configure

#!/bin/sh

usage() {
    cat <<EOF
usage: ./configure [OPTION...]

Defaults are in brackets.

 --prefix=PREFIX                Use PREFIX as main prefix [/]
 --securedir=DIR                Use DIR as path to install to [PREFIX/lib/security]

 --with-parentdir=DIR           Set DIR as parent directory for runtime dirs [/run/users]
 --with-varname=NAME            Set NAME as variable name in the environment [XDG_RUNTIME_DIR]
EOF
    exit $1
}

prefix=/
securedir=
parentdir=/run/users
varname=XDG_RUNTIME_DIR

cmdline="$0 $@"
while [ $# -ge 1 ]; do
    opt=${1%%=*}
    val=${1#*=}
    case "$opt" in
        "--prefix")
            prefix="$val"
            ;;
        "--securedir")
            securedir="$val"
            ;;
        "--with-parentdir")
            parentdir="$val"
            ;;
        "--with-varname")
            varname="$val"
            ;;
        "-h"|"--help")
            usage 0
            ;;
        *)
            echo "invalid option: $opt"
            usage 1
            ;;
    esac
    shift
done

prefix=${prefix%/}

if [ -z "$securedir" ]; then
    securedir="$prefix/lib/security"
fi

exec 4>&1 1>config.mak
cat <<EOF
# This file was generated with: $cmdline
# Do not edit manually.

securedir := $securedir
EOF
exec 1>&4 4<&-

exec 4>&1 1>config.h
cat <<EOF
/* This file was generated with: $cmdline */
/* Do not edit manually. */

/* name of variable to set in environment */
#define VAR_NAME            "$varname"

/* parent dir for runtime dirs */
#define PARENT_DIR          "$parentdir"

EOF
exec 1>&4 4<&-

cat <<EOF
    Parent dir of runtime dirs          $parentdir
    Variable to set in environment      $varname

    Install module to:                  $securedir
EOF