Use package exception

Throw an exception if PDFLib is not available

src/Invoice.php

@@ -6,7 +6,6 @@
 
 use DateTime;
 use Dompdf\Dompdf;
-use Exception;
 use Locale;
 use stdClass;
 use Twig\Environment;
@@ -122,14 +121,22 @@ public function renderHtml() : string
  *
  * @return string
  *
- * @throws Exception
+ * @throws InvoiceException
  */
  public function renderPdf(array $options = []) : string
  {
- if (($options['engine'] ?? '') === 'wkhtmltopdf') {
+ $engine = $options['engine'] ?? '';
+
+ if ($engine === 'wkhtmltopdf') {
  return $this->renderWK($options);
  }
 
+ if ($engine === 'PDFLib') {
+ if (!extension_loaded('PDFLib')) {
+ throw new InvoiceException('PDFLib extension not found');
+ }
+ }
+
  if ($options['debug'] ?? null) {
  global $_dompdf_show_warnings, $_dompdf_debug, $_DOMPDF_DEBUG_TYPES;
 
@@ -201,7 +208,7 @@ public function renderPdf(array $options = []) : string
  return $output;
  }
 
- throw new Exception('dompdf output');
+ throw new InvoiceException('dompdf output');
  }
 
  public function seller() : ?Entity
@@ -225,7 +232,7 @@ public function items() : array
  public function date() : DateTime
  {
  if (!isset($this->date)) {
- throw new Exception('date not set');
+ throw new InvoiceException('date not set');
  }
 
  return $this->date;
@@ -268,7 +275,7 @@ public function total() : float
  $total = $this->subtotal() + $this->shipping?->price() - $this->discount?->price() + $this->taxAmount();
 
  if ($total <= 0) {
- throw new Exception('invoice total <= 0');
+ throw new InvoiceException('invoice total <= 0');
  }
 
  return $total;
@@ -391,7 +398,7 @@ private function renderWK(array $options) : string
  }
 
  if (!file_exists($exe)) {
- throw new Exception('cannot find wkhtmltopdf executable');
+ throw new InvoiceException('cannot find wkhtmltopdf executable');
  }
 
  $descriptorSpec = [
@@ -407,7 +414,7 @@ private function renderWK(array $options) : string
  $process = proc_open("{$exe} --enable-local-file-access --page-size {$options['paper']} --orientation {$options['orientation']} - -", $descriptorSpec, $pipes, null, null, null);
 
  if (!is_resource($process)) {
- throw new Exception('wkhtmltopdf open process');
+ throw new InvoiceException('wkhtmltopdf open process');
  }
 
  // write input data
@@ -427,6 +434,6 @@ private function renderWK(array $options) : string
  return $pdf;
  }
 
- throw new Exception('wkhtmltopdf process return value');
+ throw new InvoiceException('wkhtmltopdf process return value');
  }
 }

src/InvoiceException.php

@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Oct8pus\Invoice;
+
+use Exception;
+
+class InvoiceException extends Exception
+{
+}