add city to arguments

README.md

@@ -11,5 +11,5 @@ Tested with XFCE4 and Gnome 2. Problems with Gnome >3.
 ### Usage
 
 ```bash
-earth_wallpaper.sh Tampere
+earth_wallpaper.sh --city Tampere
 ```

earth_wallpaper.sh

@@ -49,6 +49,11 @@ font_name=$("${gsettings_cmd}" get org.gnome.desktop.interface font-name | sed "
 while [ $# -gt 0 ]
 do
   case "$1" in
+    "--city")
+      shift
+      city="${1}"
+      shift
+      ;;
     "--wallpaper-file")
       shift
       wallpaper_file="${1}"
@@ -96,7 +101,6 @@ if [ -z ${curl_cmd} ]; then
 	exit 3
 fi
 
-city="$1"
 if [[ -z ${city} ]]; then
 	echo "You must indicate a city to center the image."
 	exit 4