Back from San Francisco

Back from San Francisco, after spending a week there for the Google Summer of Code Summit. I'll write more about that in the next few days. Getting back, and I notice that it's really feeling like summer in Sydney now: it's 30-odd degrees, and our cactus is flowering for the first time. Nina Cat thinks its good weather for sleeping, as usual.

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Tshirt

And of course, the real reason we all participated in the Google Summer of Code: the tshirts! Mine finally arrived, the day after I get back from the GSoC summit, oh well :)

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Roll your own network code in Haskell

This week a medium length tutorial on network programming in Haskell. We build a concise IRC bot, and toss some custom control structures and a monad into the mixture. A small taste:

-- The 'Net' monad, a wrapper over IO, carrying the bot's immutable state.
type Net = ReaderT Bot IO
data Bot = Bot { socket :: Handle }

-- Set up actions to run on start and end, and run the main loop
main :: IO ()
main = bracket connect disconnect loop

listen :: Handle -> Net ()
listen h = forever $ do
    s <- io (hGetLine h)
    io (putStrLn s)
    when (ping s) $ pong s

Read the tutorial.

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Real World Haskell

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Recommended

• Working at a high altitude for low level performance
• Write Haskell as fast as C: exploiting strictness, laziness and recursion
• Haskell is a strict language
• Use those extra cores and beat C today!
• No monadic headaches: multi-core concurrency is easy in Haskell
• No more exceptions: debugging Haskell code with GHCi
• Run length encoding in Haskell
• xmonad: a success for pure functional data and QuickCheck
• Tracking focus with a Zipper
• Roll your own window manager
• The programmable semicolon: shell scripting and privilege separation
• Programming Haskell: argument handling
• Programming Haskell: string processing and concurrency
• Programming Haskell: introduction
• Roll your own IRC bot
• Simple unix tools

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