allow mods to pass a function or just true

to the pole and horiz pole check routines, in case they need
their own, custom checking routines, if the usual, simple
checks aren't good enough.

got rid of the allowed-poles table, as it's now obsolete

moved all existing special code into compat.lua, altered to
use this feature.

api.lua

@@ -6,7 +6,6 @@ signs_lib.lbm_restore_nodes = {}
 signs_lib.old_fenceposts = {}
 signs_lib.old_fenceposts_replacement_signs = {}
 signs_lib.old_fenceposts_with_signs = {}
-signs_lib.allowed_poles = {}
 
 -- Settings used for a standard wood or steel wall sign
 signs_lib.standard_lines = 6
@@ -152,78 +151,6 @@ signs_lib.flip_walldir = {
 	[5] = 4
 }
 
-local htj_north = {
-	[1] = true,
-	[3] = true,
-	[9] = true,
-	[11] = true,
-	[21] = true,
-	[23] = true
-}
-
-local htj_east = {
-	[0] = true,
-	[2] = true,
-	[16] = true,
-	[18] = true,
-	[20] = true,
-	[22] = true
-}
-
-local htj_south = {
-	[1] = true,
-	[3] = true,
-	[5] = true,
-	[7] = true,
-	[21] = true,
-	[23] = true
-}
-
-local htj_west = {
-	[0] = true,
-	[2] = true,
-	[12] = true,
-	[14] = true,
-	[20] = true,
-	[22] = true
-}
-
-local vtj_north = {
-	[8] = true,
-	[10] = true,
-	[13] = true,
-	[15] = true,
-	[17] = true,
-	[19] = true
-}
-
-local vtj_east = {
-	[4] = true,
-	[6] = true,
-	[8] = true,
-	[10] = true,
-	[17] = true,
-	[19] = true
-}
-
-local vtj_south = {
-	[4] = true,
-	[6] = true,
-	[13] = true,
-	[15] = true,
-	[17] = true,
-	[10] = true
-}
-
-local vtj_west = {
-	[4] = true,
-	[6] = true,
-	[8] = true,
-	[10] = true,
-	[13] = true,
-	[15] = true
-}
-
 -- Initialize character texture cache
 local ctexcache = {}
 
@@ -817,84 +744,38 @@ function signs_lib.make_selection_boxes(sizex, sizey, foo, xoffs, yoffs, zoffs,
 end
 
 function signs_lib.check_for_pole(pos, pointed_thing)
-	local node = minetest.get_node(pos)
-	local def = minetest.registered_items[node.name]
-
 	local ppos = minetest.get_pointed_thing_position(pointed_thing)
 	local pnode = minetest.get_node(ppos)
 	local pdef = minetest.registered_items[pnode.name]
 
-	if (signs_lib.allowed_poles[pnode.name]
+	if not pdef then return end
-	  or (pdef and pdef.drawtype == "fencelike")
+
-	  or string.find(pnode.name, "default:fence_")
+	if type(pdef.check_for_pole) == "function" then
+		local node = minetest.get_node(pos)
+		local def = minetest.registered_items[node.name]
+		return pdef.check_for_pole(pos, node, def, ppos, pnode, pdef)
+	elseif pdef.check_for_pole
+	  or pdef.drawtype == "fencelike"
 	  or string.find(pnode.name, "_post")
-	  or string.find(pnode.name, "fencepost")
+	  or string.find(pnode.name, "fencepost") then
-	  or string.find(pnode.name, "streets:streetlamp_basic_top")
-	  or (pnode.name == "streets:bigpole" and pnode.param2 < 4)
-	  or (pnode.name == "streets:bigpole" and pnode.param2 > 19 and pnode.param2 < 24) )
-	  and (pos.x ~= ppos.x or pos.z ~= ppos.z) then
 		return true
-	elseif pnode.name == "streets:bigpole_tjunction" then
-		if def.paramtype2 == "wallmounted" then
-			if   (node.param2 == 4 and vtj_north[pnode.param2])
-			  or (node.param2 == 2 and vtj_east[pnode.param2])
-			  or (node.param2 == 5 and vtj_south[pnode.param2])
-			  or (node.param2 == 3 and vtj_west[pnode.param2]) then
-				return true
-			end
-		else
-			if   (node.param2 == 0 and vtj_north[pnode.param2])
-			  or (node.param2 == 1 and vtj_east[pnode.param2])
-			  or (node.param2 == 2 and vtj_south[pnode.param2])
-			  or (node.param2 == 3 and vtj_west[pnode.param2]) then
-				return true
-			end
-		end
 	end
 end
 
