Re: [sup-talk] Ruby question: before-add-message.rb and adding multiple labels at once

[Eric Sherman <hyperbolist@gmail.com>]

Excerpts from Gregor Hoffleit's message of Wed Jan 13 08:13:18 -0500 2010:
> In order to keep before-add-message.rb readable, I was using one-line
> filters like:
> 
>     message.add_label "ad apple" if message.from.email =~ /@insideapple.apple.com/
>     message.add_label "ad amazon" if message.from.email =~ /promotion.*@amazon.com/
>     message.add_label "list sup" if message.subj =~ /\[sup-talk\]/
>     message.add_label "list sup-devel" if message.subj =~ /\[sup-devel\]/
> 
> That seemed to work, somehow. Only now I realized that message.add_label
> in fact only takes a single label as argument.
> 
> Is it true that I have to change the above syntax into the much more
> verbose:
> 
>     if message.subj =~ /\[sup-devel\]/
>     message.add_label :list
>     message.add_label :"sup-devel"
>     end
> 
> Removing a message from the inbox ("message.remove_label :inbox") while
> applying a label leads to a similar 'code bloat'.

You could try this:
[:list, :sup-devel].each { |l| message.add_label l } if condition
[:inbox, :unread].each { |l| message.remove_label l } if condition

Or something like this:
case [message.from, message.subj].flatten.to_s
  when /foo/ then
    [:label1, :label2].each { |l| message.add_label l }
    [:inbox, :unread].each { |l| message.remove_label l }
  when /bar/ then
    [:label3, :label4].each { |l| message.add_label l }
    [:inbox, :unread].each { |l| message.remove_label l }
end
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