addet math function

.zshrc

@@ -520,9 +520,16 @@ _tools_(){
       has $pkgs
     }
   fi
-
 }
 
+if command_exists bc; then
+  math() {
+    echo "$*" | bc -l
+  }
+else
+  echo_error "No bc, so no math will work"
+fi
+
 main(){
   get_packager
   _init