Added command to create empty settings

src/calanonsync/settings.go

@@ -131,7 +131,13 @@ over-the-shoulder "attacks".`,
 		Run:   runSettingsDecryption,
 	}
 
-	settingsCmd.AddCommand(encryptCmd, decryptCmd)
+	initCmd := &cobra.Command{
+		Use:   "init",
+		Short: "Initialize an empty but valid settings file.",
+		Run:   runSettingsInit,
+	}
+
+	settingsCmd.AddCommand(encryptCmd, decryptCmd, initCmd)
 	return settingsCmd
 }
 
@@ -225,6 +231,30 @@ func runSettingsDecryption(cmd *cobra.Command, args []string) {
 	log.Println("Settings decrypted")
 }
 
+func runSettingsInit(cmd *cobra.Command, args []string) {
+	if _, err := os.Stat(settingsName); err == nil || os.IsExist(err) {
+		log.Fatalln("You already have a settings file! Remove that first if you really want a new blank one!")
+	}
+
+	s := Settings{}
+	s.Anonymize.Title = &StringAnonSettings{ReplaceWith: "Replacement", Whitelist: []string{}}
+
+	// Rewrite the settings file.
+	f, err := os.OpenFile(settingsName, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600)
+	if err != nil {
+		log.Fatalf("Could not rewrite settings: %s\n", err)
+	}
+	defer f.Close()
+	e := json.NewEncoder(f)
+	e.SetIndent("", "  ")
+	err = e.Encode(&s)
+	if err != nil {
+		panic(err)
+	}
+
+	log.Println("Blank settings have been created.")
+}
+
 // Apply the anonymization rule to the given string, returning the
 // anonymized version.
 // If the anonymization is nil or empty, the original string will