[Chicken-janitors] #323: Have a logger-like warning precedence concept

[Chicken Trac]

#323: Have a logger-like warning precedence concept
-------------------------------+--------------------------------------------
 Reporter:  kon                |       Owner:       
     Type:  enhancement        |      Status:  new  
 Priority:  not urgent at all  |   Milestone:  4.6.0
Component:  core libraries     |     Version:  4.5.x
 Keywords:                     |  
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 - level is a symbol or #f, indicating lower than the lowest level

   (message-levels [levels]) -> level

     - parameter that gets/sets the active message levels

     - levels is a list of symbol defining the legal set of levels
     and the order of precedence. () means no levels

   (message-level [level]) -> level

     - parameter that gets/sets the active message level

     - the active message level determines whether a message
     is processed any further. any message with a level lower
     than the current level is ignored.

   (message level msg . args)

     - msg is a string, and args are objects

     - a level of #f will never be seen unless () = (message-levels)

   (warning msg . args) & (##sys#notice msg . args)

     - wrappers around `message'

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Ticket URL: <http://bugs.call-cc.org/ticket/323>
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