Fix validate_formats to accept Path object for pdf (#338)

pypandoc/__init__.py

@@ -303,8 +303,16 @@ def _validate_formats(format, to, outputfile):
     if base_to_format == "pdf":
         # pdf formats needs to actually have a to format of latex and a
         # filename with an ending pf .pdf
-        if outputfile[-4:] != ".pdf":
-            raise RuntimeError('PDF output needs an outputfile with ".pdf" as a fileending.')
+        if isinstance(outputfile, str):
+            if outputfile[-4:] != ".pdf":
+                raise RuntimeError(
+                    'PDF output needs an outputfile with ".pdf" as a fileending.'
+                )
+        elif isinstance(outputfile, Path):
+            if outputfile.suffix != ".pdf":
+                raise RuntimeError(
+                    'PDF output needs an outputfile with ".pdf" as a fileending.'
+                )
         # to is not allowed to contain pdf, but must point to latex
         # it's also not allowed to contain extensions according to the docs
         if to != base_to_format:

tests.py

@@ -565,11 +565,15 @@ def f():
 
         # outputfile needs to end in pdf
         with closed_tempfile('.WRONG') as file_name:
-            def f():
+            def str_filename():
                 pypandoc.convert_text('# some title\n', to='pdf', format='md', outputfile=file_name)
 
+            def path_filename():
+                pypandoc.convert_text('# some title\n', to='pdf', format='md', outputfile=Path(file_name))
+
             with self.assertRaisesRegex(RuntimeError, 'PDF output needs an outputfile with ".pdf" as a fileending'):
-                f()
+                str_filename()
+                path_filename()
 
         # no extensions allowed
         with closed_tempfile('.pdf') as file_name: