Map all FontBakery dependencies and try to minimize the dependency tree

[felipesanches]

FontBakery depends on a whole bunch of third-party python modules and other external programs.

The goal here is to map them all listing which tests or fixer scripts rely on each.

[felipesanches]

I'll keep updating this comment with the full list.

External programs

dependency	used in	to do what?
ttfautohint	com.google.fonts/test/054, com.google.fonts/test/056	calculate the filesize impact of hinting vs non-hinted font files
ots-sanitize	com.google.fonts/test/036	OpenType Sanitizer
Mono + custom freetype + Microsoft Font Validator	com.google.fonts/test/037	complementary testsuite (including raster tests)
python-fontforge	com.google.fonts/test/038, com.google.fonts/test/039	complementary testsuite
ftxvalidator	com.google.fonts/test/035	complementary testsuite

python modules

dependency	used in	to do what?
pip install BeautifulSoup4	com.google.fonts/test/018	for parsing Microsoft's VendorIDs webpage
pip install requests	com.google.fonts/test/081	for fetching Google Font API
	com.google.fonts/test/117, com.google.fonts/test/118, com.google.fonts/test/119 and com.google.fonts/test/154	for fetching current font files of a given family from Google Fonts production servers
	com.google.fonts/test/003	for validating whether URLs on a description.en_us.html file are broken or not
pip install protobuf	several tests	for handling METADATA.pb files
pip install unidecode	com.google.fonts/test/018, com.google.fonts/test/029, com.google.fonts/test/102, com.google.fonts/test/103, com.google.fonts/test/159, com.google.fonts/test/160, com.google.fonts/test/161, com.google.fonts/test/162 and com.google.fonts/test/163	for unicode transliterations into ASCII (We should be able to ditch this one after a future migration into python 3)
pip install lxml and pip install defusedxml	com_google_fonts_test_037	for parsing MSFontVal xml test results report file
	com.google.fonts/test/003	for parsing description.en_us.html
pip install git+https://github.com/behdad/fonttools.git	used EVERYWHERE!	for EVERYTHING!

code linters & code testing framework

dependency	used in	to do what?
pip install pylint	locally or on TravisCI	code linter
pip install flake8	locally or on TravisCI	code linter
pip install pytest	locally or on TravisCI	running the code-tests

dependencies only required for our helper scripts

dependency	used in	to do what?
pip install glyphsLib	bin/fontbakery-fix-glyphs.py and bin/fontbakery-list-variable-source.py
pip install GitPython==0.3.2.RC1	bin/fontbakery-build-contributors.py	Generate a CONTRIBUTORS.txt document from a repository's git history.
pip install tabulate	bin/fontbakery-check-bbox.py, bin/fontbakery-check-name.py, bin/fontbakery-fix-familymetadata.py, bin/fontbakery-fix-fsselection.py, bin/fontbakery-fix-nameids.py, bin/fontbakery-list-panose.py, bin/fontbakery-list-weightclass.py and bin/fontbakery-list-widthclass.py	formatting tables on the output of some of our helper scripts

[graphicore]

Awesome, this will also be helpful to remove dependencies that we don't use anymore. AFAIK requirements.txt/setup.py has such.

[davelab6]

#1523 seems related

[felipesanches]

This is done! The dependencies were systematically mapped above and with that we removed any left-over dependencies (that were used in the past, but removed later but mistakenly remained in setup.py or requirements.txt).