in fact, just bail out if the sign needs no entity

minor re-factor as needed for that
don't store entities statically, let the LBM generate them.

this works around Minetest's reload-positioning inaccuracy at very large
positive or negative X/Z coords (tested -18000/+18000 at all four corners,
both new signs and after reboot)

.gitignore

@@ -0,0 +1,7 @@
+# temporary files
+*~
+
+# eclipse project files
+.project
+.settings
+.buildpath

LICENSE

@@ -0,0 +1,600 @@
+License for code: LGPL 3.0
+License for media and all other assets:  CC-by-SA 4.0
+
+###############################################################################
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+                       Version 3, 29 June 2007
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api.lua

@@ -0,0 +1,970 @@
+-- signs_lib api, backported from street_signs
+
+local S = signs_lib.gettext
+
+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
+signs_lib.standard_hscale = 1
+signs_lib.standard_vscale = 1
+signs_lib.standard_lspace = 1
+signs_lib.standard_fsize = 15
+signs_lib.standard_xoffs = 4
+signs_lib.standard_yoffs = 0
+signs_lib.standard_cpl = 35
+
+signs_lib.standard_wood_groups = table.copy(minetest.registered_items["default:sign_wall_wood"].groups)
+signs_lib.standard_wood_groups.sign = 1
+signs_lib.standard_wood_groups.attached_node = nil
+
+signs_lib.standard_steel_groups = table.copy(minetest.registered_items["default:sign_wall_steel"].groups)
+signs_lib.standard_steel_groups.sign = 1
+signs_lib.standard_steel_groups.attached_node = nil
+
+signs_lib.standard_wood_sign_sounds  = table.copy(minetest.registered_items["default:sign_wall_wood"].sounds)
+signs_lib.standard_steel_sign_sounds = table.copy(minetest.registered_items["default:sign_wall_steel"].sounds)
+
+signs_lib.default_text_scale = {x=10, y=10}
+
+signs_lib.standard_yaw = {
+	0,
+	math.pi / -2,
+	math.pi,
+	math.pi / 2,
+}
+
+signs_lib.wallmounted_yaw = {
+	nil,
+	nil,
+	math.pi / -2,
+	math.pi / 2,
+	0,
+	math.pi,
+}
+
+signs_lib.fdir_to_back = {
+	{  0, -1 },
+	{ -1,  0 },
+	{  0,  1 },
+	{  1,  0 },
+}
+
+signs_lib.wall_fdir_to_back = {
+	nil,
+	nil,
+	{  0,  1 },
+	{  0, -1 },
+	{ -1,  0 },
+	{  1,  0 },
+}
+
+signs_lib.rotate_facedir = {
+	[0] = 1,
+	[1] = 6,
+	[2] = 3,
+	[3] = 0,
+	[4] = 2,
+	[5] = 6,
+	[6] = 4
+}
+
+signs_lib.rotate_walldir = {
+	[0] = 1,
+	[1] = 5,
+	[2] = 0,
+	[3] = 4,
+	[4] = 2,
+	[5] = 3
+}
+
+-- Initialize character texture cache
+local ctexcache = {}
+
+-- entity handling
+
+minetest.register_entity("signs_lib:text", {
+	collisionbox = { 0, 0, 0, 0, 0, 0 },
+	visual = "mesh",
+	mesh = "signs_lib_standard_wall_sign_entity.obj",
+	textures = {},
+	static_save = false
+})
+
+function signs_lib.delete_objects(pos)
+	local objects = minetest.get_objects_inside_radius(pos, 0.5)
+	for _, v in ipairs(objects) do
+		v:remove()
+	end
+end
+
+function signs_lib.spawn_entity(pos, texture)
+	local node = minetest.get_node(pos)
+	local def = minetest.registered_items[node.name]
+	if not def or not def.entity_info or not def.entity_info.yaw[node.param2 + 1] then return end
+
+	local text_scale = (node and node.text_scale) or signs_lib.default_text_scale
