AddGlobalPreExec registers a function that will be executed right before a [Command] runs.

MapArgs is an easy way to map arguments to variables (targets), and require a certain amount.

MustGet is used with a [pflag.FlagSet] getter to panic if the flag is not defined, or is not the right type.

NewCommandSet is used to set up a top level [CommandSet] as the root of a CLI's command structure.

NewUsageError is used to create a [UsageError].

This is used in interactive mode to indicate that the last element on the invocation stack should be popped.

This is used in interactive mode to indicate that a set of sub-commands should be pushed to the invocation stack.

HelpPatterns is a slice of flags that should trigger the output of usage information with the top-level [CommandSet].

InteractiveFlag specifies the flag that the user should pass to trigger [CommandSet.RespondInteractive].

InteractiveQuitCommands is a slice of strings that should escape from interactive mode.

Command is an executable function in a CLI.

CommandSet is a group of [Command].

Printer is provided to easily establish policies for user messages.

UsageError is a special purpose error used to signal that usage information should be shown to the user.

CommandFunc is a function that may be executed within a [Command].

PreExec is a function that may run before execution of a [Command].