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# fontTools Documentation
The fontTools project documentation updates continuously on Read the Docs as the project source changes.
The documentation is hosted at https://fonttools.readthedocs.io/.
## Contents
- [How to Build Local Documentation](#how-to-build-local-documentation)
- [Contributing to the fontTools Documentation](#contributing-to-the-documentation)
- [Documentation License](#documentation-license)
## How to Build Local Documentation
### Install Dependencies
You must have a Python 3 interpreter and the `pip` Python package manager installed on your system to build the fontTools documentation.
Pull the fontTools project source files, create a Python virtual environment, and then install fontTools and the documentation build dependencies by executing the following commands in the root of the fontTools source repository:
```
$ pip install -e . [all]
$ pip install -r Doc/docs-requirements.txt
```
### Build Documentation
**With `make`**: execute the following command in the root of the repository:
```
$ make docs
```
**Without `make`**: execute the following command in the **`Doc` directory**:
```
$ sphinx-build -b html source build
```
Open the `Doc/build/html/index.html` file in your browser to view the documentation home page.
## Contributing to the Documentation
We highly encourage contributions! Please follow the instructions below to improve the documentation.
### Python Docstring Style
We recommend the use of Python docstrings that follow [the Google Style Guide](https://github.com/google/styleguide/blob/gh-pages/pyguide.md#381-docstrings). Our documentation build approach parses appropriately formatted docstrings into formatted documentation files.
#### Function Documentation Example
```python
def fetch_bigtable_rows(big_table, keys, other_silly_variable=None):
"""Fetches rows from a Bigtable.
Retrieves rows pertaining to the given keys from the Table instance
represented by big_table. Silly things may happen if
other_silly_variable is not None.
Args:
big_table: An open Bigtable Table instance.
keys: A sequence of strings representing the key of each table row
to fetch.
other_silly_variable: Another optional variable, that has a much
longer name than the other args, and which does nothing.
Returns:
A dict mapping keys to the corresponding table row data
fetched. Each row is represented as a tuple of strings. For
example:
{'Serak': ('Rigel VII', 'Preparer'),
'Zim': ('Irk', 'Invader'),
'Lrrr': ('Omicron Persei 8', 'Emperor')}
If a key from the keys argument is missing from the dictionary,
then that row was not found in the table.
Raises:
IOError: An error occurred accessing the bigtable.Table object.
"""
```
*Source: [Google Style Guide](https://github.com/google/styleguide/blob/gh-pages/pyguide.md) (CC BY-SA 3.0)*
#### Class Documentation Example
```python
class SampleClass(object):
"""Summary of class here.
Longer class information....
Longer class information....
Attributes:
likes_spam: A boolean indicating if we like SPAM or not.
eggs: An integer count of the eggs we have laid.
"""
def __init__(self, likes_spam=False):
"""Inits SampleClass with blah."""
self.likes_spam = likes_spam
self.eggs = 0
def public_method(self):
"""Performs operation blah."""
```
*Source: [Google Style Guide](https://github.com/google/styleguide/blob/gh-pages/pyguide.md) (CC BY-SA 3.0)*
### Build Local Documentation and Review Your Changes
Build a local set of HTML documentation files with the instructions above and review your changes.
### Submit a Pull Request
Submit a Github pull request with your proposed improvements to the documentation.
Thanks for your contribution!
## Documentation License
The fontTools documentation is released under a [CC BY-SA 4.0 International License](https://creativecommons.org/licenses/by-sa/4.0/).