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#! /bin/sh

# paperconfig: configuration of system paper name
#
# Copyright (C) 1996, Yves Arrouye <arrouye@debian.org>
#               2001, Adrian Bunk  <bunk@fs.tum.de>

usage() {
    if [ "$1" = -h ]
    then
	exec 1>&2
	echo -n U
    else
	echo -n u
    fi

    echo "sage: `basename $0` [ -v, --version ] [ -h, --help ] [ -p, --paper name | --force ]"

    if [ "$1" = -h ]
    then
	cat <<EOF

Options: -v, --verbose          print version information and exit
         -h, --help             print this help and exit
	 -p, --paper name	specify the paper to use
         --force                force paper configuration
EOF
	exit 0
    else
	exit 1
    fi
}

# "|| true" added below, to assure that the script does not fail even if
# called with bash -e. (MP 22/08/98)

unset PAPERSIZE || true 
: ${PAPERCONF:=/etc/papersize}
export PAPERCONF

unset PAPERDIR || true 
: ${PAPERDIR:=/etc/libpaper.d}
export PAPERDIR

force=0

if [ "$#" -eq 0 ]
  then
    usage
fi

while [ $# -ne 0 ]
do
    case "$1" in
	-v|--version)
	    echo "`basename $0` version 1.0" \
		"by Yves Arrouye <arrouye@debian.org>"
	    exit 0
	    ;;
	-h|--help)
	    usage -h
	    ;;
	-p|--paper)
	    test $# -gt 1 || usage
	    paper="$2"
	    shift
	    ;;
	--force)
	    force=1
	    ;;
	*)
	    usage
	    ;;
    esac
    shift
done

invalidpaper() {
    ! paperconf "$1" 2>/dev/null 1>&2
}

format() {
    _maxwidth=$1; shift
    _start="$1"; shift

    _cline=

    for w
    do
	if [ `echo "$_start$_cline$w " | wc -c` -ge 0$_maxwidth ]
	then
	    echo "$_cline"
	    _cline=
	    _start=
	fi
	_cline="$_cline$w "
    done

    if [ -n "$_cline" ]
    then
	echo "$_cline"
    fi

    unset _maxwidth _cline _start
}

# "chmod 644" added below, to assure that the conf file is created
# with the right access permissions (MP 13/05/2000)

setpaper() {
    paperright=`paperconf "$1" 2>/dev/null`

    ok=0

    if 2>/dev/null echo "$paperright" >${PAPERCONF}.new
    then
        if 2>/dev/null mv -f ${PAPERCONF}.new $PAPERCONF
	then
	    if 2>/dev/null chmod 644 $PAPERCONF
	    then
		ok=1
            fi
        fi
    fi

    if [ $ok -eq 0 ]
    then
        echo `basename $0`: cannot create $PAPERCONF
        exit 2
    else
	#
	# Added code for calling back applications when
	# papersize changes. See bug #345466
	# eppesuig@debian.org, 2006-01-05
	if [ -d ${PAPERDIR} ]
	then
	    run-parts ${PAPERDIR}
	fi
    fi
}

if [ ! -z "$paper" ]
then
    if invalidpaper $paper
    then
	>&2 echo `basename $0`: \"$paper\" is not a known paper name
	exit 3
    fi
    setpaper "$paper"
    exit 0
fi

knownpapers="`paperconf -a`"

prompt=
width=72

# "|| true" added below, to assure that the script does not fail even if 
# called with bash -e. (MP 22/08/98)

paper=`paperconf 2>/dev/null || true`
dftpaper=`paperconf -d`

if [ $force -eq 1 ] || [ ! -e $PAPERCONF ] || invalidpaper $paper
then
    papers="`format $width \"\" $knownpapers`"
    echo

    if [ -x /usr/bin/pager ]
    then
	: ${PAGER:=/usr/bin/pager}
    fi
    if [ -x /bin/more ]
    then
	: ${PAGER:=/bin/more}
    fi
    : ${PAGER:=cat}

    LESS="-X -E $LESS"
    export LESS

    (
	cat <<EOF
The default (also known as system) paper can be chosen from many known
papers that are currently recognized by programs using the libpaper
library (with libpaper, paper names are case insensitive; if you use
programs that use the system paper size but do not rely on the libpaper
library, this may not be true and some of the papers listed below may
not be known by these programs):

EOF
	echo "$papers" | sed 's/^/    /'
	echo
    ) | ${PAGER}

    : ${paper:=$dftpaper}

    echo -n "Default paper name? [$paper] "
    read ans
    : ${ans:=$paper}
    paper=$ans
fi

while invalidpaper "$paper"
do
    if [ -z "$paper" ]
    then
	echo "Please choose a paper from the available papers list."
    else
	echo "Unknow paper \"$paper\"," \
	    "please choose one from the available papers list."
    fi

    paper=$dftpaper

    echo -n "Default paper name? [$paper] "
    read ans
    paper=$ans
done

if [ "`paperconf 2>/dev/null`" != "$paper" ] || grep -q "[# 	]" $PAPERCONF
then
    setpaper "$paper"
fi

exit 0