RFC: make "--html-extension" a default for "wget -r -k".

Hi!

RFC: make "--html-extension" a default for "wget -r -k".

I used wget to download some pages from a PHP site using parameters with
"wget
-r -k" but without "--html-extension". wget did correctly save a page like
"http://www.XXX.de/view.php?page=a.html"; as a file
"www.XXX.de/view.php?page=a.html".

But if this html page is href'ed from any other html page, then I ran into
problems. The resulting url was something like <a
href="view.php?page=a.html">aa</a>. This href does not work, when
  
  (a) put on a (non-php) web server (because the web server will try to
      deliver view.php instead of "view.php?page=a.html")

  (b) used by a browser from the local disk with "file:///...", because of
the
      same reason than (a) (see rfc2396, section 3.3)

Giving the option "--html-extension" did solve this problem by escaping
the
reserved characters (e.g. "?" and "="), but this is hard to find out.

So "wget -r -k" is totally useless without "--html-extension" at least
when
the downloaded filenames contain reserved characters.

I would like to make "--html-extension" the default, if "-k" and "-r" are
given. What do you think?

If you don't like this, then we should at least print out an error message
saying something like:

  "the downloaded filenames contained reserved characters like '?'. Please
  rerun the program with '--html-extension' otherwise the downloaded pages
  will be useless."

if we detect a filename containing a reserved character and no
"--html-extension" was given.

What do you think?

Till

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