#!/bin/sh

tmpdir=/tmp
origdir=orig

if [ $# -lt 2 ]; then
    cat <<EOF
usage: runclahe <clip limit> <image files>...
Runs pnmclahe after converting images to PNM, then converts back.  Normally 5
by 4 tiles are used, but if the clip limit is prepended with a "g", the global
CLHE is performed instead.
EOF
    exit
fi

tiles=5x4
limit=${1#g}

if [ "$limit" != "$1" ]; then
    tiles=1x1
fi

shift

mkdir -p $origdir

while [ $# -gt 0 ]; do

    src="$1"
    trunk="${src%.*}"
    if [ "$trunk" = "$src" -o "${trunk/\/}" != "$trunk" ]; then
        trunk="$src"
        ext=
    else
        ext="${src#$trunk}"
    fi
    dest="$src"
    save=$origdir/"${trunk}_preclahe$ext"
    if [ -e "$save" ]; then
        echo "Processing previous save file $save instead of $src"
        src="$save"
    else
        echo "Processing $src"
        cp "$src" "$save"
    fi

    convert "$src" $tmpdir/runclahe-$$.ppm

    echo pnmclahe -t $tiles -l $limit $tmpdir/runclahe-$$.ppm $tmpdir/runclahe-$$-result.ppm
    pnmclahe -t $tiles -l $limit $tmpdir/runclahe-$$.ppm $tmpdir/runclahe-$$-result.ppm

    convert $tmpdir/runclahe-$$-result.ppm "$dest"

    exiftool -tagsFromFile "$src" "$dest"

    rm $tmpdir/runclahe-$$.ppm $tmpdir/runclahe-$$-result.ppm
    shift

done