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#!/bin/bash
shopt -s extglob
shopt -s lastpipe

VERSION="1.30"
VDATE="2015/10/06"
## see release notes at the end of this file.

: ${GS=`which gs`}
if [ ! $? ]; then
    echo "ghostscript not found; aborting.";
    exit 1;
fi
: ${PDFLATEX=`which pdflatex`}
if [ ! $? ]; then
    echo "pdflatex not found; aborting.";
    exit 1;
fi

declare -A BB NOBB;

function defaultvalues()
{
  : ${dfpdfxupCOLS=2}
  : ${dfpdfxupROWS=1}
  : ${dfpdfxupLANDSC=1}
  : ${dfpdfxupPAP="a4"}
  : ${dfpdfxupBOOKLET=0}
  : ${dfpdfxupOUTF="pdfxup.pdf"}
  : ${dfpdfxupIHM="5pt"}
  : ${dfpdfxupIVM="5pt"}
  : ${dfpdfxupIM="5pt"}
  : ${dfpdfxupHM="5pt"}
  : ${dfpdfxupVM="5pt"}
  : ${dfpdfxupM="5pt"}
  : ${dfpdfxupIHS="1pt"}
  : ${dfpdfxupIVS="1pt"}
  : ${dfpdfxupIS="1pt"}
  : ${dfpdfxupFW=".4pt"}
  : ${dfpdfxupPAGES="-"}
  : ${dfpdfxupBB="-"}
  : ${dfpdfxupGBB="0"}
  : ${dfpdfxupVERB=1}
  : ${dfpdfxupDEBUG=0}
}
function usage()
{
defaultvalues;
echo "pdfxup: n-up pages of a PDF document, preserving readability
usage:  `basename $0` [OPTIONS] file
Available OPTIONS are:
  -x n           n columns per page                    [default: \"$dfpdfxupCOLS\"]
  -y n           n lines per page                      [default: \"$dfpdfxupROWS\"]
  -l [0|1]       landscape-mode                        [default: \"$dfpdfxupLANDSC\"]
  -b [0|1|le|se] booklet-mode                          [default: \"$dfpdfxupBOOKLET\"]
  -im n          inner margins                         [default: \"$dfpdfxupIM\"]
  -m n           margins                               [default: \"$dfpdfxupM\"]
  -is n          interm. spaces                        [default: \"$dfpdfxupIS\"]
  -fw n          frame width                           [default: \"$dfpdfxupFW\"] 
  -o file        write output to file                  [default: \"$dfpdfxupOUTF\"]
  -p range       restrict to range of pages            [default: \"$dfpdfxupPAGES\"]
  -nobb range    page range to omit for computing bbox [default: \"$dfpdfxupNOBB\"]
  -bb range      page range to use for computing bbox  [default: \"$dfpdfxupBB\"]
  -g [0|1]       only computes bounding box            [default: \"$dfpdfxupGBB\"]
  -s x y X Y     force bounding box                    [default: unset]
  -V [0-3]       select verbosity                      [default: \"$dfpdfxupVERB\"]
  -q             run quietly (equiv. '-V=0')
  -i             ask before overwriting/removing files
  -d             debug mode: keep intermediary files
  -v             show version number and exit
  -h             show this help message";

##
## Some options are not presented, for the sake of brevity...
##
##  -ihm n         inner horizontal margin               [default: \"$dfpdfxupIHM\"]
##  -ivm n         inner vertical margin                 [default: \"$dfpdfxupIVM\"]
##  -hm n          horizontal margin                     [default: \"$dfpdfxupHM\"]
##  -vm n          vertical margin                       [default: \"$dfpdfxupVM\"]
##  -ihs n         interm. horizontal space              [detault: \"$dfpdfxupIHS\"]
##  -ivs n         interm. vertical space                [detault: \"$dfpdfxupIVS\"]
##  -ps s          output paper size                     [default: \"$dfpdfxupPAP\"]
##
##
##

exit 0;
}

function setdefaultvalues()
{
  COLS=$dfpdfxupCOLS;
  ROWS=$dfpdfxupROWS;
  LANDSC=$dfpdfxupLANDSC;
  BOOKLET=$dfpdfxupBOOKLET;
  PAP=$dfpdfxupPAP;
  OUTF=$dfpdfxupOUTF
  IHM=$dfpdfxupIHM;
  IVM=$dfpdfxupIVM;
  IM=$dfpdfxupIM;
  HM=$dfpdfxupHM;
  VM=$dfpdfxupVM;
  M=$dfpdfxupM;
  IHS=$dfpdfxupIHS;
  IVS=$dfpdfxupIVS;
  IS=$dfpdfxupIS;
  FW=$dfpdfxupFW;
  VERB=$dfpdfxupVERB;
  DEBUG=$dfpdfxupDEBUG;
  nbNOBB=0;
  nbBB=0;
  GBB=$dfpdfxupGBB;
  SBB=0;
  x0=-1
  y0=-1
  h0=-1
  w0=-1
  ## the names for h and w should actually be X and Y: they are not width and height, 
  ## but coordinates of upper right corner.
}

