check_format.sh

#!/bin/bash
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EXIT_CODE=0
echo "\
############################################################################
Checking formatting of modified files. It is expected that the files were
formatted with clang-format 8.0.0. It is also expected that clang-format
version 8.0.0 is used for the check. Otherwise the result can ne unexpected.
############################################################################"

CLANG_FORMAT="clang-format"
REQUIRED_VERSION="8.0.0"
VERSION_STRING="$CLANG_FORMAT version $REQUIRED_VERSION .*"
CURRENT_VERSION="$(clang-format --version)"
if ! [[ $CURRENT_VERSION =~ $VERSION_STRING ]] ; then
    echo WARNING: $CLANG_FORMAT version $REQUIRED_VERSION is required but $CURRENT_VERSION is used.
    echo The results can be unexpected.
fi

LAST_REVISION=`git rev-parse HEAD`
# Get the list of changed files, ignore deleted
CHANGED_FILES=`git diff-tree --no-commit-id --name-only -r $LAST_REVISION --diff-filter=RCMA | grep -E "\.(cpp|h|c)$"`
for FILE in $CHANGED_FILES; do
    $CLANG_FORMAT $FILE | cmp  $FILE >/dev/null
    if [ $? -ne 0 ]; then
        echo "[!] INCORRECT FORMATTING! $FILE" >&2
            EXIT_CODE=1
        fi
    done
if [ $EXIT_CODE -eq 0 ]; then 
    echo "No formatting issues found"
fi
exit $EXIT_CODE