#input "YourFont.ttf"
#output "YourFont.otf"

script latn { /* Latin */
	feature ligatures;
	/* you can add more features here */
}

script dflt { /* default */
	feature ligatures; /* no problem to use the same feature again */
}

feature ligatures liga {
	lookup ligaSub;
	/* you can add more lookups here */
}

lookup ligaSub {
	ignore mark;
	
	sub f f i -> ffi;
	sub f f   -> ff;
	sub f i   -> fi;
}