 function signs_lib.check_for_horizontal_pole(pos, pointed_thing)
-	local node = minetest.get_node(pos)
-	local def = minetest.registered_items[node.name]
 	local ppos = minetest.get_pointed_thing_position(pointed_thing)
 	local pnode = minetest.get_node(ppos)
-	if pnode.name == "streets:bigpole" and pnode.param2 > 3 and pnode.param2 < 12 then
+	local pdef = minetest.registered_items[pnode.name]
-		if def.paramtype2 == "wallmounted" then
+
-			if node.param2 == 2 or node.param2 == 3 -- E/W
+	if not pdef then return end
-				then return true
+
-			end
+	if type(pdef.check_for_horiz_pole) == "function" then
-		else
+		local node = minetest.get_node(pos)
-			if node.param2 == 1 or node.param2 == 3 -- E/W
+		local def = minetest.registered_items[node.name]
-				then return true
+		return pdef.check_for_horiz_pole(pos, node, def, ppos, pnode, pdef)
-			end
+	elseif pdef.check_for_horiz_pole then
-		end
-	elseif pnode.name == "streets:bigpole" and pnode.param2 > 11 and pnode.param2 < 20 then
-		if def.paramtype2 == "wallmounted" then
-			if node.param2 == 4 or node.param2 == 5 then
 		return true
 	end
-		else
-			if node.param2 == 0 or node.param2 == 2 then
-				return true
-			end
-		end
-	elseif pnode.name == "streets:bigpole_tjunction" then
-		if def.paramtype2 == "wallmounted" then
-			if   (node.param2 == 4 and htj_north[pnode.param2])
-			  or (node.param2 == 2 and htj_east[pnode.param2])
-			  or (node.param2 == 5 and htj_south[pnode.param2])
-			  or (node.param2 == 3 and htj_west[pnode.param2]) then
-				return true
-			end
-		else
-			if   (node.param2 == 0 and htj_north[pnode.param2])
-			  or (node.param2 == 1 and htj_east[pnode.param2])
-			  or (node.param2 == 2 and htj_south[pnode.param2])
-			  or (node.param2 == 3 and htj_west[pnode.param2]) then
-				return true
-			end
-		end
-	end
 end
 
 function signs_lib.check_for_ceiling(pointed_thing)

