Run filter from CLI

[simoncozens]

This allows the user to run a ufo2ft filter (or filters) on a UFO file and save it from the command line. This is helpful for testing and debugging filters, as well as doing general filter-based operations on fonts.

$ python3 -m ufo2ft.filters ../glyphsLib/master_ufo/Nunito-M1000.ufo glyphsLib.filters.eraseOpenCorners
INFO:ufo2ft.filters:Running EraseOpenCornersFilter on Nunito-M1000
INFO:ufo2ft.filters:Written on ../glyphsLib/master_ufo/Nunito-M1000#1.ufo

[anthrotype]

This is very useful, thanks!

[anthrotype]

do you mind switching to ufoLib2 instead? or try ufoLib2 then defcon then ImportError

[moyogo]

You can use loadFilterFromString() now that #466 has been merged.

[anthrotype]

You can use loadFilterFromString() now that #466 has been merged.

good point, yes please

[moyogo]

LGTM

[anthrotype]

I modified this slightly to set the include/exclude attribute on the filter instance after it has been initialized from the CLI string, this way we can support initializing the filter not only using the filter class name but also with optional keyword arguments

$ python -m ufo2ft.filters tests/data/TestFont.ufo 'CubicToQuadraticFilter(reverseDirection=False)'

d15836d