Split wires into their own mod, introduce autoconnect hooks

The update_autoconnect function had to be abstracted away from the
default wires, any kind of wire can now register autoconnect hooks,
which should make having multiple different wire types much easier.

mesecons_mvps, mesecons_receiver and mesecons_random made use of
update_autoconnect, their code was also adapted. This also fixes a
receiver bug: If a receiver was placed with a onstate receptor next
to it (but not the wall lever / button that caused the receiver to
appear) the receiver didn't turn on in the past.

Also move documentation for mesecon wire into mesecons_wire.

5 files changed, 249 insertions, 0 deletions

diff --git a/mesecons_wires/depends.txt b/mesecons_wires/depends.txt
new file mode 100644
index 0000000..acaa924
--- /dev/null
+++ b/mesecons_wires/depends.txt
@@ -0,0 +1 @@
+mesecons
diff --git a/mesecons_wires/doc/mesecon/description.html b/mesecons_wires/doc/mesecon/description.html
new file mode 100644
index 0000000..f217be9
--- /dev/null
+++ b/mesecons_wires/doc/mesecon/description.html
@@ -0,0 +1 @@
+Mesecons are the wires, use them to connect effectors with receptors.
diff --git a/mesecons_wires/doc/mesecon/preview.png b/mesecons_wires/doc/mesecon/preview.png
new file mode 100755
index 0000000..f81e5cb
--- /dev/null
+++ b/mesecons_wires/doc/mesecon/preview.png
diff --git a/mesecons_wires/doc/mesecon/recipe.png b/mesecons_wires/doc/mesecon/recipe.png
new file mode 100644
index 0000000..72f9210
--- /dev/null
+++ b/mesecons_wires/doc/mesecon/recipe.png
diff --git a/mesecons_wires/init.lua b/mesecons_wires/init.lua
new file mode 100644
index 0000000..879cfa1
--- /dev/null
+++ b/mesecons_wires/init.lua
@@ -0,0 +1,247 @@
+-- naming scheme: wire:(xp)(zp)(xm)(zm)(xpyp)(zpyp)(xmyp)(zmyp)_on/off
+-- where x= x direction, z= z direction, y= y direction, p = +1, m = -1, e.g. xpym = {x=1, y=-1, z=0}
+-- The (xp)/(zpyp)/.. statements shall be replaced by either 0 or 1
+-- Where 0 means the wire has no visual connection to that direction and
+-- 1 means that the wire visually connects to that other node.
+
+-- #######################
+-- ## Update wire looks ##
+-- #######################
+
+-- self_pos = pos of any mesecon node, from_pos = pos of conductor to getconnect for
+local wire_getconnect = function (from_pos, self_pos)
+	local node = minetest.get_node(self_pos)
+	if minetest.registered_nodes[node.name]
+	and minetest.registered_nodes[node.name].mesecons then
+		-- rules of node to possibly connect to
+		local rules = {}
+		if (minetest.registered_nodes[node.name].mesecon_wire) then
+			rules = mesecon.rules.default
+		else
+			rules = mesecon.get_any_rules(node)
+		end
+
+		for _, r in ipairs(mesecon.flattenrules(rules)) do
+			if (vector.equals(vector.add(self_pos, r), from_pos)) then
+				return true
+			end
+		end
+	end
+	return false
+end
+
+-- Update this node
+local wire_updateconnect = function (pos)
+	local connections = {}
+
+	for _, r in ipairs(mesecon.rules.default) do
+		if wire_getconnect(pos, vector.add(pos, r)) then
+			table.insert(connections, r)
+		end
+	end
+
+	local nid = {}
+	for _, vec in ipairs(connections) do
+		-- flat component
+		if vec.x ==  1 then nid[0] = "1" end
+		if vec.z ==  1 then nid[1] = "1" end
