#!/bin/sh

USAGE='Usage: brewsort <image-files>

  Sort image-files into new directory based on date information in EXIF-metatag.

  Depends on exiftool.

  Copyright © Daniel Ljunggren <foto@demulsion.se>. April 2010.

[options]:
  -s <string>  : Suffix to directory name
  -d <YYMMDD>  : Use specific date as directory name
'

SUFFIX=""
DATE=""

while [ $# -gt 0 ] 
do
    case "$1" in
	-s)
	    SUFFIX="_$2"
	    shift 1
	    ;;
	-d) if [[ $2 == [0-9][0-9][0-9X][0-9X][0-9X][0-9X] ]]; then
		DATE="$2"
	    else
		echo "$USAGE" 1>&2
		exit 2
	    fi
	    shift 1
	    ;;
	-*)	
	    echo "$USAGE" 1>&2
	    exit 2
	    ;;
	*)
	    break
	    ;;
    esac
    shift 1
done

for FILE 
do
    if [ -e "${FILE}" ]; then
	
	DIR=`dirname $FILE`
	BASE=`basename $FILE`
	
	if [[ -z ${DATE} ]]; then
	    # Find the creation date for file
	    EXIFERROR=`exiftool $FILE 2>&1 1>/dev/null | grep Error` # Redirect stdout to null and stderror to stdout
	    # Use the file's EXIF image information if file type supported
	    if [[ -z "$EXIFERROR" ]]; then
		DATE_YY=`exiftool -p '$DateTimeOriginal' $FILE | cut -b1-4 | sed 's/ //;s/://g'`
		DATE_MM=`exiftool -p '$DateTimeOriginal' $FILE | cut -b6-7 | sed 's/ //;s/://g'`
	    fi
	    
            # Use the file's date in filename if above information failed
	    if [ -z $DATE_YY ] || [ -z $DATE_MM ]; then
		DATE_YY_short=`expr "$BASE" : '.*[A-Z]\([0-9][0-9]\)[0-9][0-9][0-9][0-9].*$'`
		DATE_YY=20"$DATE_YY_short"
		DATE_MM=`expr "$BASE" : '.*[A-Z][0-9][0-9]\([0-9][0-9]\)[0-9][0-9].*$'`
		echo "brewsort: Warning: Using the file's date in filename to sort $FILE"
	    fi
	    
            # Use the file's date-stamp if above information failed
	    if [ -z $DATE_YY ] || [ -z $DATE_MM ]; then
		#DATE=`date -r "$FILE" +%y%m%d`
		DATE_YY=`date -r "$FILE" +"%Y"`
		DATE_MM=`date -r "$FILE" +"%m"`
		echo "brewsort: Warning: Using the file's date-stamp to sort $FILE"
	    fi
	else
   	    DATE_YY_short=`expr "${DATE}" : '.*\([0-9][0-9]\)[0-9][0-9][0-9X][0-9X].*$'`
	    DATE_YY=20"$DATE_YY_short"
	    DATE_MM=`expr "${DATE}" : '.*[0-9][0-9]\([0-9][0-9]\)[0-9X][0-9X].*$'`
	    echo "brewsort: Warning: Using the specified date ${DATE} to sort $FILE"
	fi
	
        # Create new catalog if it doesn't exist
	NEWDIR=${DATE_YY}\_${DATE_MM}${SUFFIX}
	#mkdir -p "${DIR}/${NEWDIR}"
	mkdir -p "${NEWDIR}"
	
	#NEWFILE="${DIR}/${NEWDIR}/${BASE}"
	NEWFILE="${NEWDIR}/${BASE}"
	
        # Rename file
	if [ ! -e "${NEWFILE}" ]; then
	    mv "${FILE}" "${NEWFILE}"
	    chmod 644 "${NEWFILE}"
	    echo "brewsort: ${NEWFILE} created..."
	else
	    echo "brewsort: Warning: ${NEWFILE} already exist, skipping..."
	fi
    else
	echo "brewsort: Warning: ${FILE} does not exist, skipping..."
    fi
	
done