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import * as path from "https://deno.land/std@0.74.0/path/mod.ts";import {  desc,  env,  execute,  glob,  run,  sh,  task,} from "https://deno.land/x/drake@v1.4.4/mod.ts";// } from "../mod.ts";
desc("command-line usage");task("help", [], function () {  console.log(`Example Drakefile illustrating dynamic task creation.
Dynamically create file tasks to compile markdown source files to HTML.Execute them synchronously and asynchronously with 'compile-sync' and'compile-async' tasks respectively.
Example usage:
   deno run -A dynamic-tasks.ts compile-async mdfiles=~/doc/test/*.md outdir=/tmp
Environment variables:
mdfiles=<markdown source files glob>                (default: "*.md")outdir=<output directory for compiled HTML files>   (default: mdfiles directory)
- The 'compile-async' task runs up to 5 times faster than 'compile-sync'.- Increase the maximum number of open file descriptors with ulimit(1) if  there are 'Too many open files (os error 24)'.- Test results compiling 5000 markdown files:
    compile-async: 42.5s (5000 files updated)    compile-async: 0.8s (0 files updated)    compile-sync: 311s (5000 files updated)    compile-sync: 0.8s (0 files updated)
`);});
const tasks: string[] = [];const mdfiles = env("mdfiles") || "*.md";const outdir = env("outdir") || path.dirname(mdfiles);
for (const prereq of glob(mdfiles)) {  let target = `${prereq.replace(/\.[^/.]+$/, "")}.html`;  target = path.join(outdir, path.basename(target));  // Create a file task to compile the markdown source file.  task(target, [prereq], async function () {    await sh(`marked "${prereq}" > "${target}"`);  });  tasks.push(target);}
desc("compile markdown files synchronously");task("compile-sync", tasks);
desc("compile markdown files asynchronously");task("compile-async", [], async function () {  await execute(...tasks);});
await run();