Writing an UFO with ufoLib

[jenskutilek]

I don’t get exactly how to write an UFO with ufoLib.

path = pathlib.Path("whatever.ufo")
writer = UFOWriter(path)
# Add the glyph set
glyphs_path = path / "glyphs"
glyphs_path.mkdir()
gs = GlyphSet(glyphs_path)
# Add a glyph
g = Glyph("myGlyph", gs)
gs.writeGlyph("myGlyph", g)
gs.writeContents()

So far, so good, but how do I write the layer info? I'm trying this:

gs.writeLayerInfo(["public.default", "glyphs"])
writer.writeLayerContents()
writer.close()

This way I end up with an empty layercontents.plist:

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <array/>
</plist>

... and the resulting UFO is invalid when trying to open it in RoboFont.

If I try to pass something to writer.writeLayerContents:

gs.writeLayerInfo(["public.default", "glyphs"])
writer.writeLayerContents(["public.default", "glyphs"])

... it complains that

fontTools.ufoLib.errors.UFOLibError: The layer order content does not match the glyph sets that have been created.

The docs don't say anything about what the layerOrder argument to writeLayerContents should contain.

[justvanrossum]

I think you need to use writer.getGlyphSet()

[jenskutilek]

That's it, thank you!