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How to generate new metrics

There are several requirements for generating the metrics used by KaTeX.

  • You need to have an installation of TeX which supports kpathsea. You can check this by running tex --version, and seeing if it has a line that looks like

    kpathsea version 6.2.0

  • You need the Perl module JSON. You can install this either from CPAN (e.g. using the cpan command line tool: cpan install JSON) or with your package manager.

  • You need the Python module fonttools. You can install this either from PyPI (using easy_install or pip: pip install fonttools) or with your package manager.

Once you have these things, run

sh buildMetrics.sh

which should generate new metrics and place them into fontMetricsData.json. You're done!