From 395d6f0ccfcaddbb9ded79ac4ca913c87453562f Mon Sep 17 00:00:00 2001
From: cheapie <no-email-for-you@example.com>
Date: Sat, 24 Nov 2018 21:00:18 -0600
Subject: [PATCH] Add digilines piston

---
 depends.txt                         |   1 +
 init.lua                            |   1 +
 piston.lua                          | 190 ++++++++++++++++++++++++++++
 sounds/digistuff_piston_extend.ogg  | Bin 0 -> 6301 bytes
 sounds/digistuff_piston_retract.ogg | Bin 0 -> 6214 bytes
 textures/digistuff_piston_sides.png | Bin 0 -> 5179 bytes
 6 files changed, 192 insertions(+)
 create mode 100644 piston.lua
 create mode 100644 sounds/digistuff_piston_extend.ogg
 create mode 100644 sounds/digistuff_piston_retract.ogg
 create mode 100644 textures/digistuff_piston_sides.png

diff --git a/depends.txt b/depends.txt
index a581a9b..cfb8465 100644
--- a/depends.txt
+++ b/depends.txt
@@ -1,3 +1,4 @@
 default?
 digilines
 mesecons?
+mesecons_mvps?
diff --git a/init.lua b/init.lua
index 4fa7a2b..13786a6 100644
--- a/init.lua
+++ b/init.lua
@@ -11,6 +11,7 @@ local components = {
 	"piezo",
 	"detector",
 	"conductors",
+	"piston",
 }
 for _,name in ipairs(components) do
 	dofile(string.format("%s%s%s.lua",minetest.get_modpath(minetest.get_current_modname()),DIR_DELIM,name))
diff --git a/piston.lua b/piston.lua
new file mode 100644
index 0000000..cb3fc6b
--- /dev/null
+++ b/piston.lua
@@ -0,0 +1,190 @@
+if not minetest.get_modpath("mesecons_mvps") then
+	minetest.log("error","mesecons_mvps is not installed - digilines piston will not be available!")
+	return
+end
+
+local function extend(pos,node,max)
+	local meta = minetest.get_meta(pos):to_table()
+	local facedir = minetest.facedir_to_dir(node.param2)
+	local actiondir = vector.multiply(facedir,-1)
+	local ppos = vector.add(pos,actiondir)
+	local success,stack,oldstack = mesecon.mvps_push(ppos,actiondir,max)
+	if not success then return end
+	minetest.sound_play("digistuff_piston_extend",{pos = pos,max_hear_distance = 20,gain = 0.6})
+	minetest.swap_node(pos,{name = "digistuff:piston_ext",param2 = node.param2})
+	minetest.swap_node(ppos,{name = "digistuff:piston_pusher",param2 = node.param2})
+	mesecon.mvps_process_stack(stack)
+	mesecon.mvps_move_objects(ppos,actiondir,oldstack)
+	minetest.get_meta(pos):from_table(meta)
+end
+
+local function retract(pos,node,max,allsticky)
+	local facedir = minetest.facedir_to_dir(node.param2)
+	local actiondir = vector.multiply(facedir,-1)
+	local ppos = vector.add(pos,actiondir)
+	minetest.swap_node(pos,{name = "digistuff:piston",param2 = node.param2})
+	if minetest.get_node(ppos).name == "digistuff:piston_pusher" then
+		minetest.remove_node(ppos)
+	end
+	minetest.sound_play("digistuff_piston_retract",{pos = pos,max_hear_distance = 20,gain = 0.6})
+	minetest.check_for_falling(ppos)
+	if type(max) ~= "number" or max <= 0 then return end
+	local pullpos = vector.add(pos,vector.multiply(actiondir,2))
+	local success,stack,oldstack
+	if allsticky then
+		success,stack,oldstack = mesecon.mvps_pull_all(pullpos,facedir,max)
+	else
+		success,stack,oldstack = mesecon.mvps_pull_single(pullpos,facedir,max)
+	end
+	if success then
+		mesecon.mvps_move_objects(pullpos,actiondir,oldstack,-1)
+	end
+end
+
+minetest.register_node("digistuff:piston", {
+	description = "Digilines Piston",
+	groups = {cracky=3},
+	paramtype2 = "facedir",
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("formspec","field[channel;Channel;${channel}")
+	end,
+	tiles = {
+		"digistuff_piston_sides.png^[transformR180",
+		"digistuff_piston_sides.png",
+		"digistuff_piston_sides.png^[transformR90",
+		"digistuff_piston_sides.png^[transformR270",
+		"digistuff_camera_pole.png",
+		"digistuff_camera_pole.png",
+	},
+	on_receive_fields = function(pos, formname, fields, sender)
+		local name = sender:get_player_name()
+		if minetest.is_protected(pos,name) and not minetest.check_player_privs(name,{protection_bypass=true}) then