function dimtopt()
{
    dim=$1;
    case $dim in
	*pt)
	    ;;
	*mm)
	    dim=${dim%mm};
	    eval dim=$((dim*2845/100))pt;
	    ;;
	*cm)
	    dim=${dim%cm};
	    eval dim=$((dim*284/10))pt;
	    ;;
	*in)
	    dim=${dim%in};
	    eval dim=$((dim*723/10))pt;
	    ;;
	*[!0-9]*)
	    ## should not occur... has been filtered out by main 'case'
	    echo "Illegal unit of measure in option '$3'; ignoring"; 
	    dim=$2;
	    ;;
	*)
	    dim=${dim}pt;
	    ;;
    esac
}

function testdim()
{
    dim=$1;
    case $dim in
	+([0-9])@(pt|in|cm|mm))
	    ;;
	+([0-9]))
	    dim=${dim}pt
	    ;;
	+([0-9])*)
	    echo "Illegal unit of measure in option '$3'; ignoring";
	    dim=$2;
	    ;;
	*)
	    echo "Not a valid dimension in option '$3'; ignoring";
	    dim=$2;
	    ;;
    esac
}

function testrange()
{
    declare -a list=("${!2}");

    in=0;
    if [[ $3 -eq 0 ]]; then 
	return;
    fi
    n=$1;
    l=$3
    i=0;
    while ( true ); do
	if [[ $i -ge $l ]]; then break; fi
	case ${list[$i]} in
	    +([0-9]))
                 first=${list[$i]};
                 last=${list[$i]};
		 shift;;
	    -+([0-9]))
                 first=1;
		 last=${list[$i]:1};
		 shift;;
            +([0-9])-)
                 first=${list[$i]::-1};
	         last=$nbp;
	         shift;;
            +([0-9])-+([0-9]))
                 first=${list[$i]%-*}
		 last=${list[$i]#*-}
		 shift;;
	esac
	if [[ $n -ge $first && $n -le $last ]]; then
	    in=1;
	    return;
	fi
	eval i=$(( i+1 ))
    done
}

function myecho()
{
    ECHO=0;
    case $1 in
	+([0-9])\+)
            if [[ $VERB -ge ${1%+} ]]; then ECHO=1; fi;;
	+([0-9]))
            if [[ $VERB -eq $1 ]]; then ECHO=1; fi;;
	+([0-9])-)
            if [[ $VERB -le ${1%-} ]]; then ECHO=1; fi;;
    esac
    if [[ $ECHO == 1 ]]; then
	case $2 in
	    -*)
		echo $2 "$3";;
	    *)
		echo "$2";;
	esac
    fi
}

ARGS=$@;
if [ $# -eq 0 ]; then
  usage;
fi

defaultvalues;
setdefaultvalues;
filename="temp-pdfxup-`date +%s`";

