#!/bin/bash

##################################
# iCal export tool 1.0           #
# by Fredrik Boström             #
# fredrik@fredrikbostrom.net     #
##################################

usage() {
cat <<EOF
Usage: $0 options

This scripts traverses the Apple iCal directory structure and exports all events into .ics files, one per logical calendar in iCal. 

OPTIONS:
  -h   Show this message
  -o   The output directory (mandatory)
  -d   The iCal Library directory, e.g. /Users/john/Library/Calendars
       (defaults to the current directory)
EOF
}

SOURCEDIR="."
BASENAME="calendar"

while getopts "hd:o:" OPTION
do
  case $OPTION in
      h)
	  usage
	  exit 1
	  ;;
      d)
	  SOURCEDIR=$OPTARG
	  ;;
      o)
	  OUTDIR=$OPTARG
	  ;;
      ?)
	  usage
	  exit
	  ;;
      esac
done

if [ -z $OUTDIR ]
then
    usage
    exit 1
fi

cd $SOURCEDIR
INDEX=1

for dir in `find . -type d -name Events`
do
  cd $dir

  # find first file and get the calendar info from it
  sed -n -e '1,/BEGIN:VEVENT/ { /BEGIN:VEVENT/b; p }' `ls -1 *.ics|sed -n '1 p'` > $OUTDIR/${BASENAME}_${INDEX}.ics

  # for each file in the directory, append to outfile the event it contains
  sed -n '/BEGIN:VEVENT/,/END:VEVENT/ p' *.ics >> $OUTDIR/${BASENAME}_${INDEX}.ics
  
  # end the calendar
  echo 'END:VCALENDAR' >> $OUTDIR/${BASENAME}_${INDEX}.ics

  cd -

  INDEX=`expr $INDEX + 1`
done