[tor-bugs] #6802 [Tor Client]: Make our config parsing less kludgy

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#6802: Make our config parsing less kludgy
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 Reporter:  nickm        |          Owner:                  
     Type:  enhancement  |         Status:  new             
 Priority:  normal       |      Milestone:  Tor: unspecified
Component:  Tor Client   |        Version:                  
 Keywords:               |         Parent:                  
   Points:               |   Actualpoints:                  
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 If our only configuration types were strings, numbers, booleans, and so
 forth, our existing configuration parsing mechanism would be nifty.  But
 right now, we do entirely too much with STRING, LINELIST, and worst still
 LINELIST_V.

 We've become decent at implementing some patterns to work around this, but
 it would be neat to get much better.

 So as first steps, I suggest that we:
   * Split the parts of the configuration file parsing that handle the
 abstract bits of config_format_t into their own file.
   * Turn config_type_t into an OO thing, so that it's easier to add more.
   * Teach the linelist types and the smartlist types to be a bit smarter
 about what they are lists of, so that every list type doesn't need special
 handling.
   * Make our linelist_v types have an explicit syntax for sections.
   * Implement an additional function to handle the common case of a line
 that has some positional arguments and some k{=v} arguments.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6802>
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