setup stuff for per-host xterm background colors

.zlogout

···
+if [ "$XTERMBG" != "" ] && [ -f ~/.xtermbg ]; then
+	xtermcontrol --bg="$XTERMBG"
+fi

.zshrc

···
    watch=
 fi
 
+# if this host has a custom xterm background color, save the current one now
+if [ -f ~/.xtermbg ]; then
+   export XTERMBG=`xtermcontrol --get-bg 2>/dev/null`
+   xtermcontrol --bg=`cat ~/.xtermbg`
+fi
+
 # load any local aliases and machine-specific things
-if [[ $OSTYPE = darwin* ]]; then
-   if [ -f ~/.zshrc.mac ]; then
-      source ~/.zshrc.mac
-   fi
+if [[ $OSTYPE = darwin* ]] && [ -f ~/.zshrc.mac ]; then
+  source ~/.zshrc.mac
 fi
+
 if [ -f ~/.zshrc.local ]; then
    source ~/.zshrc.local
 fi