next

#!/bin/bash
ITER="cur"

if [ $# -gt 0 ] && [ $1 = -i ]
then
    ITER="$2"
fi

if [ $# -gt 0 ] && [ $1 = -h ]
then
    cat <<EOF
next - iterate over files using a symbolic link as pointer

options:
    -i ITERATORFILE
        use ITERATORFILE instead of "./cur"
usage:
    \$ next #initialize cur pointer
    firstfile
    \$ vi ./cur
    \$ echo \$(readlink ./cur)
    firstfile
    \$ next #increment pointer
    secondfile
    \$ echo \$(readlink ./cur)
    secondfile
    \$ while [ -n "\`next\`" ] ; do echo \`readlink ./cur\`; done
EOF
exit
fi

ALL=$(find . -maxdepth 1 -printf "%f\n"|sed 1d|sed 's/^$ITER$//'|sort)
if [ ! -e $ITER ]
then
    NEXT=$(pwd)/`echo "$ALL" | sed 1q`
else
    CURFILE=$(basename "`readlink $ITER`")
    CURFILE=$(printf '%q' "$CURFILE")
    NEXT=$(echo "$ALL" |grep -A1 "^$CURFILE$")
    NEXT=$(echo "$NEXT"|sed 1d)
    if [ -z $NEXT ]
    then
        exit 1
    fi
    NEXT=$(pwd)/$NEXT
fi
if [  -e $ITER ]
then
    rm $ITER
fi
echo $NEXT
if [  -e "$NEXT" ]
then
    ln -s "$NEXT" $ITER
fi