Simple feature code to replace two letters with another two letters

Glyphs
1

I want to replace er with er.ss01 is there a feature I can write this into so it’s done by default? Sorry for a silly question its been a while, or do I need to create a ligature? I would rather it not be a ligature cus I might want that also.

inter
inter1134×1134 64.6 KB

The top “er” replaced with the bottom “er”

Cheers

2

You can do it in two steps. Wrap the first step in a lookup to apply that change first.

lookup firstLetter{
	sub e' r by e.ss01;
} firstLetter;

sub e.ss01 r' by r.ss01;

Note that it turns both e r and e.ss01 r into e.ss01 r.ss01. You can also sub second letter first, which can be better sometimes, depending on how else those letters are used.

3

Thanks for that, so I put that in a calt feature. Will that make it happen by default or does the user have to click something?

Sorry for the dumb questions.

Cheers
Si

4

It depends on the app, but afaik calt is a good choice since it’s on by default in most cases.