From f66013f0b1dc805ead3b1a6338c981f5352432e9 Mon Sep 17 00:00:00 2001
From: fly <merspieler@airmail.cc>
Date: Tue, 11 Feb 2020 16:39:41 +0000
Subject: [PATCH] save.nas

Signed-off-by: fly <merspieler@airmail.cc>
---
 Nasal/Systems/save.nas | 57 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Nasal/Systems/save.nas

diff --git a/Nasal/Systems/save.nas b/Nasal/Systems/save.nas
new file mode 100644
index 00000000..927ab4cc
--- /dev/null
+++ b/Nasal/Systems/save.nas
@@ -0,0 +1,57 @@
+# Copyright (C) 2020 Merspieler, merspieler _at_ airmail.cc
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+# Save and restore properties between sessions
+
+# To add more properties, just add them here:
+var saved_props = [
+	"/consumables/fuel/tank[0]/level-lbs",
+	"/consumables/fuel/tank[1]/level-lbs",
+	"/consumables/fuel/tank[2]/level-lbs",
+	"/consumables/fuel/tank[3]/level-lbs",
+	"/consumables/fuel/tank[4]/level-lbs"
+];
+var file = getprop("/sim/fg-home") ~ "/Export/" ~ getprop("/sim/aircraft") ~ "-save.xml";
+
+var save = func {
+	print("Saving state...");
+	for (var i = 0; i < size(saved_props); i += 1)
+	{
+		setprop("/save" ~ saved_props[i], getprop(saved_props[i]));
+	}
+
+	var saveNode = props.globals.getNode("/save", 0);
+
+	io.write_properties(file, saveNode);
+	print("State saved");
+}
+
+var restore = func {
+	print("Loading saved state...");
+	var readNode = props.globals.initNode("/save", );
+
+	io.read_properties(file, readNode);
+
+	for (var i = 0; i < size(saved_props); i += 1)
+	{
+		var val = getprop("/save" ~ saved_props[i]);
+		if (val != nil)
+		{
+			setprop(saved_props[i], val);
+		}
+	}
+	print("Saved state loaded");
+}