while [ $# != 0 ]; do
    case $1 in
	-x|--columns)
	    COLS=$2;
	    shift 2;;
	-x?(=)+([0-9]))
	    COLS=`echo $1|sed -re "s/-x=?//"`;
	    shift;;
	-y|--rows)
	    ROWS=$2;
	    shift 2;;
	-y?(=)+([0-9]))
	    ROWS=`echo $1|sed -re "s/-y=?//"`;
	    shift;;
	-l|--landscape)
	    case $2 in
		0|1)
		    LANDSC=$2;
		    SHIFT=2;
		    ;;
		yes|y)
		    LANDSC=1;
		    SHIFT=2;
		    ;;
		no|n)
		    LANDSC=0;
		    SHIFT=2;
		    ;;
		-*)
		    LANDSC=1;
		    SHIFT=1;
		    ;;
		*)
		    LANDSC=1;
		    #echo "Normal use of '$1' option is: '$1 [0|1]'";
		    #echo "Assuming you want landscape outupt...";
		    SHIFT=1;
	    esac
	    shift $SHIFT;;
	-l*)
	    ANS=`echo $1|sed -re "s/-l=?//"`;
	    case $ANS in
		0|1)
		    LANDSC=$ANS;
		    ;;
		yes|y)
		    LANDSC=1;
		    ;;
		no|n)
		    LANDSC=0;
		    ;;
		*)
		    LANDSC=1;
		    #echo "Normal use of '$1' option is: '$1 [0|1]'";
		    #echo "Assuming you want landscape outupt...";
	    esac
	    shift;;
	-nl|--portrait|--no-landscape|--nolandscape)
	    LANDSC=0;
	    shift;;
	-b|--booklet)
	    case $2 in
		0|1|le|se)
		    BOOKLET=$2;
		    SHIFT=2;
		    ;;
		yes|y)
		    BOOKLET=1;
		    SHIFT=2;
		    ;;
		no|n)
		    BOOKLET=0;
		    SHIFT=2;
		    ;;
		-*)
		    BOOKLET=1;
		    SHIFT=1;
		    ;;
		*)
		    BOOKLET=1;
		    #echo "Normal use of '$1' option is: '$1 [0|1]'";
		    #echo "Assuming you want booklet outupt...";
		    SHIFT=1;
	    esac
	    if [[ $BOOKLET != 0 ]]; then
		FW=0pt
	    fi
	    shift $SHIFT;;
	-b[^b]*)
	    ANS=`echo $1|sed -re "s/-b=?//"`;
	    case $ANS in
		0|1|le|se)
		    BOOKLET=$ANS;
		    ;;
		yes|y)
		    BOOKLET=1;
		    ;;
		no|n)
		    BOOKLET=0;
		    ;;
		*)
		    BOOKLET=1;
		    #echo "Normal use of '$1' option is: '$1 [0|1]'";
		    #echo "Assuming you want booklet outupt...";
	    esac
	    if [[ $BOOKLET != 0 ]]; then
		FW=0pt
	    fi
	    shift;;
	-ps|--paper|--paper-size)
	    PAP=$2;
	    shift 2;;
	-ps=*|--paper=*|--paper-size=*)
	    ## '=' is compulsory, as we expect a string...
	    ANS=`echo $1|sed -re "s/(-ps=|--paper=|--paper-size=)//"`;
	    PAP=$ANS;
	    shift;;
	-p|--pages|--page)
	    PAGES=$2;
	    shift 2;;
	-p*|--page*)
	    ANS=`echo $1|sed -re "s/(-p|--pages?)=?//"`;
	    PAGES=$ANS;
	    shift 2;;
	-o|--out|--output-file|--outfile)
	    OUTF=$2;
	    shift 2;;
	-o*)
	    ANS=`echo $1|sed -re "s/-o=?//"`;
	    OUTF=$ANS;
	    shift;;
	-ihm|--innerhmargin)
	    dimtopt $2 $dfpdfxupIHM "$1 $2";
	    IHM=$dim;
	    shift 2;;
	-ihm?(=)+([0-9])*)
	    ANS=`echo $1|sed -re "s/-ihm=?//"`;
	    dimtopt $ANS $dfpdfxupIHM $1;
	    IHM=$dim;
	    shift;;
	-ivm|--innervmargin)
	    dimtopt $2 $dfpdfxupIVM "$1 $2";
	    IVM=$dim;
	    shift 2;;
	-ivm?(=)+([0-9])*)
	    ANS=`echo $1|sed -re "s/-ivm=?//"`;
	    dimtopt $ANS $dfpdfxupIVM $1;
	    IVM=$dim;
	    shift;;
	-im|--innermargins)
	    dimtopt $2 $dfpdfxupIM "$1 $2";
	    IHM=$dim;
	    IVM=$dim;
	    shift 2;;
	-im?(=)+([0-9])*)
	    ANS=`echo $1|sed -re "s/-im=?//"`;
	    dimtopt $ANS $dfpdfxupIM $1;
	    IHM=$dim;
	    IVM=$dim;
	    shift;;
	-hm|--hmargin)
	    testdim $2 $dfpdfxupHM "$1 $2";
	    HM=$dim;
	    shift 2;;
	-hm?(=)+([0-9])*)
	    ANS=`echo $1|sed -re "s/-hm=?//"`;
	    testdim $ANS $dfpdfxupHM $1;
	    HM=$dim;
	    shift;;
	-vm|--vmargin)
	    testdim $2 $dfpdfxupVM "$1 $2";
	    VM=$dim;
	    shift 2;;
	-vm?(=)+([0-9])*)
	    ANS=`echo $1|sed -re "s/-vm=?//"`;
	    testdim $ANS $dfpdfxupVM $1;
	    VM=$dim;
	    shift;;
	-m|--margins)
	    testdim $2 $dfpdfxupM "$1 $2";
	    HM=$dim;
	    VM=$dim;
	    shift 2;;
	-m?(=)+([0-9])*)
	    ANS=`echo $1|sed -re "s/-m=?//"`;
	    testdim $ANS $dfpdfxupM $1;
	    HM=$dim;
	    VM=$dim;
	    shift;;
	-ihs|--inthspace)
	    testdim $2 $dfpdfxupIHS "$1 $2";
	    IHS=$dim;
	    shift 2;;
	-ihs?(=)+([0-9])*)
	    ANS=`echo $1|sed -re "s/-ihs=?//"`;
	    testdim $ANS $dfpdfxupIHS $1;
	    IHS=$dim;
	    shift;;
	-ivs|--intvspace)
	    testdim $2 $dfpdfxupIVS "$1 $2";
	    IVS=$dim;
	    shift 2;;
	-ivs?(=)+([0-9])*)
	    ANS=`echo $1|sed -re "s/-ivs=?//"`;
	    testdim $ANS $dfpdfxupIVS $1;
	    IVS=$dim;
	    shift;;
	-is|--intspaces)
	    testdim $2 $dfpdfxupIS "$1 $2";
	    IHS=$dim;
	    IVS=$dim;
	    shift 2;;
	-is?(=)+([0-9])*)
	    ANS=`echo $1|sed -re "s/-is=?//"`;
	    testdim $ANS $dfpdfxupIS $1;
	    IHS=$dim;
	    IVS=$dim;
	    shift;;
	-fw|--framewidth)
	    testdim $2 $dfpdfxupFW "$1 $2";
	    FW=$dim;
	    shift 2;;
	-fw?(=)+([0-9])*)
	    ANS=`echo $1|sed -re "s/-fw=?//"`;
	    testdim $ANS $dfpdfxupFW $1;
	    FW=$dim;
	    shift;;
	-i)
	    MVopt="-i";
	    RMopt="-i";
	    shift;;
	-nobb|--nobb|-no-bb|--no-bb)
	    NOBB[$nbNOBB]=$2;
	    eval nbNOBB=$(( nbNOBB+1 ));
	    shift 2;;
	-nobb*|--nobb*|-no-bb*|--no-bb*)
	    ANS=`echo $1|sed -re "s/--?no-?bb=?//"`;
	    NOBB[$nbNOBB]=$ANS;
	    eval nbNOBB=$(( nbNOBB+1 ));
	    shift;;
	-bb|--bb)
	    BB[$nbBB]=$2;
	    eval nbBB=$(( nbBB+1 ));
	    shift 2;;
	-bb*|--bb*)
	    ANS=`echo $1|sed -re "s/--?bb=?//"`;
	    BB[$nbBB]=$ANS;
	    eval nbBB=$(( nbBB+1 ));
	    shift;;


