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docs: clang-format instructions in CONTRIBUTING.md 

Document installation, command line usage, editors, etc.
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Martin Probst 2015-06-19 16:30:03 -07:00
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CONTRIBUTING.md
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@ -139,6 +139,19 @@ To ensure consistency throughout the source code, keep these rules in mind as yo
[Google's JavaScript Style Guide][js-style-guide]:
* Wrap all code at **100 characters**.
### <a name="clang-format">clang-format</a>
The Angular project uses [`clang-format`](http://clang.llvm.org/docs/ClangFormat.html) to
automatically format its source and enforce the common coding style. A couple of tips:
* Install clang-format with `npm install -g clang-format`.
* Use `clang-format -i [file name]` to format a file (or multiple).
* Use `gulp enforce-format` to check if your code is `clang-format` clean. This also gives
you a command line to format your code.
* `clang-format` also includes a git hook, run `git clang-format` to format all files you
touched.
* `clang-format` integrations are available for many popular editors (`vim`, `emacs`,
`Sublime Text`, etc.)
## <a name="commit"></a> Commit Message Guidelines
We have very precise rules over how our git commit messages can be formatted. This leads to **more