Here's what I want to do...
When an email with a known subject, or from a known source, is viewed I want a button that will:
- Add data from the email (could just regex parse) to a new row in the Google Spreadsheet
- Send a reply to an email address within the original message's body, using a template ('Canned response'), filling in variables on the template from data in the original email AND prompting me for some values
If the add-in to implement this doesn't exist, is it possible using the GMail widgets or some other development kit?