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I want to remap the keys on my keyboard. I want to do it programatically, because I will use some logic to decide what to input. For example, when a user press "A" followed by "S", I will output "λ". In other words, everytime I type a key on my keyboard, I want to intercept it, apply some logic to it and give it back changed before it goes to the focused app.
How?
I think your keyboard has been modified and is non-standard. If for some reason you want what is printed on the keys to match up with what is typed, you could make a custom keyboard layout using
The easy way to do this would be to use Keyboard Maestro and just create two macros, one for 'q' which inserts '`' and one for '`' which inserts 'q'
It also does a ton of other awesome stuff and is one of my favorite OS X utilities, but it’s not free (there's a free trial 30 days it’s ~ $35 IIRC).
However, my guess is that you could also do it using KeyRemap4MacBook using the private.xml feature under "Misc & Uninstall"
I am not qualified to explain what needs to be in the private.xml file, however, I can point you to the documentation for A simple example of private.xml which shows some examples and explains the format of the file.
There is also a free Mac OS X app Key Codes which you will probably want to use to help you find the correct key code values.
Best Answer
Have you looked into Keyboard Maestro? I use it all the time, I believe you can accomplish with what you want using Keyboard Maestro.
For example: You can have it check for a typed in string "good" and return morning or afternoon based on the time of day.
With Keyboard Maestro you can execute AppleScript or Shell scripts. Keyboard Maestro is pretty powerful. Your macros can then be global or specific to an application.