recursive List Comprehensions l...more

On Tuesday 24th of July, there will be an ErlLounge in Stockholm. We will meet around 17:00 (5pm) on O'Learys bar, Vasagatan, close to the Central Station.

We will drink some beer and chat about Erlang as usual :-)

See you there!

--Tobbe

Deploying Yatsy, part 1.

Yatsy (Yet Another Test Server + Yaws) is a test framework for Erlang applications. In this article I will show how to make use of it. The main idea of Yatsy is that it runs in an distributed Erlang node, executing test cases, either in the same node, or in a remote...more

Now, when Emacs 22 is released, it is even easier to get to the #erlang channel at irc.freenode.net. You just need to setup a couple of things in your ~/.emacs and then type M-x irc.

Begin by loading rcirc and define the IRC server, your Nickname and the channels you wa...more

Erlang has a very useful debugger. Here comes a quick intro on howto get it running. First you must debug compile your code.

1> c(x, [debug_info]).
{ok,x}
2> m(x).  % check if it is debug compiled
Module x compiled: Date: June 4 2007, Time: 22.04
Compiler options:  [export_all,debug_info,export_all]
....
more

Since I have separated all my HTML into SGTE templates, I have no need for lots of .yaws files anymore. I still have an index.yaws though, which dispatch the incoming request depending on the type of operation to perform. If no particular operation is requested, we deliver the index ...more

I'm back again with a report from my forays into Erlang and Ajax land. This time I will try and be somewhat more consistent and keep my Blog updated continously.

If you read my earlier blog attempt you may think (based on the look of the site) that not much has happend. But things has happend! Unde...more