Re: [PATCH] lisp/files.el: Add `file-name-set-extension`

[Andreas Schwab]

On Mai 25 2021, Colin Woodbury wrote:

> diff --git a/lisp/files.el b/lisp/files.el
> index 62e1702fdf..f8aefa7930 100644
> --- a/lisp/files.el
> +++ b/lisp/files.el
> @@ -4889,6 +4889,20 @@ extension, the value is \"\"."
>          (if period
>              "")))))
>  
> +(defun file-name-set-extension (filename extension)
> +  "Change the extension of a FILENAME to EXTENSION.
> +Sanitizes the input to consolidate leading/trailing dots.
> +
> +Returns `nil' if either of the FILENAME or EXTENSION are `nil'
> +before sanitizing, or empty afterwards."
> +  (when (and filename extension)

What is the use-case for nil?

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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