CONTRIBUTING.rst

Contributing

We absolutely welcome contributions and we hope that this guide will facilitate an understanding of the PyIGES code repository. It is important to note that this PyVista software package is maintained on a volunteer basis and thus we need to foster a community that can support user questions and develop new features to make this software a useful tool for all users.

This page is dedicated to outline where you should start with your question, concern, feature request, or desire to contribute.

Being Respectful

Please demonstrate empathy and kindness toward other people, other software, and the communities who have worked diligently to build (un)related tools.

Please do not talk down in Pull Requests, Issues, or otherwise in a way that portrays other people or their works in a negative light.

Cloning the Source Repository

You can clone the source repository from https://github.com/pyvista/pyiges and install the latest version by running:

git clone https://github.com/pyvista/pyiges.git
cd pyiges
python -m pip install -e .

Reporting Bugs

If you stumble across any bugs, crashes, or concerning quirks while using code distributed here, please report it on the issues page with an appropriate label so we can promptly address it. When reporting an issue, please be overly descriptive so that we may reproduce it. Whenever possible, please provide tracebacks, screenshots, and sample files to help us address the issue.

Feature Requests

We encourage users to submit ideas for improvements to PyIGES code base. Please create an issue on the issues page with a Feature Request label to suggest an improvement. Please use a descriptive title and provide ample background information to help the community implement that functionality. For example, if you would like a reader for a specific file format, please provide a link to documentation of that file format and possibly provide some sample files with screenshots to work with. We will use the issue thread as a place to discuss and provide feedback.

Contributing New Code

If you have an idea for how to improve PyIGES, please first create an issue as a feature request which we can use as a discussion thread to work through how to implement the contribution.

Once you are ready to start coding and develop for PyIGES, please see the Development Practices section for more details.

Licensing

All contributed code will be licensed under The MIT License found in the repository. If you did not write the code yourself, it is your responsibility to ensure that the existing license is compatible and included in the contributed files or you can obtain permission from the original author to relicense the code.

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Development Practices

This section provides a guide to how we conduct development in the PyIGES repository. Please follow the practices outlined here when contributing directly to this repository.

Contributing to PyIGES through GitHub

To submit new code to PyIGES, first fork the pyiges GitHub Repository and then clone the forked repository to your computer. Then, create a new branch based on the Branch Naming Conventions Section in your local repository.

Next, add your new feature and commit it locally. Be sure to commit frequently as it is often helpful to revert to past commits, especially if your change is complex. Also, be sure to test often. See the Testing Section below for automating testing.

When you are ready to submit your code, create a pull request by following the steps in the Creating a New Pull Request section.

Coding Style

We adhere to PEP 8 wherever possible, except that line widths are permitted to go beyond 79 characters to a max of 99 characters for code. This should tend to be the exception rather than the norm. A uniform code style is enforced by black to prevent energy wasted on style disagreements.

As for docstrings, follow the guidelines specified in PEP 8 Maximum Line Length of limiting docstrings to 72 characters per line. This follows the directive:

Some teams strongly prefer a longer line length. For code maintained exclusively or primarily by a team that can reach agreement on this issue, it is okay to increase the line length limit up to 99 characters, provided that comments and docstrings are still wrapped at 72 characters.

Outside of PEP 8, when coding please consider PEP 20 - The Zen of Python. When in doubt:

import this

PyIGES uses pre-commit to enforce PEP8 and other styles automatically. Please see the Style Checking section for further details.

Documentation Style

PyIGES follows the Google Developer Documentation Style with the following exceptions:

• Allow first person pronouns. These pronouns (for example, "We") refer to "PyVista Developers", which can be anyone who contributes to PyVista.
• Future tense is permitted.

Docstrings

PyIGES uses Python docstrings to create reference documentation for our Python APIs. Docstrings are read by developers, interactive Python users, and readers of our online documentation. This section describes how to write these docstrings for PyIGES.

PyIGES follows the numpydoc style for its docstrings. Please follow the numpydoc Style Guide in all ways except for the following:

• Be sure to describe all Parameters and Returns for all public methods.
• We strongly encourage you to add an example section.
• With optional parameters, use default: <value> instead of optional when the parameter has a default value instead of None.

Sample docstring follows:

def slice_x(self, x=None, generate_triangles=False):
    """Create an orthogonal slice through the dataset in the X direction.

    Parameters
    ----------
    x : float, optional
        The X location of the YZ slice. By default this will be the X center
        of the dataset.

    generate_triangles : bool, default: False
        If this is enabled, the output will be all triangles. Otherwise the
        output will consist of the intersection polygons.

    Returns
    -------
    pyvista.PolyData
        Sliced dataset.

    Examples
    --------
    Slice the random hills dataset with one orthogonal plane.

    >>> from pyvista import examples
    >>> hills = examples.load_random_hills()
    >>> slices = hills.slice_x(5, generate_triangles=False)
    >>> slices.plot(line_width=5)

    See :ref:`slice_example` for more examples using this filter.

    """

    pass  # implementation goes here

Note the following:

• The parameter definition of generate_triangles uses default: False, and does not include the default in the docstring's "description" section.
• There is a newline between each parameter. This is different than numpydoc's documentation where there are no empty lines between parameter docstrings.
• This docstring also contains a returns section and an examples section.
• The returns section does not include the parameter name if the function has a single return value. Multiple return values (not shown) should have descriptive parameter names for each returned value, in the same format as the input parameters.
• The examples section references the "full example" in the gallery if it exists.

Branch Naming Conventions

To streamline development, we have the following requirements for naming branches. These requirements help the core developers know what kind of changes any given branch is introducing before looking at the code.

• fix/, patch/ and bug/: any bug fixes, patches, or experimental changes that are minor
• feat/: any changes that introduce a new feature or significant addition
• junk/: for any experimental changes that can be deleted if gone stale
• maint/: for general maintenance of the repository or CI routines
• doc/: for any changes only pertaining to documentation
• no-ci/: for low impact activity that should NOT trigger the CI routines
• testing/: improvements or changes to testing
• release/: releases (see below)
• breaking-change/: Changes that break backward compatibility

Testing

After making changes, please test changes locally before creating a pull request. The following tests will be executed after any commit or pull request, so we ask that you perform the following sequence locally to track down any new issues from your changes.

To run our comprehensive suite of unit tests, install all the dependencies listed in requirements_test.txt and requirements_docs.txt:

pip install -r requirements_test.txt
pip install -r requirements_docs.txt

Then, if you have everything installed, you can run the various test suites.

Unit Testing

Run the primary test suite and generate coverage report:

python -m pytest -v --cov pyiges

Style Checking

PyIGES follows PEP8 standard as outlined in the Coding Style section and implements style checking using pre-commit.

To ensure your code meets minimum code styling standards, run:

pip install pre-commit
pre-commit run --all-files

If you have issues related to setuptools when installing pre-commit, see pre-commit Issue #2178 comment for a potential resolution.

You can also install this as a pre-commit hook by running:

pre-commit install

This way, it's not possible for you to push code that fails the style checks. For example, each commit automatically checks that you meet the style requirements:

$ pre-commit install
$ git commit -m "added my cool feature"
black....................................................................Passed
isort....................................................................Passed
flake8...................................................................Passed
codespell................................................................Passed

The actual installation of the environment happens before the first commit following pre-commit install. This will take a bit longer, but subsequent commits will only trigger the actual style checks.

Even if you are not in a situation where you are not performing or able to perform the above tasks, you can comment pre-commit.ci autofix on a pull request to manually trigger auto-fixing.