[TwigBundle] Fancy output for twig:lint

Author: alexandresalome

src/Symfony/Bundle/TwigBundle/Command/LintCommand.php

@@ -88,9 +88,48 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         foreach ($files as $file) {
-            $twig->parse($twig->tokenize(file_get_contents($file), (string) $file));
+            try {
+                $twig->parse($twig->tokenize(file_get_contents($file), (string) $file));
+                $output->writeln(sprintf("<info>OK</info> in %s", $file));
+            } catch (\Twig_Error $e) {
+                $this->renderException($output, $file, $e);
+            }
+        }
+    }
+
+    protected function renderException(OutputInterface $output, $file, \Twig_Error $exception)
+    {
+        $line =  $exception->getTemplateLine();
+        $lines = $this->getContext($file, $line);
+
+        $output->writeln(sprintf("<error>KO</error> in %s (line %s)", $file, $line));
+        foreach ($lines as $no => $code) {
+            $output->writeln(sprintf(
+                "%s %-6s %s",
+                $no == $line ? '<error>>></error>' : '  ',
+                $no,
+                $code
+            ));
+            if ($no == $line) {
+                $output->writeln(sprintf('<error>>> %s</error> ', $exception->getRawMessage()));
+            }
+        }
+    }
+
+    protected function getContext($file, $line, $context = 3)
+    {
+        $fileContent = file_get_contents($file);
+        $lines = explode("\n", $fileContent);
+
+        $position = min(0, $line - $context);
+        $max = min(count($lines), $line - 1 + $context);
+
+        $result = array();
+        while ($position < $max) {
+            $result[$position + 1] = $lines[$position];
+            $position++;
         }
 
-        $output->writeln('<info>No syntax error detected.</info>');
+        return $result;
     }
 }