arguments in url question

arguments in url question

[grocery_stocker]

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The following question stems from the following url

http://xahlee.org/emacs/wrap-url.html

The following function on his web page basically makes a url ouf given
a link.

(defun wrap-url-string (url &optional raw)
  "Make the string into a html link.\n
Example:
http://en.wikipedia.org/wiki/Emacs
becomes
<a href=\"http://en.wikipedia.org/wiki/Emacs\">Emacs¨J</a>.
If the url is a wikipedia link, then the link text
is shortened to its title.
If the optional argument raw is not nil, no shortening will happen."
  (require 'gnus-util)
  (let ((linktext url))
    (setq linktext (gnus-url-unhex-string linktext nil))
    (if (and (not raw) (string-match "wikipedia.org" url))
        (progn
          (setq linktext (concat (car (last (split-string linktext
"/"))) "¨J") )
          )
      )
    (concat "<a href=\"" url "\">" linktext "</a>" )
    )
  )

What I don't get is how can a url have optional arguments. I mean
wouldn't something like

¡°http://yahoo.com/news/3829.php¡±

just be passed as one argument to the function i this case?

Re: arguments in url question

[Ben Pfaff]

grocery_stocker <cdalten@gmail.com> writes:

> The following function on his web page basically makes a url ouf given
> a link.
>
> (defun wrap-url-string (url &optional raw)

[...]

> What I don't get is how can a url have optional arguments. 

It's not the URL that has optional arguments in this case.  It's
the wrap-url-string function that has an optional argument.
That's a feature of Emacs Lisp, not a feature of a URL.
-- 
"I admire him, I frankly confess it; and when his time comes
 I shall buy a piece of the rope for a keepsake."
--Mark Twain

Re: arguments in url question

[Chad]

On Mar 16, 8:16 pm, Ben Pfaff <b...@cs.stanford.edu> wrote:
> grocery_stocker <cdal...@gmail.com> writes:
> > The following function on his web page basically makes a url ouf given
> > a link.
>
> > (defun wrap-url-string (url &optional raw)
>
> [...]
>
> > What I don't get is how can a url have optional arguments.
>
> It's not the URL that has optional arguments in this case.  It's
> the wrap-url-string function that has an optional argument.
> That's a feature of Emacs Lisp, not a feature of a URL.
> --
> "I admire him, I frankly confess it; and when his time comes
>  I shall buy a piece of the rope for a keepsake."
> --Mark Twain


So what would be the optional argument in this case?

Re: arguments in url question

[Ben Pfaff]

Chad <cdalten@gmail.com> writes:

> On Mar 16, 8:16 pm, Ben Pfaff <b...@cs.stanford.edu> wrote:
>> grocery_stocker <cdal...@gmail.com> writes:
>> > The following function on his web page basically makes a url ouf given
>> > a link.
>>
>> > (defun wrap-url-string (url &optional raw)
>>
>> [...]
>>
>> > What I don't get is how can a url have optional arguments.
>>
>> It's not the URL that has optional arguments in this case.  It's
>> the wrap-url-string function that has an optional argument.
>> That's a feature of Emacs Lisp, not a feature of a URL.
>
> So what would be the optional argument in this case?

The one named "raw" in the function declaration quoted above.
-- 
Ben Pfaff 
http://benpfaff.org

Re: arguments in url question

[Barry Margolin]

In article <87wso2800g.fsf@blp.benpfaff.org>,
 Ben Pfaff <blp@cs.stanford.edu> wrote:

> Chad <cdalten@gmail.com> writes:
> 
> > On Mar 16, 8:16 pm, Ben Pfaff <b...@cs.stanford.edu> wrote:
> >> grocery_stocker <cdal...@gmail.com> writes:
> >> > The following function on his web page basically makes a url ouf given
> >> > a link.
> >>
> >> > (defun wrap-url-string (url &optional raw)
> >>
> >> [...]
> >>
> >> > What I don't get is how can a url have optional arguments.
> >>
> >> It's not the URL that has optional arguments in this case.  It's
> >> the wrap-url-string function that has an optional argument.
> >> That's a feature of Emacs Lisp, not a feature of a URL.
> >
> > So what would be the optional argument in this case?
> 
> The one named "raw" in the function declaration quoted above.

In other words, you can write

(wrap-url-string "http://en.wikipedia.org/wiki/Emacs")

or

(wrap-url-string "http://en.wikipedia.org/wiki/Emacs" t)

In the latter case, no shortening will be done.

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***