feat: 新增 wikihow/正版中国 (#2679)

* feat: 新增 wikihow/正版中国/小众软件

* 移除 小众软件

lib/routes/getitfree/utils.js

@@ -0,0 +1,47 @@
+const cheerio = require('cheerio');
+
+const getDeadlineStr = ($, countDownNodeSelector) => {
+    const countDownNode = $(countDownNodeSelector);
+    let deadlineStr = '';
+    if (countDownNode.text().includes('活动已经结束')) {
+        return '截至日期: 活动已经结束';
+    }
+    const countdownCodeStr = countDownNode.children('script').html() || '';
+    const arr = /ShowCountDown\("\d*"\s*,\s*([\d,]+)\s*\)/.exec(countdownCodeStr.trim());
+    if (arr) {
+        const dateStr = arr[1].replace(/,/g, (...args) => {
+            const index = args[args.length - 2];
+            return index === 10 ? ' ' : index < 10 ? '-' : ':';
+        });
+        deadlineStr = `截至日期: ${new Date(dateStr).toUTCString()}`;
+    }
+    return deadlineStr;
+};
+
+const parseListItem = ($, listSelector) =>
+    $(`${listSelector} .content-box`)
+        .map((_, ele) => {
+            const $item = cheerio.load(ele);
+            const infoNode = $item('.posts-default-title > h2 > a');
+            const title = infoNode.attr('title');
+            const link = infoNode.attr('href');
+            const pubDateStr = $item('.posts-default-info .icon-time').text();
+            const pubDate = new Date(pubDateStr).toUTCString();
+            const thumbnail = $item('.posts-default-img img').attr('data-original');
+            const deadlineStr = getDeadlineStr($item, '.countDownCont');
+            const digest = $item('.posts-default-content > .posts-text')
+                .text()
+                .trim();
+            return {
+                title,
+                link,
+                pubDate,
+                description: [title, deadlineStr, digest, `<img src="${thumbnail}"/>`].filter((str) => !!str).join('<br/>'),
+            };
+        })
+        .get();
+
+module.exports = {
+    getDeadlineStr,
+    parseListItem,
+};