Grond development environment and contribution guide

Language

Grond is written in the Python programming language (versions ==2.7 and >=3.4).

Deployment

Grond uses Setuptools for its installation script. See setup.py and setup.cfg in the project root directory.

Versioning and releases

Git is used for version control. Use development branches for new features. Master branch should always point to a stable version.

The Grond project adheres to Semantic Versioning.

Notable changes must be documented in the file CHANGELOG.md. The format of the change log is based on Keep a Changelog.

Commit message conventions

start with lower case
colon-prepend affected component
try to use imperative form
examples:
- docs: add section about weighting
- waveform targets: correct typo in component names
- waveform targets: fix issues with misaligned traces

Branching policy

The master branch should point to a stable, tagged version of Grond.
The dev branch is used to aggregate new features before releasing.
Use topic branches to develop new features.

Rebase small changes before pushing

Try to rebase little changes on top of master (or any other development branch) before pushing, it makes the history much better readable. Here is a safe way to do so.

If we have already commited and merged changes to local master:

git checkout master
git fetch origin    # important, otherwise we rebase to outdated
git rebase origin/master
git push origin master

with git config --global pull.rebase true this can be shortcutted to

git pull

Or after we have commited to a feature branch:

git checkout feature
git fetch origin
git rebase origin/master
git checkout master
git merge origin/master
git merge feature    # should now be fast forward...
git push origin master

If during push it refuses to upload ('not fast forward...') then repeat the procedure, because someone else has pushed between your fetch and push.

Tip: use rebase -i ... to simplify/fixup/beautify your changeset.

Code style

Grond source code must follow the PEP8 coding standards. It must pass the code style check provided by the flake8 tool.

Additionally,

use i/n convention for indices and counts
- e.g. for istation in range(nstations):
do not abbreviate words unless this would result in ridiculously long names
use British english, e.g.
- 'modelling' rather than 'modeling'
- 'analyser' rather than 'analyzer'
- 'optimiser' rather than 'optimizer'
log and exception messages:
- capital beginning
- final period
- Progress actions should end with ..., e.g. Generating report's archive...
- e.g. raise ProblemDataNotAvailable('No problem data available (%s).' % dirname)
- in-text names must be quoted; not needed after colons
docstrings: TODO

Documentation

Grond's documentation is built using the Sphinx tool. See the docs in the project root directory. Build with make html in docs.

Text style rules:

titles: only capitalize first word
use British english

License

GNU General Public License, Version 3, 29 June 2007

Grond is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Grond is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

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