Blog Archive — Page 5

This is part of my blog, which I have long since stopped maintaining. The page has been preserved in case its content is of any interest. Please go back to the homepage to see the current contents of this site.

  • Preparing to Leave Heroku

    An email today announced a beta test of some new features that Heroku are “excited” to introduce. New service levels are available that include a “hobby” tier that does… exactly what the old “free” tier used to do. For $7 per month per app!

    The free tier has now been downgraded so that it must “sleep” — i.e. be unavailable — for at least six hours a day.

    As a long-term abuser of Heroku’s free tier, I’ve enjoyed continuous uptime for all my sites courtesy of Heroku. A lot of sites.

    Heroku Apps

    All of which I now have to slowly migrate off Heroku as freeloaders like me are no longer welcome!

    The sites that are static HTML (including the Octopress sites) and PHP have in the main already been migrated back to my own web server over the last few hours, and I’ll continue to monitor usage statistics over the next few days to ensure it can cope with the extra load.

    Some sites using Ruby, and others that depend on HTTPS will be a little more difficult to move. Certain sites such as the SuccessWhale API that require high bandwidth and good uptime may stay on Heroku and move up to a paid tier if required.

    Hopefully none of this should impact users of the sites, but please let me know if you find a site or application is inaccessible or suffering from poor performance.

  • "Archive by Year" Aside for Octopress

    (Note: This code is designed for Octopress 2. My website now uses Octopress 3— the Jekyll plugin works just the same, but Octopress 3 sites can use the jekyll-archives gem to generate proper archive-by-year pages so should not need the bookmark ‘hack’ shown in the first code block.)

    One thing that’s annoyed me since migrating my website from Wordpress to Octopress years ago has been the lack of an “archive by year” widget for the sidebar. The Wordpress widget that fulfills this function lists each month and year, with the number of posts in that month, and each one is a link to a page that shows all the posts from that month.

    As you may notice on the left-hand side of each page, I decided to recreate something similar in Octopress.

    There are a couple of differences between the WordPress implementation and my Octopress implementation:

    1. Octopress doesn’t generate pages that show all posts from a particular month (or year). It does generate an “archive” page with links to all posts in order, which is what I’ve used as a destination for each link.
    2. Partly as a result of this (and partly because I’ve been blogging far too long), I decided to stick with one link per year rather than one link per month.

    My first modification was to the “archives” page. To this I simply added a named a tag to each year title (see line 12 below). This allows each year title to be used as a bookmark and linked to appropriately.


    layout: page
    title: Blog Archive
    footer: false
    <div id="blog-archives">
    {% for post in site.posts reverse %}
    {% capture this_year %}{{ | date: "%Y" }}{% endcapture %}
    {% unless year == this_year %}
      {% assign year = this_year %}
      <h2><a name="{{ year }}"></a>{{ year }}</h2>
    {% endunless %}
      {% include archive_post.html %}
    {% endfor %}

    The code that generates the widget (or “aside”, in Octopress parlance) can’t be written in a single .html file using Liquid tags as it is too complex. Thus I implemented it by defining a new Liquid tag called archive, as follows.


    module Jekyll
      class ArchiveTag < Liquid::Tag
        def render(context)
          html = ""
          yearData =
          # Get range of years for which there are posts
          posts = context.registers[:site].posts
          firstYear = posts[0].date.year
          lastYear = posts[posts.size-1].date.year
          # Build up a map of {year => number of posts that year}
          for year in firstYear..lastYear
            yearData[year] ={ |post| == year }.size
          # Build the html items
          yearData.sort.reverse_each { |year, numPosts|
            if numPosts > 0
              html << "<li class='post'><a href='/blog/archives##{year}'>#{year} (#{numPosts})</a></li>"
          # Write out the html
    Liquid::Template.register_tag('archive', Jekyll::ArchiveTag)

    The final piece of the puzzle is to create an aside to display the new tag, which is done simply as follows:


      <ul id="archive">
        {% archive %}

    Adding asides/archive.html to the default_asides section in Octopress’ _config.yml adds the new aside to each page.

    The end result is just like the one you can see in the sidebar of every page on this blog: a list of each year for which there are posts, in descending order, suffixed by the number of posts made that year. Each item in the list is a link to the main “archive” page, jumping straight to the bookmark for that year.

    This code is in the public domain so feel free to use it on your own blog and modify it however you like!

  • Another Decade Older

    Time flies when you’re having fun. And somehow, without really realising it, I turned thirty years old.

    I’d say I’ve come far from where I began — but though I’ve been a way, I came back, and now I’m not so very far away after all. I live in the same town; have the same comfortable life; have a son who for all the world looked at age one just like I did.

    Me, age zero

    I might have longer hair and smaller glasses, but the “me” I remember from age 10 is not so different to me now — we like computer games and robots and long walks on frosty winter afternoons, and I ended up with the career I always knew I’d have.

