April 2013 - Beginners

GLFW-b and textures...
by emacstheviking 03 Apr '13

03 Apr '13

Seems there is no texture support, I tried this code on faith: GLFW.loadTexture2D "eric.tga" and no dice... looked closer and it really looks like GLFW-b doesn't support it, which I am sure i read somewhere. How *easy* would it be to add it... I have played with FFI, tried to do a wrapper around the Wii libwiimote library but gave up after managing to open and close a handle. I better start reading the source I guess, I am sure it won't be that hard to follow the pattern... Thanks, Sean.

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lazy mapM
by Ovidiu D 03 Apr '13

03 Apr '13

Hi again, Given the following code: g :: IO String -> IO String f :: [IO String] -> IO [ String ] f = mapM g The implementation of f is wrong because I would like to: 1. Make f behave lazy Its input list is made of lines read from stdin and I want it to process lines one by one as they are entered by the user. 2. Implement f such that it stops consuming items from the input list when the input item meets some condition. For example: isExit item = ("exit" == item) I tried to implement my own custom iteration by recursion but I got stuck in the combination of IO and list monads. Any help is appreciated. Thanks!

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[IO String] to IO [String]
by Ovidiu D 01 Apr '13

01 Apr '13

I have the function f which reads lines form the stdin and looks like this: f :: [IO String] f = getLine : f What I don't like is the fact that the line processing I'm doing will have to be in the IO Monad I would like to make this function to have the signature f : IO [String] ...such that I can get rid of the IO monad and pass the pure string list to the processing function. Can I do this? Thanks

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