give RF a glyphs like feature to make a component out of contour

makeParts.py

from mojo.subscriber import Subscriber, registerRoboFontSubscriber


class makeParts(Subscriber):

    debug = True

    def glyphEditorWantsContextualMenuItems(self, info):
        myMenuItems = [
            ("Make Component of Contour(s)", self.markPartCallback),
        ]
        info["itemDescriptions"].extend(myMenuItems)

    def markPartCallback(self, sender):
        glyph = CurrentGlyph()
        partName = f"_part.{glyph.name}"
        skipExportGlyphs = glyph.font.lib["public.skipExportGlyphs"]
        selectedContours = glyph.selectedContours
        if selectedContours:
            glyph.font.newGlyph(partName)
            for contour in selectedContours:
                glyph.font[partName].appendContour(contour)
                glyph.removeContour(contour)
            glyph.font[partName].width = glyph.width
            glyph.appendComponent(partName)
            skipExportGlyphs.append(partName)
        glyph.font.lib["public.skipExportGlyphs"] = list(set(skipExportGlyphs))
            


if __name__ == '__main__':
    registerRoboFontSubscriber(makeParts)