Merge pull request #5 from langleyfoxall/feature/extra-arguments

Allow additional arguments to be added.

README.md

@@ -41,6 +41,16 @@ A path to a Ghostscript executable can be passed into the `PdfStitcher` construc
 new PdfStitcher('a/path/to/a/gs/executable')
 ```
 
+### Additional Ghostscript arguments
+
+Additional Ghostscript arguments can be passed into the `PdfStitcher` constructor:
+
+```php
+new PdfStitcher(null, '-dNEWPDF=false')
+```
+
+These will NOT be escaped in any way.
+
 ### Including only specific pages from a PDF
 
 You may optionally give an array of page indices when adding a PDF:

src/PdfStitcher.php

@@ -25,14 +25,21 @@ class PdfStitcher
      */
     private $overriddenGhostscriptExecutablePath = null;
 
+    private $extraGhostscriptArguments = null;
+
     /**
      * Creates a new instance of the PDF stitcher.
      * 
      * @param ?string $overriddenGhostscriptExecutablePath A path to a Ghostscript executable to use instead of the default "gs".
+     * @param ?string $extraGhostscriptArguments Extra Ghostscript arguments to be included in any commands executed.  No escaping will be performed.
      */
-    public function __construct($overriddenGhostscriptExecutablePath = null)
+    public function __construct(
+        $overriddenGhostscriptExecutablePath = null,
+        $extraGhostscriptArguments = null
+    )
     {
         $this->overriddenGhostscriptExecutablePath = $overriddenGhostscriptExecutablePath;
+        $this->$extraGhostscriptArguments = $extraGhostscriptArguments;
     }
 
     /**
@@ -135,6 +142,10 @@ private function getShellCommand($filePath): string
             $command = $this->overriddenGhostscriptExecutablePath;
         }
 
+        if ($this->extraGhostscriptArguments !== null) {
+            $command .= ' '.$this->extraGhostscriptArguments;
+        }
+
         $command .= ' -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile='.Utils::quote($filePath).' ';
         $command .= implode(' ', $this->arguments);