Re: operations on path lists

[Samuel Wales <samologist@gmail.com>]

thanks.  i was aware that emacs lisp can do that find.  i was trying
to be clear about the origin of the path list, so as to help motivate
the example of a set of lines that, in the case i was omst interested
in, were fs paths.

also, i put in the sort, but could hae left it out for better
generality.  but the find could be much more complex and part of
something that naturally occurs while using the shell in shell mode,
and further processing like deleting lines can be done.  the point i
was trying to make is that i have a set of lines.  and the sub-case of
lines that are paths is what i was most interested in.

and the problem is one of distinguishing the lines so that there is
more clarity for the user.  and possibly shortcutting.

in other words, i was not asking about find, but about the path lists.
:]  but thank you for the find code.  :]


On 2/4/23, Jean Louis <bugs@gnu.support> wrote:
> * Emanuel Berg <incal@dataswamp.org> [2023-02-04 17:55]:
>> Jean Louis wrote:
>>
>> > (cond ((file-directory-p file) (expand-file-name file))
>> >       (t nil))
>>
>> (when (file-directory-p file)
>>   (expand-file-name file) )
>
> I am aware of it, I prefer using `cond' as I get more clarity.
>
> You may get more clarity with `when'.
>
> Btw. it reminds me that I also have `rcd-unless':
>
> (defmacro rcd-unless (condition &optional message &rest body)
>   (declare (indent 2))
>   `(cond (,condition
> 	  ,@body)
> 	 (t (rcd-message ,message))))
>
> So I use it this way:
>
> (rcd-unless nil
>     "Cannot execute"
>   (message "OK I execute"))
>
> I am not sure if I will keep it, but I like it. `rcd-message' you can
> replace with `message' to understand it.
>
> As often I have situation where in the `unless' condition I want to tell to
> user "why" it does not work. So message is displayed in mini buffer.
>
>
> --
> Jean
>
> Take action in Free Software Foundation campaigns:
> https://www.fsf.org/campaigns
>
> In support of Richard M. Stallman
> https://stallmansupport.org/
>
>


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