Add --wipe flag to rm the output dir pre-generate

- As discussed in #96

boilingcore/boilingcore.go

@@ -333,6 +333,12 @@ func (s *State) initTags(tags []string) error {
 
 // initOutFolder creates the folder that will hold the generated output.
 func (s *State) initOutFolder() error {
+	if s.Config.Wipe {
+		if err := os.RemoveAll(s.Config.OutFolder); err != nil {
+			return err
+		}
+	}
+
 	return os.MkdirAll(s.Config.OutFolder, os.ModePerm)
 }
 

boilingcore/config.go

@@ -15,6 +15,7 @@ type Config struct {
 	NoTests          bool
 	NoHooks          bool
 	NoAutoTimestamps bool
+	Wipe             bool
 
 	Postgres PostgresConfig
 	MySQL    MySQLConfig

main.go

@@ -86,6 +86,7 @@ func main() {
 	rootCmd.PersistentFlags().BoolP("no-auto-timestamps", "", false, "Disable automatic timestamps for created_at/updated_at")
 	rootCmd.PersistentFlags().BoolP("version", "", false, "Print the version")
 	rootCmd.PersistentFlags().BoolP("tinyint-as-bool", "", false, "Map MySQL tinyint(1) in Go to bool instead of int8")
+	rootCmd.PersistentFlags().BoolP("wipe", "", false, "Delete the output folder (rm -rf) before generation to ensure sanity")
 
 	viper.SetDefault("postgres.sslmode", "require")
 	viper.SetDefault("postgres.port", "5432")
@@ -134,6 +135,7 @@ func preRun(cmd *cobra.Command, args []string) error {
 		NoTests:          viper.GetBool("no-tests"),
 		NoHooks:          viper.GetBool("no-hooks"),
 		NoAutoTimestamps: viper.GetBool("no-auto-timestamps"),
+		Wipe:             viper.GetBool("wipe"),
 	}
 
 	// BUG: https://github.com/spf13/viper/issues/200