As knative admin, I want to list custom domains

[ZhuangYuZY]

Now we have kn admin domain set to set custom-domain. But we are missing a list command to show custom domains.

List Knative custom domain

Usage:
  kn admin domain list [flags]

Examples:

  # To list all custom domains
  kn admin domain list

Flags:
  -h, --help         help for list
      --no-headers   When using the default output format, don't print headers (default: print headers).

Global Flags:
      --config string   config file (default is $HOME/.config/kn/plugins/admin.yaml)

[ZhuangYuZY]

@zhanggbj Based on our talk, there is pkg for format output. Could you please give a reference to implement domain list ? Thank you

[ZhuangYuZY]

/assign
I also work on this new command.

[zhanggbj]

@ZhuangYuZY
As kn-admin is a plugin of kn client, I think it's good to align with kn client, althrough there're some common go pkg for printer.

• Here is the pkg from kn client "knative.dev/client/pkg/printers"
• We can refer to route list here

One concern from my side, if we're going to list all, I think there's no need to specify flags --custom-domain any more.

[ZhuangYuZY]

I remove the --custom-domain flag. Thank you.

[ZhuangYuZY]

knative-extensions/kn-plugin-admin#3 created