To automatically format all the project's {cpp} files, run:
----
-$ ./tools/format-cpp
+$ ./tools/format-cpp.sh
+----
+
+Pass a directory path to only format the {cpp} files it contains:
+
+----
+$ ./tools/format-cpp.sh ./src/cli
----
Use the `FORMATTER` environment variable to override the default
formatter (`clang-format{nbsp}-i`):
----
-$ FORMATTER='clang-format-10 -i' ./tools/format-cpp
+$ FORMATTER='my-clang-format-15 -i' ./tools/format-cpp.sh
----
==== Naming