Re: defcustom: order matters in `choice' with value-to-internal

[Andreas Schwab]

Reiner Steib <address@hidden> writes:

> consider these two defcustoms, which only differ in the order of the
> choice elements:
>
> (defcustom rs-test-1
>   "^From:\\|^Newsgroups:\\|^Subject:"
>   "doc string 1, list of regexps, regexp or nil"
>   :type '(choice
>         (const nil :tag "Use gnus-ignored-headers")
>         regexp
>         (repeat :value-to-internal (lambda (widget value)
>                                      (custom-split-regexp-maybe value))
>                 :match (lambda (widget value)
>                          (or (stringp value)
>                              (widget-editable-list-match widget value)))
>                 regexp)))
>
> (defcustom rs-test-2
>   "^From:\\|^Newsgroups:\\|^Subject:"
>   "doc string 2, list of regexps, regexp or nil"
>   :type '(choice
>         (repeat :value-to-internal (lambda (widget value)
>                                      (custom-split-regexp-maybe value))
>                 :match (lambda (widget value)
>                          (or (stringp value)
>                              (widget-editable-list-match widget value)))
>                 regexp)
>         (const nil :tag "Use gnus-ignored-headers")
>         regexp))

Order generally matters, the first matching choice is used.  There is
nothing else that favors the repeat over regexp.

Andreas.

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Andreas Schwab, SuSE Labs, address@hidden
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