configure

#!/bin/sh

arg() {
  local a n s r
  s="$1"
  r="$2"
  shift 2
  for a in "$@"; do
    n="${a%%=*}"
    [ "$n" = "--$s" ] && r="${a#*=}"
  done
  echo "$r"
}

enable() {
  local a n s r
  s="$1"
  r=false
  shift
  for a in "$@"; do
    n="${a#--enable-}"
    [ "$n" = "$s" ] && r=true
    n="${a#--disable-}"
    [ "$n" = "$s" ] && r=false
  done
  echo "$r"
}

pkgconfig="`arg pkgconfig pkg-config "$@"`"
bindir="`arg bindir /usr/bin "$@"`"
sysconfdir="`arg sysconfdir /etc "$@"`"
runstatedir="`arg runstatedir /run "$@"`"

enable_systemd="`enable systemd false "$@"`"
enable_elogind="`enable elogind false "$@"`"
enable_openrc="`enable openrc false "$@"`"

unitdir=
"$enable_systemd" && {
  unitdir="`arg unitdir '' "$@"`"
  [ -z "$unitdir" ] && unitdir="`"$pkgconfig" systemd --variable=systemdsystemunitdir`"
  [ -z "$unitdir" ] && {
    echo 'Failed to configure unitdir'
    exit 1
  }
}

eloginddir=
"$enable_elogind" && {
  eloginddir="`arg eloginddir '' "$@"`"
  [ -z "$eloginddir" ] && eloginddir="`"$pkgconfig" libelogind --variable=libdir`"
  [ -z "$eloginddir" ] && {
    echo 'Failed to configure eloginddir'
    exit 1
  }
}

sedcond() {
  local v
  "$2" && v=1
  printf '%s' "s,^\(ENABLE_$1 =\).*$,\1 $v,"
}

sedarg() {
  printf '%s' "s,^\($1 =\).*$,\1 $2,"
}

sed Makefile.in \
-e "`sedcond SYSTEMD "$enable_systemd"`" \
-e "`sedcond ELOGIND "$enable_elogind"`" \
-e "`sedcond OPENRC "$enable_openrc"`" \
-e "`sedarg BINDIR "$bindir"`" \
-e "`sedarg SYSCONFDIR "$sysconfdir"`" \
-e "`sedarg RUNSTATEDIR "$runstatedir"`" \
-e "`sedarg UNITDIR "$unitdir"`" \
-e "`sedarg ELOGINDDIR "$eloginddir"`" \
> Makefile || exit 1

echo "Enable systemd: $enable_systemd"
echo "Enable elogind: $enable_elogind"
echo "Enable OpenRC: $enable_openrc"
echo
echo "bindir: $bindir"
echo "sysconfdir: $sysconfdir"
"$enable_openrc" &&
echo "runstatedir: $runstatedir"
"$enable_systemd" &&
echo "unitdir: $unitdir"
"$enable_elogind" &&
echo "eloginddir: $eloginddir"
echo