User:Mike Dillon/Scripts/topicCats.js

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This script lacks a documentation subpage. Please create it.
Useful links: root page • root page’s subpages • links • redirects • your own
var topicCatPageType, topicCatName;
(function () {
    var m = wgPageName.match(/^Template:topic_cat_(parents|description)\//);
    if (!m) return;

    topicCatPageType = m[1];
    topicCatName = wgTitle.split(/\//, 2)[1];
})();

if (wgCanonicalNamespace == 'Category') {
    topicCatName = wgTitle.match(/:/) ? wgTitle.split(/:/, 2)[1] : wgTitle;
    addOnloadHook(function () {
        var tabs = document.getElementById('p-cactions');
        if (!tabs) return;

        var tabList = tabs.getElementsByTagName('ul')[0];
        if (!tabList) return;

        var parentConfigTemplate = 'Template:topic_cat_parents/' + topicCatName;

        var x = sajax_init_object();
        x.open('GET', '/w/api.php?action=query&&format=json&titles=' + encodeURIComponent(parentConfigTemplate), true);
        x.onreadystatechange = function () {
            if (x.readyState != 4 || x.status != 200) return;
            eval('processParentsChecked(' + x.responseText + ')');
        };
        x.send(null);

        function processParentsChecked(json) {
            if (!json.query) return;
            if (!json.query.pages) return;

            var missing = !!(json.query.pages['-1']);

            var url = wgScript + '?action=edit&title=' + encodeURIComponent(parentConfigTemplate);
            if (missing) url += '&preload=Template:topic_cat_parents/preload';

            with (easydom) {
                var tab = li(a({ 'href': url }, 'Parents'));
                if (missing) {
                     tab.className = 'new';
                }
                tabList.appendChild(tab);
            }

            return false;
        }
    });
} else if (topicCatPageType == 'parents') {
    addOnloadHook(function () {
        var tb = document.getElementById('wpTextbox1');
        var diff = document.getElementById('wpDiff');
        var summary = document.getElementById('wpSummary');
        if (!(tb && diff && summary)) return;

        var m = tb.value.match(/\{\{topic cat parents\/helper\|(.*)\|lang=/);
        if (!m) return;

        var declaredParents = m[1].split(/\|/);

        with (easydom) {
            var updateParents = input({ 'type': 'button', 'value': 'Update parents' });
            updateParents.onclick = doUpdateParents;
            diff.parentNode.insertBefore(updateParents, diff.nextSibling);
        }

        function doUpdateParents() {
            var x = sajax_init_object();
            x.open('GET', '/w/api.php?action=query&prop=categories&format=json&titles=' + encodeURIComponent('Category:' + topicCatName), true);
            x.onreadystatechange = function () {
                if (x.readyState != 4 || x.status != 200) return;
                eval('processCategories(' + x.responseText + ')');
            };
            x.send(null);
        }

        function processCategories(json) {
            if (!json.query) return;
            if (!json.query.pages) return;

            var page;
            for (var id in json.query.pages) {
                page = json.query.pages[id];
            }
            if (!page.categories) return;

            var existingParents = page.categories.map(function (e) {
                return e.title.replace(/^Category:/, '');
            });
            if (!existingParents) return;

            var newValue = tb.value.replace(/(\{\{topic cat parents\/helper\|).*(\|lang=)/,
                '$1' + existingParents.join('|') + '$2');
            if (tb.value != newValue) {
                tb.value = newValue;
                summary.value = 'Updated parent categories to: ' + existingParents.join(', ');
                diff.click();
            }

            return false;
        }
    });
}
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