mu: add 'tickle' command, for renaming messages

The new command 'tickle' renames message files in place, which can be
useful for 3rd-party tools.

mu/mu-cmd.c

@@ -412,6 +412,33 @@ mu_cmd_remove (MuStore *store, MuConfig *opts, GError **err)
 	return foreach_msg_file (store, opts, remove_path_func, err);
 }
 
+static gboolean
+tickle_func (MuStore *store, const char *path, GError **err)
+{
+	MuMsg		*msg;
+	gboolean	 rv;
+
+	msg = mu_msg_new_from_file (path, NULL, err);
+	if (!msg)
+		return FALSE;
+
+	rv = mu_msg_tickle (msg, err);
+	mu_msg_unref (msg);
+
+	return rv;
+}
+
+
+MuError
+mu_cmd_tickle (MuStore *store, MuConfig *opts, GError **err)
+{
+	g_return_val_if_fail (opts, MU_ERROR_INTERNAL);
+	g_return_val_if_fail (opts->cmd == MU_CONFIG_CMD_TICKLE,
+			      MU_ERROR_INTERNAL);
+
+	return foreach_msg_file (store, opts, tickle_func, err);
+}
+
 struct _VData {
 	MuMsgPartSigStatus combined_status;
 	char *report;
@@ -632,6 +659,8 @@ mu_cmd_execute (MuConfig *opts, GError **err)
 		merr = with_store (mu_cmd_add, opts, FALSE, err);      break;
 	case MU_CONFIG_CMD_REMOVE:
 		merr = with_store (mu_cmd_remove, opts, FALSE, err);   break;
+	case MU_CONFIG_CMD_TICKLE:
+		merr = with_store (mu_cmd_tickle, opts, FALSE, err);   break;
 	case MU_CONFIG_CMD_SERVER:
 		merr = with_store (mu_cmd_server, opts, FALSE, err);   break;
 	default:

mu/mu-cmd.h

@@ -151,6 +151,18 @@ MuError mu_cmd_add (MuStore *store, MuConfig *opts, GError **err);
  */
 MuError mu_cmd_remove (MuStore *store, MuConfig *opts, GError **err);
 
+/**
+ * execute the tickle command
+ *
+ * @param store store object to use
+ * @param opts configuration options
+ * @param err receives error information, or NULL
+ *
+ * @return MU_OK (0) if the command succeeds,
+ * some error code otherwise
+ */
+MuError mu_cmd_tickle (MuStore *store, MuConfig *opts, GError **err);
+
 
 /**
  * execute the server command

mu/mu-config.c

@@ -471,6 +471,7 @@ cmd_from_string (const char *str)
 		{ "remove",  MU_CONFIG_CMD_REMOVE  },
 		{ "script",  MU_CONFIG_CMD_SCRIPT  },
 		{ "server",  MU_CONFIG_CMD_SERVER  },
+		{ "tickle",  MU_CONFIG_CMD_TICKLE  },
 		{ "verify",  MU_CONFIG_CMD_VERIFY  },
 		{ "view",    MU_CONFIG_CMD_VIEW    }
 	};

mu/mu-config.h

@@ -74,6 +74,7 @@ enum _MuConfigCmd {
 	MU_CONFIG_CMD_REMOVE,
 	MU_CONFIG_CMD_SCRIPT,
 	MU_CONFIG_CMD_SERVER,
+	MU_CONFIG_CMD_TICKLE,
 	MU_CONFIG_CMD_VERIFY,
 	MU_CONFIG_CMD_VIEW,