Handle plaintext and gzipped attachments

mbox2web

@@ -54,8 +54,10 @@ def save_part(msg):
     content_type = msg.get_content_type()
     extension = {
         "application/octet-stream": ".bin",
-        "text/html": ".html",
-        "text/x-vcard": ".vcf",
+        "text/html":                ".html",
+        "text/x-vcard":             ".vcf",
+        "text/plain":               ".txt",
+        "application/x-gzip":       ".gz", # more likely tar.gz, but we can't know without looking into it which we ain't
     }[content_type]
 
     name = msg.get_param("name") or "(data)"
@@ -238,6 +240,9 @@ def render_body(msg):
         }
         bodyhtml = bodytmpl.render(context)
 
+    elif content_type == "application/x-gzip":
+        bodyhtml = save_part(msg)
+
     else:
         raise RuntimeError("Content-type " + content_type + " not implemented yet")