Avoid off-curve start points in UFO files

redraw_for_start_point.py

'''
Avoid offcurve start points
'''

from fontTools.ufoLib.pointPen import PointToSegmentPen


def find_offcurve_start(glyph):
    '''
    compare coordinates of first bPoint to coordinates of first point
    return True (offcurve start) if they differ
    '''
    for contour in g.contours:
        first_point = contour.points[0]
        first_bPoint = contour.bPoints[0]
        first_point_coords = (first_point.x, first_point.y)
        if first_point_coords != first_bPoint.anchor:
            return True
    return False


def redraw_glyph(g):
    contours = []

    for contour in g.contours:
        points = [p for p in contour.points]
        while points[0].type == 'offcurve':
            points.append(points.pop(0))
        contours.append(points)

    g.prepareUndo('redraw')
    rg = RGlyph()
    ppen = PointToSegmentPen(rg.getPen())

    for contour in contours:
        ppen.beginPath()
        for point in contour:
            if point.type == 'offcurve':
                ptype = None
            else:
                ptype = point.type
            ppen.addPoint((point.x, point.y), ptype)
        ppen.endPath()

    g.clearContours()
    g.appendGlyph(rg)
    g.performUndo()
    g.changed()



a = AllFonts()
glyphs_with_offcurve_start = []

for f in a:
    glyphs_with_contours = [g for g in f if len(g.contours)]

    for g in glyphs_with_contours:
        if find_offcurve_start(g):
            glyphs_with_offcurve_start.append(g)

for g in glyphs_with_offcurve_start:
    print(g.name)
    print(g.contours[0].points[0].type, end=' ')
    redraw_glyph(g)
    print()

Thanks, @frankrolf !