User:WhitePhosphorus/js/DetectDeleteReasons.js

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// Not completed; do not use it.
(function($, mw) {

'use strict';

if (mw.config.get('wgAction') != "delete") return;

var $reason = $('#wpReason');
if (!$reason.length) return;

// Empty the default reasons.
if (/^内容为：/.test($reason.val())) {
	$reason.val("");
}

// Do not modify customized reasons -- usu. included in URL.
if ($reason.val().length) return;

// Capture the title.
var $page = $('#contentSub > a');
if (!$page.length) return;
var title = $page.text();

// Query content of the page.
$.ajax({
	url: mw.util.wikiScript('api'),
	data: {
		action: 'query',
		prop: 'revisions',
		titles: title,
		rvprop: 'content',
		format: 'json'
	}
}).done(function(data) {
	var content = null;
	if (data.query) {
		if (data.query.pages) {
			for (var id in data.query.pages) {
				if (data.query.pages[id]) {
					var page = data.query.pages[id];
					if (page.revisions && page.revisions.length) {
						if (page.revisions[0]['*']) {
							content = page.revisions[0]['*'];
						}
					}
				}
			}
		}
	}
	if (content !== null) {
		// Is there csd templates?
		// Not support all redirects of Template:Delete.
		// Only capture the first parameter.
		// TODO: links or templates included in parameters.
		var csdTemplates = /{{\s*(delete|db?|c?sd)\s*\|(bot=Jimmy-bot\|)?\s*([^|}]*)/i;
		var rst = csdTemplates.exec(content);
		if (rst !== null) {
			var code = rst[3].toUpperCase();
			if (/^[AGFOR]\d+$/.test(code)) {
				var value = '['+'[WP:CSD#' + code + '|' + code + ']]';
				var $value = $("#wpDeleteReasonList option[value^='" + value + "']");
				if ($value.length > 0) {
					// Yeah we've got it
					$value.prop('selected', true);
					return;
				}
			}
			// Not a standard CSD reason; load it in the textbox.
			$reason.val(code);
			return;
		}
		// not mandarin, G14
		if (/{{\s*(notmandarin|notchinese|非中文)\s*\|/i.test(content)) {
			$("#wpDeleteReasonList option[value^='[[WP:CSD#G14|G14]]']").prop('selected', true);
		}
		// TODO: maybe afd?
	}
});

})(jQuery, mw);