feat(ParseResult): Add isEmpty API to check result emptyness

Signed-off-by: prajwalch <[email protected]>

src/ArgMatches.zig

@@ -30,10 +30,7 @@ parse_result: *const ParseResult,
 /// }
 /// ```
 pub fn containsArgs(self: *const ArgMatches) bool {
-    // zig fmt: off
-        return (self.parse_result.getArgs().count() >= 1
-                or self.parse_result.getSubcommandParseResult() != null);
-        // zig fmt: on
+    return !self.parse_result.isEmpty();
 }
 
 /// Checks whether an option, positional argument or subcommand with the

src/parser/ParseResult.zig

@@ -98,6 +98,11 @@ pub fn getSubcommandParseResult(self: *const ParseResult) ?*const ParseResult {
     return @as(?*const ParseResult, self.subcmd_parse_result);
 }
 
+/// Returns `true` if the result is completely empty.
+pub fn isEmpty(self: *const ParseResult) bool {
+    return (self.getArgs().count() == 0) and (self.getSubcommandParseResult() == null);
+}
+
 /// Inserts a given name-value pair into the map.
 ///
 /// If the map already contains the name, value will be updated and if it didn't