#!/bin/sh -e

usage()
{
  cat >&2 << EOF
usage: $(basename $0) options
Postfix message queue grep utility by MW (v0.99).

Help:
	-h              Show this message

Selection criteria (exclusive):
	-f <regexp>	Match sender address
	-r <regexp>	Match recipient address
	-s <regexp>	Match against the size in bytes
	-d <regexp>	Match against the date (format Mon Jan 30 10:16:15)

Display options:
	-l		Long Format [Default]
	-i		Message IDs only

Examples:
$(basename $0) -f 'MAILER-DAEMON' -i
$(basename $0) -r '.*@example\.com'
EOF
}

LONGFORMAT=true

while getopts ":hf:r:s:d:li" OPTION
do
  case $OPTION in
    h)
      usage
      exit 0
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      usage
      exit 1
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      usage
      exit 1
      ;;
    f)
      MATCHFIELDS='$7'
      EXPR=$(echo $OPTARG | sed 's/\\/\\\\/g')
      ;;
    r)
      MATCHFIELDS='$8'
      EXPR=$(echo $OPTARG | sed 's/\\/\\\\/g')
      ;;
    s)
      MATCHFIELDS='$2'
      EXPR=$(echo $OPTARG | sed 's/\\/\\\\/g')
      ;;
    d)
      MATCHFIELDS='$3 " " $4 " " $5 " " $6'
      EXPR=$(echo $OPTARG | sed 's/\\/\\\\/g')
      ;;
    l)
      LONGFORMAT=true
      ;;
    i)
      LONGFORMAT=false
      ;;
  esac
done

if [ -z ${EXPR+x} ]; then
  usage
  exit 1
fi

postqueue -p | tail -n+2 | head -n-1 | grep -v '^ *(' | awk \
'BEGIN { RS = "" }
{
  if ('"$MATCHFIELDS"' ~ /'"${EXPR}"'/ && $9 == "")
    print'"$( $LONGFORMAT || printf ' $1' )"';
}
' | tr -d '*!'