added language for multiline code

.gitignore

@@ -8,3 +8,4 @@
 /MANIFEST
 /venv
 build/
+.vscode/settings.json

markdownify/__init__.py

@@ -76,6 +76,7 @@ class MarkdownConverter(object):
         strong_em_symbol = ASTERISK
         sub_symbol = ''
         sup_symbol = ''
+        language = None
 
     class Options(DefaultOptions):
         pass
@@ -324,7 +325,10 @@ class MarkdownConverter(object):
     def convert_pre(self, el, text, convert_as_inline):
         if not text:
             return ''
-        return '\n```\n%s\n```\n' % text
+        if not self.options['language']:
+            return '\n```\n%s\n```\n' % text
+        else:
+            return f'\n```{self.options["language"]}\n%s\n```\n' % text
 
     convert_s = convert_del
 

tests/test_conversions.py

@@ -210,3 +210,7 @@ def test_sub():
 def test_sup():
     assert md('<sup>foo</sup>') == 'foo'
     assert md('<sup>foo</sup>', sup_symbol='^') == '^foo^'
+
+def test_lang():
+    assert md('<pre>test\n    foo\nbar</pre>',language='python') == '\n```python\ntest\n    foo\nbar\n```\n'
+    assert md('<pre><code>test\n    foo\nbar</code></pre>',language='javascript') == '\n```javascript\ntest\n    foo\nbar\n```\n'