improve setting woffMetaDataDescription

[typemytype]

when setting the url field and no text is set it fails hard

see https://forum.robofont.com/topic/566/fontinfo-woff-description-url

[typemytype]

the ufoLib woffMetadataDescription validator requires both url as text keys, only one is provided while setting the url value.

maybe the validator must be less strict on requiring the text keyword, see https://github.com/anthrotype/ufoLib/blob/master/Lib/ufoLib/validators.py#L378

other woff info attributes dont require the text keyword (see fontInfoWOFFMetadataLicenseValidator) which is basically the same from data structure.

Should I open an issue on fontTools.ufoLib?

@typesupply @anthrotype

[typemytype]

the patch could be:

(replaces https://github.com/anthrotype/ufoLib/blob/master/Lib/ufoLib/validators.py#L374-L384 )

def fontInfoWOFFMetadataDescriptionValidator(value):
	"""
	Version 3+.
	"""
	dictPrototype = dict(url=(basestring, False), text=(list, False))
	if not genericDictValidator(value, dictPrototype):
		return False
	if "text" in value:
		for text in value["text"]:
			if not fontInfoWOFFMetadataTextValue(text):
				return False
	return True

I can make an fontTool PR if you like

[typemytype]

closing the issue here in as this has moved to fontTools ufoLib

fonttools/fonttools#1471

[benkiel]

Reading the WOFF spec, the url element is optional, but one or more text elements is required if setting the description element.

[typemytype]

need to refactor the woffMetaDataDescription control:

options are (the problem is you can not set multiple things at the same time, since that is galaxtically in space and time just not possible):

• add default entry when a url is given?
• only set the url when there is entry?
• the url is as default disabled as long as text is empty (so nothing can be set)