#!/bin/bash
#
# This file is part of the GROMACS molecular simulation package.
#
# Copyright (c) 2013,2014,2015,2019,2020,2021, by the GROMACS development team.
# Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
# and including many others, as listed in the AUTHORS file in the
# top-level source directory and at http://www.gromacs.org.
#
# GROMACS is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation; either version 2.1
# of the License, or (at your option) any later version.
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
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# License along with GROMACS; if not, see
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# the research papers on the package. Check out http://www.gromacs.org.

# This script is intended as a pre-commit hook that optionally runs all
# changes through some formatting check.  Currently, it runs clang-format and
# checks copyright headers.
#
# It needs to be copied as .git/hooks/pre-commit and configured with
#   git config hooks.clangformatpath /path/to/clang-format-7
#   git config hooks.clangformatmode check
#   git config hooks.copyrightmode update
#
# To disable the hook temporarily for a commit, set NO_FORMAT_CHECK environment
# variable.  For example,
#   NO_FORMAT_CHECK=1 git commit -a
# You can also run git commit --no-verify, but that also disables other hooks.
#
# See docs/dev-manual/code-formatting.rst for more details.

if [ ! -z "$NO_FORMAT_CHECK" ]
then
    exit 0
fi

if git rev-parse --verify HEAD >/dev/null 2>&1
then
    against=HEAD
else
    # Initial commit: diff against an empty tree object
    against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

# Redirect output to stderr.
exec 1>&2

clangtidy_mode=`git config hooks.clangtidymode`
clangformat_mode=`git config hooks.clangformatmode`
copyright_mode=`git config hooks.copyrightmode`
if [ -z "$clangtidy_mode" ]
then
    clangtidy_mode=off
fi
if [ -z "$clangformat_mode" ]
then
    clangformat_mode=off
fi
if [ -z "$copyright_mode" ]
then
    copyright_mode=off
fi

if [[ -f admin/clang-tidy.sh && \
      ( "$clangtidy_mode" != "off" ) ]]
then
    runclangtidy_path=`git config hooks.runclangtidypath`
    if [ -z "$runclangtidy_path" ]
    then
        echo "Please set the path to run-clang-tidy using 'git config hooks.runclangtidypath'."
        echo "Note that you should use clang-tidy-11 to get the same checking as in CI."
        exit 1
    fi
    export RUN_CLANG_TIDY="$runclangtidy_path"
    admin/clang-tidy.sh check-index --rev=$against \
        --tidy="$clangtidy_mode"
    stat=$?
    if [ $stat -eq 1 ] ; then
        exit 1
    elif [ $stat -ne 0 ] ; then
        echo "Source code checking with clang-tidy failed"
        exit 1
    fi
fi

if [[ -f admin/clang-format.sh && \
      ( "$clangformat_mode" != "off" ) ]]
then
    clangformat_path=`git config hooks.clangformatpath`
    if [ -z "$clangformat_path" ]
    then
        echo "Please set the path to clang-format using 'git config hooks.clangformatpath /path/to/clang-format'."
        echo "See https://manual.gromacs.org/current/dev-manual/code-formatting.html#gmx-clang-format"
        exit 1
    fi
    export CLANG_FORMAT="$clangformat_path"
    admin/clang-format.sh check-index --rev=$against \
        --format="$clangformat_mode"
    stat=$?
    if [ $stat -eq 1 ] ; then
        exit 1
    elif [ $stat -ne 0 ] ; then
        echo "Source code formatting check with clang-format failed"
        exit 1
    fi
fi

if [[ -f admin/copyright.sh && \
      ( "$copyright_mode" != "off" ) ]]
then
    admin/copyright.sh check-index --rev=$against \
        --copyright="$copyright_mode"
    stat=$?
    if [ $stat -eq 1 ] ; then
        exit 1
    elif [ $stat -ne 0 ] ; then
        echo "Copyright information check failed"
        exit 1
    fi
fi