[pmwiki-users] (:if exists PageName#from#to:)

[JB]

I see that we now have a way to tell if a page exists.

   (:if exists PAGENAME:)

Can it also determine if a/an from/to anchor exists?

   (:if exists PageName#from#:)
   (:if exists PageName#from#to:)
   (:if exists PageName##to:)
   (:if exists PageName#from:)
  
Or even Lines?

   (:include PageName lines=10:)
   (:include PageName lines=5..10:)
   (:include PageName lines=5..:)

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Seems like this can be a pathway to allow verification that 
an included page/page section exists and to allow an
error message to be displayed.

Maybe it could say "the page exists but the lines "17-23" do not exist",
or maybe "the page exists but the anchor "from" does not exist,


  http://www.pmwiki.org/wiki/PITS/00652

Add capability to display error message when an include fails.

Something like:

   Include failure:  "(:include PageName:)" 
   check to see if the page exists and that you
   have the proper access/password to it.

Admins could turn this on in the local/config.php file.

# set $DisplayIncludeErrors to 'on' if you want
# an error message displayed when an include fails
# default value is "off"
#$DisplayIncludeErrors='on';