+	local objects = minetest.get_objects_inside_radius(pos, 0.5)
+	local obj
+
+	if #objects > 0 then
+		obj = objects[1]
+	else
+		obj = minetest.add_entity(pos, "signs_lib:text")
+	end
+
+	obj:setyaw(def.entity_info.yaw[node.param2 + 1])
+
+	if not texture then
+		obj:set_properties({
+			mesh = def.entity_info.mesh,
+			visual_size = text_scale,
+		})
+	else
+		obj:set_properties({
+			mesh = def.entity_info.mesh,
+			visual_size = text_scale,
+			textures={texture},
+		})
+	end
+end
+
+-- rotation
+
+function signs_lib.wallmounted_rotate(pos, node, user, mode)
+	if not signs_lib.can_modify(pos, user) then return false end
+
+	if mode ~= screwdriver.ROTATE_FACE or string.match(node.name, "_onpole") then
+		return false
+	end
+
+	local newparam2 = signs_lib.rotate_walldir[node.param2] or 0
+
+	minetest.swap_node(pos, { name = node.name, param2 = newparam2 })
+	signs_lib.delete_objects(pos)
+	signs_lib.update_sign(pos)
+	return true
+end
+
+function signs_lib.facedir_rotate(pos, node, user, mode)
+	if not signs_lib.can_modify(pos, user) then return false end
+
+	if mode ~= screwdriver.ROTATE_FACE or string.match(node.name, "_onpole") then
+		return false
+	end
+
+	local newparam2 = signs_lib.rotate_facedir[node.param2] or 0
+
+	minetest.swap_node(pos, { name = node.name, param2 = newparam2 })
+	signs_lib.delete_objects(pos)
+	signs_lib.update_sign(pos)
+	return true
+end
+
+-- infinite stacks
+
+if not minetest.settings:get_bool("creative_mode") then
+	signs_lib.expect_infinite_stacks = false
+else
+	signs_lib.expect_infinite_stacks = true
+end
+
+-- CONSTANTS
+
+-- Path to the textures.
+local TP = signs_lib.path .. "/textures"
+-- Font file formatter
+local CHAR_FILE = "%s_%02x.png"
+-- Fonts path
+local CHAR_PATH = TP .. "/" .. CHAR_FILE
+
+-- Lots of overkill here. KISS advocates, go away, shoo! ;) -- kaeza
+
+local PNG_HDR = string.char(0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A)
+
+-- check if a file does exist
+-- to avoid reopening file after checking again
+-- pass TRUE as second argument
+local function file_exists(name, return_handle, mode)
+	mode = mode or "r";
+	local f = io.open(name, mode)
+	if f ~= nil then
+		if (return_handle) then
+			return f
+		end
+		io.close(f) 
+		return true 
+	else 
+		return false 
+	end
+end
+
+-- Read the image size from a PNG file.
+-- Returns image_w, image_h.
+-- Only the LSB is read from each field!
+function signs_lib.read_image_size(filename)
+	local f = file_exists(filename, true, "rb")
+	-- file might not exist (don't crash the game)
+	if (not f) then
+		return 0, 0
+	end
+	f:seek("set", 0x0)
+	local hdr = f:read(string.len(PNG_HDR))
+	if hdr ~= PNG_HDR then
+		f:close()
+		return
+	end
+	f:seek("set", 0x13)
+	local ws = f:read(1)
+	f:seek("set", 0x17)
+	local hs = f:read(1)
+	f:close()
+	return ws:byte(), hs:byte()
+end
+
+-- 4 rows, max 80 chars per, plus a bit of fudge to
+-- avoid excess trimming (e.g. due to color codes)
+
+local MAX_INPUT_CHARS = 400
+
+-- helper functions to trim sign text input/output
+
+local function trim_input(text)
+	return text:sub(1, math.min(MAX_INPUT_CHARS, text:len()))
+end
+
+local function build_char_db(font_size)
+
+	local cw = {}
+
+	-- To calculate average char width.