+		if vec.x == -1 then nid[2] = "1" end
+		if vec.z == -1 then nid[3] = "1"  end
+
+		-- slopy component
+		if vec.y == 1 then
+			if vec.x ==  1 then nid[4] = "1" end
+			if vec.z ==  1 then nid[5] = "1" end
+			if vec.x == -1 then nid[6] = "1" end
+			if vec.z == -1 then nid[7] = "1" end
+		end
+	end
+
+	local nodeid = 	  (nid[0] or "0")..(nid[1] or "0")..(nid[2] or "0")..(nid[3] or "0")
+			..(nid[4] or "0")..(nid[5] or "0")..(nid[6] or "0")..(nid[7] or "0")
+
+	local state_suffix = string.find(minetest.get_node(pos).name, "_off") and "_off" or "_on"
+	minetest.set_node(pos, {name = "mesecons:wire_"..nodeid..state_suffix})
+end
+
+local update_on_place_dig = function (pos, node)
+	-- Update placed node (get_node again as it may have been dug)
+	local nn = minetest.get_node(pos)
+	if (minetest.registered_nodes[nn.name])
+	and (minetest.registered_nodes[nn.name].mesecon_wire) then
+		wire_updateconnect(pos)
+	end
+
+	-- Update nodes around it
+	local rules = {}
+	if minetest.registered_nodes[node.name]
+	and minetest.registered_nodes[node.name].mesecon_wire then
+		rules = mesecon.rules.default
+	else
+		rules = mesecon.get_any_rules(node)
+	end
+	if (not rules) then return end
+
+	for _, r in ipairs(mesecon.flattenrules(rules)) do
+		local np = vector.add(pos, r)
+		if minetest.registered_nodes[minetest.get_node(np).name]
+		and minetest.registered_nodes[minetest.get_node(np).name].mesecon_wire then
+			wire_updateconnect(np)
+		end
+	end
+end
+
+mesecon.register_autoconnect_hook("wire", update_on_place_dig)
+
+-- ############################
+-- ## Wire node registration ##
+-- ############################
+-- Nodeboxes:
+local box_center = {-1/16, -.5, -1/16, 1/16, -.5+1/16, 1/16}
+local box_bump1 =  { -2/16, -8/16,  -2/16, 2/16, -13/32, 2/16 }
+
+local nbox_nid =
+{
+	[0] = {1/16, -.5, -1/16, 8/16, -.5+1/16, 1/16}, -- x positive
+	[1] = {-1/16, -.5, 1/16, 1/16, -.5+1/16, 8/16}, -- z positive
+	[2] = {-8/16, -.5, -1/16, -1/16, -.5+1/16, 1/16}, -- x negative
+	[3] = {-1/16, -.5, -8/16, 1/16, -.5+1/16, -1/16}, -- z negative
+
+	[4] = {.5-1/16, -.5+1/16, -1/16, .5, .4999+1/16, 1/16}, -- x positive up
+	[5] = {-1/16, -.5+1/16, .5-1/16, 1/16, .4999+1/16, .5}, -- z positive up
+	[6] = {-.5, -.5+1/16, -1/16, -.5+1/16, .4999+1/16, 1/16}, -- x negative up
+	[7] = {-1/16, -.5+1/16, -.5, 1/16, .4999+1/16, -.5+1/16}  -- z negative up
+}
+
+local tiles_off = { "mesecons_wire_off.png" }
+local tiles_on = { "mesecons_wire_on.png" }
+
+local selectionbox =
+{
+	type = "fixed",
+	fixed = {-.5, -.5, -.5, .5, -.5+4/16, .5}
+}
+
+-- go to the next nodeid (ex.: 01000011 --> 01000100)
+local nid_inc = function() end
+nid_inc = function (nid)
+	local i = 0
+	while nid[i-1] ~= 1 do
+		nid[i] = (nid[i] ~= 1) and 1 or 0
+		i = i + 1
+	end
+
+	-- BUT: Skip impossible nodeids:
+	if ((nid[0] == 0 and nid[4] == 1) or (nid[1] == 0 and nid[5] == 1)
+	or (nid[2] == 0 and nid[6] == 1) or (nid[3] == 0 and nid[7] == 1)) then
+		return nid_inc(nid)
+	end
+
+	return i <= 8
+end
+
+register_wires = function()
+	local nid = {}
+	while true do
+		-- Create group specifiction and nodeid string (see note above for details)
+		local nodeid = 	  (nid[0] or "0")..(nid[1] or "0")..(nid[2] or "0")..(nid[3] or "0")
