Example usage for piping output of one command into the input of a cliffy CLI command

[grempe]

I'd like to be able to pipe the STDOUT of a unix command into the STDIN of a cliffy CLI command. Can you provide an example of how to do so?

The experience I am looking for would allow for usage like:

# mycommand receives STDIN directly and can store and use it
cat filename.txt | mycli mycommand

# mycommand, with a sub-command called '-' receives STDIN directly and can store and use it
cat filename.txt | mycli mycommand -

# mycommand, with a flag called '--stdin' receives STDIN directly and can store and use it
cat filename.txt | mycli mycommand --stdin

Thanks

[c4spar]

This is nothing cliffy specific but here is an example how you could do this:

import { Command } from "https://deno.land/x/cliffy@v0.18.2/command/mod.ts";

await new Command()
  .option("--stdin", "read from stdin")
  .arguments("[path]")
  .action(async ({ stdin }, path: string) => {
    if (stdin || path === "-") {
      await Deno.copy(Deno.stdin, Deno.stdout);
    } else {
      const file = await Deno.open(path);
      await Deno.copy(file, Deno.stdout);
      file.close();
    }
  })
  .parse();

I think I will add some real world examples when I update the documentation.

[grempe]

Awesome, thanks for that example. Very helpful. I'll give it a go tomorrow.

Cheers!