opentelemetry-cpp/docs/using-clang-format.md

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# Using clang-format
## Command-line use
To format a file according to Coding style using command line, please setup the
build tools environment first.
For Windows - cmd.exe command:
```call tools\setup-devenv.cmd```
For Linux and Mac:
```. tools/setup-devenv.sh```
Command will add the tools from repo *tools* directory to PATH environment
variable.
Then run:
```git cl format <filename>```
At the moment the tool requires you to specify the path to file you want to
format. Long-term goal is to integrate the [clang-format from
Chromium](https://chromium.googlesource.com/chromium/src/+/master/docs/clang_format.md)
to automatically format all source code files being changed.
## Alternative
Run: `tools/format.sh`
Or, via Docker: `./ci/run_docker.sh ./ci/do_ci.sh format`
## Editor integrations
For further guidance on editor integration, see these specific pages:
* [Download link for LLVM tools for
Windows](https://releases.llvm.org/9.0.0/LLVM-9.0.0-win64.exe)
* [LLVM tools extension for Visual
Studio](https://marketplace.visualstudio.com/items?itemName=LLVMExtensions.llvm-toolchain)
* [Visual Studio code
extension](https://marketplace.visualstudio.com/items?itemName=xaver.clang-format)
* [CppStyle Eclipse CDT
extension](https://marketplace.eclipse.org/content/cppstyle)
## Are robots taking over my freedom to choose where newlines go
No. For the project as a whole, using clang-format is just one optional way to
format your code. While it will produce style-guide conformant code, other
formats would also satisfy the style guide. For certain modules it may be
appropriate to use alternate coding style. In those scenarios a local directory
*.clang-format* settings file takes precedence over the one at top-level.