Replace/remove features

Bendy · May 11, 2018, 2:06pm

Hello

In my current Thai font I want slightly different behaviour in different instances. The bold weight needs a manual adjustment in the mark feature, so I have:

# Automatic Code End

pos [roRua-thai] [saraI-thai saraIi-thai saraUe-thai saraUee-thai]' <40 0 40 0>;

But I don’t want any adjustment in the other instances. If I use a custom parameter to remove the ‘mark’ feature in those instances, then it’s not just the manual part that gets removed, but the entire mark feature. If instead I try add the manual lookup by using ‘replace feature’, it replaces the entire mark feature with only the manual lookup. It seems we need the function to ‘append to feature’ or something?

GeorgSeifert · May 12, 2018, 7:13am

Good idea.

jkutilek · May 15, 2018, 12:38pm

I made a script for a similar case which will add feature code stored in user data to the autogenerated features.

github.com

jenskutilek/Glyphs-Scripts/blob/master/Layout Features/Update OT Features.py

# MenuTitle: Update OT Features With Extra Code
# coding: utf-8

__doc__="""
Reads additional OpenType layout feature code from the glyphs’ userdata and appends it to automatically generated features.
"""

# Set user data like this:
# Font.glyphs["j_acutecomb"].userData[userdata_key] = {"locl": "script latn;\nlanguage NLD;\nsub iacute j' by j_acutecomb; # Dutch jacute"}
# Font.glyphs["J_acutecomb"].userData[userdata_key] = {"locl": "script latn;\nlanguage NLD;\nsub Iacute J' by J_acutecomb; # Dutch Jacute"}

userdata_key = "de.kutilek.otlfc"

keywords = ["sub", "pos", "by"]

def cleanup_code(code):
	# Remove comments and reformat lines to end with ;
	long = ""
	lines = code.splitlines()
	for line in lines:

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It only supports GSUB, not GPOS at the moment.