#!/usr/bin/env bash

# Allow the caller to specify a particular version of clang-format to use:
: "${CLANG_FORMAT_CMD:=clang-format}"

# Find all *.cpp and *.h files, except those in `testing/googletest/` and files
# generated by testcase scripts, and run `clang-format` on them:
find ./* -type f \( -name '*.h' -o -name '*.cpp' \) \
     -not \( -path './testing/googletest/*' -o -name 'generated-testcase.cpp' \) \
     -print0 | \
    xargs -0 "${CLANG_FORMAT_CMD}" -i

# If we get the `--check` option, return an error if there are any changes to
# the git working tree after running `clang-format`:
if [[ $1 == '--check' ]]; then

    if ! git diff --quiet; then
        cat >&2 <<EOF
Differences found between git head and working tree.  Either 'clang-format' made
formatting changes to your code, or you had uncommitted changes in your working
tree.  Please remember to run 'bin/format-code.sh' before committing changes.
EOF
        exit 1
    fi
fi