Update postmangler.py

Improve NZB generation by using pretty printing, better readability + compatibility

newsmangler/postmangler.py

@@ -435,9 +435,27 @@ def generate_nzb(self):
                 )
                 segment.text = str(article.headers['Message-ID'][1:-1])
 
+        # pretty print
+        def indent(elem, level=0):
+            i = "\n" + level*"  "
+            if len(elem):
+                if not elem.text or not elem.text.strip():
+                    elem.text = i + "  "
+                if not elem.tail or not elem.tail.strip():
+                    elem.tail = i
+                for elem in elem:
+                    indent(elem, level+1)
+                if not elem.tail or not elem.tail.strip():
+                    elem.tail = i
+            else:
+                if level and (not elem.tail or not elem.tail.strip()):
+                    elem.tail = i
+
+
         with open(filename, 'wb') as nzbfile:
+            indent(root)
             ET.ElementTree(root).write(nzbfile, xml_declaration=True)
-
+            
         self.logger.info('End generation of %s', filename)
 
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