cmdgrouper

type Group struct {
	Start    api.CmdID
	End      api.CmdID
	Name     string
	UserData interface{}
}

type Grouper interface {
	// Process considers the command for inclusion in the group.
	Process(context.Context, api.CmdID, api.Cmd, *api.GlobalState)
	// Build returns the groups built and resets the state of the grouper.
	Build(end api.CmdID) []Group
}

type Rule struct {
	// Pred returns true if the rule passes.
	Pred func(cmd, prev api.Cmd) bool
	// Repeats is true if the rule should repeat until it no longer passes.
	// The rule has to pass at least once for the sequence to complete.
	Repeats bool
	// Optional is true if the rule can be skipped and still have the sequence
	// complete.
	Optional bool
}

type RunPred func(cmd api.Cmd, s *api.GlobalState) (value interface{}, name string)