code shifted from custom script to py file

cgi-bin/core/doctype/event/event.js

@@ -0,0 +1,9 @@
+cur_frm.cscript.onload = function(doc, cdt, cdn) {
+  var df = get_field('Event', 'Intro HTML', doc.name);
+  if(doc.ref_type) {
+    ref = repl(cur_frm.cstring.ref_html, {'dt': doc.ref_type, 'dn':doc.ref_name});
+  } else var ref = '';
+     
+  df.options = repl(cur_frm.cstring.intro_html, {'ref': ref});
+  refresh_fields('Intro HTML');
+}

cgi-bin/core/doctype/file/file.py

@@ -0,0 +1,14 @@
+class DocType:
+  def __init__(self, d, dl):
+    self.doc, self.doclist = d,dl
+
+  def validate(self):
+    # check for extension
+    if not '.' in self.doc.file_name:
+      msgprint("Extension required in file name")
+      raise Exception
+
+    # set mime type
+    if not self.doc.mime_type:
+      import mimetypes
+      self.doc.mime_type = mimetypes.guess_type(self.doc.file_name)[0] or 'application/unknown'