#!/bin/bash
# 05/26/11
# 08/07/11: added quota support
# dayid@dayid.org
#
if [ $1 ];
   then case $1 in 
        -d) # Allow override of 95% of REAL DISK usage
            if [ $2 ]; then CLEANOUT=$2; else echo "You must specify a number value here from 1-100" && exit 1; fi
            TYPE=disk
            CHECK=$( df -h /home 2>/dev/null    | tail -n 1 | awk '{ print $5 }' | cut -d "%" -f "1" )
            ;;
        -q) # Allow override of REAL DISK by using percent of QUOTA instead
            if [ $2 ]; then CLEANOUT=$2; else echo "You must specify a number value here from 1-100" && exit 1; fi
            TYPE=quota
            CHECK=$( quota -f /home 2>/dev/null | tail -n 1 | awk '{ print $2" / "$3" * 100" }' | bc -ql | cut -d "." -f 1 )
            ;;
        esac
   else # Default to allow up to 95% of /home to be used.
        CLEANOUT=95
        type=disk
        CHECK=$USAGED
fi
CHECK1=$CHECK
date > ~/.cleantrash
echo "Current usage is ${CHECK}% of $TYPE." | tee -a ~/.cleantrash 

echo "Proceeding cleanout to match ${CLEANOUT}% or less of ${TYPE}." | tee -a ~/.cleantrash
cd ~/.trash/


if [ $CHECK -gt $CLEANOUT ]
   then echo "Since ${CHECK}% is > ${CLEANOUT}%, it's time to clean." | tee -a ~/.cleantrash
 	ls -a | egrep "[\'\"\(\)\&\#\$\^\!\ ]" > ~/.namestrash
        while read FILE; do
              NEW=`echo ${FILE} | tr "[\'\"\(\)\&\#\$\^\!\ ]" '_'`
              mv -f "${FILE}" "${NEW}" && echo "Renamed: ${FILE} to ${NEW}"
        done < ~/.namestrash
        find . -size 0 -exec /bin/rm -fv {} \; | tee -a ~/.cleantrash
        while [ $CHECK -gt $CLEANOUT ]; do 
              RMFILE=`ls -trc | head -2 | tail -1`
              if [ $RMFILE ]; then true
                 else echo "Trash is empty but /home is still ${CHECK}% full and you wanted ${CLEANOUT}%" | tee -a ~/.cleantrash
                      cat ~/.cleantrash | mail -s "cleantrash.sh: Can't clear more space" dayid && echo "Mailing you"
                      exit 1
              fi
              /bin/rm -rfv -- "${RMFILE}" | tee -a ~/.cleantrash
              case $TYPE in
              disk) CHECK=$( df -h /home | tail -n 1 | awk '{ print $5 }' | cut -d "%" -f "1" ) ;;
              quota) CHECK=$( quota -f /home 2>/dev/null | tail -n 1 | awk '{ print $2" / "$3" * 100" }' | bc -ql | cut -d "." -f 1 ) ;;
              esac
        done
        case $TYPE in
        disk) CHECK2=$( df -h /home | tail -n 1 | awk '{ print $5 }' | cut -d "%" -f "1" ) ;;
        quota) CHECK2=$( quota -f /home 2>/dev/null | tail -n 1 | awk '{ print $2" / "$3" * 100" }' | bc -ql | cut -d "." -f 1 ) ;;
        esac
        echo "Disk usage is now ${CHECK2}% of allowed ${CLEANOUT}%. It was ${CHECK1}% when we started." | tee -a ~/.cleantrash
        cat ~/.cleantrash | mail -s "cleantrash.sh: Had to remove files in .trash to save space" dayid && echo "Mailing you a list of removed files"
   else echo "${CHECK}% is <= ${CLEANOUT}%, exiting"; exit 0
fi