Duplicate Glyph with Component.py

#MenuTitle: Duplicate Glyph with Component
# -*- coding: utf-8 -*-
from __future__ import print_function, division, unicode_literals
__doc__ = """
Duplicates selected glyphs but as components, giving them 001 suffix or above depending on availability.
"""

from GlyphsApp import Glyphs, GSGlyph, GSComponent

f = Glyphs.font

# returns the base glyph name without ".00X" suffix.
# I'm doing it just in case the selected glyph already has such suffix.


def removeSuffix(glyphName):
	try:
		if glyphName[-4] == "." and glyphName[-3:].isdigit:
			return glyphName[:-4]
		else:
			return glyphName
	except:  # glyph name too short, passes the test without removal
		return glyphName

# returns the smallest available suffix number. Tries up to .100


def findSuffix(glyphName):
	glyphName = removeSuffix(glyphName)
	if glyphName is not None:
		for i in range(1, 100):
			suffix = ".%03d" % i
			# if glyph name available, stop loop early
			if f.glyphs[glyphName + suffix] is None:
				break
		return suffix
	else:
		return None


newGlyphs = []
# make set first before iteration to avoid running multiple times
# on the same glyph (that can happen if ran from Edit View)
for l in set(f.selectedLayers):
	originGlyph = l.parent

	# prepare new glyph name
	newGlyphNameBase = removeSuffix(originGlyph.name)
	newSuffix = findSuffix(newGlyphNameBase)
	if newSuffix is not None:
		newGlyphName = newGlyphNameBase + newSuffix

		# add new glyph
		newGlyph = GSGlyph(newGlyphName)
		f.glyphs.append(newGlyph)

		# newGlyph is currently empty.
		# Place component to all layers in it.
		for m in f.masters:
			c = GSComponent(originGlyph.name)
			c.alignment = True
			newGlyph.layers[m.id].components.append(c)
			# Setting width may be unncessary since component is auto-aligned
			newGlyph.layers[m.id].width = originGlyph.layers[m.id].width
		print("Added", newGlyphName)
		newGlyphs.append(newGlyph)

# if the script was ran from Edit view, show the added glyphs
if f.currentTab is not None:
	masterID = f.selectedFontMaster.id
	theTab = f.currentTab
	theTabLayers = list(theTab.layers)
	insertPos = theTab.textCursor + theTab.textRange
	for g in newGlyphs:
		layer = g.layers[masterID]
		theTabLayers.insert(insertPos, layer)
		insertPos += 1
	theTab.layers = theTabLayers