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from glyphsLib import load, to_designspace
from ufo2ft.featureCompiler import FeatureCompiler, parseLayoutFeatures
from fontTools.feaLib import ast
import argparse
class Checker:
def __init__(self, sources):
self.masters = []
for source in sources:
self.masters.append(
{
"ufo": source.font,
"name": source.name,
"compiler": FeatureCompiler(source.font),
}
)
self.masters[-1]["writers"] = self.masters[-1]["compiler"].featureWriters
def check_all_the_same(self, items, description, print_items=None):
if all(i == items[0] for i in items[1:]):
return True
print(" MERGE PROBLEM: Not all masters " + description + ":")
if print_items is not None:
items = print_items
for master, item in zip(self.masters, items):
print(" %s: %s" % (master["name"], item))
print("\n")
return False
parser = argparse.ArgumentParser(description="Debug a merge error in a Glyphs file")
parser.add_argument(
"glyphs_file", metavar="glyphs_file", type=str, help="The Glyphs file to debug"
)
args = parser.parse_args()
print("Converting to UFO")
ds = to_designspace(load(args.glyphs_file), minimal=True)
checker = Checker(ds.sources)
for writers in zip(*[m["writers"] for m in checker.masters]):
features = writers[0].features
# Start a new feature file for each master
written = []
for writer, master in zip(writers, checker.masters):
master["featurefile"] = parseLayoutFeatures(master["ufo"])
written.append(writer.write(master["ufo"], master["featurefile"]))
if not written[0]:
continue
print(
"Checking compatibility of %s feature%s"
% ("/".join(features), "s" if len(features) > 1 else "")
)
if not checker.check_all_the_same(
["yes" if w else "no" for w in written], " had this feature"
):
continue
# Now check compatibility of each feature file. Normally the problem is
# incompatible lookups
feature_files = [m["featurefile"] for m in checker.masters]
lookups_by_name = [
{s.name: s for s in f.statements if isinstance(s, ast.LookupBlock)}
for f in feature_files
]
all_lookup_names = set()
for names in lookups_by_name:
all_lookup_names.update(names.keys())
for lookup in all_lookup_names:
checker.check_all_the_same(
["yes" if lookup in my_lookups else "no" for my_lookups in lookups_by_name],
"had a %s lookup" % lookup,
print_items=[
my_lookups[lookup].asFea() if lookup in my_lookups else "<Missing>"
for my_lookups in lookups_by_name
],
)
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