Restructured PIZZA-Script to be easier deployable

- Includes-directory can be set via PIZZAINC. This enables the user to
   put the ASCII-Art where he wants it

 - Hostname and user are now evaluated at the beginning and stored within
   PIZZAHOST and PIZZAUSER

src/pizza

@@ -1,5 +1,9 @@
 #!/bin/bash
 
+: ${PIZZAINC:="/usr/local/share/pizza"}
+PIZZAHOST=$(hostname -f)
+PIZZAUSER=$(whoami)
+
 help() {
     echo "pizza - sent small ASCII-Icons by Mail"
     echo "--------------------------------------"
@@ -9,15 +13,15 @@ help() {
 }
 
 if [ ! "$2" ]; then
-    mail -s "$(whoami) sent you a Pizza on srv.r.f3l.de!" $1 < /usr/local/share/pizza/pizza.txt
+    mail -s "${PIZZAUSER} sent you a Pizza on ${PIZZAHOST}!" $1 < "${PIZZAINC}/pizza"
     exit 0
 else
     case "$1" in
         "-p" | "--pizza")
-            mail -s "$(whoami) sent you a Pizza on srv.r.f3l.de" $2 < /usr/local/share/pizza/pizza.txt
+            mail -s "${PIZZAUSER} sent you a Pizza on ${PIZZAHOST}" $2 < "${PIZZAINC}/pizza"
             ;;
         "-l" | "--heart")
-            mail -s "$(whoami) sent you a Heart on srv.r.f3l.de" $2 < /usr/local/share/pizza/heart.txt
+            mail -s "${PIZZAUSER} sent you a Heart on ${PIZZAHOST}" $2 < "${PIZZAINC}/heart.txt"
             ;;
         "-h" | "--help")
             help