Things I did this easter: go to church, drink, THROW SNOWBALLS.
Just a quick drop: if you use paredit.el for editing in your Lisp buffers (as you should), and you happen to also use CUA-mode (which rocks, btw), you probably know that by default they don’t play together too well. Well, I’ve finally got fed up with that and wrote some glue to fix them up. Details and code can be had from this c.l.l post
Update: For some reason WP disabled comments when I first posted this. Fixed now.
There’s a thread on c.l.l going, in which people try to find a reason macros haven’t caught on for the past 30 years, despite their immense usefulness. One of the cited arguments was this statement by one of the men in charge of Java process:
The advantages of Java is that it easily serves as a lingua franca - everyone can read a Java program and understand what is going on. User defined macros destroy that property. Every installation or project can (and will) define its own set of macros, that make their programs unreadable for everyone else. Programming languages are cultural artifacts, and their success (i.e., widespread adoption) is critically dependent on cultural factors as well as technical ones.
My claim is that this is about as true as C++’s approach to performance, in which people copy things all the time, because that’s what manual memory management makes them do. Just consider the “design patterns” omnipresent in Java. What is a macro, if not a structured transformation of source, following certain pattern? Of course, I’m saying nothing new here, but I just stumbled upon a particularly good demonstration of why “macros decrease legibility of code” is utter nonsense. Consider this snippet:
(restart-bind ((retry (lambda () (throw 'retry nil)) :report-function (lambda (stream) (write "Retry reading the record." :stream stream)))) (catch 'ok (loop do (catch 'retry (throw 'ok (unless (read-record) (error "Record not available.")))))))
Just try analysing it, how fast can you find out what exactly it does? Aren’t braided catch/throws fun? Now consider the same snippet using a macro:
(with-retry (:report "Retry reading the record.") (unless (read-record) (error "Record not available.")))
Not only is the code 4x shorter and uses idiomatic naming conventions and code structure, the macro also comes with a docstring and parameters to let you easily influence the working. And most importantly, you only have to understand it once. Whereas in Java every time you encounter a similar-looking snippet, you have to analyse it to see if it’s actually the same thing, or subtly different.
So, to sum up with a checklist, the macroless code is:
Now, to be fair, this is not to say that macros can’t be hard — very often they are, because you generally use macros to solve problems that would be even harder without them. You don’t deny surgeons access to endoscopy because they might not be skillfull enough to handle it — instead you make sure they are or have to find another trade. There’s no reason to treat programmers differently.
Saying “macros make code unreadable” is like saying “race bets can only be done on manure-covered floor, or else you won’t know you’re dealing with horses”.
ghrrrrrrr.Apple pisses me off.
Why? Well, in anticipation of some substantial cash surge (knock on wood), I decided to check in the local (hell yeah, in Odense there’s one) Apple store, to take a look at 12″ iBooks, because that’s exactly what I’d like to get — it’s damn small, has very long battery life, and is sexy (I’m not the only one to share this view, I think, because people with 12″ iBooks are common sight at the Uni). So, I went in, there was one on the display, small as expected, checked the price, OK, within acceptable range, seems they all ship with Tiger these days, which is also good. So the last question was, can I have SuperDrive with this one?
No. That’s only with 14″ ones.
Fuck. Of course, you can have 12″ PowerBook with SuperDrive, so it’s not a technical limitation, it’s just that Apple wants to suck every bit of cash out of you, because prices for PowerBooks are really crazy. It’s 13.500kr vs 8.200kr. And there’s no way I can afford that. But OTOH, I don’t want to get stuck without DVD burner either.
So, does anyone know a good, linux-compatible, 12″ notebook with DVD burner and long-lasting battery, x86 or whatever? And yes, the 12″ bit here really does matter, when you commute to school every day by bike at least.
Lots of everything going on, due to various circumstances I wasn’t able to post in the last week, so the amount of what should be written is rather large. Part of the reason was that I was sick last weekend, so instead of going for the announced cottage trip and having fun, I spent it lying in bed, not-really-able to think or write consistently. After that, I no longer had a computer available, so posting was rather out of question. And now you know.
