fix local-model can not set as default issue

cmd/picoclaw/internal/model/command.go

@@ -9,6 +9,8 @@ import (
 	"github.com/sipeed/picoclaw/pkg/config"
 )
 
+const LocalModel = "local-model"
+
 func NewModelCommand() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "model [model_name]",
@@ -38,10 +40,6 @@ Examples:
 				return nil
 			}
 
-			if len(args) > 1 {
-				return fmt.Errorf("wrong command, should be model [model_name]")
-			}
-
 			// Set new default model
 			modelName := args[0]
 			return setDefaultModel(configPath, cfg, modelName)
@@ -96,11 +94,8 @@ func setDefaultModel(configPath string, cfg *config.Config, modelName string) er
 		}
 	}
 
-	if !modelFound {
-		fmt.Printf("Error: Model '%s' not found in config.\n\n", modelName)
-		fmt.Println("Available models:")
-		listAvailableModels(cfg)
-		panic("")
+	if !modelFound && modelName != LocalModel {
+		return fmt.Errorf("Model '%s' not found in config.", modelName)
 	}
 
 	// Update the default model

cmd/picoclaw/internal/model/command_test.go

@@ -267,23 +267,7 @@ func TestSetDefaultModel_InvalidModel(t *testing.T) {
 		},
 	}
 
-	oldStdout := os.Stdout
-	r, w, _ := os.Pipe()
-	os.Stdout = w
-
-	// This should call os.Exit(1), so we expect a panic``
-	assert.Panics(t, func() {
-		_ = setDefaultModel(configPath, cfg, "nonexistent-model")
-	})
-
-	w.Close()
-	os.Stdout = oldStdout
-
-	var buf bytes.Buffer
-	io.Copy(&buf, r)
-	output := buf.String()
-	assert.Contains(t, output, "Error: Model 'nonexistent-model' not found in config.")
-	assert.Contains(t, output, "Available models:")
+	assert.Error(t, setDefaultModel(configPath, cfg, "nonexistent-model"))
 }
 
 func TestSetDefaultModel_ModelWithoutAPIKey(t *testing.T) {
@@ -301,9 +285,7 @@ func TestSetDefaultModel_ModelWithoutAPIKey(t *testing.T) {
 		},
 	}
 
-	assert.Panics(t, func() {
-		setDefaultModel(configPath, cfg, "no-key-model")
-	})
+	assert.Error(t, setDefaultModel(configPath, cfg, "no-key-model"))
 }
 
 func TestSetDefaultModel_SaveConfigError(t *testing.T) {