.ci/format/apply_clang_format.sh: introduced file

.ci/format/apply_clang_format.sh

+#!/bin/bash
+
+if [ -z "${CLANG_FORMAT_BIN}" ]; then
+    if [ -z "${CLANG_COMPILER_VERSION}" ]; then
+        echo "ERROR: Please either set the environment variable CLANG_COMPILER_VERSION or CLANG_FORMAT_BIN accordingly"
+        exit 1
+    fi
+
+    CLANG_FORMAT_BIN="clang-format-${CLANG_COMPILER_VERSION}"
+fi
+
+if ! command -v "${CLANG_FORMAT_BIN}" >/dev/null 2>&1; then
+    echo "ERROR: Binary '${CLANG_FORMAT_BIN}' does not exist, please either set the environment variable CLANG_FORMAT_BIN or CLANG_COMPILER_VERSION to the correct clang-format version."
+    exit 1
+fi
+
+format_command="${CLANG_FORMAT_BIN} -i"
+
+apply_format_script="$(dirname "${BASH_SOURCE[0]}")/apply_format.sh"
+
+files_regex=".*\.(c|h)(pp)?$"
+
+if ! "${apply_format_script}" --format-command "${format_command}" --files-regex "${files_regex}" "$@"; then
+    echo "ERROR: Executing '${apply_format_script}' failed."
+    exit 1
+fi