#!/usr/bin/env bash

# scan.sh
# This will scan stuff from the scanner to the current directory
# with auto-numbering as PNG.
#
# Usage: w=130 h=210 t=128 ./scan.sh front color 300

SCANNER="fujitsu:fi-4120Cdj:623467"  # Give it your own
FORMAT="png"
curdir="$(pwd)"

# Arguments
#   $1: source (front/back/duplex) - mandatory
#   $2: color (color/gray/grey/bw) - mandatory
#   $3: dpi (number) - optional

function batchstart {
	lastindex="$(\ls | sort -n | tail -n 1 | sed 's/\..*//g')"
	echo $((lastindex+1))
}

command="scanimage -d '$SCANNER' --format $FORMAT --batch='%d.$FORMAT' --progress --page-width $w --page-height $h --batch-start $(batchstart)"

# Normalize arguments
command+=" --source"
case $1 in
	front) command+=" 'ADF Front'" ;;
	back) command+=" 'ADF Back'" ;;
	duplex) command+=" 'ADF Duplex'" ;;
	*) >&2 echo "invalid source";;
esac

case $2 in
	color) command+=" --mode Color --contrast 15 --brightness 25" ;;
	gray) command+=" --mode Gray --contrast 15 --brightness 25" ;;
	bw) command+=" --mode Lineart --threshold $t" ;;
	*) >&2 echo "invalid color";;
esac

if [ $3 -gt 0 ]; then command+=" --resolution $3"; else command+=" --resolution 600"; fi

eval "$command"