#!/bin/bash

# move one or more files/dirs to date-tagged names:
# foo --> foo-2001.03.29
# where the date part is the date of the last file modification
# ... online at http://www.jjj.de/
# author: Joerg Arndt ( arndt (AT) jjj.de )

# version: 2003-January-04 (15:39)

THIS='jjold'; # `basename $0`;

function usage
{
cat <<EOF
  usage: $THIS  [OPTION(s)] FILE1 [ FILE2 FILE3 ... ]
  where files may also be directories

   move/copy one or more files/dirs to date-tagged names:
    e.g. foo --> foo-2001.03.29
    where the date part is the date of the last file modification

  OPTION(s) must precede any other arguments.
   "-q" Quiet: supress output (option is unset if "-n" is also given).
   "-n" sets dry run mode (do Nothing)
   "-t" append date and Time
   "-w" noW: use current date/time
   "-c" Copy file (instead of moving it)
   "-d <dir>" move/copy file to Directory
   "-z" compress file after renaming (using gZip)
        NOTE: -z presently doesn't loop until a uniq name is found

$THIS is online: at http://www.jjj.de/
EOF
}

if [ "$1" = "--help" ]; then  usage; exit 0;   fi
if [ "$1" = "-help" ];  then  usage; exit 0;   fi

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

DRYRUN=
COPY=
TODIR=
TIME=
QUIET=
COMPRESS=
NOW=
while getopts :ctnwqhz\?d: OPT; do
    case $OPT in
        h|+h|\?|+\?)
            usage
            exit 0;
            ;;
        n|+n)
            DRYRUN=1;
            ;;
        c|+c)
            COPY=1;
            ;;
        d|+d)
            TODIR=$OPTARG;
            ;;
        t|+t)
            TIME=1;
            ;;
        q|+q)
            QUIET=1;
            ;;
        z|+z)
            COMPRESS=1;
            ;;
        w|+w)
            NOW=1;
            ;;
        *)
#            echo "usage: ${0##*/} [+- ARG] [+-ct] [--] ARGS..."
            usage;
            exit 1;
    esac
done
shift $[ OPTIND - 1 ]

#echo "DRYRUN=$DRYRUN  COPY=$COPY  TIME=$TIME"
#exit;

if [ -n "DRYRUN" ]; then  QUIET=""; fi

if [ -n "$TODIR" ]; then
    test -d $TODIR -a -w $TODIR || \
        { echo "$TODIR must be a writable directory."; exit 1; };
    TODIR=$TODIR'/';
fi


for f in $* ; do

    f=${f%%/}

    if [ ! -e $f ]; then
        echo "$f: no such file or directory"
        continue; ## we might want a nonzero return value
    fi


    if [ -n "$TIME" ]; then
        FORMAT='%Y.%m.%d-%H:%M:%S'; ## exact
    else
        FORMAT='%Y.%m.%d';  ## just date
    fi

    if [ -n "$NOW" ]; then
        DATE=$(date +$FORMAT); ## date = now
    else
        DATE=$(date -r $f +$FORMAT); ## date = file modification time
    fi

    NEW=$f-$DATE;
    if [ -e $TODIR$NEW ] ; then ## loop until a unused filename is found
        NUM=1;
        while [ -e $TODIR$NEW ] ; do
            NEW=$f-$DATE--$NUM
            let NUM=$NUM+1
        done
    fi
    DNEW=$TODIR$NEW;

    if [ -z "$QUIET" ]; then  echo "$f  -->  $DNEW";  fi

    if [ -n "$DRYRUN" ]; then  continue;  fi  ## dryrun: just pretend actions

    if [ -n "$COPY" ]; then
        cp -a $f $DNEW
    else
        mv $f $DNEW
    fi

    ## FIXME: need to find unused name.gz / name.tar.gz
    if [ -n "$COMPRESS" ]; then
    	if [ -d "$NEW" ]; then
                ZNEW=$DNEW.tar.gz
		tar cfz $ZNEW $DNEW
                rm -rf $DNEW
	else
                ZNEW=$DNEW.gz
		gzip -9 $DNEW
	fi
    	if [ -z "$QUIET" ]; then  echo "  -->  $ZNEW";  fi
    fi
    
done


exit 0;
#######################################