For this we are using clang format version 18. All the config for this is in the .clang-format file.

Formatting the whole project

Pre-built clang-format 18 binaries are provided for all platforms. To indent the entire project, run the appropriate script from the root of the repository:

Linux/Mac:

./format-code.sh

Windows (PowerShell):

.\format-code.ps1

⚠️ Before pushing, always run the provided script above. IDE-integrated clang-format (VS Code, CLion, etc.) may produce different formatting results even at the same version and with the same .clang-format file, which can cause the GitHub format-check pipeline to fail.

VS Code

Make sure you have C/C++ extension by Microsoft installed and it should automatically pick up your .clang-format file. You can use the IDE's auto-indent while developing, but do not rely on it as a substitute for the provided script before committing.

CLion

CLion has built in clang-format, just press Ctrl + Shift + L (Windows and Linux) to auto-indent while developing with the .clang-format configure file within project directory. However, do not rely on it as a substitute for the provided script before committing. Note: KDE default keymap is Alt + Shift + L

Maintainer: Managing and Updating clang-format Binaries

The pre-built binaries are stored under tools/clang-format-bin/<version>/ with one subdirectory per supported platform:

tools/clang-format-bin/
└── 18.1.8/
    ├── linux-x86_64/
    │   ├── clang-format
    │   └── lib/libtinfo.so.5
    ├── linux-arm64/
    │   ├── clang-format
    │   └── lib/libtinfo.so.5
    ├── macos-arm64/
    │   └── clang-format
    └── windows-x86_64/
        └── clang-format.exe

The root format-code.sh and format-code.ps1 scripts delegate to tools/clang-format.sh and tools/clang-format.ps1 respectively, which automatically select the correct binary for the current OS and architecture.

Updating the clang-format version

1. Edit tools/fetch-clang-format.sh and update the version number.
2. Run the script, it will download the binaries and create the appropriate versioned directories under tools/clang-format-bin/. Note that downloading from the LLVM project servers can take a while.
3. Test each downloaded binary. Some platforms may require additional libraries (e.g. libtinfo.so.5 for Linux). If so, provide the library in a lib/ subdirectory alongside the binary. tools/get_libtinfo_linux_x86_64_arm64.sh has been left as a reference example, you can copy and adjust it for any future library needs.
4. Edit tools/clang-format.sh and tools/clang-format.ps1 and set the version to the newly downloaded one.

Multiple versions of the binaries can coexist under tools/clang-format-bin/. The active version is whichever is set in tools/clang-format.sh and tools/clang-format.ps1, making it easy to switch between versions as needed.