#!/bin/bash
#
# This file is part of the GROMACS molecular simulation package.
#
# Copyright (c) 2013, by the GROMACS development team, led by
# 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.
#
# GROMACS is distributed in the hope that it will be useful,
# 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.
#
# You should have received a copy of the GNU Lesser General Public
# License along with GROMACS; if not, see
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
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# To help us fund GROMACS development, we humbly ask that you cite
# 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 uncrustify and
# checks copyright headers.
#
# By default, it does nothing.  To enable the script after copying it to
# .git/hooks/pre-commit, you need to set
#   git config hooks.uncrustifymode check
#   git config hooks.uncrustifypath /path/to/uncrustify
# With this configuration, all source files modified in the commit are run
# through uncrustify and checked for correct copyright headers
# (see admin/uncrustify.sh for how this set of files is determined).
# If any file is changed by uncrustify or has other problems, the names of
# those files are reported and the commit is prevented.  The issues can be
# fixed by running admin/uncrustify.sh manually.
#
# To disable the hook, you can set
#   git config hooks.uncrustifymode off
# To disable it 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,
# such as the Change-Id hook used by gerrit.
#
# The actual work is done by the admin/uncrustify.sh script, which gets
# run with the 'check-index' action.
# See the comments in that script for more information.

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

uncrustify_mode=`git config hooks.uncrustifymode`
copyright_mode=`git config hooks.copyrightmode`
if [ -z "$uncrustify_mode" ]
then
    uncrustify_mode=off
fi
if [ -z "$copyright_mode" ]
then
    copyright_mode=off
fi

if [[ -f admin/uncrustify.sh && \
      ( "$uncrustify_mode" != "off" || "$copyright_mode" != "off" ) ]]
then
    if [ "$uncrustify_mode" != "off" ]
    then
        uncrustify_path=`git config hooks.uncrustifypath`
        if [ -z "$uncrustify_path" ]
        then
            echo "Please set the path to uncrustify using 'git config hooks.uncrustifypath'."
            echo "Note that you need a custom version of uncrustify."
            exit 1
        fi
        export UNCRUSTIFY="$uncrustify_path"
    fi
    admin/uncrustify.sh check-index --rev=$against \
        --uncrustify="$uncrustify_mode" --copyright="$copyright_mode"
    stat=$?
    if [ $stat -eq 1 ] ; then
        exit 1
    elif [ $stat -ne 0 ] ; then
        echo "Source code formatting check failed"
        exit 1
    fi
fi