+			minetest.record_protection_violation(pos,name)
+			return
+		end
+		local meta = minetest.get_meta(pos)
+		if fields.channel then meta:set_string("channel",fields.channel) end
+	end,
+	digiline = 
+	{
+		receptor = {},
+		effector = {
+			action = function(pos,node,channel,msg)
+					local meta = minetest.get_meta(pos)
+					local setchan = meta:get_string("channel")
+					if channel ~= setchan then return end
+					if msg == "extend" then
+						extend(pos,node,16)
+					elseif type(msg) == "table" and msg.action == "extend" then
+						local max = 16
+						if type(msg.max) == "number" then
+							max = math.max(0,math.min(16,math.floor(msg.max)))
+						end
+						extend(pos,node,max)
+					end
+				end
+		},
+	},
+})
+
+minetest.register_node("digistuff:piston_ext", {
+	description = "Digilines Piston (extended state - you hacker you!)",
+	groups = {cracky = 3,not_in_creative_inventory = 1},
+	paramtype2 = "facedir",
+	tiles = {
+		"digistuff_piston_sides.png^[transformR180",
+		"digistuff_piston_sides.png",
+		"digistuff_piston_sides.png^[transformR90",
+		"digistuff_piston_sides.png^[transformR270",
+		"digistuff_camera_pole.png",
+		"digistuff_camera_pole.png",
+	},
+	drop = "digistuff:piston",
+	drawtype = "nodebox",
+	node_box = {
+		type = "fixed",
+		fixed = {
+				{-0.5,-0.5,-0.3,0.5,0.5,0.5},
+				{-0.2,-0.2,-0.5,0.2,0.2,-0.3},
+			}
+	},
+	selection_box = {
+		type = "fixed",
+		fixed = {
+				{-0.5,-0.5,-1.5,0.5,0.5,0.5},
+			}
+	},
+	on_rotate = function() return false end,
+	on_receive_fields = function(pos, formname, fields, sender)
+		local name = sender:get_player_name()
+		if minetest.is_protected(pos,name) and not minetest.check_player_privs(name,{protection_bypass=true}) then
+			minetest.record_protection_violation(pos,name)
+			return
+		end
+		local meta = minetest.get_meta(pos)
+		if fields.channel then meta:set_string("channel",fields.channel) end
+	end,
+	after_dig_node = function(pos,node)
+		local pdir = vector.multiply(minetest.facedir_to_dir(node.param2),-1)
+		local ppos = vector.add(pos,pdir)
+		if minetest.get_node(ppos).name == "digistuff:piston_pusher" then
+			minetest.remove_node(ppos)
+		end
+	end,
+	digiline = 
+	{
+		receptor = {},
+		effector = {
+			action = function(pos,node,channel,msg)
+					local meta = minetest.get_meta(pos)
+					local setchan = meta:get_string("channel")
+					if channel ~= setchan then return end
+					if msg == "retract" then
+						retract(pos,node)
+					elseif msg == "retract_sticky" then
+						retract(pos,node,16)
+					elseif type(msg) == "table" and msg.action == "retract" then
+						local max = 16
+						if type(msg.max) == "number" then
+							max = math.max(0,math.min(16,math.floor(msg.max)))
+						elseif msg.max == nil then
+							max = 0
+						end
+						retract(pos,node,max,msg.allsticky)
+					end
+				end
+		},
+	},
+})
+
+minetest.register_node("digistuff:piston_pusher", {
+	description = "Digilines Piston Pusher (you hacker you!)",
+	groups = {not_in_creative_inventory=1},
+	paramtype2 = "facedir",
+	tiles = {
+		"digistuff_piston_sides.png^[transformR180",
+		"digistuff_piston_sides.png",
+		"digistuff_piston_sides.png^[transformR90",
+		"digistuff_piston_sides.png^[transformR270",
+		"digistuff_camera_pole.png",
+		"digistuff_camera_pole.png",
+	},
+	drawtype = "nodebox",
+	node_box = {
+		type = "fixed",
+		fixed = {
+				{-0.5,-0.5,-0.5,0.5,0.5,-0.3},
+				{-0.2,-0.2,-0.3,0.2,0.2,0.5},
+			}
+	},
+	selection_box = {
+		type = "fixed",
+		fixed = {
+				{0,0,0,0,0,0},
+			}
+	},
+})
+
+mesecon.register_mvps_stopper("digistuff:piston_ext")
+mesecon.register_mvps_stopper("digistuff:piston_pusher")
diff --git a/sounds/digistuff_piston_extend.ogg b/sounds/digistuff_piston_extend.ogg
new file mode 100644
index 0000000000000000000000000000000000000000..2a855dfeccac5d917d642f0c30e2f31cca1a2174
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