<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/100706>100706</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            git-clang-format script does not support double extensions like C++ input file *.hpp.in or *.cpp.in for CMake configure_file()
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang-format
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          alexramzy
      </td>
    </tr>
</table>

<pre>
    https://github.com/llvm/llvm-project/blob/92a06546ab50c2b6beac766d989b30960c353e61/clang/tools/clang-format/git-clang-format#L391

**Fix Request:**

Please add support for double extensions generally.

**Rationale:** 

In CMake project you can use [configure_file](https://cmake.org/cmake/help/latest/command/configure_file.html) extensively to generate actual C++ code from input C++ code source "template" which according to CMake convention normally should be suffixed with `*.in`, hence double extensions like `*.hpp.in` and `*.cpp.in` are quite legal and same `clang-format` checks should be applicable to those files using `git-clang-format` script (e.g. in pre-commit Git hook or manually).
</pre>
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