Prevent adding duplicate services

cmd/add.go

@@ -22,6 +22,7 @@ THE SOFTWARE.
 package cmd
 
 import (
+	"errors"
 	"fmt"
 
 	"github.com/manifoldco/promptui"
@@ -48,14 +49,20 @@ var addCmd = &cobra.Command{
 
 		// Set service name
 		prompt := promptui.Prompt{
-			Label:    "Service name",
-			Validate: config.ValidateKey,
-			Default:  backend,
+			Label:   "Service name",
+			Default: backend,
+			Validate: func(s string) error {
+				srv, _ := config.GetService(s)
+				if srv != nil {
+					return errors.New("a service with this name already exists")
+				}
+				return config.ValidateKey(s)
+			},
 		}
 		name, err := prompt.Run()
 		cobra.CheckErr(err)
 
-		// Prepate service config
+		// Prepare service config
 		service := config.ServiceConfig{
 			Name:    name,
 			Backend: backend,

internal/config/services.go

@@ -15,7 +15,11 @@ Scotty. If not, see <https://www.gnu.org/licenses/>.
 
 package config
 
-import "github.com/spf13/viper"
+import (
+	"fmt"
+
+	"github.com/spf13/viper"
+)
 
 type ServiceConfig struct {
 	Name         string
@@ -23,6 +27,22 @@ type ServiceConfig struct {
 	ConfigValues map[string]any
 }
 
+func NewServiceConfig(name string, config *viper.Viper) ServiceConfig {
+	service := ServiceConfig{
+		Name:         name,
+		Backend:      viper.GetString("backend"),
+		ConfigValues: make(map[string]any),
+	}
+
+	for key, val := range viper.AllSettings() {
+		if key != "backend" {
+			service.ConfigValues[key] = val
+		}
+	}
+
+	return service
+}
+
 func (c *ServiceConfig) Save() error {
 	key := "service." + c.Name
 	viper.Set(key+".backend", c.Backend)
@@ -31,3 +51,28 @@ func (c *ServiceConfig) Save() error {
 	}
 	return viper.WriteConfig()
 }
+
+func AllServices() map[string]ServiceConfig {
+	services := make(map[string]ServiceConfig)
+	config := viper.Sub("service")
+	if config != nil {
+		for k, v := range config.AllSettings() {
+			s, ok := v.(*viper.Viper)
+			if ok {
+				services[k] = NewServiceConfig(k, s)
+			}
+		}
+	}
+	return services
+}
+
+func GetService(name string) (*ServiceConfig, error) {
+	key := "service." + name
+	config := viper.Sub(key)
+	if config != nil {
+		service := NewServiceConfig(name, config)
+		return &service, nil
+	}
+
+	return nil, fmt.Errorf("no service configuration \"%v\"", name)
+}