#!/bin/bash

# generate-calendar

# Version: 1.0
# Created: February 8, 2006
# Created By: JMC support (at) moonpoint.com
# Updated: February 8, 2006

# Description: Generates an HTML calendar for the given year. The output file
# must be specified on the command line with the -o argument, 
# e.g. -o /example/index.html. The year must also be specified on the
# command line with -y yy, e.g. -y 06. If the output file already exists
# the user will be prompted as to whether it should be overwritten.
# 

# Requires: pcal (see http://pcal.sourceforge.net/)
# Available from: http://support.moonpoint.com/downloads/computer_languages/bash/generate-calendar

print_usage()

{
  echo 'Usage: generate-calendar -o output_file [-t title]  [-y yy]'
  echo ' '
  echo 'The script takes optional title and year arguments'
  echo ' '
  echo '-o specifies the HTML output file, e.g. /example/index.html'
  echo '-t specifies the title and heading for the HTML file'
  echo '   If there is a space in the title enclose it in double quotes'
  echo '-y specifies the year for the calendar, e.g. 06'
  echo '   If no year is specified, the calendar will be created only' 
  echo '   for the current month'
}

# If no arguments are included on the comand line then print
# usage information and exit.
if [ $# -eq 0 ]; then
  print_usage
  exit 1
fi

# See page 145 of "Learning the bash Shell" for getopts information.
while getopts ":o:t:y:" opt; do
  case $opt in
    o  ) outfile=$OPTARG;;
    t  ) title=$OPTARG;;
    y  ) year=$OPTARG;;
    \? ) print_usage
         exit 1
  esac
done
shift $(($OPTIND -1))

if [ -e $outfile ]; then
  echo "$outfile exists"
  echo -n "Overwrite (y/n)? "
  read Response
  # Translate uppercae characters to lowercase
  Response=`echo $Response | tr A-Z a-z`
  case "$Response" in
    y    ) `pcal -H -C "$title" -o $outfile $year`
           exit 0;;
    n    ) echo 'File not overwritten - exiting.'
           exit 1;;
    *    ) echo 'You must enter y or n.';;
   esac
fi

`pcal -H -C "$title" -o $outfile $year`