#!/bin/bash

PROG=`basename $0`;

function printUsage {
cat <<EOF
USAGE: $PROG [-abcdfhklpqrR] [-D num] PREFIX
$PROG scans a set of pages from an automatic document feeder (ADF)
and creates a djvu file from the scanned pages. By default, pages are 
rotated 270 degress before the file is constructed, to put them in 
landscape orientation. (We're assuming these are double pages, as 
you would get from copying a book or journal.)

Options:
-a: Also make a PDF.
-A: Also make a PDF with split pages.
-b: Batch mode: Make a separate file for each page.
-c: Crop both first and last page.
-D: Set resolution of scan.
-d: Don't do anything, just say what we'd do.
-f: Crop top half of first page.
-h: Print this message.
-k: Keep intermediate files.
-l: Crop bottom half of last page.
-p: Try to use pnm (broken on some systems).
-q: Be quiet.
-r: Rotate pages 90 degrees.
-R: Don't rotate pages.

Prerequisites:
- We use convert, from ImageMagick, for page manipulation.
- We use the scanpages script to, uh, scan the pages.
- We use tiff2djvu to convert the scanned pages to djvu.
The latter two scripts are part of this package.
EOF
}

PDF="";
BATCH="";
CROP="";
REZ="300";
DEBUG="";
KEEP="";
EXT="";
QUIET="";
ROTATE="-r 270";

while getopts ":aAbcdD:fklprRv" opt; do
	case $opt in
		a )   PDF="-a";;
		A )   PDFSPLIT="-A";;
		b )   BATCH="-b";;
		c )   CROP="-c";;
		D )   REZ=$OPTARG;;
		d )   DEBUG="echo ";;
		f )   CROP="-f";;
		k )   KEEP="-k";;
		l )   CROP="-l";;
		p )   EXT="-p";;
		q )   QUIET="-q";;
		r )   ROTATE="-r 90";;
		R )   ROTATE="-R";;
		\? )  printUsage; exit 1;;
	esac
done

CVT=`which convert 2>/dev/null`;
if [ -z "$CVT" ]; then 
  echo "This script uses the convert utility from the ImageMagick package. It does not appear to be in your path.";
  exit 1;
fi

if [ -n "$DEBUG" ]; then
	DEBUGOPT="-d";
else
	DEBUGOPT="";
fi

shift $(($OPTIND - 1));

if [ -z "$1" ]; then 
	printUsage;
	exit 0;
else
	FILENAME="$1";
fi

TDIR="$FILENAME-$$";
TMPDIR="/tmp/$TDIR";
if [ -e "$TMPDIR" ]; then
	echo $TMPDIR exists!;
	exit 1;
fi

CURDIR=`pwd`;

$DEBUG mkdir $TMPDIR;
if [ ! $? ]; then
	echo "Unable to make $TMPDIR!";
	exit 1;
fi
$DEBUG cd $TMPDIR;

if ! $DEBUG scanpages $DEBUGOPT -g -R $REZ $QUIET $EXT $FILENAME; then
	echo "Call to scanpages failed in $PROG!";
	exit 1;
fi

if ! $DEBUG tiff2djvu $PDF $PDFSPLIT $DEBUGOPT $BATCH $ROTATE $CROP $KEEP $QUIET $EXT -o $FILENAME $FILENAME*.tiff; then
	echo "Call to tiff2djvu failed in $PROG!";
	exit 1;
fi

if [ -n "$BATCH" ]; then
	$DEBUG mv *.djvu $CURDIR/
	if [ -n "$PDF" ]; then
		$DEBUG mv *.pdf $CURDIR/
	fi
else
	$DEBUG mv $FILENAME.djvu $CURDIR/
	if [ -n "$PDF" ]; then
		$DEBUG mv $FILENAME.pdf $CURDIR/
	fi
	if [ -n "$PDFSPLIT" ]; then
		$DEBUG mv $FILENAME-split.pdf $CURDIR/
	fi
fi

$DEBUG cd $CURDIR;
if [ -n "$KEEP" ]; then 
	echo "Files are in /tmp/$TDIR/";
	exit 0; 
fi

$DEBUG rm /tmp/$TDIR/*;
$DEBUG rmdir /tmp/$TDIR/;