Template:PreviousNextLinks

// PreviousNextLinks: display links to "previous" and "next" wiki page
//
//    Original by lktest, March 2009
//
//    Updated by neilw, 10/19/2009

// This is just a starting point, still needs fine-tuning, especially w/regard to presentation of the links.

var allowed_keys = [ "name", "title", "id", "uri", "update", "create" ];

// Process args
var sortKey = $0 ?? $key ?? "title";     
var sortOrder = $1 ?? $order ?? false;

// Validate sortKey
if (sortKey is not str || !list.contains(allowed_keys, string.tolower(sortKey))) {
    <span style="font-weight:bold; color:red"> "ERROR: invalid sortkey: "; sortKey; </span>; <br />;
    let sortKey = "title";
}

// Sort the list of pages  
var pages = [
    { name:p.name, title:p.title, id:p.id, uri:p.uri,
      update:date.format(p.date,"s"), create:date.format(p.revisions[0].date,"s") }
    foreach var p in page.parent.subpages ];

let pages = list.sort(pages, sortKey, sortOrder);     

// Find my current position on the list
var position = list.indexof(list.collect(pages, "id"), page.id);            

// Display "previous" link
if (position > 0) {
    "Previous: ";       
    web.link(pages[position-1].uri, pages[position-1].title);     
    <br />;     
}     
// Display "next" link
if (position+1 < #pages) {     
    "Next: ";    
    web.link(pages[position+1].uri, pages[position+1].title);     
}