Autoligatures in OpenType

[jolly]

How do I make sure that if you type two identical consecutive characters, such as "AA", the OpenType font taken "a" from lowercase and another "A" from uppercase?
I wish that if you type "aa", the result was "Aa", or "aA".
The font I need to lettering comics.
How to produce this result by creating an OpenType font? with auto-ligatures? 

Sorry my English but I used an automatic translator. 

[mekkablue]

This is what the calt feature (contextual alternates) is for:

Code:

@lowercase = [a b c d e f ... x y z];
@uppercase = [A B C D E F ... X Y Z];

feature calt {
  sub @uppercase @uppercase' by @lowercase;
} calt;

Hope this helps

[jolly]

I have found this video tutorial...

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