Main entry point.

NewApp return *cli.App with module and command modules.

NewCommand return cli.Command with module.

NewModule create Module instance.

WrapAction wrap action with default error handler.

WrapMainAction wrap main action with default error handler and command helper.

VersionModule provide module of version, Set nil to disable version command.

Module for cli, used for cli.App or cli.Command.

Actions slice of cli.ActionFunc.

Modules slice of Module.