#!/bin/sh
# ----------------------------------------------------------------------------
# - afnix-query                                                              -
# - afnix default option query system                                        -
# ----------------------------------------------------------------------------
# - This program is  free software;  you can  redistribute it and/or  modify -
# - it provided that this copyright notice is kept intact.                   -
# -                                                                          -
# - 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. In not event shall -
# - the copyright holder be  liable for  any direct, indirect, incidental or -
# - special damages arising in any way out of the use of this software.      -
# ----------------------------------------------------------------------------
# - copyright (c) 1999-2007 amaury darsch                                    -
# ----------------------------------------------------------------------------

# the program name
progname=$0
# the value to query
queryval=$1
# default value to return
retrnval=
# the directory list to search
dirslist=
# the platform to search
platname=

# ----------------------------------------------------------------------------
# - local function always make life easier                                   -
# ----------------------------------------------------------------------------

# print a usage message
usage () {
    echo "usage: afnix-query [options] name"
    echo "       -h                 print this help message"
    echo
    echo "       --default=value    set the default value"
    echo "       --dirlist=dir      set the directory list"
    exit 0
}

# print an error message
error () {
    echo "error: $1"
    exit 1
}

# get the deault value
getdef () {
    # update the platform name by calling afnix-guess
    guess=`dirname $progname`/afnix-guess
    platname=`$guess -n`
    if test "$?" != "0"; then
       echo $platname
       exit 1
    fi

    # update the platform directory list
    defltdir=`dirname $progname`/../def
    dirslist="~/.afnix /usr/local/etc/afnix /etc/afnix $defltdir"
}

# query the value in the directory list
query () {
    for d in $dirslist; do
        dfile=$d/afnix-${platname}.def
	if test -f "$dfile"; then
	    value=`grep "^$queryval" $dfile`
	    if test "$?" = "0"; then
		echo $value | awk '{print $2}'
		exit 0
	    fi
	fi
    done
}

# get the default value
getdef

# ----------------------------------------------------------------------------
# - parse options - this is where we really start                            -
# ----------------------------------------------------------------------------

lastopt=
for nextopt
do
    # assign the previous option argument
    if test -n "$lastopt"; then
	eval "$lastopt=\$nextopt"
	lastopt=
	continue
    fi

    # extract options
    case "$nextopt" in
    -*=*) argsopt=`echo "$nextopt" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
    *) argsopt= ;;
    esac

    # process options now
    case "$nextopt" in
    -h | --help)             usage ;;

    --default)                lastopt=prefix ;;
    --default=*)              retrnval="$argsopt" ;;

    --dirlist)                lastopt=prefix ;;
    --dirlist=*)              dirslist="$argsopt" ;;

    -*)                      error "illegal option $nextopt" ;;
     *)                      queryval="$nextopt" ;;
    esac
done

# check for query value
if test -z "$queryval" ; then
  error "missing query value"
fi

# query the value
query
if test -z "$retrnval"; then
    error "cannot query value"
fi

# return the default value
echo $retrnval
exit 0