Improve the add-submodule script by making it so it doesn't need a second argument

add-submodule

@@ -1,6 +1,17 @@
 #!/usr/bin/env bash
 
-[[ -z "$2" ]] && exit 1
+# Exit if no argument has been provided
+[[ -z "$1" ]] && exit 1
 
-git submodule add "$1" "vim/bundle/$2"
+# Variables
+url="$1"
+name="${url/*\/}"
+
+# Exit if no name exists or the url and name variables are the same
+[[ -z "$name" || "$url" = "$name" ]] && exit 1
+
+# Add the submodule
+git submodule add "$url" "vim/bundle/$name" || exit 1
+
+# Initialize the submodule
 git submodule update --init --recursive