Adds hints for the current node selection in Glyphs.app

Add Hints.py

#MenuTitle: Add Hints
# -*- coding: utf-8 -*-
"""Add Hints for the Selected Nodes. Tries to guess whether it should be H or V. If exactly one node inside a zone is selected, it will add a Ghost Hint."""

import GlyphsApp

Font = Glyphs.font
FontMaster = Font.selectedFontMaster
thisLayer = Font.selectedLayers[0]
thisSelection = [ n for n in thisLayer.selection() if n.className() == "GSNode" ]
numberOfSelectedNodes = len( thisSelection )

def hintTypeForYInTopZone( yValue ):
	for thisZone in FontMaster.alignmentZones:
		zonePosition = thisZone.position
		zoneSize = thisZone.size 
		if yValue == sorted([zonePosition, zonePosition + zoneSize, yValue])[1]:
			if zoneSize > 0:
				return -1
			elif zoneSize < 0:
				return 1
	return False

if numberOfSelectedNodes == 1:
	# Ghost Hint
	thisNode = thisSelection[0]
	thisNodePosition = thisNode.y
	hintType = hintTypeForYInTopZone( thisNodePosition )
	if hintType is not False:
		newHint = GSHint()
		newHint.originNode = thisNode
		newHint.type = hintType
		newHint.horizontal = True
		thisLayer.addHint_( newHint )
			
elif numberOfSelectedNodes % 2 == 0:
	# Determine horizontal/vertical hints:
	xCoordinates = sorted( [n.x for n in thisSelection] )
	yCoordinates = sorted( [n.y for n in thisSelection] )
	xDiff = xCoordinates[-1] - xCoordinates[0]
	yDiff = yCoordinates[-1] - yCoordinates[0]
	isHorizontal = yDiff > xDiff
	if isHorizontal:
		sortedListOfNodes = sorted( thisSelection, key=lambda n: n.y )
	else:
		sortedListOfNodes = sorted( thisSelection, key=lambda n: n.x )
	
	# Add Hints:
	for i in range( numberOfSelectedNodes // 2 ):
		firstIndex = ( i + 1 ) * 2 - 2
		secondIndex = ( i + 1 ) * 2 - 1
		firstNode = sortedListOfNodes[ firstIndex ]
		secondNode = sortedListOfNodes[ secondIndex ]
		
		newHint = GSHint()
		newHint.originNode = firstNode
		newHint.targetNode = secondNode
		newHint.type = 0
		newHint.horizontal = isHorizontal
		thisLayer.addHint_( newHint )
else:
	print "Error: Either 1 node, or an even number of nodes must be selected."

Oops, I misspelled the function, but it still works. :-)
Should be hintTypeForY() instead of hintTypeForYInTopZone().