    Me, age ten

    And me at age 20, I remember him vividly. We still have the same friends, the same memories; we like the same films and most of the same music; we live for the light of the summer and the laughter of our friends.

    Me, age twenty

    And now I turn 30, surrounded by those same friends who have been with me so long, and the family who have been there even longer. I have a family of my own, and the cycle begins again.

    I have a wife and a son, a home and a job; a family and a life just like those back where I began.

    Me, age thirty

    My parents told me a story once; how they had a plant they couldn’t identify growing in a pot on the front porch. One day, at last, it bloomed into flower — it was a lilac. My father brought the flower to my mother, who was in hospital about to have a child.

    It was the beginning of May, of the year 1985.

    Every year since, I’ve known that Spring was on its way by the pink and white blossom of the lilac trees. Thirty years I have counted this way, and many more I’ll count in years to come.

    For the rest of my life and thousands more once I am gone, lilacs will be special to me and to countless others, as they announce the start of the year’s long warm days; the days we lived for, the light of the summer and the laughter of our friends.

  • A Case of Stolen Identity

    London is a strange place.

    Not the places the tourists see — the shopping streets, the palaces, the museums. Those I understand. What’s strange to me is the rest of it; the places where people live and work. The estates of a thousand homes, red-brick and identical and unaffordable, each one hiding its own stories and secrets behind its unremarkable façade. The big houses split into dozens of tiny apartments, crammed in between the gas works and the scrap metal yards. The million-dollar cookie-cutter canal-side apartments, and the dirty bedsits under the railway bridges.

    Wood Green, London by David Holt, CC by-sa

    What gets me is the sheer scale of it all. You can drive for hours and never leave the city. Everything is there, you could live your whole life there — walking in St James’s Park and thinking it’s the country; sitting on the sand at Southwark and thinking it’s the seaside; gazing out at the Thames estuary as if it were the sea.

    Beach at Southwark by Christine Matthews via Wikimedia Commons, CC by-sa

    My own town is only a couple of miles wide, with a population just under 200,000. It’s too big for me — one day, perhaps, I’ll get that slate-roofed cottage in a little village by the sea — but it’s a place I feel comfortable, a place where I have an identity. Perhaps it’s the upper bound on the size of place that I can consider without feeling crushed by it all.

    I’m pretty sure I wouldn’t survive living in London. It astounds me that others manage it; to get through each day in the knowledge that you’re one of 20 million people living in one of a million homes; catching the rickety tube train home at night to a suburb and a street indistinguishable from the rest.

    And London I’m sure is not the worst offender. Take this famous photo of Barcelona from the air, block after block of apartments and shops and offices and millions on millions of people stretching all the way to the horizon.

    Aerial view of Barcelona

    Or worse still, this diagram superimposing the extent of the Tokyo metropolitan area over a significant portion of my entire country. It’s population is nearing 40 million.

    Size of Tokyo compared to the UK

    I have nothing but respect for the people who can survive living in such a place. I hope that I never have to, for I’m sure that a year and a day in the city would be the end of me. I’d be swallowed up by the enormity of it all, the drudgery pervading my soul, my name and my identity lost in the choking air that spirals up and out over the city.

  • The End of the Road for SuccessWhale's Facebook Support?

    My SuccessWhale application has long supported both Twitter and Facebook social networks, despite both networks’ relatively developer-hostile stances. The worst offender by far was Twitter, with it’s 100,000 user limit that has deliberately crippled many third-party clients in order to drive users to the official website and app, which make money for Twitter through adverts. While I was never under any delusion that SuccessWhale would be popular enough to reach 100,000 users, it’s not a nice thing to have hanging over your head as a developer.

    Facebook’s permissions policy, as I have ranted about before, also makes it difficult for third-party clients to deliver a useful service for their users. With the new requirement that apps migrate to API v2, they are adding the extra hassle of requiring all apps be reviewed by Facebook staff. This isn’t a problem itself — SuccessWhale has been through the somewhat scary process of manual review before when it was added to the Firefox Marketplace.

    But Facebook has now snuck something extra into the notes for some of its permissions, each of which must now be manually approved as part of the review process. Into pretty much all the permissions that are fundamental for SuccessWhale, such as read_stream:

    Facebook dialog for read_stream permission

    Yep, this permission will be denied, as a matter of policy, to apps running on Android, iOS, web, desktop, and more.

    So predictably, SuccessWhale failed its manual review and has been denied approval to use Facebook API v2.0 or above. As far as I can tell at this point, that means on May 1st all Facebook features of SuccessWhale will cease to function. Facebook, ever the proponent of the walled garden path down which Twitter has ventured as well, has struck another blow for increasing their profits and user lock-in at the expense of the open web that SuccessWhale depends on.