	-g|--get-bb|--getbb)
	    case $2 in
		0|1)
		    GBB=$2;
		    SHIFT=2;
		    ;;
		yes|y)
		    GBB=1;
		    SHIFT=2;
		    ;;
		no|n)
		    GBB=0;
		    SHIFT=2;
		    ;;
		-*)
		    GBB=1;
		    SHIFT=1;
		    ;;
		*)
		    GBB=1;
		    #echo "Normal use of '$1' option is: '$1 [0|1]'";
		    #echo "Assuming you want landscape outupt...";
		    SHIFT=1;
	    esac
	    shift $SHIFT;;
	-g*)
	    ANS=`echo $1|sed -re "s/-g=?//"`;
	    case $ANS in
		0|1)
		    GBB=$ANS;
		    ;;
		yes|y)
		    GBB=1;
		    ;;
		no|n)
		    GBB=0;
		    ;;
		*)
		    GBB=1;
		    #echo "Normal use of '$1' option is: '$1 [0|1]'";
		    #echo "Assuming you want landscape outupt...";
	    esac
	    shift;;

	-s|--set-bb|--setbb)
	    case "$2$3$4$5" in
                +([0-9]))
		    SBB=1;
		    BBX=$2;
		    BBY=$3;
		    BBW=$4;
		    BBH=$5;;
	    esac
	    shift 5;;

	-V)
	    case $2 in
		@(0|1|2|3))
		    VERB=$2;
		    SHIFT=2;;
		*)
		    VERB=2;
		    SHIFT=1;;
	    esac
	    shift $SHIFT;;
	-V?(=)@(0|1|2|3))
	    VERB=`echo $1|sed -re "s/-V=?//"`;
	    shift;;
	-V?(=)+([0-9]))
	    VERB=9;
	    shift;;
	-VV)
	    VERB=2;
	    shift;;
	-VVV)
	    VERB=3;
	    shift;;
	-q|--quiet)
	    VERB=0;
	    shift;;
	-v|--version)
	    echo "pdfxup version $VERSION (released $VDATE)";
	    exit 0;;
	-d|--debug)
	    DEBUG=1;
	    shift;;
	-*)
	    usage;;
	*:[0-9\-]*)
	    ARG=$1;
	    file=${ARG%:*}
	    PAGES=${ARG#*:}
	    break;;
	*)
	    file=$1;
	    ## only one file is allowed, and no options
	    ## should appear after the file name...
	    break;;
    esac;
done

