Technology Tales

Adventures & experiences in contemporary technology

Another look at Drupal

20th January 2010

Early on in the first year of this blog, I got to investigating the use of Drupal for creating an article-based subsite. In the end, the complexities of its HTML and CSS thwarted my attempts to harmonise the appearance of web pages with other parts of the same site and I discontinued my efforts. In the end, it was Textpattern that suited my needs and I have stuck with that for the aforementioned subsite. However, I recently spotted someone very obviously using Drupal in its out of the box state for a sort of blog (there is even an extension for importing WXR files containing content from a WordPress blog); they even hadn’t removed the Drupal logo. With my interest rekindled, I took another look for the sake of seeing where things have gone in the last few years. Well, first impressions are that it now looks like a blogging tool with greater menu control and the facility to define custom content types. There are plenty of nice themes around too though that highlights an idiosyncrasy in the sense that content editing is not fully integrated into the administration area where I’d expect it to be. The consequence of this situation is that pages, posts (or story as the content type is called) or any content types that you have defined yourself are created and edited with the front page theme controlling the appearance of the user interface. It is made even more striking when you use a different theme for the administration screens. That oddity aside, there is a lot to recommend Drupal though I’d try setting up a standalone site with it rather than attempting to shoehorn it as a part of an existing one like what I was trying when I last looked.

Where’s WordPress 2.8?

7th May 2009

It now seems that WordPress 2.7 has been an unqualified success. The major changes that were made to the administration screens have been well received and the grumblings that were extant about 2.5 and 2.6 seem to have dissipated too. Another observation is that security bugs have not being making their presence felt. All in all, it feels very much like assured progress and may explain why 2.8 has been taking its time in coming.

It’s now pencilled in for the end of this month and looks as if it will be a polishing of what already works well. It seems to me that most of the changes are behind the scenes but there is a new widgets interface that should be ever more user friendly together with an automated theme installation and upgrade facility that is based on what is already in place for plugins (speaking of which, that interface has been tidied too). Another rough edge that has been removed is the whole business of time zones and daylight saving time. In summary, it seems to be a sharpening of a package that already works well anyway. I have been running it on another site without a whimper of drama so that’s probably saying something. Saying that, quite how they are going to get anyone to upgrade is another matter. For one thing, Lorelle VanFossen’s overuse of the word “mandatory” cannot be likely to do it…

In a way, the subject of upgrade fatigue brings me to a recent poll run by Automattic’s Jane Wells. Quite a number want to stick with what works while others fancy a change. This split could be tricky to manage and might even encourage some not to upgrade at all and stick with what works for them. After all, there were two episodes of major upheaval last year and I cannot see everyone wanting to see that happen again. Continual evolutionary freshening would suit me better. Thankfully, any talk of changing the administration screens has been left for 2.9 now and there’s always the option of sticking with 2.8 if what is produced becomes a sufficient irritation. Well, it saves a leap to Habari or another alternative anyway…

Controlling the post revision feature in WordPress 2.6

21st July 2008

This may seem esoteric for some but I like to be in control of the technology that I use. So, when Automattic included post revision retention to WordPress 2.6, I had my reservations about how much it would clutter my database with things that I didn’t need. Thankfully, there is a way to control the feature, but you won’t find the option in the administration screens (they seem to view this as an advanced setting and so don’t want to be adding clutter to the interface for the sake of something that only a few might ever use); you have to edit wp-config.php yourself to add it. Here are the lines that can be added and the effects that they have:

Code: define('WP_POST_REVISIONS','0');

Effect: turns off post revision retention

Code: define('WP_POST_REVISIONS','-1');

Effect: turns it on (the default setting)

Code: define('WP_POST_REVISIONS','2');

Effect: only retains two previous versions of a post (the number can be whatever you want so long as it’s an integer with a value more than zero).

Update (2008-07-23):

There is now a plugin from Dion Hulse that does the above for you and more.

Useful keyboard shortcuts for managing the window sizes of Windows applications

9th June 2008

Maximising and minimising windows is all part and parcel of using window-based user interfaces so it’s nice to know that there are keyboard shortcuts that reduce the need to use your mouse all of the time. Here are a few that work in Windows:

Alt+Space+N   Minimise

Alt+Space+X   Maximise

Alt+Space+R   Restore (set to default)

HennessyBlog theme update

12th February 2007

Over the weekend, I have been updating the theme on my other blog, HennessyBlog. It has been a task that projected me onto a learning curve with the WordPress 2.1 codebase. I have collected what I encountered so I know that it’s out there on the web for you (and I) to use and peruse. It took some digging to get to know some of what you find below. Any function used to power WordPress takes some finding so I need to find one place on the web where the code for WordPress is fully documented. The sites presenting tutorials on how to use WordPress are more often than not geared towards the non-techie rather than code cutters like myself. Then again, they might be waiting for someone to do it for them…

The changes made are as follows:

Tweaks to the interface

These are subtle with the addition of navigation controls to the sidebar and the change in location of the post metadata being the most obvious enhancements. “Decoration” with solid and dashed lines (using CSS border attributes rather than the deprecated hr tagset) and standards compliance links.

Standards compliance

Adding standards compliance links does mean that you’d better check that all is in order; it was then that I discovered that there was work to be done. There is an issue with the WordPress wpautop function (it lives in the formatting.php file) in that it sometimes doesn’t add closing tags. Finding out that it was this function that is implicated took a trip to the WordPress.org website; a good rummage in the wp-includes folder does a lot but it can’t achieve everything.

Like a lot of things in the WordPress code, the wpautop function isn’t half buried. The the_content function (see template-functions-post.php) used to output blog entries calls get_content function (also in template-functions-post.php) to extract the data from mySQL. The add_filter function (in plugin.php) associates the wpautop function and others with get_the_content function and the p tags get added to the output.

To return to the non-ideal behaviour that caused me to start out on the above quest, an example is where you have an img tag enclosed by div tags. The required substitution involves the use of regular expressions that work most of the time but get confused here. So adding a hack to the wpautop function was needed to change the code so that the p end tag got inserted. I’ll be keeping an eye out for any more scenarios like this that slip through the net and for any side effects. Otherwise, compliance is just making sure that all those img tags have their alt attributes completed.

Tweaks to navigation code

Most of my time has been spent on tweaking of the PHP code supporting the navigation. Different functions were being called in different places and I wanted to harmonise things. To do this, I created new functions in the functions.php for my theme and needed to resolve a number of issues along the way. Not least among these were regular expressions used for subsetting with the preg_match match that weren’t to my eyes Perl-compliant, as would be implied by the choice of function. I have since found that PCRE’s in PHP use a more pragmatic syntax but there remained issues with the expressions that were being used. They seemed to behave OK in their native environment but fell out of favour within the environs of my theme. Being acquainted with Perl, I went for a more familiar expression style and the issue has been resolved.

Along the way, I broke the RSS feed. This was on my off-line test blog so no one, apart from myself, that is, would have noticed. After a bit of searching, I realised that some stray white-space from the end of a PHP file (wp-config.php being a favourite culprit), after the PHP end tag in the script file as it happens, was finding its way into the feed and causing things to fall over. Feed readers don’t take too kindly to the idea of the XML declaration not making an appearance on the first line of the file. The refusal of Firefox to refresh things as it should caused some confusion until I realised that a forced refresh of the feed display was needed -- sometimes, it takes a while for an addled brain to think of these kinds of things.

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