54 lines
1.4 KiB
TypeScript
54 lines
1.4 KiB
TypeScript
import { parse } from "https://deno.land/std@0.195.0/yaml/mod.ts";
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import { join, fromFileUrl } from "https://deno.land/std@0.193.0/path/mod.ts";
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export const PAGES_PATH = join(fromFileUrl(import.meta.url), "../pages.yaml");
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export interface PageDescription {
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name: string;
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description: string;
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}
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async function readPagesDescription() {
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const pagesText = await Deno.readTextFile(PAGES_PATH);
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const pages = parse(pagesText) as PageDescription[];
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return pages;
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}
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function watchFile(
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path: string,
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callback: () => void | Promise<void>,
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) {
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const watcherRef = Deno.watchFs(path);
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(async () => {
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for await (const event of watcherRef) {
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if (event.kind == "modify") {
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await callback();
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}
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}
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})();
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const closeHandler = () => {
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watcherRef.close();
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};
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Deno.addSignalListener("SIGINT", closeHandler);
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return ()=>{
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Deno.removeSignalListener("SIGINT", closeHandler);
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closeHandler();
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}
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}
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let pages_meta: PageDescription[] = [];
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let mtime = 0;
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let lastest_disposer = () => {};
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export async function get_pages_meta(): Promise<[PageDescription[],number]>{
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if (pages_meta.length == 0) {
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pages_meta = await readPagesDescription();
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mtime = Date.now();
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lastest_disposer();
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lastest_disposer = watchFile(PAGES_PATH, async () => {
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pages_meta = await readPagesDescription();
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mtime = Date.now();
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});
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}
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return [pages_meta, mtime];
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}
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