Optional argument in skeleton

[David Arroyo Menendez]

Hi,

Using define-skeleton, I can create a function, such as

(define-skeleton php-ereg
  "Insert an ereg statement"
  ""
  '(setq regexp (skeleton-read "Regexp? "))
  '(setq string (skeleton-read "String? "))
  > "ereg(" regexp ", " string ");"
)

or 

(define-skeleton php-if
  "Insert a if statement"
  ""
  '(setq condition (skeleton-read "Condition? ")) \n
   > "if( " condition " ) {" \n
   > _ \n
   ( "other condition, %s: "
   > -2 "}" \n  
   > "else if( " str " ) {" \n
   > _ \n)
   > -2 "}" \n
   > "else {" \n
   > _ \n
   resume:
   > -2 "}" \n)

In the second function I've an optional part, but it's repeated n
times. I want a method to express a part conditional, but only 1 time.

Some idea?

Kind regards