if [[ $file == "" ]]; then
    echo "pdfxup: no input file given; exiting.";
    exit 0;
fi

if [[ ! -e $file && `basename $file .pdf` == $file ]]; then
    myecho 2+ "-> changing file name '$file' to '$file.pdf'";
    file="$file.pdf";
fi;

if [[ ! -e $file ]]; then
    echo "pdfxup: file $file not found; exiting.";
    exit 0;
fi

## get number of pages
nbp=`$GS -sDEVICE=bbox -dNOPAUSE -dQUIET -c "($file) (r) file runpdfbegin pdfpagecount = quit"`

if [[ $BOOKLET != 0 ]]; then
  if [[ $COLS != 2 || $ROWS != 1 || $LANDSC == 0 ]]; then
      echo "forcing booklet mode: 2 cols, 1 row, landscape";
      COLS=2; ROWS=1; LANDSC=1;
  fi
fi

firstp=1;
lastp=$nbp;
if [[ $PAGES =~ ([0-9]+|[0-9]*-[0-9]*) ]]; then
    BB[$nbBB]=$PAGES;
    eval nbBB=$(( nbBB+1 ));
    case $PAGES in
	-)
	    firstp=1;
	    lastp=$nbp;;
	+([0-9]))
            firstp=${PAGES};
            lastp=${PAGES};;
	-+([0-9]))
            firstp=1;
	    lastp=${PAGES:1};;
      +([0-9])-)
            firstp=${PAGES::-1};
	    lastp=$nbp;;
      +([0-9])-+([0-9]))
            firstp=${PAGES%-*};
            lastp=${PAGES#*-};;
    esac
fi

if [[ $nbBB == 0 ]]; then
    BB[$nbBB]=$dfpdfxupBB;
    nbBB=1;
fi

if [[ $nbNOBB == 0 ]]; then
    NOBB[0]="";
fi



if [[ $SBB == 0 ]]; then
    myecho 1+ -n "-> computing bounding box";
    myecho 2+ "";
    
    x=$x0
    y=$y0
    w=$w0
    h=$h0
    curr=0
    page=0
    
# $GS -dNOPAUSE -dSAFER -dQUIET -dBATCH -sDEVICE=bbox $file 2>&1 |\
#   grep "%%BoundingBox" |\
#   sed "s/^.*Box: //" > $filename-bb.txt
# for i in `cat $filename-bb.txt`; do 
#     case $curr in
# 	0)
# 	    thisx=$i;
# 	    #if [[ $x -gt $i ]]; then x=$i; fi
# 	    ;;
# 	1)
# 	    thisy=$i;
# 	    #if [[ $y -gt $i ]]; then y=$i; fi
# 	    ;;
# 	2)
# 	    thisw=$i;
# 	    #if [[ $w -lt $i ]]; then w=$i; fi
# 	    ;;
# 	3)
# 	    thish=$i;
# 	    #if [[ $h -lt $i ]]; then h=$i; fi
# 	    if [[ $x -lt 0 || $x -gt $thisx && $thisx+$thisw -gt 0 ]]; then x=$thisx; fi
# 	    if [[ $y -lt 0 || $y -gt $thisy && $thisy+$thish -gt 0 ]]; then y=$thisy; fi
# 	    if [[ $w -lt 0 || $w -lt $thisw && $thisx+$thisw -gt 0 ]]; then w=$thisw; fi
# 	    if [[ $h -lt 0 || $h -lt $thish && $thisy+$thish -gt 0 ]]; then h=$thish; fi
# 	    ;;
#     esac
#     eval curr=$(( (curr+1) % 4 ));
# done
# rm $filename-bb.txt