    It’s a sad time for the web; the “web 2.0” of mashups and free access to data is slipping away with it. And though Facebook’s change does not kill off SuccessWhale and its kin outright, the future does not look rosy for us developers that believe users should be free to access a service in a way they prefer.

  • Fun with Playbulb

    Playbulbs are colour LED lights sold by a company called Mipow. They come with an iOS and Android app that can set their colour and various patterns via Bluetooth. There’s no security on them whatsoever, so any nearby device can connect and change their colour. That seems pretty bad — especially when you consider that as well as the small “candle” style lights we have, they also sell room lighting versions that play music and can probably flash fast enough to trigger photosensitive epilepsy. Controlled by your neighbours!

    Playbulb Candle

    Despite the security problem, this does have one advantage: it’s easy to get any other device controlling the Playbulb, not just a phone with their official app. Anything with a Bluetooth 4.0 Low Energy transceiver can easily control the Playbulb using tools like those provided by BlueZ under Linux, and the protocol is somewhat understood. This means it’s pretty easy to control a Playbulb programatically using the language of your choice.

    Here’s a demonstration I knocked up this morning: mailcheck. This python script checks an IMAP mailbox at a defined interval, and will set the Playbulb colour to red if there are no unread messages, or green (with a brief flash) when you have unread mail. It was inspired by similar “ambient electronic devices” such as Nabaztag. Here it is in action:

    It’s BSD-licenced open source, so if you have a Playbulb you want to have some fun with, please take my code and use it for your own ends!

  • IKEA Navigational Cheats

    It was suggested on IRC last night that the sad, cautionary tale of Sultan Hamnvik may have its roots in my simple lack of knowledge — particularly of the “cheats” that allow for easier navigation around IKEA’s torturous, non-Euclidean shop floors.

    I’d like to take this opportunity to refute that claim by presenting a set of simple IKEA navigational cheats that I feel will help newcomers avoid the Sultan’s fate.

    1. Set off the Fire Alarm

    Amid thousands of fleeing people, not only does the fire escape become an exit route that can be used without arousing suspicion, but the Dread Guardians of the Store will be forced to flee also. This gives you the perfect opportunity to make your escape and flee into the night, never to return.

    Break glass with IKEA for Mice™ sledgehammer.

    2. Disassemble Partition Walls

    IKEA is known for forcing its victims on a torturous journey around what, once upon a time, would have been an open space. Luckily, this can be rectified. A number of tools are available for purchase in IKEA, such as screwdrivers, hammers and drills. Use these to disassemble partition walls to open up a more direct route to the exit.

    If you have one, wear a high-vis jacket for this cheat. No-one questions why you’re removing a wall if you’re wearing a high-vis jacket.

    Beyond the wall lies freedom from tyranny.

    3. Man the Barricades

    Flat-pack products can, with some difficulty, be turned into functioning beds and tables. With a little more effort they can also be built into functioning barricades, which you can deploy at key points in the store and refuse to leave until the CEO of IKEA is sent to the guillotine. Without its head, the Beast Known as IKEA will slowly disintegrate into dust.

    This method will earn you 1240 exp and 300 gold.

    And a role in a prominent West End musical.

    4. A Class at Miskatonic University

    For those who have knowledge of such dark and insidious things as the workings of IKEA, the subtle geometry of their stores can be exploited. Seek refuge in shadow, blend in and slip through darkened corners into worlds of eternal night, emerging at will in other places and other times. Hopefully ones well away from IKEA. Beware the Yellow Sign.


    5. Flat is Easy

    Navigating the store becomes easy when it is reduced to rubble by a period of sustained naval bombardment. Shelter in the basement until the explosions stop, then emerge to discover a brighter, IKEA-free world.

    Croydon IKEA (before bombardment)

    6. Through the Wardrobe

    Head to the bedroom section and seek out a pine-effect wardrobe called “NÄRNIJÄ”. Enter it to find yourself in a snow-bound fantasy land. You will be harassed by the minions of the White Witch, but I think we can all agree that this is safer and more enjoyable than the average visit to IKEA.

    Defeat the witch to emerge in your grandparents’ attic in the year 1942, conveniently giving you the opportunity to stop IKEA from being created in the first place.

    The IKEA board of directors meets for the Monday morning leadership briefing.

    7. The Only Way to be Sure

    Nuke it from orbit. It is, as they say, the only way to be sure.

    Some collateral damage to local populations is to be expected, but I think you’ll agree this is a small price to pay to rid the land of the monstrous beast that is IKEA.

    All those poor meatballs. Rest in peace, mixed with delicious iodine-131 sauce.

    8. An Alternative Approach

    Don’t go to IKEA.

  • All-Terrain Raspberry Pi!

    Another year, another childrens’ toy with a Raspberry Pi needlessly attached to it.

