Don't use this. Instead, look into integrating clang-format into your editor.

• Emacs: https://clang.llvm.org/docs/ClangFormat.html
• SublimeText: https://github.com/rosshemsley/SublimeClangFormat
• Vim: https://github.com/rhysd/vim-clang-format
• Visual Studio: https://llvm.org/builds/, or use the integrated support in Visual Studio 2017
• Xcode: https://github.com/travisjeffery/ClangFormat-Xcode

Alternatively look into a pre-commit framework such as pre-commit which makes it easier to manage these hooks. An example hook for clang-format is at clang-format-precommit.

This script will automatically run clang-format on all changed files in a commit when set as a pre-commit hook. Proceed with caution.

Do not use this on an existing codebase that isn't already in your desired style. Doing so will lead to a string a dirty commits where your code changes are intermixed with clang-format's formatting changes.

Furthermore, every developer will need to install this hook. If they don't, you will again end up with commits with a mixture of code and formatting changes.

First, verify that clang-format is installed. On Linux this should be included with the regular clang package. For MacOSX with Homebrew, clang-format is available via brew install clang-format.

Now install clang-format.hook from this repository into your repo's .git/hooks. If you don't already have a pre-commit hook, you can simply copy clang-format.hook to .git/hooks/pre-commit. For example:

cp githook-clang-format/clang-format.hook myrepo/.git/hooks/pre-commit

Once the pre-commit hook is installed, clang-format will be run on each file included in the commit when you run git commit.

By default, clang-format uses the LLVM style. To change this, either create a .clang-format file with your desired format in the top level of your repo, or set the hooks.clangformat.style config option in your repo. The .clang-format file method is preferred if you will be working with a team or will be doing any major customizations to the style.

You can generate the .clang-format file from your desired style (here, llvm) using:

clang-format -style=llvm -dump-config > .clang-format

To use the git config method, inside your repo do:

git config hooks.clangformat.style llvm