How to call clang-format over a cpp project folder?

What about:

clang-format -i -style=WebKit *.cpp *.h

in the project folder. The -i option makes it inplace (by default formatted output is written to stdout).

Unfortunately, there is no way to apply clang-format recursively. *.cpp will only match files in the current directory, not subdirectories. Even **/* doesn't work.

Luckily, there is a solution: grab all the file names with the find command and pipe them in. For example, if you want to format all .h and .cpp files in the directory foo/bar/ recursively, you can do

find foo/bar/ -iname *.h -o -iname *.cpp | xargs clang-format -i

See here for additional discussion.