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#### 11.7.7 Extended Interactive

Gnus extends the standard Emacs `interactive` specification slightly to allow easy use of the symbolic prefix (see 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.