compat.lua

@@ -0,0 +1,176 @@
+
+local default_fences = {
+	"default:fence_wood",
+	"default:fence_acacia_wood",
+	"default:fence_aspen_wood",
+	"default:fence_junglewood",
+	"default:fence_pine_wood"
+}
+
+for _, n in ipairs(default_fences) do
+	minetest.override_item(n, {
+		check_for_pole = true
+	})
+end
+
+if minetest.get_modpath("streetspoles") then
+
+	local htj_north = {
+		[1] = true,
+		[3] = true,
+		[9] = true,
+		[11] = true,
+		[21] = true,
+		[23] = true
+	}
+
+	local htj_east = {
+		[0] = true,
+		[2] = true,
+		[16] = true,
+		[18] = true,
+		[20] = true,
+		[22] = true
+	}
+
+	local htj_south = {
+		[1] = true,
+		[3] = true,
+		[5] = true,
+		[7] = true,
+		[21] = true,
+		[23] = true
+	}
+
+	local htj_west = {
+		[0] = true,
+		[2] = true,
+		[12] = true,
+		[14] = true,
+		[20] = true,
+		[22] = true
+	}
+
+	local vtj_north = {
+		[8] = true,
+		[10] = true,
+		[13] = true,
+		[15] = true,
+		[17] = true,
+		[19] = true
+	}
+
+	local vtj_east = {
+		[4] = true,
+		[6] = true,
+		[8] = true,
+		[10] = true,
+		[17] = true,
+		[19] = true
+	}
+
+	local vtj_south = {
+		[4] = true,
+		[6] = true,
+		[13] = true,
+		[15] = true,
+		[17] = true,
+		[10] = true
+	}
+
+	local vtj_west = {
+		[4] = true,
+		[6] = true,
+		[8] = true,
+		[10] = true,
+		[13] = true,
+		[15] = true
+	}
+
+	minetest.override_item("streets:bigpole", {
+		check_for_pole = function(pos, node, def, ppos, pnode, pdef)
+			if pnode.param2 < 4
+			  or (pnode.param2 > 19 and pnode.param2 < 24)
+			  and (pos.x ~= ppos.x or pos.z ~= ppos.z) then
+				return true
+			end
+		end,
+
+		check_for_horiz_pole = function(pos, node, def, ppos, pnode, pdef)
+			if pnode.param2 > 3 and pnode.param2 < 12 then
+				if def.paramtype2 == "wallmounted" then
+					if node.param2 == 2 or node.param2 == 3 -- E/W
+						then return true
+					end
+				else
+					if node.param2 == 1 or node.param2 == 3 -- E/W
+						then return true
+					end
+				end
+			elseif pnode.param2 > 11 and pnode.param2 < 20 then
+				if def.paramtype2 == "wallmounted" then
+					if node.param2 == 4 or node.param2 == 5 then
+						return true
+					end
+				else
+					if node.param2 == 0 or node.param2 == 2 then
+						return true
+					end
+				end
+			end
+		end
+	})
+
+	minetest.override_item("streets:bigpole_tjunction", {
+		check_for_pole = function(pos, node, def, ppos, pnode, pdef)
+			if def.paramtype2 == "wallmounted" then
+				if   (node.param2 == 4 and vtj_north[pnode.param2])
+				  or (node.param2 == 2 and vtj_east[pnode.param2])
+				  or (node.param2 == 5 and vtj_south[pnode.param2])
+				  or (node.param2 == 3 and vtj_west[pnode.param2]) then
+					return true
+				end
+			else
+				if   (node.param2 == 0 and vtj_north[pnode.param2])
+				  or (node.param2 == 1 and vtj_east[pnode.param2])
+				  or (node.param2 == 2 and vtj_south[pnode.param2])
+				  or (node.param2 == 3 and vtj_west[pnode.param2]) then
+					return true
+				end
+			end
+		end,
+
+		check_for_horiz_pole = function(pos, node, def, ppos, pnode, pdef)
+			if def.paramtype2 == "wallmounted" then
+				if   (node.param2 == 4 and htj_north[pnode.param2])
+				  or (node.param2 == 2 and htj_east[pnode.param2])
+				  or (node.param2 == 5 and htj_south[pnode.param2])
+				  or (node.param2 == 3 and htj_west[pnode.param2]) then
+					return true
+				end
+			else
+				if   (node.param2 == 0 and htj_north[pnode.param2])
+				  or (node.param2 == 1 and htj_east[pnode.param2])
+				  or (node.param2 == 2 and htj_south[pnode.param2])
+				  or (node.param2 == 3 and htj_west[pnode.param2]) then
+					return true
+				end
+			end
+		end
+	})
+
+end
+
+if minetest.get_modpath("streetlamps") then
+	minetest.override_item("streets:streetlamp_basic_top_on", {
+		selection_box = {
+			type = "fixed",
+			fixed = {
+				{-0.3,-0.4,-0.3,0.3,0.5,0.3},
+				{-0.15,-0.4,-0.15,0.15,-1.55,0.15},
+				{-0.18,-1.55,-0.18,0.18,-2.5,0.18},
+			}
+		},
+		check_for_pole = true
+	})
+end

depends.txt

@@ -1,3 +1,5 @@
 default
 intllib?
 screwdriver?
+streetspoles?
+streetlamps?

init.lua

@@ -13,3 +13,4 @@ signs_lib.gettext = S
 dofile(signs_lib.path.."/api.lua")
 dofile(signs_lib.path.."/encoding.lua")
 dofile(signs_lib.path.."/standard_signs.lua")
+dofile(signs_lib.path.."/compat.lua")