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#!/bin/sh
#
# This script executes clang-format in the following order:
#
# 1. If environment variable CLANG_FORMAT is set, execute $CLANG_FORMAT.
# 2. Otherwise, if <ccache-top-dir>/misc/.clang-format-exe exists, execute that
# program.
# 3. Otherwise, download a statically linked clang-format executable, verify its
# integrity, place it in <ccache-top-dir>/misc/.clang-format-exe and execute
# it.
set -eu
if [ -n "${CLANG_FORMAT:-}" ]; then
exec "$CLANG_FORMAT" "$@"
fi
top_dir="$(dirname "$0")"
clang_format_exe="$top_dir/.clang-format-exe"
clang_format_version=10
url_prefix="https://github.com/muttleyxd/clang-tools-static-binaries/releases/download/master-22538c65/clang-format-${clang_format_version}_"
if [ ! -x "$clang_format_exe" ]; then
case "$(uname -s | tr '[:upper:]' '[:lower:]')" in
*mingw*|*cygwin*|*msys*)
url_suffix=windows-amd64.exe
checksum=0b21dfb9041437eebcc44032096e4dfba9ee7b668ee6867ada71ea3541f7b09657ea592a5b1cf659bc9f8072bdc477dfc9da07b3edacb7834b70e68d7a3fc887
;;
*darwin*)
url_suffix=macosx-amd64
checksum=8458753e13d3cbb7949a302beab812bed6d9dd9001c6e9618e5ba2e438233633ae04704a4e150aa2abfbaf103f1df4bc4a77b306012f44b37e543964bd527951
;;
*linux*)
url_suffix=linux-amd64
checksum=3c4aaa90ad83313a1d7b350b30f9ad62578be73241f00f7d6e92838289e0b734fab80dee9dfcbd1546135bdb4e3601cfb2cf6b47360fba0bfc961e5a7cab2015
;;
*)
echo "Error: Please set CLANG_FORMAT to clang-format version $clang_format_version" >&2
exit 1
;;
esac
url="$url_prefix$url_suffix"
if command -v wget >/dev/null; then
wget -qO "$clang_format_exe.tmp" "$url"
elif command -v curl >/dev/null; then
curl -so "$clang_format_exe.tmp" -L --retry 20 "$url"
else
echo "Error: Neither wget nor curl found" >&2
exit 1
fi
if ! command -v sha512sum >/dev/null; then
echo "Warning: sha512sum not found, not verifying clang-format integrity" >&2
elif [ "$(sha512sum "$clang_format_exe.tmp" | awk '{print $1}')" != "$checksum" ]; then
echo "Error: Bad checksum of downloaded clang-format" >&2
exit 1
fi
chmod +x "$clang_format_exe.tmp"
mv "$clang_format_exe.tmp" "$clang_format_exe"
fi
exec "$clang_format_exe" "$@"
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