RobFont: sync appearance states for all open sources.

syncLayerAppearance.py

# coding: utf-8
# menuTitle : 📌 Sync Layer Appearance

"""

    RoboFont layer's drawing states
    are sometimes a bit fiddly to edit. 

    Different colors, different fills. 
    
    When your designspace has many sources
    switching between different states can 
    be visually jarring. 
    
    This here script takes the current font
    as a model, and then applies its layer
    states and layer colors to the other
    open sources,
    
    I suppose it could be a small UI.
    I suppose it could text prefs.
    But not today.
    
    erik@letterror.com
    20250228

"""

# Undocumented but easy to find in the layer's lib
# I think the author wanted us to understand these keys.
layerKeys = [
    'com.typemytype.robofont.layerShow',
    'com.typemytype.robofont.layerShowCoordinates',
    'com.typemytype.robofont.layerShowFill',
    'com.typemytype.robofont.layerShowPoints',
    'com.typemytype.robofont.layerShowStroke'
]

# take the currentfont as model for the appearance of the others.
model = CurrentFont()

for f in AllFonts():
    if model.path == f.path:
        continue
    for l in f.layers:
        # model has this layer?
        if not l.name in [m.name for m in model.layers]:
            continue
        modelLayer = model.getLayer(l.name)
        l.color = modelLayer.color
        print(f"{f.info.styleName}\n.\t.\t{l.name}")
        for k in layerKeys:
            if k in l.lib and k in modelLayer.lib:
                l.lib[k] = modelLayer.lib[k]
            print(f".\t.\t.\t{k.split(".")[-1]}: {l.lib[k]}")
            #print(f"\t\t{l.color}")
        l.changed()
    f.changed()