add json output and expose external identifier

[nettleton]

This PR adds support for formatting the output in JSON format for easy scripting (#30). This is similar to #53 but adds a "--format" option to existing subcommands as I use the JSON output from add in some personal scripts (example).

$ reminders add MyList "some reminder" -f json | jq '.'
{
  "title": "some reminder",
  "isCompleted": false,
  "externalId": "BD2B26EF-38E1-40A7-90A4-C02ACA190145",
  "priority": 0,
  "list": "MyList"
}

2. Extends the --format option to use the external id in place of index. I use the id for urls like "x-apple-reminderkit://REMCDReminder/$id" that open the specified reminder in the Reminders app, so being able to use the id directly instead of correlating to the array index makes things simpler.

$ reminders complete MyList BD2B26EF-38E1-40A7-90A4-C02ACA190145
Completed 'some reminder'

[Kolsha]

Hi! What is the status of this MR?

[nettleton]

@Kolsha , there seem to be 2 open PRs that add overlapping functionality (see #53). @keith - do you have a preference for one, the other, or something else?

[keith]

since that other one seems stalled I'm fine with going with this one

[0xdevalias]

since that other one seems stalled I'm fine with going with this one

While I had 'eventual' plans to get back to it, I'd definitely say landing this one sooner is the better choice. Then if I ever do get back around to it, I could just update my PR for whatever the current state of the codebase is at that time.

[Kolsha]

@keith, can we merge this?

[keith]

it requires some fixes first, at least for conflicts

[nettleton]

Sorry for the late response, I have resolved conflicts with main

[0xdevalias]

@keith What are the chances of getting this one landed now?

[Kolsha]

@keith ping

[keith]

thanks! FYI I'm moving some of this around afterwards in https://github.com/keith/reminders-cli/pull/60