add is_url and use it

bin/epm

@@ -490,7 +490,7 @@ check_filenames()
         elif [ -d "$opt" ] ; then
             has_space "$opt" && warning "There are space(s) in directory path '$opt', it is not supported. Skipped" && continue
             pkg_dirs="$pkg_dirs $opt"
-        elif echo "$opt" | grep -q "^[fhtps]*://" ; then
+        elif is_url "$opt" ; then
             has_space "$opt" && warning "There are space(s) in URL '$opt', it is not supported. Skipped" && continue
             pkg_urls="$pkg_urls $opt"
         else

bin/epm-sh-functions

@@ -678,6 +678,11 @@ has_space()
     estrlist -- has_space "$@"
 }
 
+is_url()
+{
+    echo "$1" | grep -q "^[fhtps]*://"
+}
+
 # compatibility layer
 # add realpath if missed
 if ! which realpath 2>/dev/null >/dev/null ; then