Add Cobra-backed command parsing

parser.go

@@ -0,0 +1,41 @@
+package commandkit
+
+import (
+	"sort"
+
+	internalcobra "gitea.maximumdirect.net/eric/CommandKit/internal/cobra"
+)
+
+func (a *App) parse(args []string, options internalcobra.ParseOptions) internalcobra.Result {
+	if a == nil {
+		return internalcobra.Result{Failure: &internalcobra.Failure{Message: "cannot parse commands on a nil app"}}
+	}
+	root := &internalcobra.Command{Name: a.identity.Name}
+	names := make([]string, 0, len(a.commands))
+	for name, node := range a.commands {
+		if !node.reserved {
+			names = append(names, name)
+		}
+	}
+	sort.Strings(names)
+	for _, name := range names {
+		root.Children = append(root.Children, bridgeCommand(a.commands[name].command))
+	}
+	return internalcobra.Parse(root, args, options)
+}
+
+func bridgeCommand(command Command) *internalcobra.Command {
+	declaration := &internalcobra.Command{
+		Name:        command.name,
+		Summary:     command.summary,
+		Description: command.description,
+	}
+	if command.payload != nil {
+		declaration.Runnable = command.payload.hasRun()
+		declaration.Flags = command.payload.bridgeFlags()
+	}
+	for _, child := range command.children {
+		declaration.Children = append(declaration.Children, bridgeCommand(child))
+	}
+	return declaration
+}