8.2 Prompting for values
prompt-for-form
which accepts an arbitrary Lisp form and optionally evaluates it.(prompt-for-form "Enter a form to evaluate:" :evaluate t)Another useful function is(prompt-for-form "Enter a form to evaluate:" :evaluate nil)
prompt-for-symbol
which prompts the user for an existing symbol. The simplest usage accepts any symbol, as follows:(prompt-for-symbol "Enter a symbol:")If you have a list of symbols from which to choose, then you can pass
prompt-for-symbol
this list with the keyword argument:symbols
. Finally, using:ok-check
you can accept only certain symbols. For example, to only accept a symbol which names a class, use:
(prompt-for-symbol "Enter a symbol:" :ok-check #'(lambda (symbol) (find-class symbol nil)))
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