Source Code Contributor Guide
Contributions to the Font Bakery source code are welcomed! Please read and follow the instructions in Getting Started as a Contributor and then use the instructions below to set up a source code development environment.
Please note that the required dependencies are different for documentation development and source code development. Please see the Documentation Contributor Guide if you are attempting to improve our docs!
Create a Font Bakery Development Environment
You must have a Python 3 interpreter and the
pip Python package
manager installed on your system to participate in Font Bakery
Clone the Font Bakery Source Repository
Pull the source repository with the following command:
$ git clone https://github.com/googlefonts/fontbakery.git
and navigate to the root of the repository with:
$ cd fontbakery
Create a Python Virtual Environment
Execute the following command in the root of the Font Bakery source repository to create a Python virtual environment for development and testing:
$ python3 -m venv fontbakery-venv
Activate Virtual Environment and Install Font Bakery
Activate the Python virtual environment with:
$ source fontbakery-venv/bin/activate
Next, install the Font Bakery source in editable mode with:
$ pip install -e .
Please note that there are optional non-Python dependencies that must be installed to execute some features in the Font Bakery project. Please see the Installation Guides for additional details.
You are now ready to modify the Font Bakery source files and test your changes.
When your work is complete, deactivate the virtual environment with the following command:
Custom Font Bakery Profiles
Please see Writing Profiles for instructions on how to write custom Font Bakery profiles.
Source Code Testing
check-googlefonts provides over 130 checks for fonts and
families according to the quality requirements of the Google Fonts team.
In addition to a complete architectural overhaul, release 0.3.1
introduced a set of code tests to assure the quality of the Font Bakery
suite of checks. We aim to reach 100% test coverage.
You can find test line coverage data at the end of the testing report that is executed for any Travis CI job
In order to run the tests you need to have the
and Python interpreter versions that are defined for testing installed.
tox in your virtual environment with:
$ pip install tox
Install Python Testing Versions
You can find the versions of the Python interpreter that are used for
testing in the
tox.ini file. This file is located in the root of the
Font Bakery repository.
Execute Source Code Test Suite
Use the following command in the root of the source repository to execute the Font Bakery test suite:
Propose Source Code Changes
All proposals for source code modifications, including submissions by project members, require a review process. We use GitHub pull requests for this purpose. Consult GitHub Help for more information on using pull requests to submit your changes for review.
The test suite that you execute locally with
tox is executed by
the Travis CI testing service when you submit a pull request to the
repository. Please add new tests that cover your source changes with all
proposals. Pull requests cannot be merged if any test fails as a result
of your modifications.
Please submit tests that cover all source code changes in your pull request!
The Travis CI build logs can be viewed at https://travis-ci.org/googlefonts/fontbakery.
The source code is licensed under the Apache v2.0 License.