type Command struct {
	// Name is the unique identifier for the command.
	Name string

	// Short is a concise description shown in the 'librarian -h' output.
	Short string

	// maybeGetLanguageRepo attempts to obtain a language-specific Git
	// repository, cloning if necessary.  Returns nil if not applicable.
	maybeGetLanguageRepo func(workRoot string) (*gitrepo.Repo, error)

	// maybeLoadStateAndConfig attempts to load pipeline state and config, even if no
	// language repo is present.
	maybeLoadStateAndConfig func(languageRepo *gitrepo.Repo) (*statepb.PipelineState, *statepb.PipelineConfig, error)

	// execute runs the command's with the provided context.
	execute func(*commandState) error

	// flagFunctions are functions to initialize the command's flag set.
	flagFunctions []func(fs *flag.FlagSet)

	// flags is the command's flag set for parsing arguments and generating
	// usage messages. This is populated for each command in init().
	flags *flag.FlagSet
}

type Command struct {
	// Name is the unique identifier for the command.
	Name string

	// Short is a concise description shown in the 'librarian -h' output.
	Short string

	// Run executes the command.
	Run func(ctx context.Context) error

	// flagFunctions are functions to initialize the command's flag set.
	flagFunctions []func(fs *flag.FlagSet)

	// flags is the command's flag set for parsing arguments and generating
	// usage messages. This is populated for each command in init().
	flags *flag.FlagSet
}