The Format library has no way to specify a specific file to be used as the style source. It climbs the path looking for ‘.clang_format’. This patch adds the ability to specify a specific file to use for clang Format utilities.
This patch is in direct response to https://bugs.llvm.org//show_bug.cgi?id=28107 (along with my own personal need).
New style argument feature:
Use -style=file,<filename> to load style configuration from an explicitly defined file.