#!/bin/bash
# Copyright lowRISC contributors.
# Licensed under the Apache License, Version 2.0, see LICENSE for details.
# SPDX-License-Identifier: Apache-2.0

# A wrapper around clang-format, used for CI.
#
# Expects a single argument, which is the pull request's target branch
# (usually "master").

set -e

if [ $# != 1 ]; then
    echo >&2 "Usage: clang-format.sh <tgt-branch>"
    exit 1
fi
tgt_branch="$1"

merge_base="$(git merge-base origin/$tgt_branch HEAD)" || {
    echo >&2 "Failed to find fork point for origin/$tgt_branch."
    exit 1
}
echo "Running C/C++ lint checks on files changed since $merge_base"

TMPFILE="$(mktemp)" || {
    echo >&2 "Failed to create temporary file"
    exit 1
}
trap 'rm -f "$TMPFILE"' EXIT

set -o pipefail
git diff -U0 "$merge_base" -- "*.cpp" "*.cc" "*.c" "*.h" ':!*/vendor/*' | \
    clang-format-diff -p1 | \
    tee "$TMPFILE"
if [ -s "$TMPFILE" ]; then
    echo -n "##vso[task.logissue type=error]"
    echo "C/C++ lint failed. Use 'git clang-format' with appropriate options to reformat the changed code."
    exit 1
fi