MediaWiki:Standard Edit Summaries.js

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$(function() {

    'use strict';

    var $textarea = $('textarea.oo-ui-inputWidget-input, #wpSummary');

    if (!$textarea.length || document.getElementById('stdSummaries')) return;

    var presets = (window.dev && window.dev.editSummaries) || {},
        select = presets.select || 'Template:Stdsummaries';

    $textarea.attr('tabindex', '3'); //set tabindex for summaries text area
    $('#wpMinoredit').attr('tabindex', '4'); //set tabindex for minor edit checkbox
    $('#wpSave').attr('tabindex', '5'); //set tabindex for publish button

    var $summary = $('#wpSummaryEnhanced');
    if (!$summary.length) $summary = $textarea;

    if ('css' in presets) {
        mw.util.addCSS(presets.css);
    } else {
    }

    var $combo = $('<select id="stdSummaries" tabindex="2"></select>')
    .insertAfter($textarea)
    .change(function() {
        //var val = $summary.val();
        //$summary.val(val + (val.length ? '; ' : '') + $(this).val());
        $summary.val($(this).val());
    });

    function flatten (options, indent) {
        var flattened = [];
        indent = indent || '';
        for (var i = 0; i < options.length; i++) {
            if ($.isArray(options[i])) {
                flattened = flattened.concat(flatten(options[i], '-- '));
            } else {
                flattened.push(indent + options[i]);
            }
        }
        return flattened;
    }

    function render (lines) {
        var options = '', selected = ' selected',
            ignore = { ':': 1, '*': 1,  '<': 1 };
        for (var i = 0; i < lines.length; i++, selected = '') {
            if (!lines[i].length || ignore[lines[i][0]]) {
                continue; // lines beginning with these characters: : * < are ignored
            }
            if (lines[i].substring(0, 3) === '-- ') {
                var contents = mw.html.escape( lines[i].substring(3) );
                options += '<option value="' + contents + '"' +
                    selected + '>&nbsp;&nbsp;' + contents + '</option>';
            } else {
                options += '<option value="" disabled' +
                    selected + '>' + mw.html.escape( lines[i] ) + '</option>';
            }
        }
        $combo.append(options);
    }

    if (typeof select === 'string') {
        $.get(mw.util.getUrl(select, {action: 'raw'}))
        .done(function (data) {
            render(data.split(/\r\n|\n|\r/));
        });
    } else if (Array.isArray(select)) {
        render(flatten(select));
    }
});