support for creating widget bundles

[paulfitz]

It can be useful to include custom widgets with Grist, so they can be used offline, or for simpler archiving, or for tighter integration with the rest of the app. This PR includes a script for collecting custom widget files in a structured bundle. It is parallel work to developments in grist-core, including gristlabs/grist-core#714

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[berhalak]

I think dist can be added to .gitignore.

[berhalak]

Maybe something like this, to make sure it works, (I have python 2.7 by default so it breaks for me):

  async start() {
    this.localServer = spawn('python', [
      '-u', '-m', 'http.server', this.port,
    ], {
      cwd: process.cwd(),
    });

    await new Promise((resolve, reject) => {
      this.localServer.stdout.on('data', (data) => {
        if (data.toString().includes('Serving HTTP on')) {
          resolve();
        }
      });
      this.localServer.stderr.on('data', (data) => {
        reject(data.toString());
      });
    });
  }
  

[paulfitz]

Is this to wait for the server to be up and responsive, instead of the wait() method? I think I'd still have a weak preference for waiting for a fetch() to succeed, since it seems easier to be confident of it. When checking a message on console, I find myself asking is this printed before or after the server is started. I'm a bit daunted about tracking down exact python source code, but it may be like this:
https://github.com/python/cpython/blob/20cfab903db70cf952128bc6b606e3ec4a216498/Lib/http/server.py#L1267-L1275
which at first glance looks like it prints the message first.

Separately, maybe I should write python3 instead of python?

[berhalak]

Yes, python3 will be enough :)

[berhalak]

This doesn't work for me, should it be added to the domains?

[paulfitz]

Ah, sorry, I had commented out a // domains.push('getgrist.com') line. I put it back in.

[berhalak]

Thanks.