PageDirectory

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    /***
    
        PageDirectory
            creates a searchable directory of pages organized by tabs and filtered by tags
    
        Arguments:
    
        path : str (optional, default: current page path)
            page path the the parent page where the subpages to be organized are located
    
        most_popular : map (optional, default: none)
            show section for most popular pages that have a given tag
    
            tag : str
                tag to used for the split between left and right columns for most popular;
                left pages have the tag, right pages do not
    
            title : str
                title shown for left column
    
        tabs : list (optional, default: empty list)
            list of maps describing each tab to show; map entries may contain the following fields
    
            label : str
                label for the tab
    
            key : str
                key used to identify the selected tab
    
        featured_limit : num (optional, default: 15)
            number of pages to show in the "Featured" category
    
        cache_prefix : str (optional, default: none)
            when set, caches the page directory for a given view using this key
    
        tag_constraint : str -or- list (optional, default: none)
            only list pages that have all of the specified tags
    
    ***/
    
    // read parameters
    var path = $path ?? page.path;
    var most_popular = $most_popular;
    var tabs = $tabs ?? [ ];
    var featured_limit = $featured_limit ?? 15;
    var cache_prefix = $cache_prefix;
    var tag_constraint = $tag_constraint;
    
    // check how the current page is being invoked
    var query = __request.args.q;
    var view = __request.args.v ?? (query ? 'search' : 'featured');
    
    // define variables
    var render;
    var cache_id;
    var pages;
    var constraint = 'type:wiki AND path:' .. string.searchescape(path) .. '*';
    if(tag_constraint is str) {
        let constraint ..= ' AND tag:"' .. string.escape(tag_constraint) .. '"';
    } else if(tag_constraint is list) {
        let constraint ..= ' AND ' .. string.join([ ' AND tag:"' .. string.escape(tag) .. '"' foreach var tag in tag_constraint where tag is str ], ' AND ');
    }
    
    // check if a search was requested
    if(query) {
        if(path[-1] != '/') {
            let path = path .. '/';
        }
        let pages = wiki.getsearch(query, 1000, _, constraint);
    } else {
        let pages = wiki.getsearch(constraint, 1000);
        if(cache_prefix) {
            let cache_id = cache_prefix .. '-cache-' .. view;
            let render = __env.webcache && webcache.fetch(cache_id);
        }
    }
    
    if(!render) {
        let render = (
    
            // remove pages starting with '*'
            let parent_page = wiki.getpage(path);
            let pages = [ p foreach var p in pages where !string.startswith(p.name, '*') && p.parent.id == parent_page.id ];
    
            // show page count
            <p> wiki.localize("MindTouch.Templates.Controls.PageDirectory.entrycount", [ num.format(#pages, "#,##0") ]) </p>;
            <p> string.nbsp </p>
    
            // show directory based on current views
            <table width="100%" cellspacing="0" cellpadding="0" border="1">
                <tr>
                    <td>
                        if(view == 'featured') {
                            <strong> wiki.localize("MindTouch.Templates.Controls.PageDirectory.viewfeatured") </strong>;
                        } else {
                            web.link(page.uri, wiki.localize("MindTouch.Templates.Controls.PageDirectory.viewfeatured"));
                        }
                    </td>
                    if(#tabs) {
                        foreach(var tab in tabs) {
                            <td>
                                if(view == tab.key) {
                                    <strong> wiki.localize("MindTouch.Templates.Controls.PageDirectory.viewby", [ tab.label ]) </strong>;
                                } else {
                                    web.link(page.uri & { v: tab.key }, wiki.localize("MindTouch.Templates.Controls.PageDirectory.viewby", [ tab.label ]));
                                }
                            </td>
                        }
                    } else {
                        <td>
                            if(view == 'all') {
                                <strong> wiki.localize("MindTouch.Templates.Controls.PageDirectory.viewall") </strong>;
                            } else {
                                web.link(page.uri & { v: 'all' }, wiki.localize("MindTouch.Templates.Controls.PageDirectory.viewall"));
                            }
                        </td>
                    }
                    <td>
                        <form method="get" action=(page.uri)>
                            if(view == 'search') {
                                <strong> wiki.localize("MindTouch.Templates.Controls.PageDirectory.search"); </strong>; 
                            } else {
                                wiki.localize("MindTouch.Templates.Controls.PageDirectory.search");
                            }
                            &nbsp;;
                            <input name="q" type="text" value=(query ?? '') />
                            <input type="submit" value="Go" />
                        </form>
                    </td>
                </tr>
            </table>
    
