Fix pretty print with pipes

src/cfnlint/formatters/pretty.py

@@ -28,7 +28,8 @@ def print_matches(self, matches, rules, config):
 
         # ruff: noqa: E501
         results.append(
-            f"Cfn-lint scanned {colored(len(config.templates), color.bold_reset)} templates against "
+            f"Cfn-lint scanned {colored(len(config.templates) if config.templates else 1, color.bold_reset)}"
+            " templates against "
             f"{colored(len(rules.used_rules), color.bold_reset)} rules and found "
             f'{colored(len([i for i in matches if i.rule.severity.lower() == "error"]), color.error)} '
             f'errors, {colored(len([i for i in matches if i.rule.severity.lower() == "warning"]), color.warning)} '

test/unit/module/formatters/test_formatters.py

@@ -213,6 +213,20 @@ def test_pretty_formatter(self):
                 ),
             )
 
+    def test_pretty_formatter_pipe(self):
+        """Test pretty formatter"""
+        formatter = PrettyFormatter()
+        self.config.cli_args.templates = None
+        results = formatter.print_matches(
+            self.results, rules=self.rules, config=self.config
+        ).splitlines()
+
+        if sys.stdout.isatty():
+            self.assertIn("Cfn-lint scanned 1 templates", results[5])
+        else:
+            # Check the errors
+            self.assertIn("Cfn-lint scanned 1 templates", results[5])
+
     def test_json_formatter(self):
         """Test JSON formatter"""
         formatter = JsonFormatter()