+	local total_width = 0
+	local char_count = 0
+
+	for c = 32, 255 do
+		local w, h = signs_lib.read_image_size(CHAR_PATH:format("signs_lib_font_"..font_size.."px", c))
+		if w and h then
+			local ch = string.char(c)
+			cw[ch] = w
+			total_width = total_width + w
+			char_count = char_count + 1
+		end
+	end
+
+	local cbw, cbh = signs_lib.read_image_size(TP.."/signs_lib_color_"..font_size.."px_n.png")
+	assert(cbw and cbh, "error reading bg dimensions")
+	return cw, cbw, cbh, (total_width / char_count)
+end
+
+signs_lib.charwidth15,
+signs_lib.colorbgw15,
+signs_lib.lineheight15,
+signs_lib.avgwidth15 = build_char_db(15)
+
+signs_lib.charwidth31,
+signs_lib.colorbgw31,
+signs_lib.lineheight31,
+signs_lib.avgwidth31 = build_char_db(31)
+
+local sign_groups = {choppy=2, dig_immediate=2}
+local fences_with_sign = { }
+
+-- some local helper functions
+
+local math_max = math.max
+
+local function fill_line(x, y, w, c, font_size, colorbgw)
+	c = c or "0"
+	local tex = { }
+	for xx = 0, math.max(0, w), colorbgw do
+		table.insert(tex, (":%d,%d=signs_lib_color_"..font_size.."px_%s.png"):format(x + xx, y, c))
+	end
+	return table.concat(tex)
+end
+
+-- make char texture file name
+-- if texture file does not exist use fallback texture instead
+local function char_tex(font_name, ch)
+	if ctexcache[font_name..ch] then
+		return ctexcache[font_name..ch], true
+	else
+		local c = ch:byte()
+		local exists, tex = file_exists(CHAR_PATH:format(font_name, c))
+		if exists and c ~= 14 then
+			tex = CHAR_FILE:format(font_name, c)
+		else
+			tex = CHAR_FILE:format(font_name, 0x0)
+		end
+		ctexcache[font_name..ch] = tex
+		return tex, exists
+	end
+end
+
+local function make_line_texture(line, lineno, pos, line_width, line_height, cwidth_tab, font_size, colorbgw)
+	local width = 0
+	local maxw = 0
+	local font_name = "signs_lib_font_"..font_size.."px"
+
+	local words = { }
+	local node = minetest.get_node(pos)
+	local def = minetest.registered_items[node.name]
+	local default_color = def.default_color or 0
+
+	local cur_color = tonumber(default_color, 16)
+
+	-- We check which chars are available here.
+	for word_i, word in ipairs(line) do
+		local chars = { }
+		local ch_offs = 0
+		word = string.gsub(word, "%^[12345678abcdefgh]", {
+			["^1"] = string.char(0x81),
+			["^2"] = string.char(0x82),
+			["^3"] = string.char(0x83),
+			["^4"] = string.char(0x84),
+			["^5"] = string.char(0x85),
+			["^6"] = string.char(0x86),
+			["^7"] = string.char(0x87),
+			["^8"] = string.char(0x88),
+			["^a"] = string.char(0x8a),
+			["^b"] = string.char(0x8b),
+			["^c"] = string.char(0x8c),
+			["^d"] = string.char(0x8d),
+			["^e"] = string.char(0x8e),
+			["^f"] = string.char(0x8f),
+			["^g"] = string.char(0x90),
+			["^h"] = string.char(0x91)
+		})
+		local word_l = #word
+		local i = 1
+		while i <= word_l  do
+			local c = word:sub(i, i)
+			if c == "#" then
+				local cc = tonumber(word:sub(i+1, i+1), 16)
+				if cc then
+					i = i + 1
+					cur_color = cc
+				end
+			else
+				local w = cwidth_tab[c]
+				if w then
+					width = width + w + 1
+					if width >= (line_width - cwidth_tab[" "]) then
+						width = 0
+					else
+						maxw = math_max(width, maxw)
+					end
+					if #chars < MAX_INPUT_CHARS then
+						table.insert(chars, {
+							off = ch_offs,
+							tex = char_tex(font_name, c),
+							col = ("%X"):format(cur_color),
+						})
+					end
+					ch_offs = ch_offs + w
+				end
+			end
+			i = i + 1
+		end
+		width = width + cwidth_tab[" "] + 1
+		maxw = math_max(width, maxw)
+		table.insert(words, { chars=chars, w=ch_offs })
+	end
+
+	-- Okay, we actually build the "line texture" here.
