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gnus: Extended Interactive

 
 11.7.7 Extended Interactive
 ---------------------------
 
 Gnus extends the standard Emacs ‘interactive’ specification slightly to
 allow easy use of the symbolic prefix (Symbolic Prefixes).
 Here’s an example of how this is used:
 
      (defun gnus-summary-increase-score (&optional score symp)
        (interactive (gnus-interactive "P\ny"))
        ...
        )
 
    The best thing to do would have been to implement ‘gnus-interactive’
 as a macro which would have returned an ‘interactive’ form, but this
 isn’t possible since Emacs checks whether a function is interactive or
 not by simply doing an ‘assq’ on the lambda form.  So, instead we have
 ‘gnus-interactive’ function that takes a string and returns values that
 are usable to ‘interactive’.
 
    This function accepts (almost) all normal ‘interactive’ specs, but
 adds a few more.
 
 ‘y’
      The current symbolic prefix—the ‘gnus-current-prefix-symbol’
      variable.
 
 ‘Y’
      A list of the current symbolic prefixes—the
      ‘gnus-current-prefix-symbol’ variable.
 
 ‘A’
      The current article number—the ‘gnus-summary-article-number’
      function.
 
 ‘H’
      The current article header—the ‘gnus-summary-article-header’
      function.
 
 ‘g’
      The current group name—the ‘gnus-group-group-name’ function.
 

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