            switch(view) {
            case 'featured':
    
                // show 'Most Popular' and 'Recently Added' entries
                <table width="100%" cellspacing="0" cellpadding="5" border="0" style="table-layout: fixed;">
                    if(most_popular && most_popular.tag && most_popular.title) {
                        <tr valign="top">
                            <td>
                                <h3> wiki.localize("MindTouch.Templates.Controls.PageDirectory.mostpopularfor", [ most_popular.title ]); </h3>
                                template("MindTouch/Controls/ListPages", { pages: [ p foreach var p in pages where p.tags[most_popular.tag] is not nil ], sort: 'viewcount', reverse: true, limit: featured_limit, style: 'bullets' })
                            </td>
                            <td>
                                <h3> wiki.localize("MindTouch.Templates.Controls.PageDirectory.mostpopularfor", [ xml.text(wiki.localize("MindTouch.Templates.Controls.PageDirectory.other")) ]); </h3>
                                template("MindTouch/Controls/ListPages", { pages: [ p foreach var p in pages where p.tags[most_popular.tag] is nil ], sort: 'viewcount', reverse: true, limit: featured_limit, style: 'bullets' })
                            </td>
                        </tr>
                    } else {
                        <tr valign="top">
                            <td colspan="2">
                                <h3> wiki.localize("MindTouch.Templates.Controls.PageDirectory.mostpopular" ); </h3>
                                template("MindTouch/Controls/ListPages", { pages: pages, sort: 'viewcount', reverse: true, limit: featured_limit, style: 'bullets' })
                            </td>
                        </tr>
                    }
                    <tr valign="top">
                        <td>
                            <h3> wiki.localize("MindTouch.Templates.Controls.PageDirectory.recentlyadded") </h3>
                            template("MindTouch/Controls/ListPages", { pages: pages, sort: 'created', reverse: true, limit: featured_limit, style: 'bullets' })
                        </td>
                        <td>
                            <h3> wiki.localize("MindTouch.Templates.Controls.PageDirectory.recentlyupdated") </h3>
                            template("MindTouch/Controls/ListPages", { pages: pages, sort: 'updated', reverse: true, limit: featured_limit, style: 'bullets' })
                        </td>
                    </tr>
                </table>
    
            case 'all':
    
                <h3> wiki.localize("MindTouch.Templates.Controls.PageDirectory.directoryfor", [ string.tocamelcase(view) ]) </h3>
                template("MindTouch/Controls/ListPages", { pages: pages, sort: 'title' });
    
            case 'search':
        
                <h3> wiki.localize("MindTouch.Templates.Controls.PageDirectory.searchresults") </h3>
                template("MindTouch/Controls/ListPages", { pages: pages, sort: 'viewcount', reverse: true });
            default:
        
                <h3> wiki.localize("MindTouch.Templates.Controls.PageDirectory.directoryfor", [ string.tocamelcase(view) ]) </h3>
                template("MindTouch/Controls/TagDirectory", { pages: pages, tagprefix: view, columns: 3, listpagesoptions: { sort: 'title', reverse: false } })
            }
    
            <br/><hr/><br/>
        );
        if(cache_id && __env.webcache) {
            webcache.store(cache_id, render);
        } else {
            render;
        }
    } else {
        render;
    }