#!/bin/sh

#
# Copyright (C) 2017 Canonical Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3 as
# published by the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

SETUP=false
CLEAN=false
NUM_JOBS=$(( `grep -c ^processor /proc/cpuinfo` + 1 ))
CODE_DIR=$( dirname `readlink -f $0` )

usage() {
    echo "usage: build [OPTIONS] [BUILD_TYPE]\n" >&2
    echo "Script to build the shell. If BUILD_TYPE is not specified, it defaults to \"debug\".\n" >&2
    echo "OPTIONS:" >&2
    echo " -c, --clean Clean the build tree before building" >&2
    echo >&2
    exit 1
}

ARGS=`getopt -n$0 -u -a --longoptions="setup,clean,help" -o "sch" -- "$@"`
[ $? -ne 0 ] && usage
eval set -- "$ARGS"

while [ $# -gt 0 ]
do
    case "$1" in
       -c|--clean)   CLEAN=true;;
       -h|--help)    usage;;
       --)           shift;break;;
    esac
    shift
done

[ $# -gt 1 ] && usage

BUILD_TYPE="debug"
[ $# -eq 1 ] && BUILD_TYPE="$1"

mk_build_deps() {
    if [ ! -f control -o $CODE_DIR/debian/control -nt control ]; then
        sed 's/\:native//g' $CODE_DIR/debian/control > control
        mk-build-deps --install --root-cmd sudo control
    fi
}

if [ -f "/usr/bin/ccache" ] ; then
  if [ "x$CC" = "x" ]; then
    export CC='ccache gcc'
  fi
  if [ "x$CXX" = "x" ] ; then
    export CXX='ccache g++'
  fi
fi

if [ -f "/usr/bin/ninja" ] ; then
  GENERATOR="-G Ninja"
  # Ninja does not need -j, it parallelizes automatically.
  BUILD_COMMAND="ninja"
else
  GENERATOR=
  BUILD_COMMAND="make -j$NUM_JOBS"
fi

if $CLEAN; then rm -rf builddir; fi
mkdir -p builddir
cd builddir
mk_build_deps
cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE $CODE_DIR ${GENERATOR} || exit 6
${BUILD_COMMAND} || exit 7