#!/bin/bash
# Clean thumbnails cache
# Copyright (c)2007 mwgamera < mwgamera (a) gmail.com >

# CONFIGURATION
LIFE=1209600
LOG=${HOME}/.thumbnails/clean.log;

TIME=`date +%s`

# Get URI of thumbnail
getthuri() { pngmeta "$f" | awk -F ': '  -- '/Thumb::URI:/{print$2}'; }


for f in ${HOME}/.thumbnails/*/*.png; do
    
    ATIME=`stat -c%X "$f"`

    if [ `dc -e "$TIME $ATIME -p"` -gt "$LIFE" ]; then

        URI=`getthuri`
        echo "[`date -Imin`] UNUSED $URI" >> $LOG
        rm "$f" >&2 2>/dev/null

    else

        URI=`getthuri`
        # Get local path if it's local, empty string otherwise
        LOCAL=`awk -F 'file://' -- '/^file:\/\/\//{print$2}' <<< "$URI"`

        # If it's local check if base file still exists
        if [ ! -z "$LOCAL" -a ! -e "$LOCAL" ]; then
            echo "[`date -Imin`] NONEXISTENT $URI" >> $LOG
            rm "$f" >&2 2>/dev/null
        elif [ ! -z `egrep '^(http|ftp)s?://' <<< "$URI"` ]; then
            # External - check with wget
            if wget -q --spider "$URI"; then true; else
                echo "[`date -Imin`] NONEXISTENT $URI" >> $LOG
                rm "$f"  >&2 2>/dev/null
            fi
        fi

    fi

done