#!/bin/bash

# ukgovweb-check:
# 	check for changes to http://barcamp.org/BarcampUKGovweb09
#


# Define & use some variables; this makes it 
# easier (to re-purpose, for example).

# this URI, we get from the email, change 'ir' & 'ea' values.
URI="http://barcamp.org/BarcampUKGovweb09"

# files, well, change these if you want. And the paths, too, if you want.
file1=~/tmp/ukgovweb09-status.new
file2=~/tmp/ukgovweb09-status
crondiff=~/tmp/ukgovweb09-crondiff

# these are the bits used in emailing, so guess what...
subj="UKGovCamp09 Wiki has changed"
mailto="adam@amyl.org.uk gmail@amyl.org.uk"

# that done, let's get cracking.

set -e

cd ~/tmp

# we use lynx 'cos it's nice and simple
lynx -dump -force_html -nolist "${URI}" | tail -n +5 > ${file1}

# remove existing diff file, if needed.
if [ -e ${crondiff} ] ; then
     rm -rf ${crondiff}
fi

# and the work's all in here..
    if [ -e ${file2} ] ; then
	if ! diff ${file2} ${file1} > /dev/null ; then
            echo 'ukgovweb wiki update:'
            echo '' 
            diff -u ${file2} ${file1} > ${crondiff} || echo "continue" >/dev/null
            mv ${file1} ${file2}
            mailx -s "${subj}" ${mailto} < ${crondiff}
        else
            rm ${file1}
        fi
   else
        mv ${file1} ${file2}
        mailx -s "${subj}" ${mailto} < ${file2}
    fi