Improving the interactive configuration

src/freedombone-config

   done
   save_configuration_file
 
+  if [ ! $LOCAL_NETWORK_STATIC_IP_ADDRESS ]; then
+      LOCAL_NETWORK_STATIC_IP_ADDRESS=$(grep 'LOCAL_NETWORK_STATIC_IP_ADDRESS' temp.cfg | awk -F '=' '{print $2}')
+      if [ ! $LOCAL_NETWORK_STATIC_IP_ADDRESS ]; then
+          LOCAL_NETWORK_STATIC_IP_ADDRESS='192.168..'
+      fi
+  fi
+  if [ ! $ROUTER_IP_ADDRESS ]; then
+      ROUTER_IP_ADDRESS=$(grep 'ROUTER_IP_ADDRESS' temp.cfg | awk -F '=' '{print $2}')
+      if [ ! $ROUTER_IP_ADDRESS ]; then
+          ROUTER_IP_ADDRESS='192.168..'
+      fi
+  fi
   data=$(tempfile 2>/dev/null)
   trap "rm -f $data" 0 1 2 5 15
   dialog --backtitle "Freedombone Configuration" \
       --title "Local Network Configuration" \
       --form "\nPlease enter the IP addresses:" 11 55 3 \
-      "This system:" 1 1 "$(grep 'LOCAL_NETWORK_STATIC_IP_ADDRESS' temp.cfg | awk -F '=' '{print $2}')" 1 16 16 15 \
-      "Internet router:" 2 1 "$(grep 'ROUTER_IP_ADDRESS' temp.cfg | awk -F '=' '{print $2}')" 2 16 16 15 \
+      "This system:" 1 1 "$LOCAL_NETWORK_STATIC_IP_ADDRESS" 1 16 16 15 \
+      "Internet router:" 2 1 "$ROUTER_IP_ADDRESS" 2 16 16 15 \
       2> $data
   sel=$?
   case $sel in
           data=$(tempfile 2>/dev/null)
           trap "rm -f $data" 0 1 2 5 15
           dialog --backtitle "Freedombone Configuration" \
-              --inputbox "Domain name" 10 30 "$(grep 'DEFAULT_DOMAIN_NAME' temp.cfg | awk -F '=' '{print $2}')" 2> $data
+              --inputbox "Which domain name should your email/XMPP/IRC/VoIP be associated with?" 10 45 "$(grep 'DEFAULT_DOMAIN_NAME' temp.cfg | awk -F '=' '{print $2}')" 2> $data
           sel=$?
           case $sel in
               0) DEFAULT_DOMAIN_NAME=$(cat $data);;
 
   while [ ! $MY_EMAIL_ADDRESS ]
   do
+      EMAIL_ADDRESS=$(grep 'MY_EMAIL_ADDRESS' temp.cfg | awk -F '=' '{print $2}')
+      if [ ! $EMAIL_ADDRESS ]; then
+          EMAIL_ADDRESS=$MY_USERNAME@$DEFAULT_DOMAIN_NAME
+      fi
+
       data=$(tempfile 2>/dev/null)
       trap "rm -f $data" 0 1 2 5 15
       dialog --backtitle "Freedombone Configuration" \
-          --inputbox "Your email address" 10 30 "$(grep 'MY_EMAIL_ADDRESS' temp.cfg | awk -F '=' '{print $2}')" 2> $data
+          --inputbox "Your email address" 10 30 "$EMAIL_ADDRESS" 2> $data
       sel=$?
       case $sel in
           0) MY_EMAIL_ADDRESS=$(cat $data);;
   echo ''
 }
 