    for (( b=0; b<$nbBB; b++ ))
    do 
	case ${BB[$b]} in
	    -)
		first=1;
		last=$nbp;;
	    +([0-9]))
                first=${BB[$b]};
                last=${BB[$b]};;
	    -+([0-9]))
                first=1;
	        last=${BB[$b]:1};;
	    +([0-9])-)
                first=${BB[$b]::-1};
	        last=$nbp;;
	    +([0-9])-+([0-9]))
                first=${BB[$b]%-*};
		last=${BB[$b]#*-};;
	esac
	myecho 3+ " > $GS -dNOPAUSE -dSAFER -dQUIET -dBATCH -dFirstPage=$first -dLastPage=$last -sDEVICE=bbox $file"
	$GS -dNOPAUSE -dSAFER -dQUIET -dBATCH -dFirstPage=$first -dLastPage=$last -sDEVICE=bbox $file 2>&1 | 
	while IFS= read -r line; do
	    bbox=`echo $line | grep "%%BoundingBox" | sed "s/^.*Box: //"`;
	    if [[ $bbox != "" ]]; then 
		for i in `echo $line | grep "%%BoundingBox" | sed "s/^.*Box: //"`; do
		    if [[ $curr == 0 ]]; then
			eval page=$(( page+1 ));
		    fi
		    case $curr in
 			0)
 			    thisx=$i;
 			    #if [[ $x -gt $i ]]; then x=$i; fi
 			    ;;
 			1)
 			    thisy=$i;
 			    #if [[ $y -gt $i ]]; then y=$i; fi
 			    ;;
 			2)
 			    thisw=$i;
 			    #if [[ $w -lt $i ]]; then w=$i; fi
 			    ;;
 			3)
 			    thish=$i;
 			    #if [[ $h -lt $i ]]; then h=$i; fi
			    testrange $page NOBB[@] $nbNOBB
			    if [ $in == 0 ]; then
 				if [[ $x -lt 0 || $x -gt $thisx && $thisx+$thisw -gt 0 ]]; then x=$thisx; fi
 				if [[ $y -lt 0 || $y -gt $thisy && $thisy+$thish -gt 0 ]]; then y=$thisy; fi
 				if [[ $w -lt 0 || $w -lt $thisw && $thisx+$thisw -gt 0 ]]; then w=$thisw; fi
 				if [[ $h -lt 0 || $h -lt $thish && $thisy+$thish -gt 0 ]]; then h=$thish; fi
				myecho 1 -n "."
				myecho 2 -ne "    bbox: x=$x y=$y X=$w Y=$h  (page $page)       \\r";
				myecho 3+    "    bbox: x=$x y=$y X=$w Y=$h  (page $page)       ";
			    fi
 			    ;;
		    esac
		    eval curr=$(( (curr+1) % 4 ));
		done
	    fi
	done;
    done;
else
    x=$BBX;
    y=$BBY;
    w=$BBW;
    h=$BBH;
fi


if [[ $x -eq $x0 &&
      $y -eq $y0 && 
      $h -eq $h0 && 
      $w -eq $w0 ]]; then 
    echo "empty bounding box; aborting."
    exit 1;
fi

if [[ $SBB == 0 ]]; then
    myecho 1 -n "."
    myecho 2+ -ne "    bbox: x=$x y=$y X=$w Y=$h  (final)              \\r";
    
    myecho 1+ "";
fi

if [[ $GBB != 0 ]]; then
    myecho 1 "-> final bounding box: x=$x y=$y X=$w Y=$h";
    exit 0;
fi


IHM=${IHM%pt};
IVM=${IVM%pt};
eval x=$((x-IHM))
eval y=$((y-IVM))
eval w=$((w+IHM))
eval h=$((h+IVM))



cat > $filename.tex <<EOF
  \newif\ifbooklet
  \newif\iflongedge
EOF
case $BOOKLET in
    0)
	echo "  \bookletfalse" >> $filename.tex;;
    se)
	echo "  \booklettrue" >> $filename.tex
	echo "  \longedgefalse" >> $filename.tex;;
    *)
	echo "  \booklettrue" >> $filename.tex
	echo "  \longedgetrue" >> $filename.tex;;
esac

cat >> $filename.tex <<EOF
  \documentclass{article}
  \usepackage[margin=0pt]{geometry}
  \usepackage{graphicx}
  \IfFileExists{grffile.sty}{\usepackage{grffile}}{}
  \topskip=0pt

  \def\file{$file}
  \pdfximage{\file}
  \parindent=0pt

  \def\outputpaper{$PAP}
  \def\outputlandscape{$LANDSC}
  \def\nbhoriz{$COLS}
  \def\nbvert{$ROWS}

  \expandafter\geometry\expandafter{\outputpaper paper}
  \ifnum\outputlandscape=1\relax\geometry{landscape}\fi

