[WM] Figuring out the order of processing.

[Robert Echlin]

Hi, jlm,

I think most opportunities for self-referential links occur in 
navigation bars.

You might find interesting the nav bar sample I provided in a 
(multiply-sent) message called duplicate code.

As I mentioned in that message, there is code duplicated between the 
sitemapnode and sitemapleaf functions, so the code is not ideal, but it 
eliminates self-referential links in a nav bar.

Robert

jlm17 wrote:

> I'm new to using webmake, and I am trying to create a new tag, <nsrlink> 
> (a non-self-referential link). Useability experts say that web pages 
> shouldn't have links in them to themselves. I want to follow this 
> advice, so I want to be able to do something like this:
> 
> <nsrlink href="index.html">Home</nsrlink>
> 
> instead of:
> 
> <a href="index.html">Home</a>
> 
> and know that if the tag was placed into the index.html file it would 
> not be a link, but if it was placed in any other file it would be.
> 
> Ok, so here is my perl function for doing this:
> 
>     sub nsrlink
>     {
>       my $tag=shift(@_);
>       return("") if($tag ne "nsrlink");
>       my $attributes=shift(@_);
>       my $text=shift(@_);
>       my $this=get_current_main_content();
>       my $url=get_url($this.".html");
>       my $href=${$attributes}{"href"};
>       $href=expand($href);
>       if($url eq $href) { return($text); }
>       else { return("<a href=\"$href\">".$text."</a>"); }
>     }
> 
> The key problem is with that get_current_main_content() function. 
> According to the documentation that function is only guarenteed to be 
> valid if called from within a deferred content reference. I'm about at 
> my wits end trying to get a deferred content reference to then execute 
> some perl code.
> 
> My idea was to have the function called by the custom tag <nsrlink> to 
> write out something like:
> <{set foo="<{perl nsrlink(\"nsrlink\", { \"href\" => \"index.html\" }, 
> \"dud\");}\>"}> $[foo]
> 
> I also tried <wmmeta> instead of <{set}>
> 
> Then the evaluation of $[foo] would be deferred, it resolves to a perl 
> block which is then executed. I can't get this to work. First off, 
> inside the perl block I have quotes. How do I escape them, since quotes 
> delimit the foo="..." stuff? Also It seems that I can't have the '>' in 
> my perl block either, as that makes webmake unable to parse. What I have 
> been doing is backslashing all of these things, but I'm not certian if 
> this is the correct direction to go in.
> 
> Right now this works:
> <{set dud="<{perl nsrlink("nsrlink", { "href" => "index.htm" }, 
> "dud");}>"}> $[dud]
> But I can't get a perl block to output that text.
> 
> I hope I am explaining this clearly. I think what I need is when webmake 
> sees this:
> <nsrlink href="index.html">dud</nsrlink>
> It calls a function which outputs this:
> <{set foo="<{perl nsrlink("nsrlink", { "href" => "index.htm" }, 
> "dud");}>"}> $[foo]
> And when $[foo] is evaluated get_current_main_content() is valid and 
> nsrlink returns the html that I want it to return.
> 
> Is this even possible? I see that the navtree plugin requires that it be 
> added to the html as a deferred content reference.
> 
> Thanks for your time.
> _______________________________________________
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> 

-- 
Robert Echlin
rechlin [at] magma.CA
Personal site: "Some People's Parents" => magma.ca/~rechlin
Company site: OfficeProfessor.CA