Re: pcase on multiple conditions

[Emanuel Berg]

Michael Heerdegen wrote:

>>> Is this the way to test for two values to perform the
>>> same operation?
>>> 
>>>  (pcase complt
>>>     ((or 3 4)
>>>        (myfunc)))
>>
>> With `or' it will become true if any of values is true.
>
> `pcase' patterns are not values. Your interpretation of the
> semantics of this `or` pattern is wrong.

The syntax and semantics are not easy to understand but here
is an example of `pcase' use that should be simple enough, at
least what it does and how to use it.

(defun insert-mail (&optional delim)
  (interactive "P")
  (pcase-let ((`(,delim-beg ,delim-end) (if delim '("<" ">") '("" ""))))
    (insert (format "%s%s%s" delim-beg user-mail-address delim-end)) ))

;; (insert-mail)   ;  incal@dataswamp.org
;; (insert-mail t) ; <incal@dataswamp.org>

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