organizebydate

#!/bin/bash

true <<EOF
=pod

=head1 NAME

organizebydate - Rename files based on their date-time

=cut

EOF


target_template="%Y/%m/%d/"
time_field=Y
verbose=''
dryrun=0
minlevel=''
maxlevel=''
files_type=''
copy=1
do_touch=''
overwrite_opt='--no-clobber'

usage() {
	echo -n "Usage: organizebydate [-t <template>] [-c | -m | -a] [-v] [-n] [[-i | -x] <num>] <files, directories>
 --template, -t   Target path name using strftime(3) macros
                  Default: $target_template
                  Extra macros accepted:
                   %@    File's directory path
                   %.    File's name itself
 --move, --copy   Move or copy files, default is copy
 --overwrite      Enable overwrite, default is no-clobber
 --ctime, -c, --mtime, -m, --atime, -a
                  Timestamping based on change-, modify- (default) or access-time
 --email, -E      Files are raw Emails, timestamping based on Date header
 --jpeg, -J       Files are JPEG images, timestamping based on EXIF tags
 --touch          Change copied (moved) files' mtime
 --verbose, -v    Verbose mode
 --dry-run, -n    Dry run
 --min, -i        Minimum directory level
 --max, -x        Maximum directory level
"
}

while [ -n "$1" ]; do
	case "$1" in
	-h|--help)
		usage
		exit 0
		;;
	-t|--target|--template)
		shift
		target_template="$1"
		;;
	-c|--ctime)
		time_field=Z
		;;
	-m|--mtime)
		time_field=Y
		;;
	-a|--atime)
		time_field=X
		;;
	-E|--rfc822|--email)
		files_type=email
		;;
	-J|--jpeg)
		files_type=jpeg
		;;
	--touch)
		do_touch=1
		;;
	-v|--verbose)
		verbose=-v
		;;
	-n|--dry-run)
		dryrun=1
		;;
	-i|--min)
		shift
		minlevel=$1
		;;
	-x|--max)
		shift
		maxlevel=$1
		;;
	--move)
		copy=0
		;;
	--overwrite)
		overwrite_opt=''
		;;
	--copy)
		copy=1
		;;
	-*)
		echo "$0: unknown option: $1" >&2
		exit 1
		;;
	--)
		shift
		break
		;;
	*)
		break
		;;
	esac
	shift
done

if [ -z "$1" ]; then
	usage
	exit 1
fi

find "$@" ${minlevel:+-mindepth $minlevel} ${maxlevel:+-maxdepth $maxlevel} -type f -print | \
{
	set -e
	while read file
	do
		basedir=`dirname "$file"`
		basename=`basename "$file"`
		datetime=''
		filetime=''
		
		case "$files_type" in
		email)
			datetime=`grep -m 1 -i -E ^Date: "$file" | cut -d' ' -f2-`
			;;
		jpeg)
			if type exif >/dev/null 2>&1
			then
				# Date/Time Original, Create Date, Modify Date, Date
				for tagid in 0x9003 0x9004 0x0132 0x0006
				do
					datetime=`exif -m -t $tagid "$file"`
					if [ -n "$datetime" ]
					then
						break
					fi
				done
			else
				for tag in DateTimeOriginal CreateDate ModifyDate Date
				do
					datetime=`exiftool -d "%Y-%m-%d %H:%M:%S" -$tag -s3 "$file"`
					if [ -n "$datetime" ]
					then
						break
					fi
				done
			fi
			date=${datetime:0:10}
			time=${datetime:10}
			datetime=${date//:/-}${time}
			;;
		'')
			filetime=`stat -c %$time_field "$file"`
			;;
		esac

		if [ -n "$datetime" ]
		then
			filetime=`date +%s -d "$datetime"`
		fi
		
		if [ -z "$filetime" ]
		then
			continue
		fi
		
		target=`date +"$target_template" -d "@$filetime" | sed -e "s,%@,${basedir//,/\\,},g; s,%\.,${basename//,/\\,},g;"`
		
		if [ "$dryrun" = 1 ]
		then
			sgn='-'
			[ "$copy" = 1 ] && sgn='='
			echo "$file $sgn> $target"
		else
			if [ "${target: -1}" = / ]
			then
				target_dir=$target
			else
				target_dir=`dirname "$target"`
			fi
			[ -d "$target_dir" ] || mkdir -p "$target_dir"
			
			if [ "$copy" = 1 ]
			then
				cp $verbose $overwrite_opt "$file" "$target"
			else
				mv $verbose $overwrite_opt "$file" "$target"
			fi
			if [ "$do_touch" = 1 ]
			then
				touch -t `date +%Y%m%d%H%M.%S -d "@$filetime"` "$target"
			fi
		fi
	done
}