Insert #exit and #entry at Baseline

Insert #exit and #entry at Baseline.py

#MenuTitle: Insert #exit and #entry at Baseline
# -*- coding: utf-8 -*-
__doc__="""
Adds #exit and #entry anchors at the sidebearings on the baseline. Useful for glyphs like period that are reused in glyphs like ellipsis.
"""

def process( thisLayer ):
	for thisAnchorInfo in (("#entry",0),("#exit",1),):
		newAnchor = GSAnchor()
		newAnchor.name = thisAnchorInfo[0]
		newAnchor.position = NSPoint( thisLayer.width * thisAnchorInfo[1], 0.0 )
		thisLayer.anchors.append(newAnchor)

thisFont.disableUpdateInterface() # suppresses UI updates in Font View

thisFont = Glyphs.font # frontmost font
for thisLayer in thisFont.selectedLayers:
	thisGlyph = thisLayer.parent
	print "Processing %s" % thisGlyph.name
	thisGlyph.beginUndo() # begin undo grouping
	for thatLayer in thisGlyph.layers:
		process( thisLayer )
	thisGlyph.endUndo()   # end undo grouping

thisFont.enableUpdateInterface() # re-enables UI updates in Font View

Thanks for sharing this!

What exactly is the benefit of building an ellipsis with #exit and #entry rather than using plain Automatic Alignment?

Is it to allow for additional space between the dots? But it would not be applied to the sidebearings of the ellipsis glyph, which is not acceptable. My understanding is that typing the ellipsis several times (like this: ………) must result in a regular spacing of all dots, or at least not be tighter spaced across the glyph border.