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import { join, relative, walk } from "./deps.ts";import { logger } from "./logger_util.ts";
export async function checkStaticDir(dir: string): Promise<boolean> {  try {    const stat = await Deno.lstat(dir);    if (stat.isDirectory) {      logger.info(`Using "${dir}" as static directory`);      return true;    } else {      logger.warn(`Error: "${dir}" is not directory`);      return false;    }  } catch (e) {    if (e.name === "NotFound") {      logger.info(`No static dir "${dir}"`);      return false;    }    logger.error(e);    return false;  }}
type GenerateStaticAssetsOptions = {  distPrefix: string;};
export async function* generateStaticAssets(  dir: string,  opts: GenerateStaticAssetsOptions,): AsyncIterable<File> {  if (!await checkStaticDir(dir)) {    return;  }
  for await (const entry of walk(dir)) {    if (!entry.isDirectory) {      yield createStaticAssetFromPath(entry.path, dir, opts.distPrefix);    }  }}
export async function* watchAndGenStaticAssets(  dir: string,  opts: GenerateStaticAssetsOptions,): AsyncIterable<File> {  if (!await checkStaticDir(dir)) {    return;  }
  for await (const entry of walk(dir)) {    if (!entry.isDirectory) {      yield createStaticAssetFromPath(entry.path, dir, opts.distPrefix);    }  }
  for await (const e of Deno.watchFs(dir)) {    for (const path of e.paths) {      // TODO(kt3k): Make this concurrent      try {        const stat = await Deno.lstat(path);        if (stat.isDirectory) {          continue;        }        yield await createStaticAssetFromPath(path, dir, opts.distPrefix);      } catch (e) {        logger.error(e);      }    }  }}
async function createStaticAssetFromPath(  path: string,  root: string,  distPrefix: string,): Promise<File> {  logger.debug("Reading", path);  const bytes = await Deno.readFile(path);  return Object.assign(new Blob([bytes]), {    name: join(distPrefix, relative(root, path)),    lastModified: 0,  });}