How to tell whether glyph has kerning exception

Scripting
1

Hello, I am trying to find the following in the API doc:

I want to set the kerning for a pair with group exceptions. I can tell Glyphs to kern by glyph name or by kerning key – but I cannot automatically recognise whether a glyph is set to kerning exception or not. Glyphs will still kern with the kerning key, not with the glyph, although it is set to exception.

Any ideas? Thank you!

2

Having an exception means that the glyphs has glyph and class kerning. There is a method in the GSLayer that can help: GSLayer Class Reference

3

Hello. I can’t figure out how this works in Python.

print(Font.glyphs["o"].layers[0].previousKerningExeptionForLayer(Font.glyphs["d"].layers[0]))

This returns AttributeError: 'NSKVONotifying_GSLayer' object has no attribute 'previousKerningExeptionForLayer'

Is this at least somewhat correct, or am I completely on the wrong path?

4

The method is called previousKerningExeptionForLayer:direction:. In Python, the colons need to be replaced by an underscore:

o = Font.glyphs["o"].layers[0]
d = Font.glyphs["d"].layers[0]
kern = o.previousKerningExeptionForLayer_direction_(d, LTR)
print(kern)
1 Like
5

Thank you very very much!

Just a side note, the method has a typo. It needs to be Exception, not Exeption.

6

Typos are generally kept for backwards compatibility with existing scripts and plugins. We might add a version without the typo and keep the current method but hide it from the docs.