noctbot/commands/aggregators/com3d2_updates.js

const html = require("node-html-parser"); 
const axios = require("axios");
const db = require("../../db.js");

const updatePage = "http://com3d2.jp/update/";
const changeLogPattern = /\[\s*([^\s\]]+)\s*\]\s*((・.*)\s+)+/gim;

function getVersionNumber(verStr) {
    let verPart = verStr.replace(/[\.\s]/g, "");
    if(verPart.length < 4)
        verPart += "0";
    return +verPart;
}

async function aggregate() {
    let lastVersion = db.get("lastCOMJPVersion").value();
    
    try {
        let mainPageRes = await axios.get(updatePage);
        
        if(mainPageRes.status != 200)
            return [];

        let rootNode = html.parse(mainPageRes.data, {
                pre: true,
                script: false,
                style: false
        });

        let readme = rootNode.querySelector("div.readme");

        if(!readme) {
            console.log("[COM3D2 JP UPDATE] Failed to find listing!");
        }

        let latestVersionChangelog = changeLogPattern.exec(readme.text);

        if(!latestVersionChangelog)
            return [];

        let version = getVersionNumber(latestVersionChangelog[1]);
        let text = latestVersionChangelog[0];

        if(version <= lastVersion)
            return [];
        
        db.set("lastCOMJPVersion", version).write();

        return [{
            id: `com3d2-jp-updates-${version}`,
            link: updatePage,
            title: latestVersionChangelog[1],
            author: "COM3D2 UPDATE",
            contents: text,
            embedColor: 0xcccccc
        }];
    } catch(err) {
        return [];
    }
}

module.exports = {
    aggregate: aggregate
};