+
+	local texture = { }
+
+	local start_xpos = math.floor((line_width - maxw) / 2) + def.x_offset
+
+	local xpos = start_xpos
+	local ypos = (line_height + def.line_spacing)* lineno + def.y_offset
+
+	cur_color = nil
+
+	for word_i, word in ipairs(words) do
+		local xoffs = (xpos - start_xpos)
+		if (xoffs > 0) and ((xoffs + word.w) > maxw) then
+			table.insert(texture, fill_line(xpos, ypos, maxw, "n", font_size, colorbgw))
+			xpos = start_xpos
+			ypos = ypos + line_height + def.line_spacing
+			lineno = lineno + 1
+			if lineno >= def.number_of_lines then break end
+			table.insert(texture, fill_line(xpos, ypos, maxw, cur_color, font_size, colorbgw))
+		end
+		for ch_i, ch in ipairs(word.chars) do
+			if ch.col ~= cur_color then
+				cur_color = ch.col
+				table.insert(texture, fill_line(xpos + ch.off, ypos, maxw, cur_color, font_size, colorbgw))
+			end
+			table.insert(texture, (":%d,%d=%s"):format(xpos + ch.off, ypos, ch.tex))
+		end
+		table.insert(
+			texture, 
+			(":%d,%d="):format(xpos + word.w, ypos) .. char_tex(font_name, " ")
+		)
+		xpos = xpos + word.w + cwidth_tab[" "]
+		if xpos >= (line_width + cwidth_tab[" "]) then break end
+	end
+
+	table.insert(texture, fill_line(xpos, ypos, maxw, "n", font_size, colorbgw))
+	table.insert(texture, fill_line(start_xpos, ypos + line_height, maxw, "n", font_size, colorbgw))
+
+	return table.concat(texture), lineno
+end
+
+local function make_sign_texture(lines, pos)
+	local node = minetest.get_node(pos)
+	local def = minetest.registered_items[node.name]
+	if not def or not def.entity_info then return end
+
+	local font_size
+	local line_width
+	local line_height
+	local char_width
+	local colorbgw
+
+	if def.font_size and def.font_size == 31 then
+		font_size = 31
+		line_width = math.floor(signs_lib.avgwidth31 * def.chars_per_line) * def.horiz_scaling
+		line_height = signs_lib.lineheight31
+		char_width = signs_lib.charwidth31
+		colorbgw = signs_lib.colorbgw31
+	else
+		font_size = 15
+		line_width = math.floor(signs_lib.avgwidth15 * def.chars_per_line) * def.horiz_scaling
+		line_height = signs_lib.lineheight15
+		char_width = signs_lib.charwidth15
+		colorbgw = signs_lib.colorbgw15
+	end
+
+	local texture = { ("[combine:%dx%d"):format(line_width, (line_height + def.line_spacing) * def.number_of_lines * def.vert_scaling) }
+
+	local lineno = 0
+	for i = 1, #lines do
+		if lineno >= def.number_of_lines then break end
+		local linetex, ln = make_line_texture(lines[i], lineno, pos, line_width, line_height, char_width, font_size, colorbgw)
+		table.insert(texture, linetex)
+		lineno = ln + 1
+	end
+	table.insert(texture, "^[makealpha:0,0,0")
+	return table.concat(texture, "")
+end
+
+function signs_lib.split_lines_and_words(text)
+	if not text then return end
+	local lines = { }
+	for _, line in ipairs(text:split("\n")) do
+		table.insert(lines, line:split(" "))
+	end
+	return lines
+end
+
+function signs_lib.set_obj_text(pos, text)
+	local split = signs_lib.split_lines_and_words
+	local text_ansi = Utf8ToAnsi(text)
+	local n = minetest.registered_nodes[minetest.get_node(pos).name]
+	signs_lib.delete_objects(pos)
+	signs_lib.spawn_entity(pos, make_sign_texture(split(text_ansi), pos))
+end
+
+local function make_widefont_nodename(name)
+	if string.find(name, "_widefont") then return name end
+	if string.find(name, "_onpole")  then
+		return string.gsub(name, "_onpole", "_widefont_onpole")
+	elseif string.find(name, "_hanging") then
+		return string.gsub(name, "_hanging", "_widefont_hanging")
+	else
+		return name.."_widefont"
+	end
+end
+
+function signs_lib.construct_sign(pos)
+	local form = "size[6,4]"..
+		"textarea[0,-0.3;6.5,3;text;;${text}]"..
+		"background[-0.5,-0.5;7,5;signs_lib_sign_bg.jpg]"
+	local node = minetest.get_node(pos)
+	local wname = make_widefont_nodename(node.name)
+
+	if minetest.registered_items[wname] then
+		local state = "off"
+		if string.find(node.name, "widefont") then state = "on" end
+		form = form.."label[1,3.4;Use wide font]"..
+			"image_button[1.1,3.7;1,0.6;signs_lib_switch_"..
+			state..".png;"..
+			state..";;;false;signs_lib_switch_interm.png]"..
+			"button_exit[3,3.4;2,1;ok;"..S("Write").."]"
