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import { debounce, extname, parseYaml } from "./../deps.ts";import { renderHtml } from "./../render_html.ts";import { ConfigObject } from "./../types.ts";
const usage = `denote serve <filename>
  Runs local server without creating any files.
Example:  denote serve ./denote.yml
  The input should be YAML or JSON file.
Options:  -p, --port <port:number>  Specifies the port to local server. Default is 8080.  -w, --watch               Restarts the local server when the source file is updated.  -h, --help                Shows the help message.`.trim();
function error(str: string): void {  console.error("\nError: " + str);}
export async function serve({  debug,  help,  port,  filename,  watch,}: {  debug: boolean;  help: string;  port: string;  filename: string;  watch: boolean;}) {  if (debug) {    console.log({      debug,      help,      port,      filename,      watch,    });  }
  if (help) {    console.log(usage);    return 0;  }
  if (!filename) {    console.log(usage);    error("source file is required");    return 1;  }  if (![".yaml", ".yml", ".json"].includes(extname(filename))) {    console.log(usage);    error("invalid file is passed as an argument");    return 1;  }  if (!/^[1-9]\d*$/.test(port)) {    console.log(usage);    error("invalid port number is detected");    return 1;  }
  if (watch) {    await runServerWithWatching(filename, Number(port), { debug });  } else {    await runServer(filename, Number(port), { debug });  }  return 0;}
let html = "";async function runServer(  source: string,  port: number,  { debug = false } = {},) {  const config = parseYaml(Deno.readTextFileSync(source)) as ConfigObject;  html = renderHtml(config, debug);  console.log(    `HTTP webserver running. Access it at: http://localhost:${port}/`,  );  const headers = new Headers({ "content-type": "text/html" });  for await (const conn of Deno.listen({ port })) {    (async () => {      for await (const { respondWith } of Deno.serveHttp(conn)) {        respondWith(new Response(html, { status: 200, headers }));      }    })();  }}
// [Build a live reloader and explore Deno! 🦕 - DEV Community](https://dev.to/otanriverdi/let-s-explore-deno-by-building-a-live-reloader-j47)// https://github.com/denoland/deployctl/blob/main/src/subcommands/run.tsexport async function runServerWithWatching(  source: string,  port: number,  { interval = 300, debug = false } = {},) {  runServer(source, port, { debug });
  const watcher = Deno.watchFs(source);
  const rebuild = debounce(() => {    console.log("File change detected");    console.log("Rebuilding...");    const config = parseYaml(Deno.readTextFileSync(source)) as ConfigObject;    html = renderHtml(config, debug);    console.log("Local server is updated");    console.log("Watching for changes...");  }, interval);
  console.log("Watching for changes...");  for await (const event of watcher) {    if (event.kind !== "modify") {      continue;    }    rebuild();  }}