config init now leaves out the test sources unless given --all

A section tagged init:"hidden" isn't written to the file config init
generates; fts_mock and sleeper are. config init --all writes them too.
They still load, and the config commands read and set them as before.

internal/cli/config/init.go

@@ -17,7 +17,11 @@ func commandInit() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "init [config_path]",
 		Args:  cobra.MatchAll(cobra.MinimumNArgs(0), cobra.MaximumNArgs(1)),
-		Short: "Create an empty configuration file",
+		Short: "Create a configuration file holding the defaults",
+		Long: `Create a configuration file holding the defaults, at config_path or,
+without one, the first config.yaml found in /etc/job-search then the working
+directory (/etc/job-search/config.yaml if there is none). The test sources
+(fts_mock and sleeper) are left out unless --all is given.`,
 		PersistentPreRun: func(cmd *cobra.Command, args []string) {
 			slog.Debug("command persistent pre-run", "command", "config.init")
 		},
@@ -64,26 +68,29 @@ func commandInit() *cobra.Command {
 				return err
 			}
 
-			// Load default configuration
-			config.LoadDefaultConfig()
-
-			if viper.ConfigFileUsed() == "" {
-				viper.SetConfigFile(config.EtcConfigPath + "/config.yaml")
+			path := viper.ConfigFileUsed()
+			if path == "" {
+				path = config.EtcConfigPath + "/config.yaml"
 			}
 
-			fmt.Print(
-				"writing default configuration to file: " +
-					viper.ConfigFileUsed() +
-					"\n",
-			)
-
-			if err := viper.WriteConfig(); err != nil {
-				return err
+			// A Viper of its own, holding only the keys to write: the global
+			// one would write every default, the hidden sections' included.
+			all, _ := cmd.Flags().GetBool("all")
+			generated := viper.New()
+			for key, value := range config.InitDefaults(all) {
+				generated.Set(key, value)
 			}
+			generated.SetConfigFile(path)
 
-			return nil
+			fmt.Print("writing default configuration to file: " + path + "\n")
+
+			return generated.WriteConfig()
 		},
 	}
+	cmd.Flags().Bool(
+		"all", false, "also write the test sources (fts_mock and sleeper)",
+	)
+
 	// Config flag should be hidden as the config path should be provided
 	cmd.SetHelpFunc(func(command *cobra.Command, args []string) {
 		command.Flags().MarkHidden("config") //nolint:errcheck,gosec // a root flag, so it always exists