Support shebangs

[ry]

Fixes #929

[kitsonk]

I suspect this is going to need an integration test and more changes as TypeScript doesn't like files without extensions.

[piscisaureus]

Lgtm

[ry]

@kitsonk probably right - but initial tests worked. We can nail down further problems as they arise.

[kuboon]

how can I use this feature?

[kitsonk]

There is nothing you need to do to use the feature. Source files are stripped of shebangs before they are used.

[tracker1]

The following doesn't work... file test.ts

#!/usr/bin/env deno

console.log("test");

run via chmod +x ./test.ts then ./test.ts

[tracker1]

Okay, looks like I need...

#!/usr/bin/env -S deno -q run
// deno-language: ts

console.log("test");

without a file extension...

[aiotter]

@tracker1 You were telling incorrect information.
I greped all the source codes in this repo and found no deno-language option.
What made you write // deno-language: ts?

I wrote the following code and save it as denotest to get a parse error:

#!/usr/bin/env -S deno -q run
// deno-language: ts

function echo(input: string) {
  console.log(input);
}

echo("Hello, world!");

Renaming denotest to denotest.ts fixed it.

To my understanding, deno currently has no option to run a extension-less interpreter files written in TS.
See ongoing discussion at #5088.

[aiotter]

Oh wait, I found @tracker1 edited this Stack Overflow post to show the incorrect information there: https://stackoverflow.com/posts/63044107/revisions

Please don't do this! Check your knowledge before you teach someone.
I strongly recommend you re-editing the post so that they won't waste their time.
I tried to send an edit request, but I wasn't able to because suggested edit queue was already full.

It seems @martin-braun is one of the victims (denoland/vscode_deno#475 (comment)).

[martin-braun]

@aiotter Thanks for mentioning me and reminding me about that. I previously found #5088 and learned that it is not implemented yet, but I forgot to edit my issue on vscode_deno. I edited my GitHub issue and I also removed the misinformation from dwmorrin's answer at StackOverflow to prevent further confusion in the community.

[aiotter]

Thanks @martin-braun! I appreciate your help to remove the misinformation. Nice work!