Tag: php

Identifying Post Kinds in WordPress RSS Feeds

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I use the Post Kinds plugin to streamline the management of the different types of posts I make on my blog, based on the IndieWeb post types list: articles, like this one, are “conventional” blog posts, but I also publish notes (which are analogous to “tweets”), reposts (“shares” of things I’ve found online, sometimes with commentary), checkins (mostly chronicling my geocaching/geohashing), and others: I’ve extended Post Kinds to facilitate comics and reviews, for example.

But for people who subscribe (either directly or indirectly) to everything I post, I imagine it must be a little frustrating to sometimes be unable to identify the type of a post before clicking-through. So I’ve added the following code, which I’m sharing here and on GitHub in case it’s of any use to anybody else, to my theme’s functions.php:

// Make titles in RSS feed be prefixed by the Kind of the post.
function add_kind_to_rss_post_title(){
	$kinds = wp_get_post_terms( get_the_ID(), 'kind' );
	if( ! isset( $kinds ) || empty( $kinds ) ) return get_the_title(); // sanity-check.
	$kind = $kinds[0]->name;
	$title = get_the_title();
	return trim( "[{$kind}] {$title}" );
}
add_filter( 'the_title_rss', 'add_kind_to_rss_post_title', 4 ); // priority 4 to ensure it happens BEFORE default escaping filters.

This decorates the titles of my posts, but only in my feeds, so it’s easier for people to tell at-a-glance what’s going on:

Rendered RSS feed showing Post Kinds prefixes

Down the line I might expand this so that it doesn’t show if the subscriber is, for example, asking only for articles (e.g. via this feed); I’m coming up with a huge list of things I’d like to do at IndieWebCamp London! But for now, this feels like a nice simple improvement to a plugin I love that helps it to fit my specific needs.

Writing A Calendar App In Rails Vs. PHP

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Some time ago, I wrote a web-based calendar application in PHP, one of my favourite programming languages. This tool would produce a HTML tabular calendar for a four week period, Monday to Sunday, in which the current date (or a user-specified date) fell in the second week (so you’re looking at this week, last week, and two weeks in the future). The user-specified date, for various reasons, would be provided as the number of seconds since the epoch (1970). In addition, the user must be able to flick forwards and backwards through the calendar, “shifting” by one or four weeks each time.

Part of this algorithm, of course, was responsible for finding the timestamp (seconds since the epoch) of the beginning of “a week last Monday”, GMT. It went something like this (pseudocode):

1. Get a handle on the beginning of "today" with [specified time] modulus [number of seconds in day]
2. Go back in time a week by deducting [number of seconds in day] multiplied by [number of days in week] (you can see I'm a real programmer, because I set "number of days in week" as a constant, in case it ever gets changed)
3. Find the previous Monday by determining what day of the week this date is on (clever functions in PHP do this for me), then take [number of seconds in day] multiplied by [number of days after Monday we are] from this to get "a week last Monday"
4. Jump forwards or backwards a number of weeks specified by the user, if necessary. Easy.
5. Of course, this isn't perfect, because this "shift backwards a week and a few days" might have put us in to "last month", in which case the calendar needs to know to deduct one month and add [number of days in last month]
6. And if we just went "back in time" beyond January, we also need to deduct a year and add 11 months. Joy.

So; not the nicest bit of code in the world.

I’ve recently been learning to program in Ruby On Rails. Ruby is a comparatively young language which has become quite popular in Japan but has only had reasonable amounts of Westernised documentation for the last four years or so. I started looking into it early this year after reading an article that compared it to Python. Rails is a web application development framework that sits on top of Ruby and promises to be “quick and structured”, becoming the “best of both worlds” between web engineering in PHP (quick and sloppy) and in Java (slow and structured). Ruby is a properly object-oriented language – even your literals are objects – and Rails takes full advantage of this.

For example, here’s my interpretation in Rails of the same bit of code as above:

@week_last_monday = 7.days.ago.gmtime.monday + params[:weeks].to_i.weeks

An explanation:

  • @week_last_monday is just a variable in which I’m keeping the result of my operation.
  • 7.days might fool you. Yes, what I’m doing there is instantiating an Integer (7, actually a Fixint, but who cares), then calling the “days” function on it, which returns me an instance of Time which represents 7 days of time.
  • Calling the ago method on my Time object, which returns me another Time object, this time one which is equal to Time.now (the time right now) minus the amount of Time I already had (7 days). Basically, I now have a handle on “7 days ago”.
  • The only thing PHP had up on me here is that it’s gmdate() function had ensured I already had my date/time in GMT; here, I have to explicitly call gmtime to do the same thing.
  • And then I simply call monday on my resulting Time object to get a handle on the beginning of the previous Monday. That simple. 24 characters of fun.
  • + params[:weeks].to_i.weeks simply increments (or decrements) the Time I have by a number of weeks specified by the user (params[:weeks] gets the number of weeks specified, to_i converts it to an integer, and weeks, like days, creates a Time object from this. In Ruby, object definitions can even override operators like +, -, <, >, etc., as if they were methods (because they are), and so the author of the Time class made it simple to perform arithmetic upon times and dates.

This was the very point at which I feel in love with Ruby on Rails.

Makes You Feel Stupid

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Don’t you feel really stupid when you plan to go via somewhere on the way to somewhere else, and completely forget about it. I managed that this morning: I’d put some keys in to get cut at the hardware shop around the corner from where I live, gone and bought my lunch from Somerfield, then returned home. When I went to work, past the shop, I forgot entirely to pick up the keys, until I got about a third of the way to the office and had to turn back. D’oh!

One of Claire’s birthday presents – being delivered by post – hasn’t arrived yet, and her birthday’s on Monday. Must remember to phone the company today and find out what’s happened to it. Can’t say what it is, here, ‘cos she reads this page, too.

Keep having to give my work colleague PHP tips so that he stands a chance of writing the website of Borth Surf Club. Looking at the web site so far, I can’t help but feel that it’s not PHP tips I should be giving him, but basic design pointers! Like not putting the title of the page as “Untitled Document”, for one. Here’s a chunk of code I just lifted out of the web site:

<p align="justify">&nbsp;</p>
<p align="justify">&nbsp;</p>
<p align="justify">&nbsp;</p>
<p align="justify">&nbsp;</p>
<p align="justify">&nbsp;</p>
<p align="justify">&nbsp;</p>
<p align="justify">&nbsp;</p>

For the non-techies out there, I’ll explain what this bit of code does. It prints seven empty paragraphs. Exciting, eh?

I’ll resist strangling him with my keyboard cable on account of the fact that I believe that there is some hope for him, yet. We’ll see.

Anyway, better get some work done…