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clang-format

We use clang-format to keep formatting in the code base consistent. Please run clang-format on your patches before submitting.

clang-format ships with a python script ```clang/tools/clang-format-diff.py`` that can be used to reformat patches. For example the following command will reformat all the lines in the latest commit

git diff -U0 HEAD^ | clang-format-diff.py -i -p1

clang-format also provides git-clang-format, a script that more closely integrates with git. If you add this script to your path you can using the following command to reformat all the lines in the latest commit.

git clang-format HEAD~1

flake8

We use flake8 to test for Python style compliance. The tests are run when a PR is raised against the repository. You can also run flake8 locally to reveal problems before you push a branch. First you need to install flake8, the simplest way todo this is using pip.

pip install flake8

To run flake8 using the project configuration file.

cd <tomviz_source_dir>
flake8 --config=flake8.cfg .
# Or a specific file
flake8 --config=flake8.cfg tomviz/python/InvertData.py

There is also autopep8 that can be using to automatically fix many of the problems raised by flake8. Again is can be install using pip.

pip install autopep8

To run autopep8 using the project configuration file.

cd <tomviz_source_dir>
# It is recommended to run it on specfic file(s) you have changed, for example.
autopep8 --ignore E262,E261,E265 --global-config flake8.cfg --in-place tomviz/python/InvertData.py

clang-format-diff locations by platform

The exact location of the Python script varies by platform/distro. The table below provides the location on some common platform/distro's

Platform/Distro. Location
Arch Linux /usr/share/clang/clang-format-diff.py
Ubuntu /usr/bin/clang-format-diff-3.8

The script can also be downloaded here.

Code style

This project is developed primarily in C++ and Python. Please follow these code style guidelines when contributing code to our project.

  • Alphabetize includes

  • Use #include "xxx" for local includes, #include for external includes.

  • Do not add comment separators before function definitions.

  • Split long when reasonable lines to avoid going over 80 characters per line.

  • Add a space after the commas in parameter lists, e.g., function(a, b, c), not function(a,b,c)

  • Add spaces between operators, e.g. 5 - 2, not 5-2.

  • For local variables, use camelCase, starting variable names with a lower-case letter.

  • For comments, add a space between // and the beginning of the comment, e.g.,

    • // A comment
    • # Python comment

  • Use 2 spaces when indenting C++ code, 4 spaces for Python code.

  • Do not indent inside namespaces, e.g.,

      namespace tomviz {
  void foo();

  • Curly braces marking the start and end of a code block should be on separate lines and aligned vertically with the statement preceding the block, e.g.,

      if (condition) {
    statement;
  }

  for (int i = 0; i < n; ++i) {
    statement;
  }

  • Assume that C++11 features are available, and prefer them over legacy macros, defines, etc. A few examples follow, but are not exhaustive.

    • Use override to specify member overrides in derived classes.
    • Set default values of member variables directly in definitions.
    • Use nullptr instead of NULL.

  • When creating VTK subclasses please follow the tomviz style outlined here.