Delegate plugin --help flag to the plugin

[vcheung-stripe]

Reviewers

r? @
cc @stripe/developer-products

Summary

There is a bug where if you run a plugin command with --help or -h, you get the wrong output. This is because cobra parses the --help flag in the mainline CLI, bypassing the plugin process completely.

Expected:

❯ stripe apps --help
Commands for building Stripe apps

Usage:
  stripe apps [command]

Available Commands:
  add         Add a building block for developing your app
  create      Create a new Stripe app
  grant       Grant configuration access to your app
  help        Help about any command
  remove      Remove a building block from your stripe-app json
  revoke      Revoke configuration access to your app
  start       Start a development server for viewing your app in the Stripe dashboard
  upload      Upload your app to be submitted for review

Flags:
      --api-key string        Your API key to use for the command
      --color string          turn on/off color output (on, off, auto)
      --config string         config file (default is $HOME/.config/stripe/config.toml)
      --device-name string    device name
  -h, --help                  help for apps
      --log-level string      log level (debug, info, trace, warn, error) (default "info")
  -p, --project-name string   the project name to read from for config (default "default")

Use "stripe apps [command] --help" for more information about a command.

Actual:

❯ stripe apps --help
Usage:
  stripe apps [flags]

Flags:
  -h, --help   help for apps

Global flags:
      --api-key string        Your API key to use for the command
      --color string          turn on/off color output (on, off, auto)
      --config string         config file (default is $HOME/.config/stripe/config.toml)
      --device-name string    device name
      --log-level string      log level (debug, info, trace, warn, error) (default "info")
  -p, --project-name string   the project name to read from for config (default "default")

We fix this bug by overriding the default help function in the mainline CLI's plugin command: we call into the plugin process, passing along the --help flag so that the plugin process's help function gets invoked.

[etsai-stripe]

good catch!