+	else
+		form = form.."button_exit[2,3.4;2,1;ok;"..S("Write").."]"
+	end
+
+	local meta = minetest.get_meta(pos)
+	meta:set_string("formspec", form)
+	local i = meta:get_string("infotext")
+	if i == "" then -- it wasn't even set, so set it.
+		meta:set_string("infotext", "")
+	end
+end
+
+function signs_lib.destruct_sign(pos)
+	signs_lib.delete_objects(pos)
+end
+
+local function make_infotext(text)
+	text = trim_input(text)
+	local lines = signs_lib.split_lines_and_words(text) or {}
+	local lines2 = { }
+	for _, line in ipairs(lines) do
+		table.insert(lines2, (table.concat(line, " "):gsub("#[0-9a-fA-F]", ""):gsub("##", "#")))
+	end
+	return table.concat(lines2, "\n")
+end
+
+function signs_lib.update_sign(pos, fields)
+	local meta = minetest.get_meta(pos)
+
+	local text = fields and fields.text or meta:get_string("text")
+	text = trim_input(text)
+
+	local owner = meta:get_string("owner")
+	local ownstr = ""
+	if owner ~= "" then ownstr = S("Locked sign, owned by @1\n", owner) end
+
+	meta:set_string("text", text)
+	meta:set_string("infotext", ownstr..make_infotext(text).." ")
+	signs_lib.set_obj_text(pos, text)
+end
+
+function signs_lib.receive_fields(pos, formname, fields, sender)
+
+	if not fields or not signs_lib.can_modify(pos, sender) then return end
+
+	if fields.text and fields.ok then
+		minetest.log("action", S("@1 wrote \"@2\" to sign at @3",
+			(sender:get_player_name() or ""),
+			fields.text:gsub('\\', '\\\\'):gsub("\n", "\\n"),
+			minetest.pos_to_string(pos)
+		))
+		signs_lib.update_sign(pos, fields)
+	elseif fields.on or fields.off then
+		local node = minetest.get_node(pos)
+		local newname
+
+		if fields.on and string.find(node.name, "widefont") then
+			newname = string.gsub(node.name, "_widefont", "")
+		elseif fields.off and not string.find(node.name, "widefont") then
+			newname = make_widefont_nodename(node.name)
+		end
+		if newname then
+			minetest.log("action", S("@1 flipped the wide-font switch to \"@2\" at @3",
+				(sender:get_player_name() or ""),
+				(fields.on and "off" or "on"),
+				minetest.pos_to_string(pos)
+			))
+
+			minetest.swap_node(pos, {name = newname, param2 = node.param2})
+			signs_lib.construct_sign(pos)
+			signs_lib.update_sign(pos, fields)
+		end
+	end
+end
+
+function signs_lib.can_modify(pos, player)
+	local meta = minetest.get_meta(pos)
+	local owner = meta:get_string("owner")
+	local playername = player:get_player_name()
+
+	if minetest.is_protected(pos, playername) then 
+		minetest.record_protection_violation(pos, playername)
+		return false
+	end
+
+	if owner == ""
+	  or playername == owner
+	  or (minetest.check_player_privs(playername, {sign_editor=true}))
+	  or (playername == minetest.settings:get("name")) then
+		return true
+	end
+	minetest.record_protection_violation(pos, playername)
+	return false
+end
+
+-- make selection boxes
+-- sizex/sizey specified in inches because that's what MUTCD uses.
