New WordPress theme (2018 edition)

This week I replaced the previous wordpress theme on this blog with the current one.

I use Bootstrap to place widgets in my blog content, and Prism.js to do syntax highlighting on code snippets.

This is a heavily modified version of the default twentyseventeen theme, which I used as a base because of it’s good typesetting. The bootstrap-based layout is a big improvement for mobile users, who now makes up the majority of web traffic:

How to create an animated GIF from a series of images

Sometimes, you end up with a folder full of images, which you want to animate. With the open source ImageMagick tool, this is easy on the command line:

animate *.png

This will show you all of the PNG files in the folder in quick succession, like a flip book.

ImageMagick works on just about any OS. For Linux users, the package is generally imagemagick or ImageMagick:

sudo apt-get install imagemagick
yum install ImageMagick

But this blog post is about animated GIFs, so lets make one of those. This is a compact way to combine images (here and here for examples in context), gives you a re-usable at-a-glance illustration of something that changes over time.

Example from an older post:


The steps to make a good conversion command are:

  1. Check that alphabetically, your images are in order. If not, rename them:
    echo *
  2. Convert them to a GIF a few times, and find the delay that suits you (hundredths of a second between frames)
    convert -delay 80 *.png animated.gif
  3. Choose an output size (width x height):
    convert -resize 415x -delay 80 *.png animated.gif
  4. Compress with -Layers Optimize for a smaller file:
    convert -resize 415x -delay 80 *.png -layers Optimize animated.gif


  • Generated thumbnails usually take the first frame only, which is why we ask Imagemagick to resize it (WordPress users: Choose “Full Size”).
  • To pause at the start of the loop for a moment, just copy the first image a few times.

New WordPress theme

Since the last major revision of my site setup, I’ve been including more technical content, which would be easier to read with syntax highlighting and tabs.

The most visible part of the transition is now complete:

The old theme was Skittlish, but I decided to move to a new theme which was based on Bootstrap, so that I could use its components. The new theme is a modified version of the default twentyfourteen theme, using the visual style of morphic, with Prism.js added for code highlighting.

Successful migration to WordPress in 3 easy steps

We made the decision in January to migrate our website to a WordPress installation, which is the CMS of choice for most blogs.

This posed a big challenge, mainly because we had been using our in-house CMS to publish content for the past 2 years, meaning our content was tied up in a difficult-to-export format.

Still, it allowed me to dig into the nifty and well-developed world of WordPress. My magic formula for a WordPress migration, in a nutshell:

  1. Export your old blog as something WordPress can understand.
  2. Hack at the theme until your site is beautiful.
  3. Don’t break your URL’s.

1. Export your blog

Depending on how you are blogging already, you may be able to save an export which can be loaded into WordPress with a plugin (see Importing Content on the WordPress wiki).

We were not in this lucky category, so I delved into the WXR (WordPress eXtended RSS) format. This example file was a big help, and I wrote up a short PHP script to create a similar-looking file from my blog.

2. Hack at the theme

We adapted our site from the ‘Skittlish’ theme, which has also been ported to WordPress. Every theme carries some baggage, so I highly suggest rolling up your sleeves and opening wp-content/themes on your blog.

All non-feature modifications are done in WordPress via themes, so keep tweaking it until you’re happy, or get a designer to put together a theme that suits your needs.

3. Don’t break your URL’s

I link between blog posts a lot, and breaking these links would be mind-numbing to clean up after (and a SEO sin). Using the import method above, I used article titles which matched the old permalinks.

WordPress then lets you configure permalinks to use this field, replicating the old behavior and keeping everybody happy.


If you run WordPress on your site, then it makes sense to have somebody on your team who really knows how it works.

If your initial setup is not handled with care, then you could end up wasting several days of work checking old content for errors.

Good luck!