[#1332] cli/playground: Move command handler selection to separate function

Change-Id: I2dcbd85e61960c3cf141b815edab174e308ef858
Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>

cmd/frostfs-cli/modules/container/policy_playground.go

@@ -260,6 +260,28 @@ Example of usage:
 	},
 }
 
+func (repl *policyPlaygroundREPL) handleCommand(args []string) error {
+	if len(args) == 0 {
+		return nil
+	}
+
+	switch args[0] {
+	case "list", "ls":
+		return repl.handleLs(args[1:])
+	case "add":
+		return repl.handleAdd(args[1:])
+	case "load":
+		return repl.handleLoad(args[1:])
+	case "remove", "rm":
+		return repl.handleRemove(args[1:])
+	case "eval":
+		return repl.handleEval(args[1:])
+	case "help":
+		return repl.handleHelp(args[1:])
+	}
+	return fmt.Errorf("unknown command %q", args[0])
+}
+
 func (repl *policyPlaygroundREPL) run() error {
 	if len(viper.GetString(commonflags.RPC)) > 0 {
 		key := key.GetOrGenerate(repl.cmd)
@@ -277,17 +299,6 @@ func (repl *policyPlaygroundREPL) run() error {
 		}
 	}
 
-	cmdHandlers := map[string]func([]string) error{
-		"list":   repl.handleLs,
-		"ls":     repl.handleLs,
-		"add":    repl.handleAdd,
-		"load":   repl.handleLoad,
-		"remove": repl.handleRemove,
-		"rm":     repl.handleRemove,
-		"eval":   repl.handleEval,
-		"help":   repl.handleHelp,
-	}
-
 	var cfgCompleter []readline.PrefixCompleterInterface
 	var helpSubItems []readline.PrefixCompleterInterface
 
@@ -326,17 +337,8 @@ func (repl *policyPlaygroundREPL) run() error {
 		}
 		exit = false
 
-		parts := strings.Fields(line)
-		if len(parts) == 0 {
-			continue
-		}
-		cmd := parts[0]
-		if handler, exists := cmdHandlers[cmd]; exists {
-			if err := handler(parts[1:]); err != nil {
-				fmt.Fprintf(repl.console, "error: %v\n", err)
-			}
-		} else {
-			fmt.Fprintf(repl.console, "error: unknown command %q\n", cmd)
+		if err := repl.handleCommand(strings.Fields(line)); err != nil {
+			fmt.Fprintf(repl.console, "error: %v\n", err)
 		}
 	}
 }