#!/bin/sh
#
# $Id$
#
# Rotate one or more digital camera pictures.
#
# Usage:
#
USAGE='Usage: camrotate [-v] [-auto|-cw|-ccw|-flip] jpeg-files'
#
# Each given file is rotated by 90 degrees clockwise (default) or
# counterclockwise using jpegtran.  All digital-camera comments are
# preserved.  The thumbnail, if present, is not rotated.  This may
# cause some viewing software to display the thumbnail incorrectly.
#
# Options:
#
# -v		Verbose mode: report each file to stderr as it is processed.
# -auto		Automatically determine rotation amount from
#		orientation information in ExIF tags (default if
#		orientation data present).
# -cw		Rotate 90 degrees clockwise (default if no
#		orientation data present).
# -ccw		Rotate 90 degrees counterclockwise.
# -flip		Rotate 180 degrees

defAmount=
verbose=false

#
# Argument processing
#
while [ $# -gt 0 ]
do
    case "$1" in
	-auto)
	    defAmount=auto
	    ;;
	-cw)
	    defAmount=90
	    ;;
	-ccw)
	    defAmount=270
	    ;;
	-flip)
	    defAmount=180
	    ;;
	-v)
	    verbose=true
	    ;;
	--)
	    shift
	    break
	    ;;
	-*)	
	    echo "$USAGE" 1>&2
	    exit 2
	    ;;
	*)
	    break
	    ;;
    esac
    shift
done

case "$#" in
    0)
	echo "$USAGE" 1>&2
	exit 2
	;;
esac

#
# Process all file arguments
#
for file
do
    dir=`dirname $file`
    case "$file" in
	*.jpg)
	    base=`basename "$file" .jpg`
	    origExtension=jpg
	    extension=jpg
	    ;;
	*.jpeg)
	    base=`basename "$file" .jpeg`
	    origExtension=jpeg
	    extension=jpg
	    ;;
	*.JPG)
	    base=`basename "$file" .JPG`
	    origExtension=JPG
	    extension=jpg
	    ;;
	*.JPEG)
	    base=`basename "$file" .JPEG`
	    origExtension=JPEG
	    extension=jpg
	    ;;
	*)
	    echo "Can't handle file '$file', skipping" 1>&2
	    continue
	    ;;
    esac
    TMP="$dir/cre$$"
    trap "rm -f $TMP; exit 1" 1 2 15
    trap "rm -f $TMP; exit 0" 13
    case "$defAmount" in
	''|auto)
	    orientation=`metacam -a "$file" | grep -i orientation`
	    orientation=`expr "$orientation" : '.*\([0-9][0-9]*\).*'`
	    case "$orientation" in
		'')
		    if [ "X$defAmount" = "Xauto" ]
		    then
			echo "No orientation information in $file, skipped" \
			  1>&2
			amount=0
		    else
			amount=90
		    fi
		    ;;
		1)
		    amount=0
		    ;;
		6)
		    amount=90
		    ;;
		8)
		    amount=270
		    ;;
		*)
		    echo "Unrecognized orientation information in $file," \
		      "skipped" \
		      1>&2
		    amount=0
		    ;;
	    esac
	    ;;
	*)
	    amount=$defAmount
	    ;;
    esac
    if [ $amount -ne 0 ]
    then
	$verbose  &&  echo "Rotating $file $amount degrees clockwise" 1>&2
	jpegtran -rotate $amount -copy all "$file" > "$TMP"
	trap "" 1 2 13 15
	rm -f "$file"
	mv "$TMP" "$file"
	trap 1 2 15
	trap 13
    fi
done