[tor-bugs] #3163 [Tor Client]: Document that Vidalia relies on the format of the 'tor --version' output

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#3163: Document that Vidalia relies on the format of the 'tor --version' output
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 Reporter:  arma        |          Owner:                  
     Type:  task        |         Status:  new             
 Priority:  normal      |      Milestone:  Tor: unspecified
Component:  Tor Client  |        Version:                  
 Keywords:              |         Parent:                  
   Points:              |   Actualpoints:                  
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 When Vidalia runs Tor, it first starts by running "tor --version", and
 then looking for the first line that starts with the (case-insensitive)
 string "Tor version ". It assumes the text after that string, up until the
 next space character, is Tor's version.

 Should we add that note to the version-spec.txt, to be aware that we
 should try to avoid changing the output format of tor --version? Or is
 there a better place to document it?

 Are there other output formats that external programs rely on?

 (Ticket motivated by #3049 and #3076.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3163>
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