How to ttx_diff

how_to_diff.sh

# starting from a directory with both fontc and oswald
git clone [email protected]:googlefonts/fontc.git
git clone [email protected]:googlefonts/OswaldFont.git

cd fontc
# establish a virtual environment
python3 -m venv venv
source venv/bin/activate
pip install -r resources/scripts/requirements.txt

# run ttx_diff on a minimal test file; at time of writing GDEF and GPOS differ
python resources/scripts/ttx_diff.py resources/testdata/glyphs3/Oswald-AE-comb.glyphs

# run ttx_diff on Oswald
python resources/scripts/ttx_diff.py ../OswaldFont/sources/Oswald.glyphs