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#!/bin/sh
#
#
#  dropnroll
#
#  Copyright (C) 2009-2015 Christian Pointner <equinox@spreadspace.org>
#
#  This file is part of dropnroll.
#
#  dropnroll is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  any later version.
#
#  dropnroll 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 dropnroll. If not, see <http://www.gnu.org/licenses/>.
#

TARGET=`uname -s`
EBUILD_COMPAT=0

USE_CLANG=0

PREFIX='/usr/local'
BINDIR=''
ETCDIR=''
SYSTEMDDIR=''
INSTALLSYSTEMD=1
MANDIR=''
INSTALLMANPAGE=1
EXAMPLESDIR=''
INSTALLEXAMPLES=1

print_usage() {
  echo "configure --help                    print this"
  echo "          --target=<TARGET>         build target i.e. Linux (default: autodetect)"
  echo "          --prefix=<PREFIX>         the installation prefix (default: /usr/local)"
  echo "          --bindir=<DIR>            the path to the bin directory (default: $PREFIX/bin)"
  echo "          --sysconfdir=<DIR>        the path to the system configuration directory (default: $PREFIX/etc"
  echo "          --systemddir=<DIR>        the path to the systemd service unit directory (default: /usr/lib/systemd/system)"
  echo "          --no-systemd              dont't install systemd service unit"
  echo "          --mandir=<DIR>            the path to the system man pages (default: $PREFIX/share/man)"
  echo "          --no-manpage              dont't install manpage"
  echo "          --examplesdir=<DIR>       the path to the examples files (default: $PREFIX/share/examples)"
  echo "          --no-examples             dont't install example files"
  echo "          --use-clang               use clang/llvm as compiler/linker"
}

for arg
do
  case $arg in
  --target=*)
    TARGET=${arg#--target=}
  ;;
  --use-clang)
    USE_CLANG=1
  ;;
  --prefix=*)
    PREFIX=${arg#--prefix=}
  ;;
  --bindir=*)
    BINDIR=${arg#--bindir=}
  ;;
  --sysconfdir=*)
    ETCDIR=${arg#--sysconfdir=}
  ;;
  --systemddir=*)
    SYSTEMDDIR=${arg#--systemddir=}
  ;;
  --no-systemd)
    INSTALLSYSTEMD=0
  ;;
  --mandir=*)
    MANDIR=${arg#--mandir=}
  ;;
  --no-manpage)
    INSTALLMANPAGE=0
  ;;
  --examplesdir=*)
    EXAMPLESDIR=${arg#--examplesdir=}
  ;;
  --no-examples)
    INSTALLEXAMPLES=0
  ;;
  --ebuild-compat)
    EBUILD_COMPAT=1
  ;;
  --help)
    print_usage
    exit 0
  ;;
  *)
    ERRORS="$ERRORS $arg"
  ;;
  esac
done

if [ -n "$ERRORS" ] && [ $EBUILD_COMPAT -ne 1 ]; then
  for error in $ERRORS; do
    echo "Unknown argument: $error"
  done

  print_usage
  exit 1
fi

if [ $USE_CLANG -eq 0 ]; then
  CFLAGS='-g -Wall -O2'
  LDFLAGS='-g -Wall -O2'
  COMPILER='gcc'
else
  CFLAGS='-g -O2'
  LDFLAGS='-g -O2'
  COMPILER='clang'
fi

LDFLAGS=$LDFLAGS' -lrt'

rm -f version.h
rm -f include.mk
case $TARGET in
  Linux)
    echo "Linux specific build options"
  ;;
  OpenBSD|FreeBSD|NetBSD)
    echo "BSD specific build options"
    CFLAGS=$CFLAGS' -I/usr/local/include'
    LDFLAGS=$LDFLAGS' -L/usr/local/lib'
  ;;
  *)
    echo "platform not supported"
    exit 1;
  ;;
esac

if [ -z "$BINDIR" ]; then
  BINDIR=$PREFIX/bin
fi

if [ -z "$SYSTEMDDIR" ]; then
  SYSTEMDDIR=/usr/lib/systemd/system
fi

if [ -z "$ETCDIR" ]; then
  ETCDIR=$PREFIX/etc
fi

if [ -z "$MANDIR" ]; then
  MANDIR=$PREFIX/share/man
fi

if [ -z "$EXAMPLESDIR" ]; then
  EXAMPLESDIR=$PREFIX/share/examples
fi

cat > include.mk <<EOF
# this file was created automatically
# do not edit this file directly
# use ./configure instead

TARGET := $TARGET
CC := $COMPILER
CFLAGS := $CFLAGS
LDFLAGS := $LDFLAGS
INSTALL := install

prefix := $PREFIX
BINDIR := $BINDIR
ETCDIR := $ETCDIR
EOF

if [ $INSTALLSYSTEMD -eq 1 ]; then
  echo "SYSTEMDDIR := $SYSTEMDDIR" >> include.mk
  echo "installing systemd service unit"
else
  echo "not installing system service unit"
fi

if [ $INSTALLMANPAGE -eq 1 ]; then
  echo "MANDIR := $MANDIR" >> include.mk
  echo "installing manpage"
else
  echo "not installing manpage"
fi

if [ $INSTALLEXAMPLES -eq 1 ]; then
  echo "EXAMPLESDIR := $EXAMPLESDIR" >> include.mk
  echo "installing example files"
else
  echo "not installing example files"
fi

exit 0