  \newcounter{outpage}
  \newcounter{lastpage}
  %\setcounter{outpage}{\the\pdflastximagepages}
  \setcounter{outpage}{$lastp}
  \makeatletter
  \addtocounter{outpage}{-1}
  \divide\c@outpage by \nbhoriz
  \divide\c@outpage by \nbvert
  \ifbooklet
    \divide\c@outpage by 2
  \fi
  \stepcounter{outpage}
  \ifbooklet
    \multiply\c@outpage by 2
  \fi
  \setcounter{lastpage}{\value{outpage}}
  \multiply\c@lastpage by \nbhoriz
  \multiply\c@lastpage by \nbvert
  %\showthe\c@outpage
  \makeatother
  %
  \newlength\outputvmargin
  \newlength\outputhmargin
  \setlength\outputvmargin{$VM}
  \setlength\outputhmargin{$HM}
  \newlength\outputindivvmargin
  \newlength\outputindivhmargin
  \setlength\outputindivvmargin{$IVS}
  \setlength\outputindivhmargin{$IHS}
  %
  \fboxsep=0pt%
  \setlength\fboxrule{$FW}
  \newlength\hresult
  \newlength\vresult
  \hresult=\paperwidth
  \advance\hresult by -\nbhoriz\fboxrule
  \advance\hresult by -\nbhoriz\fboxrule
  \vresult=\paperheight 
  \advance\vresult by -\nbvert\fboxrule
  \advance\vresult by -\nbvert\fboxrule
  %
  \advance\hresult by -2\outputhmargin
  \advance\vresult by -2\outputvmargin
  %
  \advance\hresult by -\nbhoriz \outputindivhmargin
  \advance\vresult by -\nbvert \outputindivvmargin
  \advance\hresult by \outputindivhmargin
  \advance\vresult by \outputindivvmargin
  %
  \divide\hresult by \nbhoriz
  \divide\vresult by \nbvert

  % computing actual scale
  \newcounter{origx}
  \setcounter{origx}{$w}
  \addtocounter{origx}{-$x}
  \newcounter{origy}
  \setcounter{origy}{$h}
  \addtocounter{origy}{-$y}
  \newlength\finalx
  \newlength\finaly
  \finalx=\hresult
  \finaly=\vresult
  \divide\finalx by \value{origx}
  \divide\finaly by \value{origy}
  \newwrite\scale
  \immediate\openout\scale=$filename.scl
  \ifdim\finalx>\finaly
    \multiply\finaly by 100
    \immediate\write\scale{\the\finaly}
  \else
    \multiply\finalx by 100
    \immediate\write\scale{\the\finalx}
  \fi
  \immediate\closeout\scale

  \begin{document}
  %\tracingoutput=1
  %\tracingpages=1
  %\tracingparagraphs=1
  \makeatletter
  \newcounter{curroutpage}
  \setcounter{curroutpage}{$firstp}
  \addtocounter{curroutpage}{-1}
  \newcounter{currpage}
  \newcounter{currcol}
  \newcounter{currline}
  \newcounter{realout}
  %\showthe\value{outpage}
  %\showthe\value{curroutpage}
  \@whilenum \value{outpage}>\value{curroutpage} \do%
    {\stepcounter{curroutpage}%
    \setcounter{currpage}{\value{curroutpage}}%
    \advance\c@currpage by -1%
    \multiply\c@currpage by \nbhoriz%
    \multiply\c@currpage by \nbvert%
    \hrule \@height\z@%
    \setcounter{currline}{0}%
    \vskip \outputvmargin%
    \@whilenum\value{currline}<\nbvert \do%
      {\hrule \@height\z@\vskip \outputindivvmargin%
        \ifnum\value{currline}>0\vskip \outputindivvmargin\fi%
        \global\stepcounter{currline}%
        \setcounter{currcol}{0}%
        \hskip \outputhmargin%
        \@whilenum\value{currcol}<\nbhoriz \do%
          {\ifnum\value{currcol}>0\hskip\outputindivhmargin\fi%
            \global\stepcounter{currcol}%
            \global\stepcounter{currpage}%
            \ifnum\value{currpage}>\value{lastpage}\else
              \setcounter{realout}{\value{currpage}}%
              \def\ang{0}%
              \ifbooklet
               \iflongedge
                %% long edge:
                %% 1->n, 2->1, 3->n-1 (rotated), 4->2(rotated)...
                \ifodd\value{realout}%           -> 1 or 3
                  \addtocounter{realout}{-1}%
                  \divide\c@realout by 2\relax
                  \ifodd\value{realout}%         -> 3
                    \def\ang{180}%
                  \else%                         -> 1
                  \fi
                  \setcounter{realout}{-\value{realout}}%
                  \addtocounter{realout}{\value{outpage}}%
                  \addtocounter{realout}{\value{outpage}}%
                \else%                           -> 2 or 4
                  \divide\c@realout by 2\relax
                  \ifodd\value{realout}%         -> 2
                  \else%                         -> 4
                    \def\ang{180}%
                  \fi
                \fi
               \else 
                %% short edge:
                %% 1->n, 2->1, 3->2, 4->n-1, 5->n-2, 6->3, 7->4, 8->n-3
                \ifodd\value{realout}%           -> 1 or 3
                  \addtocounter{realout}{-1}%
                  \divide\c@realout by 2\relax
                  \ifodd\value{realout}%         -> 3
                    \stepcounter{realout}
                  \else%                         -> 1
                    \setcounter{realout}{-\value{realout}}%
                    \addtocounter{realout}{\value{outpage}}%
                    \addtocounter{realout}{\value{outpage}}%
                  \fi
                \else%                           -> 2 or 4
                  \divide\c@realout by 2\relax
                  \ifodd\value{realout}%         -> 2
                  \else%                         -> 4
                    \setcounter{realout}{-\value{realout}}%
                    \stepcounter{realout}
                    \addtocounter{realout}{\value{outpage}}%
                    \addtocounter{realout}{\value{outpage}}%
                  \fi
                \fi
               \fi
              \fi
              \ifnum\value{realout}>$lastp
                \hskip\hresult\hskip2\fboxrule
              \else\fbox{\hbox to \hresult{\hfill
                 \expandafter\includegraphics\expandafter[viewport=$x $y $w $h,%
                    keepaspectratio,height=\vresult,width=\hresult,angle=\ang,%
                    page=\value{realout}]{\file}\hfill}}%
              \fi
            \fi}}%
        \clearpage%
  }%
  \makeatother%
  \end{document}
EOF

