Refactor schema validation and dump, update README

Adjusted printDumpOfSchema to handle null schema and improve display of dumped schema in XML format. Moved calling of printDumpOfSchema method after possible exceptions in ValidateCsv. Also, clarified instructions for troubleshooting faulty presets in the README documentation.

README.md

@@ -962,8 +962,9 @@ In fact, this can be considered as partial inheritance.
    Otherwise, it might break the syntax.
 
 **If something went wrong**
-If you're having trouble working with presets and don't understand how the CSV Blueprint under the hood understands 
-it, just add `--dump-schema` to see it. Also, there is a separate CLI command for validating schema:
+
+If you're having trouble working with presets and don't understand how the CSV Blueprint under the hood understands it,
+just add `--dump-schema` to see it. Also, there is a separate CLI command for validating schema:
 
 ```shell
 ./csv-blueprint validate:schema --dump-schema --schema=./your/schema.yml

src/Commands/AbstractValidate.php

@@ -160,12 +160,19 @@ protected function renderIssues(string $prefix, int $number, string $filepath, i
         $this->out("{$prefix}<yellow>{$number} {$issues}</yellow> in {$filepath}", $indent);
     }
 
-    protected function printDumpOfSchema(Schema $schema): void
+    protected function printDumpOfSchema(?Schema $schema): void
     {
+        if ($schema === null) {
+            return;
+        }
+        $dump = $schema->dumpAsYamlString();
+        $dump = \preg_replace('/^([ \t]*)([^:\n]+:)/m', '$1<c>$2</c>', $dump);
+
         if ($this->getOptBool('dump-schema')) {
-            $this->_('```yaml');
-            $this->_($schema->dumpAsYamlString());
-            $this->_('```');
+            $this->_('<blue>```yaml</blue>');
+            $this->_("# File: <blue>{$schema->getFilename()}</blue>");
+            $this->_($dump);
+            $this->_('<blue>```</blue>');
         }
     }
 

src/Commands/ValidateCsv.php

@@ -142,10 +142,10 @@ private function validateSchemas(array $schemaFilenames): int
                     continue;
                 }
 
+                $schema = null;
+
                 try {
                     $schema = new Schema($schemaFilename->getPathname());
-                    $this->printDumpOfSchema($schema);
-
                     $schemaErrors = $schema->validate($quickCheck);
                     if ($schemaErrors->count() > 0) {
                         $this->renderIssues($prefix, $schemaErrors->count(), $schemaPath, 2);
@@ -161,6 +161,7 @@ private function validateSchemas(array $schemaFilenames): int
                         "{$prefix}Exception: <yellow>{$e->getMessage()}</yellow>",
                     ], 2);
                 }
+                $this->printDumpOfSchema($schema);
             }
 
             $this->out('');

src/Commands/ValidateSchema.php

@@ -77,7 +77,7 @@ protected function executeAction(): int
             try {
                 $schema = new Schema($filename);
                 $schemaErrors = $schema->validate($this->isQuickMode());
-                $this->printDumpOfSchema($schema);
+                $this->printDumpOfSchema(new Schema($filename));
             } catch (ParseException $e) {
                 $schemaErrors->addError(new Error('schema.syntax', $e->getMessage(), '', $e->getParsedLine()));
             } catch (\Throwable $e) {