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Thursday, October 16, 2014

Extending the behavior of XMonad Layouts


This article is about three things I'm very interested in. I've been a fan of using real programming languages for configuration files for a long time, but haven't written about that recently. I've been using tiling window managers - now in their dynamic version - for a long time as well, and have written about that. Finally, I've been a fan of Haskell for a while, and have written a number of articles about using it.
XMonad is a dynamic, tiling window manager written in Haskell that uses a Haskell module as a configuration file. This has the usual advantages of doing so - you can put values in variables rather than repeating them, and construct new values with Haskell expressions, etc.
One of the features of XMonad is a Layout, which controls how windows are tiled on the screen. The core of XMonad provides some basic - but very useful - Layouts, and there are extensions to do things like creating tabbed stacks of windows, nesting Layouts, etc.
Since Layouts control how windows are arranged, they are critical components, and changing them is how you change your window managers behavior. I'm going to look at extending the behavior of one of the core Layouts - Tall - in a number of ways.

Monday, May 12, 2014

Web apps that write like console apps

My history with the web

When the web first showed up, I was delighted. Here was a tool I could use to release cross-platform apps by releasing one app. Since I was working for a multi-platform software vendor, this was great - we had people with Macs, Windows machines, and most of the available Unix workstations. Now I could write an app once and they could all use it.
So I started automating some of the things we hadn't done before because we couldn't reach the entire audience or afford to alienate those we couldn't reach. Write an HTML page or two, the code to process the input, and then write out the results, and we're done. All fun, easy and productive.
Then something evil happened. Web templates. Suddenly, it wasn't about writing code any more. It was about writing templates, then writing code fragments to plug values into the holes. Worse yet, most template systems broke the better web text authoring tools, at least until those tools were taught about that template language. They had the same effect on web text processing tools. Writing for the web was no longer fun, easy or productive. So I stopped.
And every time I've looked at web application tools since, it seems there's been another level of complications added to paper over the problems with template systems. Routes. Adapters. Messy config files. A simple app might have more text in config files than in code. And this is seriously considered a good thing?

Thursday, May 1, 2014

How pythonic is Haskell?


I've recently switched to Haskell from Python, and I think it might be interesting to look at how far from being Pythonic Haskell actually is - how much of a change did I actually make?