myecho 1+ "-> producing final file";
case $VERB in
    0|1|2)
	$PDFLATEX -interaction=batchmode $filename.tex > /dev/null 2>&1;;
    *)
	myecho 3+ " > $PDFLATEX -interaction=nonstopmode $filename.tex"
	$PDFLATEX -interaction=nonstopmode $filename.tex;;
esac
myecho 1+ "   final scale: "`cat $filename.scl | sed -e "s/pt$//"`"%";
if [[ $DEBUG == 0 ]]; then
  myecho 1+ "-> cleaning";
  myecho 3+ " > mv $MVopt $filename.pdf $OUTF"
  mv $MVopt $filename.pdf $OUTF
  myecho 3+ " > rm $RMopt $filename.*"
  rm $RMopt $filename.*
fi

exit 0





##################################################################
##
##     Manual
##
##################################################################
pdfxup creates a PDF document where each page is obtained by
combining several pages of a PDF file given as output. The
important feature of pdfxup, compared to similar programs,
is that it tries to compute the (global) bounding box of the
input PDF file, in order to remove the margins and to keep
the text only. Instead of having the font size divided by 2
(for the case of 2-up output), in some case you may end up
with the same font size as in the original document (as is
the case for a default 'article' document produced by LaTeX).

pdfxup has numerous options:
 * '-x n' and '-y n' can be used to change the number of
   rows and columns of the resulting document. 
   [default: -x2 -y1]
 * '-l n' turns the output to landscape (n=1) or portrait
   (n=0). 
   [default: -l1]
 * '-b n' toggles the 'booklet' mode: the resulting PDF can
   be printed and folded as a booklet. Printing such a
   booklet requires 2-sided printing, which can follow
   either the 'long-edge' or the 'short edge' of the paper.
   'long-edge' seems to be the most commonly used, but using
   '-b se' while produce a PDF booklet for 'short-edge'
   2-sided printing. 
 * '-p' can be used to only consider a range of pages of the 
   input file. We do not handle unions of page ranges, so that 
   only the last occurrence of '-p' will be used. The 
   restriction applies both for the computation of the 
   bounding box (and is compatible with the options '-bb' and
   '-nobb' below) and for creating the final document.
   Alternatively to '-p', the page range can be specified 
   after the file name, writing 'file.pdf:n-m' in place of
   '-p n-m'. 
 * '-bb' can be used to list the pages to be taken into
   account when computing the bounding box. This is
   especially useful for large documents, because computing the
   bounding box on each page can be long, and because
   computing the bounding box over the first 10 pages is
   usually enough... This will not change the number of pages 
   included in the final document.
   Several '-bb' options can be given, which will result in
   considering the union of all the intervals.
 * '-nobb' is used to remove pages from the computation of
   the bounding box. This is useful if one page has e.g.
   special headers (e.g. for arXiv papers). Notice that the
   bounding box of those pages will still be computed by
   ghostscript, so this does not save time. I'd be grateful
   to anyone willing to implement difference of unions of
   intervals...  ;-)
 * '-fw d' defines the width of the frame around each page.
   Set to 0pt to have no frame at all.
 * inner margins: margins to be added between each frame and
   its included page.
 * margins: margins of the final document
 * spacing: spacing between frames