Anyway, back to the stuff, in random order:
Bought myself a pair of bike lights, to be able to bike at night and not get fines from the local police. Turned out they didn’t work. Gone back to the big store I got it from (Bilka), and they have special section split out reserved just for the customer service. You just get a number in line, wait till it’s your turn, and settle your matters quickly and painlessly. Now, I can’t really compare it to Poland, because I don’t think I ever had to complain about a faulty product, but what I like here is the acceptance of the fact that shit happens, and someone just has to handle it, and its better for the business to do the dirty work, instead of relaying it to the customer. That’s still far too uncommon in Poland, sadly. My belief in the fact it’s a system, not an isolated occurence is strengthened by me having to cancel the cottage trip (due to the abovementioned sickness) just the next day, and it went even smoother than before — I just needed to make one call, I was instantly proposed to get my money back whenever I’m good enough to visit the office. Really a zero fuss system (even though in the end the lights stopped woring after few days, and I spent more on them I’d pay for at local “everything home and workshop” store for proper lights, but the customer service is still nice).
OTOH, I must say that things here are seriously fucked up. Honestly. For example, I missed one lecture because the timetable isn’t up for it yet (thanks to busted electronic everything system, which generated hellish delays all over the place), and I couldn’t login to “blackboard” system on Tuesday (again, busted system), and that was the only place where I could learn that first lecture is on Wednesday. So I learned that, on Wednesday after coming back from school.
Further, you’d expect that all these “e-learn” gizmos we’re supposed to use, SingleSignOn system (from Oracle, no less), account automatically created for every student would mean that I’m able to use the labs computers right from the start. Well, no. Instead I need to register with every institute separately, and of course, each has its own naming policy, acceptable passwords policy, policy on whether I’m regarded to be guest or full time student (which projects on my account’s name), hell, I even need to get Windows and Unix accounts separately in one institute! (But, not in another). Oh, and Unix in form of Solaris 8 is just a joy to use (even with Gnome 2.8 installed), becaus that fucking thing has no support for XKB. Which means no hope for Polish keyboard. Which means no school paper writing. Which means angry me, grrr. Fortunately, both institutes also have Linux labs, which is a lot nicer. Even though it’s Mandrake (or Mandriva now), which in turns means every menu and settings fucked up to infinity. D’oh.
Oh, and another lecture I missed because it overlapped with another class (from the same institute, nothing fancy like classes from different institutes), and, I think I found the Denmark’s single civil officer unable to speak even a word in English. But I wonder why she was placed in Folkeregister (National Register), which by definition deals with assigning CPR (sort of Danish social security evidence) numbers to the foreigners. And everything here is so damn expensive. Coffee is 12kr at the very least (I mean, coffee at the human-run place. Vending machines strangely enough have 4 kr for coffee, strangely because they have ∞ kr for everything else). And the books I’m supposed to buy will easily amount to several thousand kr. Booo :(
Just got back from welcome party at Uni. There was rector’s speech, then a speech from one professor researching globalisation, and then there was kindof party. That’s what I call international. We got Polish, Chinese, German, American, Hungarian, Danish, Korean, French, African, Norwegian and some other nationalities I have forgotten. Afterwards we went to the bar in the city centre, and now I’m beat. G’night.
So. I wanted to get around the city and look for cheap bikes today. Instead, I got flat tyre and spent entire time I had allocated on first attempting to fix it, and then getting new one and changin it. Ghrr. Also, the laptop I’m using right now has danish keyboard, in small notebookish layout to that. And some genious invented having “Fn” key instead of Ctrl, and Ctrl slightly to the right. So I need to aim to the right when I want to hit Ctrl-Backspace, which often results in Alt-Backspace instead. Which for some reason means “delete everything” in IE (yeah, I’ll be installing FF ASAP here). So first half of this post has been already typed in 3 times. Yay for great ideas. Now I need to finish before I run out of battery juice, because I have the laptop, I have the power adaptor, but I don’t have cable to connect that adaptor to the mains :>
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