[Idea] [Breaking changes!] Add shorthand flags

[xmudrii]

I'm starting this as idea to make shorthand flags work.
Current status when you execute doctl compute droplet delete:

Delete droplet by id or name

Usage:
  doctl compute droplet delete ID [ID|Name ...] [flags]

Aliases:
  delete, d, del, rm


Flags:
      --force   Force droplet delete
  -h, --help    help for delete

Global Flags:
  -t, --access-token string   API V2 Access Token
  -c, --config string         config file (default is $HOME/.config/doctl/config.yaml)
  -o, --output string         output format [text|json] (default "text")
      --trace                 trace api access
  -v, --verbose               verbose output

Error: (droplet.delete) command is missing required arguments

If you want to force delete, you'll have to type --force. I don't see that natural in Unix world, as it's mostly normal to have shorthand flag (-f).

When I was implementing delete confirm in #148, there was no way to do it, and at that point I had no time to play around it.

That's not only for force, it's for all flags.

This is ready code, it's fully usable (I'm not sure about tests tho), and it's working.
I added one more argument for shorthand Add*Flag and changed from * to *P (e.g. String to StringP).

I feel like it could be done better, but let's discuss and give me idea if you agree with adding shorthand flags.

When you execute same command after chagnes:

Delete droplet by id or name

Usage:
  doctl compute droplet delete ID [ID|Name ...] [flags]

Aliases:
  delete, d, del, rm


Flags:
  -f, --force   Force droplet delete
  -h, --help    help for delete

Global Flags:
  -t, --access-token string   API V2 Access Token
  -c, --config string         config file (default is $HOME/.config/doctl/config.yaml)
  -o, --output string         output format [text|json] (default "text")
      --trace                 trace api access
  -v, --verbose               verbose output

Error: (droplet.delete) command is missing required arguments

Both -f and --force are working!

I hope you like idea.

cc @aybabtme @phillbaker @andrewsomething @nanzhong @mchitten

[nanzhong]

Nice, I like it! @aybabtme what do you think?

[nanzhong]

Tiny nitpick, extra whitespace.

[xmudrii]

@nanzhong fixed. :D I hope it's correct now. Also fixed indentation for volumes.go at one point.
And yea, commit should be formatting but whatever. :P

[aybabtme]

lgtm!

[aybabtme]

I'm curious why this large block of commented out code?

[nanzhong]

My assumption was some placeholder in case we want to introduce more short flags for other things?

[xmudrii]

@nanzhong @aybabtme I left it for placeholder, but I removed it. For now I defined it for force action, but we can add more actions later.

[nanzhong]

Thanks @xmudrii for all your contributions. We realize that we've been a little slow to respond, but hoping to change that in the coming year. :) 🎆

[xmudrii]

No problem, glad to help. :) And that's not a problem. :)