+				..(nid[4] or "0")..(nid[5] or "0")..(nid[6] or "0")..(nid[7] or "0")
+
+		-- Calculate nodebox
+		local nodebox = {type = "fixed", fixed={box_center}}
+		for i=0,7 do
+			if nid[i] == 1 then
+				table.insert(nodebox.fixed, nbox_nid[i])
+			end
+		end
+
+		-- Add bump to nodebox if curved
+		if (nid[0] == 1 and nid[1] == 1) or (nid[1] == 1 and nid[2] == 1)
+		or (nid[2] == 1 and nid[3] == 1) or (nid[3] == 1 and nid[0] == 1) then
+			table.insert(nodebox.fixed, box_bump1)
+		end
+
+		-- If nothing to connect to, still make a nodebox of a straight wire
+		if nodeid == "00000000" then
+			nodebox.fixed = {-8/16, -.5, -1/16, 8/16, -.5+1/16, 1/16}
+		end
+
+		local rules = {}
+		if (nid[0] == 1) then table.insert(rules, vector.new( 1,  0,  0)) end
+		if (nid[1] == 1) then table.insert(rules, vector.new( 0,  0,  1)) end
+		if (nid[2] == 1) then table.insert(rules, vector.new(-1,  0,  0)) end
+		if (nid[3] == 1) then table.insert(rules, vector.new( 0,  0, -1)) end
+
+		if (nid[0] == 1) then table.insert(rules, vector.new( 1, -1,  0)) end
+		if (nid[1] == 1) then table.insert(rules, vector.new( 0, -1,  1)) end
+		if (nid[2] == 1) then table.insert(rules, vector.new(-1, -1,  0)) end
+		if (nid[3] == 1) then table.insert(rules, vector.new( 0, -1, -1)) end
+
+		if (nid[4] == 1) then table.insert(rules, vector.new( 1,  1,  0)) end
+		if (nid[5] == 1) then table.insert(rules, vector.new( 0,  1,  1)) end
+		if (nid[6] == 1) then table.insert(rules, vector.new(-1,  1,  0)) end
+		if (nid[7] == 1) then table.insert(rules, vector.new( 0,  1, -1)) end
+
+		local meseconspec_off = { conductor = {
+			rules = rules,
+			state = mesecon.state.off,
+			onstate = "mesecons:wire_"..nodeid.."_on"
+		}}
+
+		local meseconspec_on = { conductor = {
+			rules = rules,
+			state = mesecon.state.on,
+			offstate = "mesecons:wire_"..nodeid.."_off"
+		}}
+
+		local groups_on = {dig_immediate = 3, mesecon_conductor_craftable = 1,
+			not_in_creative_inventory = 1}
+		local groups_off = {dig_immediate = 3, mesecon_conductor_craftable = 1}
+		if nodeid ~= "00000000" then
+			groups_off["not_in_creative_inventory"] = 1
+		end
+
+		mesecon.register_node(":mesecons:wire_"..nodeid, {
+			description = "Mesecon",
+			drawtype = "nodebox",
+			inventory_image = "mesecons_wire_inv.png",
+			wield_image = "mesecons_wire_inv.png",
+			paramtype = "light",
+			paramtype2 = "facedir",
+			sunlight_propagates = true,
+			selection_box = selectionbox,
+			node_box = nodebox,
+			walkable = false,
+			drop = "mesecons:wire_00000000_off",
+			mesecon_wire = true
+		}, {tiles = tiles_off, mesecons = meseconspec_off, groups = groups_off},
+		{tiles = tiles_on, mesecons = meseconspec_on, groups = groups_on})
+
+		if (nid_inc(nid) == false) then return end
+	end
+end
+register_wires()
+
+-- ##############
+-- ## Crafting ##
+-- ##############
+minetest.register_craft({
+	type = "cooking",
+	output = "mesecons:wire_00000000_off 2",
+	recipe = "default:mese_crystal_fragment",
+	cooktime = 3,
+})
+
+minetest.register_craft({
+	type = "cooking",
+	output = "mesecons:wire_00000000_off 18",
+	recipe = "default:mese_crystal",
+	cooktime = 15,
+})
+
+minetest.register_craft({
+	type = "cooking",
+	output = "mesecons:wire_00000000_off 162",
+	recipe = "default:mese",
+	cooktime = 30,
+})