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import path from "path";
import fs from "fs";
import { Feed, PageDirectory } from "./pageDirectory.js";
import { logger } from "../logger.js";
export async function discoverFeed(feed: Feed, pageDirectory: PageDirectory): Promise<boolean> {
const entries = [];
const titleConfigPath = feed.paramStrategy?.title?.from || "title";
const updatedConfigPath = feed.paramStrategy?.date?.from || "date";
const descriptionConfigPath = feed.paramStrategy?.description?.from || "description";
//todo support actual discovery strategies
for (const page of pageDirectory.getPagesBeginningWith(feed.route)) {
if (page.name === 'index') {
continue;
}
const entry = {
title: page.config[titleConfigPath] || page.name,
updated: page.config[updatedConfigPath] || new Date(0),
id: page.name,
url: `${feed.url}/${page.name}`,
description: page.config[descriptionConfigPath] || "",
// description: page.html?.length > 100 ? `${page.html?.substring(0, 100)}...` || "" : page.html || "",
};
entries.push(entry);
}
feed.entries = entries;
feed.entries.sort((a, b) => b.updated.getTime() - a.updated.getTime());
feed.updated = new Date(0);
for (const entry of feed.entries) {
if (entry.updated > feed.updated) {
feed.updated = entry.updated;
}
}
const atomFeed = `<feed xmlns="http://www.w3.org/2005/Atom">
<title>${feed.title}</title>
<updated>${feed.updated.toISOString()}</updated>
<link rel="self" href="${feed.url}/atom.xml" type="application/atom+xml"/>
<link rel="alternate" href="${feed.url}" type="text/html"/>
${feed.entries
.map((entry) => {
return `<entry>
<title>${entry.title}</title>
<updated>${entry.updated.toISOString()}</updated>
<id>${entry.id}</id>
<link rel="alternate" href="${entry.url}" type="text/html"/>
<summary>${entry.description}</summary>
</entry>`;
})
.join("\n")}
</feed>`;
try {
const file = feed.buildPath;
const dir = path.dirname(file);
if (!fs.existsSync(dir)) {
fs.mkdirSync(dir, { recursive: true });
}
fs.writeFileSync(file, atomFeed);
} catch (e) {
logger.error(`Failed to write feed ${feed.buildPath}: ${e.message}`);
return false;
}
}
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