Structured configuration support (path/dots)

[kravemir]

Does confita support structured configuration? It would be useful to make configurations more clean/organized/structure, and for configurations of growing/large projects.

I have read the README.md, but there's no example for structure config,... And, I didn't find any TOML/YAML/JSON examples of structured configurations.

I would like to populate the following structure:

type Config struct {
	// notifications configuration
	Notifications struct {
		// turns on user notifications for changes/updates/creations
		Enabled bool
		// from email address of emails
		From string
		// BCC addresses of every notification sent
		BCC []string
	}

	// SMTP server/mail-sending configuration
	SMTP struct {
		// format server:port
		ServerAddr string

		// plain auth credentials
		Username, Password string

		// default email address to sent from
		DefaultFrom string
	}
}

For example, with TOML:

notifications.enabled = true
notifications.from = "info@mysite.com"
notifications.bcc = "notifications-bcc@mysite.com"

smtp.serveraddr = "smtp.gmail.com:587"
smtp.username = "info@mysite.com"
smtp.password = "secret"
smtp.defaultfrom = "contact@mysite.com"

Or, with YAML:

notifications:
  - enabled: true
  - from: "info@mysite.com"
  - bcc:  "notifications-bcc@mysite.com"

smtp:
  - serveraddr: "smtp.gmail.com:587"
  - username: "info@mysite.com"
  - password: "secret"
  - defaultfrom: "contact@mysite.com"