    Over the past few weeks, I’ve been taking one of my son’s old broken RC toys and turning it into something a bit more fun — by strapping a computer to it, naturally.

    The result is the “All-Terrain Pi”, a robot which can be controlled by smartphone as if it were a racing game, or by using the kid-friendly Scratch programming language.

    Here’s a video of the smartphone interface. It all runs in the web browser, with no need to install an app on the phone. Full-screen (ish) video streams from the robot’s on-board camera, while speed and turning are controlled using touch and tilt controls implemented in Javascript.

    Programming in Scratch is possible too, recreating the 80s/90s Logo “Turtle” experience for a new generation. As with the smartphone interface there’s a Python program behind the scenes controlling the motor driver board, but this time it receives commands via Scratch’s “Remote Sensors Protocol”.

    It didn’t take long for my son to get into controlling the robot, both with the game-like smartphone interface and using Scratch, which he has some experience with from school. (They start programming young now!) We took it to last weekend’s Constructorium hackerspace event at the library, where it was a big hit — by the end of the afternoon, he was teaching the grown-ups!

    Programming the All-Terrain Pi in Scratch

    “Proud” is an understatement.

    I’ve finished all the things I set out to achieve with this robot, in a total of only 20 hours or so. Thanks to a pre-made motor driver board and a Raspberry Pi camera fork of mjpg-streamer, some of the hardest bits of the project turned out to be very easy, so I’m very grateful to everyone whose work I’ve built upon to create this robot.

    I’m hoping we might be allowed to take the robot into school and maybe hold a competition for the kids to write a program to steer it around an obstacle course; or something similar — to make programming more exciting by taking it off the computer screen and into the real world. If the teachers don’t let us do that, we might hook it up to the internet and have it controlled using redstone circuits on my son’s Minecraft server.

    You can find a step-by-step guide to how I built the robot on the All-Terrain Pi page and all the code is open source!

  • Fun with Parental Controls

    Now that our son is getting older, it’s inevitable that his computer use is no longer closely scrutinised — we no longer need to be hanging over his shoulder, showing him what to click on.

    Although his web browsing habits run only as far as Planet Minecraft and whatever flash game they’re currently peddling on the Disney Channel, the convenience of App Stores means that he has thousands of poorly-made and wholly inappropriate games available at the click of a mouse. It’s time for something I hoped we wouldn’t have to use — parental controls.

    I think we have a five-year window at most between enabling them and him discovering proxies, live CD operating systems or that the administrator password is an easily brute-forceable dictionary word.

    But even now, they’re a long way from being useful. We initially decided that “12+” was a reasonable setting for the level of control, since Microsoft already considers most of the games he plays to be rated 12. But the user-supplied ratings of games in the App Store make it all kind of pointless. Here’s MSN Sport, rated 16+ in case it contains some truly horrible material, like American Football.

    MSN Sport, rated 16+

    And the much more wholesome Zombie Sniper 3D (“Beautiful 3D visuals!”), rated 12+.

    Zombie Sniper 3D, rated 12+

    I suppose that no matter how hard the providers try, parental controls never will be a substitute for being there, checking things out; actual parenting.

  • Another Year Gone By

    Lights flicker and fade, drawing the year to a close. Outside, the weather is warming and slowly burning the frost away; a tiny ripple before the wave of heat to come, before it is summer again.

    2014 has been a year of travel, with three trips abroad setting a new record for the furthest south and east I’ve travelled across the world — records I hope to beat before too many more years pass.

    Madha wadi

    Madha wadi, UAE-Oman border

    This year also contained what felt like at least 24 months stuck in the office writing documentation and trying to get sales people to stop changing the system design every five minutes.

    But for all that, the year has really been about friends and family. August was spent between Galicia and Yorkshire, with those branches of the family we don’t often see.

    Family in Galicia

    Family in Galicia

    It was the year of RABIES 10, an annual party we started at university that, against all logic and reason, is still going after so many years. It still grows steadily year on year, from the 20-person sit-down dinner of 2005 to what’s now a barbecue with a head count of over 50. This was Joseph’s first year in attendance — he brought along a card game and out-geeked the geeks.

    Playing Fluxx at RABIES 10

    Playing Fluxx at RABIES 10

    It was the year of my twenty-ninth birthday, the last before the looming milestone of thirty. I still can’t drive a car, but I am married, I have a child, a good job and plenty of friends, and when I think of all that, thirty doesn’t seem so scary.

    Joseph's birthday cake

    And it was Joseph’s seventh birthday too.

    As December dawned and winter descended, we were surrounded by our family and friends once again — just as always, and I wouldn’t have it any other way.

    Christmas with Friends

    Christmas with Friends

    Christmas with Family

    Christmas with Family

    So tonight, I raise a glass — to family and friends, near and far. To all of you.

    Happy new year.