// Modified version of https://github.com/Kriegslustig/showdown-footnotes

/*! showdown-prettify 06-01-2016 */
(function (extension) {
    'use strict';

    if (typeof showdown !== 'undefined') {
        extension(showdown);
    } else if (typeof define === 'function' && define.amd) {
        define(['showdown'], extension);
    } else if (typeof exports === 'object') {
        module.exports = extension(require('showdown'));
    } else {
        throw Error('Could not find showdown library');
    }

}(function (showdown) {
    'use strict';
    showdown.extension('footnotes', function () {
        return [{
            type: 'lang',
            filter: function filter(text) {
                return text.replace(/\[\^([\d\w]+)\]:\s*((\n+(\s{2,4}|\t).+)+)/mgi, function (str, name, rawContent, _, padding) {
                    let content = converter.makeHtml(rawContent.replace(new RegExp(`^${padding}`, 'gm'), ''));
                    return `<a class="blog-anchor" id="footnote-${name}"></a><div class="footnote">[${name}]:${content}</div>`;
                });
            }
        }, {
            type: 'lang',
            filter: function filter(text) {
                return text.replace(/\[\^([\d\w]+)\]:( |\n)((.+\n)*.+)/mgi, function (str, name, _, content) {
                    return `<a class="blog-anchor" id="footnote-${name}"></a><small class="footnote"><a href="#footnote-reference-${name}">[${name}]</a>: ${content}</small>`;
                });
            }
        }, {
            type: 'lang',
            filter: function filter(text) {
                return text.replace(/\[\^([\d\w]+)\]/mgi, function (str, name) {
                    return `<a class="blog-anchor" id="footnote-reference-${name}"><a href="#footnote-${name}"><sup>[${name}]</sup></a>`;
                });
            }
        }];
    });
}));

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