Pieces of code

Kevin blogs here.


    Squad takes the Joel test




    Django self code review for dummies


    After 2 years at an enterprise backup software firm, I finally took the plunge and joined a startup. I love the engineering culture we have here at Squad, and rigorous code reviews are very much a part of it. Since I often found myself repeating the same mistakes again (and again, and again..), I went ahead and wrote a check list to help me.



    Authentication with React-router 4.x


    This article is inspired by the excellent tutorial by Scott Luptowski on how to add authentication to you React app. I attempt to re-invent the wheel again because the original article cites an older version of react-router and the instructions do not work if you are using react-router 4.x. There are a lot of breaking changes when you migrate from 3.x to 4.x, and there is an answer to all the whys here



    Starting up on a saturday 'noon.


    I had a sudden itch to build something from the ground up. I knew the moment it started to itch that the itch will not be cured until I sink hours into something laborious and intellectually satisfying. I wanted to build a company from the ground up. If a stupid photo sharing app like instagram could make so much money despite bringing almost zero utility to the user, I’m pretty sure anything can make money. On hindsight I realise that I might be just another clueless programmer who can’t figure out how the hell instagram, vine, yo, and whatsapp made so much money. I mean come on, did the world really need another texting service? Or another photosharing service when there was facebook, flickr and a whole ton other services? Don’t even get me started on yo. I admit it. I’m just jealous. I know that instagram is engineered well.



    Assembled a computer


    I was without a computer for a whole year. A whole frigging year. And THIS, is my reward:



    Pomodoros for programming


    According to lifehacker, the pomodoro technique came out as the most popular productivity method. I’ve been using this neat little technique since college. And now work. Pomodoros for exam prep was easy - you sit in front of the book while the clock is ticking and you go for a walk when it isn’t. But using pomodoros for programming turned out to be slightly more complicated than that. Here’s what I found:



    Web design for programmers : A 10 minutes crash course


    I’m not a designer, and I’d rather not be one. However, there are times when programmers who don’t like to design (or draw, for that matter) are forced into that tedious act. I was responsible for designing the front end of a product at a company I interned at for the last 2 months.



    Cohen's clipping algorithms in javascript


    Okay this was homework. I searched for a really long time for a javascript implementation of cohen’s clipping algorithms and could find none. Professor said write it in c but its hard to program mouse clicks in c. With javascript, all it takes is a browser.



    Sound frequencies with aubio


    Small python script I wrote so that you can yell at the console and see the frequency on the screen. The results can be slightly wrong (incorrect spikes in frequency occasionally) but it was great yelling at the computer with my hostel mates to see who’s got the highest ‘range’ :D



    GSoC : Final report


    Putting together a quick report of how I spent my last 3 months on improving varnam, an awesome transliteration project. My task was to implement a stemmer to improve the learning in varnam.



    GSoC : Memory heap corruption and code rewrite


    This week I’ve been busy rewriting the stemmer and debugging some memory heap corruption. My first implmentation of the stemmer used to crash ibus whenever certain words, like “ദൂരെയാണ്” and “വിദൂരമായ” were typed. I could not locate the problem, and the only error message I got was “free() - invalid next size” when ibus crashed. Some searching revealed that it might be due to a memory heap corruption. I used valgrind memcheck to debug the memory corruption. It was difficult to make sense of valgrind’s output, and that eventually lead me to ask a question at stackoverflow.



    GSoC : Code review 1, almost.


    Before more thorough testing of the stemming algorithm and its effect on varnam’s learning, my mentor and I decided that it would be a good idea to do some code review. So this week I fixed some problems with the stemming, tested how the stemming works with ibus input method, checked if learning is improving at all, and wrote some unit tests.



    GSoC : Exceptions table and some testing


    Progress has been slow the past week, thanks to some non-academic preoccupations and a trip home. However, had I been a bit more organized, I would have been more successful at the rather mundane task of testing out the stemming accuracy.



    GSoC : Libvarnam can now stem


    Very productive ten days. Libvarnam is finally stemming the words. I might not be so wrong in stating that the project is almost half complete. I’ve come up with a multi-pass stemming algorithm (although no flow-chart drawing was required - maybe I’ll draw one for clarity later) that has the potential to stem with a reasonable accuracy. Since the algorithm is intended to serve as a platform for many Indian languages, proper documentation is quite important. As a first step, I’ve made a separate github repository putting together the thought process that went into designing the algorithm. The first draft of the algorithm is in the file “03algorithm” here. Please note that the files 01classification and 02implementation are not updated -  those are just things I jotted down.



    GSoC : Malayalam stemmer foundation


    Another week, and I’m finally working on what I signed up to do - implement a malayalam stemmer. The algorithm itself is still a haze, and I will be sitting down and drawing flowcharts soon. Despite being harassed by university practical exams, I managed to squeeze in enough time to lay down a basic framework. Varnam now has the potential to stem.



