From 151c6935017d34691d37dcb4b6114f7a09c9aa1a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gabriel=20P=C3=A9rez-Cerezo?= <gabriel@gpcf.eu>
Date: Tue, 16 Feb 2021 17:53:29 +0100
Subject: Make the gondola wagons change their texture according to their
 content

---
 moretrains_gondola/init.lua                        |  60 ++++++++++++++++++++-
 .../textures/moretrains_wagon_gondola_cobble.png   | Bin 52107 -> 51732 bytes
 2 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/moretrains_gondola/init.lua b/moretrains_gondola/init.lua
index 91c9522..b5db28e 100644
--- a/moretrains_gondola/init.lua
+++ b/moretrains_gondola/init.lua
@@ -6,9 +6,58 @@ else
 end
 
 
+local function escape_texture(str)
+	return str:gsub("\\[", "\\["):gsub(":", "\\:"):gsub("[\\^]", "\\^")
+end
+
+local function	set_textures(self, data)
+	local inv = minetest.get_inventory({type="detached", name="advtrains_wgn_"..data.id})
+	if inv then
+		if inv:is_empty("box") then
+			self.object:set_properties({
+						mesh="moretrains_gondola.b3d",
+			})
+			return
+		end			
+		local stack = inv:get_stack("box",1)
+		local name = stack:get_name()		
+		local ndef = minetest.registered_nodes[name]
+		if ndef then
+			local dtype = ndef.drawtype
+			if dtype == "normal" or dtype == "allfaces" or dtype == "allfaces_optional" or dtype == "glasslike" or dtype == "glasslike_framed" or dtype == "glasslike_framed_optional" or dtype == "liquid" then
+				local texture = ndef.tiles or "default_cobble.png"
+				if type(texture) == "table" then
+					texture = texture[1] or "default_cobble.png"
+				end
+				self.object:set_properties({
+						mesh="moretrains_gondola_mese.b3d",
+						textures={"[combine:256x256:0,0=moretrains_wagon_gondola_cobble.png:0,109="..escape_texture(texture).."\\^\\[resize\\:16x16"}
+				})
+			end
+		else
+			local idef = minetest.registered_items[name]
+			if idef and idef.groups.advtrains_trackplacer and idef.groups.advtrains_trackplacer > 0 then
+				self.object:set_properties({
+						mesh="moretrains_gondola_rails.b3d",
+						textures = {"moretrains_wagon_gondola.png"},
+				})
+			else
+				self.object:set_properties({
+						mesh="moretrains_gondola_toiletpaper.b3d",
+						textures = {"moretrains_wagon_gondola.png"},
+				})
+			end
+		end		
+	end
+end
+
+local function convert(self, dtime, data, train)
+	data.type = "advtrains:moretrains_wagon_gondola"
+end
 advtrains.register_wagon("moretrains_wagon_gondola", {
 	mesh="moretrains_gondola.b3d",
 	textures = {"moretrains_wagon_gondola.png"},
+	set_textures = set_textures,
 	seats = {},
 	drives_on={default=true},
 	max_speed=20,
@@ -34,6 +83,7 @@ advtrains.register_wagon("moretrains_wagon_gondola_mese", {
 	textures = {"moretrains_wagon_gondola.png"},
 	seats = {},
 	drives_on={default=true},
+	custom_on_step = convert,
 	max_speed=20,
 	visual_size = {x=1, y=1},
 	wagon_span=2.784,
@@ -51,10 +101,13 @@ advtrains.register_wagon("moretrains_wagon_gondola_mese", {
 	},
 }, S("Gondola wagon with mese"), "moretrains_wagon_gondola_mese_inv.png")
 
+
+
 advtrains.register_wagon("moretrains_wagon_gondola_cobble", {
 	mesh="moretrains_gondola_mese.b3d",
-	textures = {"moretrains_wagon_gondola_cobble.png"},
+	textures = {"[combine:256x256:0,0=moretrains_wagon_gondola_cobble.png:0,109=default_obsidian_glass.png\\^\\[resize\\:16x16"},
 	seats = {},
+	custom_on_step = convert,
 	drives_on={default=true},
 	max_speed=20,
 	visual_size = {x=1, y=1},
@@ -76,6 +129,8 @@ advtrains.register_wagon("moretrains_wagon_gondola_cobble", {
 advtrains.register_wagon("moretrains_wagon_gondola_toiletpaper", {
 	mesh="moretrains_gondola_toiletpaper.b3d",
 	textures = {"moretrains_wagon_gondola.png"},
+	set_textures = set_textures,
+	custom_on_step = convert,
 	seats = {},
 	drives_on={default=true},
 	max_speed=20,
@@ -98,6 +153,7 @@ advtrains.register_wagon("moretrains_wagon_gondola_toiletpaper", {
 advtrains.register_wagon("moretrains_wagon_gondola_rails", {
 	mesh="moretrains_gondola_rails.b3d",
 	textures = {"moretrains_wagon_gondola.png"},
+	custom_on_step = convert,
 	seats = {},
 	drives_on={default=true},
 	max_speed=20,
@@ -151,4 +207,4 @@ minetest.register_craft({
 	output = "advtrains:moretrains_wagon_gondola_rails",
 	type = "shapeless",
 	recipe = {"advtrains:moretrains_wagon_gondola", "advtrains:dtrack_placer", "advtrains:dtrack_placer"},
-})
\ No newline at end of file
+})
diff --git a/moretrains_gondola/textures/moretrains_wagon_gondola_cobble.png b/moretrains_gondola/textures/moretrains_wagon_gondola_cobble.png
index 766a27e..882c4b7 100644
Binary files a/moretrains_gondola/textures/moretrains_wagon_gondola_cobble.png and b/moretrains_gondola/textures/moretrains_wagon_gondola_cobble.png differ
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