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source-foundry / fdiff

An OpenType table diff tool for fonts. Based on the fontTools TTX format.
Apache License 2.0
41 stars 5 forks source link

Default to external diff? #229

Open behdad opened 2 years ago

behdad commented 2 years ago

fdiff is great!

Internal python diff is way too slow on large strings. Maybe default to external unix diff command if available? That one is instantanous.

behdad commented 2 years ago

Eg. for comparing two fonts which are similar except for a couple lines, with ttx that is 53MB, fdiff by default takes ... well, I interrupted it after 4 minutes.

With external diff it takes 5s, most of which is the conversion to ttx. Diffing the ttx'es using unix diff takes only .3s.