    It's black and its listening!


    I’ve been longing for this day (/night) for almost an year now! I’ve finally, finally, got some data from an electret mic and finally got it into a beaglebone black. If you really want to understand the depth of this achievement, please go through what I’ve been doing for the past few months:



    GSoC : Unit tests, Merges and Travis


    Its been two weeks since community bonding got over and I’ve been making slow but steady progress. A couple of new bugs has surfaced and I will be fixing them before moving on to my main task.



    Monochrome Demo, in linux!





    Steam rocks! Playing monochrome demo in linux mint, steam client. I move my hand to the side vent, and is that my graphics card heating up? Couldn’t be! (teary eyed and feeling grateful)



    KDE, Gnome, Unity and cinnamon - why should you care?


    You shouldn’t.



    GSoC : Community bonding


    The community bonding period of this year’s google summer of code is nearing an end. Its been a rather busy week, and I had to juggle time between exam preps and GsoC. I cannot say that I have made much progress. However, an IRC meeting with the mentor turned out to be very fruitful. It was about setting up the right development environment, and I did learn a lot!



    Google Summer of Code!


    I’m excited to announce that I’ve been selected to this year’s google summer of code. My mentoring organization is SMC - Swathantra Malayalam Computing and I will be working on the varnam project.



    Getting machines to listen


    I’ve been wanting to do this sound localization project for almost an year now. Its simple - have a few microphones ready, yell at it, and display the direction of sound on a screen. And being the electronics newbie I am, I had spent a considerable amount of time wondering how to connect an electret mic to my board/computer.



    S-tall-man the tall man


    SPACE - Society for the Promotion of Alternative Computing Environments celebrated their 10 years of existence today here at Trivandrum and they invited none other than Richard Stallman to do the talking. I was 13 or 14 years old when my father first told me about Richard Stallman and about the ‘big things’ he were doing with computers. The only impression I got from his photo was that he was a particularly huge man with huge beard and loooong hair. Today, I saw this guy ‘for real’. Mr.Stallman has had a rather warm relationship with the government of Kerala and he had visited the state several times before. After all, this guy had convinced our government to get rid of the windows PCs and move to free software. Thanks to Stallman - I’m not using that retarded Turbo c++ compiler to compile my c++ programs.



    Back with some brains!


    Its been quite some time since I posted, I admit. The good news is, I’m back. Another good news is, I found something cool!



    Coloring the canvas - the processing way


    I thought it was time somebody started painting on the canvas. Its been a couple of months since I wrote this program and it was lying in a corner of my hard disk all along. Realized kevinkoder.tk is pretty low on contents and decided to add it to the site.



    Fading menu


    Remember me ranting about that free domain name? Well I’ve put it to some good use. Here’s the link to my very first sketch to be hosted on the world wide web :



    Tokelau Beckons


    EDIT: The domain I registered was taken away. I do not know what happened. Probably because it was free and they figured out I’m never going to upgrade. kevinkoder.tk is officially down. kevinkoder.hostei.com still works, though



    Back to the Basics


    I admit that what I am about to write will not really fit in with the ‘theme’ of the blog - share code. But yet, I feel compelled to share a tiny story happening around a windows xp iso image sitting inside a pendrive.



    Into the web


    I’ve always thought that developing for the web was easy and boring - thanks to my computer teacher who taught me html in 8th grade. However, I used to feel a sense of accomplishment when I saw my marquee going across my web page - and change direction when it hits the edge. And soon enough i came to understand that real programming was a world apart from creating simple web pages in html. And I began to look down on web development as something that is less ‘glorious’ than developing desktop applications.



    Living the 'Life'!


    After a lot of tinkering and pondering over the code, I managed to connect our gui to the core of the program. I even managed to throw in some sort of control using a few buttons and a slider (which determines the size of the board). Now the program works in two modes : One which lets you input an initial configuration and computes the next state on every right click. The user can click on any cell at any time to make it alive. The other mode, dubbed the ‘continous mode’, however lets you modify the board only at the start of the program. Once the user press the right mouse button, the program keeps on displaying subsequent states continuously - which is more fun to watch - and finally settles down in a stable state.



    Green dots ahead - playing with pygame


    Now that the ‘core’ of the program is up and running (see the previous post : game of life 101) it’s time to add a little glamour to our ‘life’!



    Game of life 101


    Command line life



    Up for a game of life, anyone?


    No, I’m not talking about the board game. This particular game of life, was thought up by a (respected) guy named Conway way back in the 70s. The rules are pretty simple, and a little time with our friend Google can fish out a lot of info on the subject. But for the uninitiated and the lazy, let me elaborate:



    Ho Ho MapleBlow!


    My very first Pygame project. Its not professional and it certainly isn’t the best way to implement what I was hoping to implement. But as they say, a journey of thousand miles begins with a single step.