+function read_configuration {
+  if [ ! $CONFIGURATION_FILE ]; then
+      CONFIGURATION_FILE='freedombone.cfg'
+  fi
+
+  if [ -f $CONFIGURATION_FILE ]; then
+      if grep -q "MY_USERNAME" $CONFIGURATION_FILE; then
+          MY_USERNAME=$(grep "MY_USERNAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "DOMAIN_NAME" $CONFIGURATION_FILE; then
+          # for backwards compatability
+          DEFAULT_DOMAIN_NAME=$(grep "DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "DEFAULT_DOMAIN_NAME" $CONFIGURATION_FILE; then
+          DEFAULT_DOMAIN_NAME=$(grep "DEFAULT_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "NAMESERVER1" $CONFIGURATION_FILE; then
+          NAMESERVER1=$(grep "NAMESERVER1" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "NAMESERVER2" $CONFIGURATION_FILE; then
+          NAMESERVER2=$(grep "NAMESERVER2" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "DEBIAN_REPO" $CONFIGURATION_FILE; then
+          DEBIAN_REPO=$(grep "DEBIAN_REPO" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+          CHECK_MESSAGE="Check your internet connection, /etc/network/interfaces and /etc/resolv.conf, then delete $COMPLETION_FILE, run 'rm -fR /var/lib/apt/lists/* && apt-get update --fix-missing' and run this script again. If hash sum mismatches persist then try setting $DEBIAN_REPO to a different mirror and also change /etc/apt/sources.list."
+      fi
+      if grep -q "DDNS_PROVIDER" $CONFIGURATION_FILE; then
+          DDNS_PROVIDER=$(grep "DDNS_PROVIDER" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "DDNS_USERNAME" $CONFIGURATION_FILE; then
+          DDNS_USERNAME=$(grep "DDNS_USERNAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "DDNS_PASSWORD" $CONFIGURATION_FILE; then
+          DDNS_PASSWORD=$(grep "DDNS_PASSWORD" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "LOCAL_NETWORK_STATIC_IP_ADDRESS" $CONFIGURATION_FILE; then
+          LOCAL_NETWORK_STATIC_IP_ADDRESS=$(grep "LOCAL_NETWORK_STATIC_IP_ADDRESS" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "ENABLE_CJDNS" $CONFIGURATION_FILE; then
+          ENABLE_CJDNS=$(grep "ENABLE_CJDNS" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "ROUTER_IP_ADDRESS" $CONFIGURATION_FILE; then
+          ROUTER_IP_ADDRESS=$(grep "ROUTER_IP_ADDRESS" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "WIKI_TITLE" $CONFIGURATION_FILE; then
+          WIKI_TITLE=$(grep "WIKI_TITLE" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "MY_NAME" $CONFIGURATION_FILE; then
+          MY_NAME=$(grep "MY_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "MY_EMAIL_ADDRESS" $CONFIGURATION_FILE; then
+          MY_EMAIL_ADDRESS=$(grep "MY_EMAIL_ADDRESS" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "INSTALLING_ON_BBB" $CONFIGURATION_FILE; then
+          INSTALLING_ON_BBB=$(grep "INSTALLING_ON_BBB" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "PUBLIC_MAILING_LIST" $CONFIGURATION_FILE; then
+          PUBLIC_MAILING_LIST=$(grep "PUBLIC_MAILING_LIST" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "MICROBLOG_DOMAIN_NAME" $CONFIGURATION_FILE; then
+          MICROBLOG_DOMAIN_NAME=$(grep "MICROBLOG_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "REDMATRIX_DOMAIN_NAME" $CONFIGURATION_FILE; then
+          REDMATRIX_DOMAIN_NAME=$(grep "REDMATRIX_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "OWNCLOUD_DOMAIN_NAME" $CONFIGURATION_FILE; then
+          OWNCLOUD_DOMAIN_NAME=$(grep "OWNCLOUD_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "WIKI_DOMAIN_NAME" $CONFIGURATION_FILE; then
+          WIKI_DOMAIN_NAME=$(grep "WIKI_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "FULLBLOG_DOMAIN_NAME" $CONFIGURATION_FILE; then
+          FULLBLOG_DOMAIN_NAME=$(grep "FULLBLOG_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "MY_BLOG_TITLE" $CONFIGURATION_FILE; then
+          MY_BLOG_TITLE=$(grep "MY_BLOG_TITLE" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+      if grep -q "MY_BLOG_SUBTITLE" $CONFIGURATION_FILE; then
+          MY_BLOG_SUBTITLE=$(grep "MY_BLOG_SUBTITLE" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
+  fi
+}
+
+read_configuration
 interactive_configuration
 show_result
 exit 0