⚡ initial

cli.mjs

@@ -0,0 +1,115 @@
+#!/usr/bin/env -S npx nodejsscript
+/* jshint esversion: 11,-W097, -W040, module: true, node: true, expr: true, undef: true *//* global echo, $, pipe, s, fetch, cyclicLoop */
+import { JSDOM } from "jsdom";
+const url_drops= "https://pagenotfound.cz/drop/";
+const { name, version, description }= s.cat("package.json").xargs(JSON.parse);
+/**
+ * @typedef {Object} Article
+ * @property {string} title
+ * @property {string} perex
+ * @property {string} author
+ * @property {string} loc
+ * @property {string} drop
+ * */
+/**
+ * @typedef {Object} Drop
+ * @property {string} drop
+ * @property {string} date
+ * */
+/**
+ * @typedef {Object} Sitemap
+ * @property {Article[]} articles
+ * @property {Drop[]} drops
+ * */
+
+$.api()
+.version(version)
+.describe(description)
+.command("pull", "Update article list")
+.action(async function pull(){
+	const json= await sitemap();
+	toRSS(json);
+	$.exit(0);
+})
+.parse();
+
+/** @param {Sitemap} json */
+async function toRSS(json){
+	const path= "rss.xml";
+	const host= "https://pagenotfound.cz";
+	const articles= json.articles.map(function({ title, perex, author, loc, drop }){
+		return [
+			"<item>",
+			...[
+				`<title>${title}</title>`,
+				`<link>${host+loc}</link>`,
+				`<description>${perex}</description>`,
+				`<author>${author}</author>`,
+				`<pubDate>${json.drops.find(d=> d.drop === drop).date}</pubDate>`,
+				`<category>${drop}</category>`,
+			].map(l=> "\t"+l),
+			"</item>"
+		].map(l=> "\t"+l).join("\n");
+	});
+
+	s.echo([
+		`<?xml version="1.0" encoding="UTF-8" ?>`,
+		`<rss version="2.0">`,
+		"<channel>",
+		`	<title>Pagenotfound.cz</title>`,
+		`	<link>${host}</link>`,
+		...articles,
+		"</channel>",
+		"</rss>"
+	].join("\n")).to(path);
+}
+async function sitemap(){
+	const path= "sitemap.json";
+	
+	/** @type {Sitemap} */
+	const json= s.test("-f", path) ? s.cat(path).xargs(JSON.parse) : { drops: [], articles: [] };
+	const [ article_last= { drop: "" } ]= json.articles;
+	await syncDrops(json);
+	const [ { drop: drop_last } ]= json.drops;
+	if(drop_last === article_last.drop) return json;
+	
+	const res= await fetch(url_drops+drop_last);
+	if(res.status !== 200) return;
+	const dom= new JSDOM(await res.text());
+	const diff= [];
+	for(const article of dom.window.document.querySelectorAll("article")){
+		diff.push({
+			title: article.querySelector("h2").textContent.trim(),
+			perex: article.querySelector("[class^=ArticleTile_perex]").textContent.trim(),
+			author: article.querySelector("[class^=ArticleTile_author]").textContent.trim(),
+			loc: article.querySelector("a").href,
+			drop: drop_last,
+		});
+	}
+
+	json.articles.unshift(...diff);
+	s.echo(JSON.stringify(json, null, "\t")).to(path);
+	return json;
+}
+/** @param {Sitemap} json */
+async function syncDrops(json){
+	const [ { drop: drop_last } ]= json.drops;
+	const i_index= drop_last.search(/\d/);
+	const pre= drop_last.slice(0, i_index);
+	const index= pipe(
+		Number,
+		i=> i+1,
+		i=> i.toString().padStart(drop_last.length - i_index, "0"),
+	)(drop_last.slice(i_index));
+
+	const drop= pre+index;
+	const res= await fetch(url_drops+drop, { method: "HEAD" });
+	if(res.status !== 200) return json;
+
+	const date= pipe(
+		d=> new Date(d),
+		d=> d.toISOString(),
+	)(res.headers.get("date"));
+	json.drops.unshift({ drop, date });
+	return json;
+}