Add shared command path primitives

command.go

@@ -3,10 +3,10 @@ package commandkit
 import (
 	"errors"
 	"fmt"
-	"strings"
 	"unicode"
 
 	commandmeta "gitea.maximumdirect.net/eric/CommandKit/internal/commandmeta"
+	"gitea.maximumdirect.net/eric/CommandKit/internal/commandpath"
 )
 
 // Command is an opaque, reusable declaration captured by NewCommand, Group,
@@ -297,7 +297,7 @@ func collectDeclarationIssues(command Command, parents []string, root bool, issu
 	}
 	record := command.record
 	path := append(append([]string(nil), parents...), record.name)
-	label := strings.Join(path, " ")
+	label := commandpath.FromTokens(path).String()
 	for _, issue := range record.issues {
 		if label != "" {
 			*issues = append(*issues, fmt.Errorf("command %q: %w", label, issue))
@@ -320,11 +320,7 @@ func collectDeclarationIssues(command Command, parents []string, root bool, issu
 }
 
 func validateCommandName(name string) error {
-	fields := strings.Fields(name)
-	if len(fields) != 1 || fields[0] != name || strings.HasPrefix(name, "-") || name == "--" {
-		return fmt.Errorf("command name %q must be one non-option token", name)
-	}
-	return nil
+	return commandpath.ValidateComponent(name)
 }
 
 func validateBindings[I any](flags []Flag[I], arguments []Argument[I]) error {