+
+function signs_lib.make_selection_boxes(sizex, sizey, foo, xoffs, yoffs, zoffs, is_facedir)
+
+	local tx = (sizex * 0.0254 ) / 2
+	local ty = (sizey * 0.0254 ) / 2
+	local xo = xoffs and xoffs * 0.0254 or 0
+	local yo = yoffs and yoffs * 0.0254 or 0
+	local zo = zoffs and zoffs * 0.0254 or 0
+
+	if not is_facedir then
+		return {
+			type = "wallmounted",
+			wall_side =   { -0.5 + zo, -ty + yo, -tx + xo, -0.4375 + zo, ty + yo, tx + xo },
+			wall_top =    { -tx - xo, 0.5 + zo, -ty + yo, tx - xo, 0.4375 + zo, ty + yo},
+			wall_bottom = { -tx - xo, -0.5 + zo, -ty + yo, tx - xo, -0.4375 + zo, ty + yo }
+		}
+	else
+		return {
+			type = "fixed",
+			fixed = { -tx + xo, -ty + yo, 0.5 + zo, tx + xo, ty + yo, 0.4375 + zo}
+		}
+	end
+end
+
+function signs_lib.check_for_pole(pos, pointed_thing)
+	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]
+		  or (pdef and pdef.drawtype == "fencelike")
+		  or string.find(pnode.name, "default:fence_")
+		  or string.find(pnode.name, "_post")
+		  or string.find(pnode.name, "fencepost")
+		  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
+	end
+end
+
+function signs_lib.check_for_ceiling(pointed_thing)
+	if pointed_thing.above.x == pointed_thing.under.x
+	  and pointed_thing.above.z == pointed_thing.under.z
+	  and pointed_thing.above.y < pointed_thing.under.y then
+		return true
+	end
+end
+
+function signs_lib.after_place_node(pos, placer, itemstack, pointed_thing, locked)
+	local playername = placer:get_player_name()
+	local def = minetest.registered_items[itemstack:get_name()]
+
+	local ppos = minetest.get_pointed_thing_position(pointed_thing)
+	local pnode = minetest.get_node(ppos)
+	local pdef = minetest.registered_items[pnode.name]
+
+	if (def.allow_onpole ~= false) and signs_lib.check_for_pole(pos, pointed_thing) then
+		local node = minetest.get_node(pos)
+		minetest.swap_node(pos, {name = itemstack:get_name().."_onpole", param2 = node.param2})
+	elseif def.allow_hanging and signs_lib.check_for_ceiling(pointed_thing) then
+		local newparam2 = minetest.dir_to_facedir(placer:get_look_dir())
+		local node = minetest.get_node(pos)
+		minetest.swap_node(pos, {name = itemstack:get_name().."_hanging", param2 = newparam2})
+	end
+	if locked then
+		local meta = minetest.get_meta(pos)
+		meta:set_string("owner", playername)
+		meta:set_string("infotext", S("Locked sign, owned by @1\n", playername))
+	end
+end
+
+function signs_lib.register_fence_with_sign()
+	minetest.log("warning", "[signs_lib] ".."Attempt to call no longer used function signs_lib.register_fence_with_sign()")
+end
+
+local function register_sign(name, rdef)
+	local def = table.copy(rdef)
+
+	if rdef.entity_info == "standard" then
+		def.entity_info = {
+			mesh = "signs_lib_standard_wall_sign_entity.obj",
+			yaw = signs_lib.wallmounted_yaw
+		}
+	elseif rdef.entity_info then
+		def.entity_info = rdef.entity_info
+	end
+
+	def.after_place_node = rdef.after_place_node or signs_lib.after_place_node
+
+	if rdef.entity_info then
+		def.on_rightclick       = rdef.on_rightclick       or signs_lib.construct_sign
+		def.on_construct        = rdef.on_construct        or signs_lib.construct_sign
+		def.on_destruct         = rdef.on_destruct         or signs_lib.destruct_sign
+		def.on_receive_fields   = rdef.on_receive_fields   or signs_lib.receive_fields
+		def.on_punch            = rdef.on_punch            or signs_lib.update_sign
+		def.number_of_lines     = rdef.number_of_lines     or signs_lib.standard_lines
+		def.horiz_scaling       = rdef.horiz_scaling       or signs_lib.standard_hscale
+		def.vert_scaling        = rdef.vert_scaling        or signs_lib.standard_vscale
+		def.line_spacing        = rdef.line_spacing        or signs_lib.standard_lspace
+		def.font_size           = rdef.font_size           or signs_lib.standard_fsize
+		def.x_offset            = rdef.x_offset            or signs_lib.standard_xoffs
+		def.y_offset            = rdef.y_offset            or signs_lib.standard_yoffs
+		def.chars_per_line      = rdef.chars_per_line      or signs_lib.standard_cpl
+		def.default_color       = rdef.default_color       or "0"
+		if rdef.locked and not rdef.after_place_node then
+			def.after_place_node = function(pos, placer, itemstack, pointed_thing)
+				signs_lib.after_place_node(pos, placer, itemstack, pointed_thing, true)
+			end
+		end
+	end
+
+	def.paramtype           = rdef.paramtype           or "light"
+	def.drawtype            = rdef.drawtype            or "mesh"
+	def.mesh                = rdef.mesh                or "signs_lib_standard_wall_sign.obj"
+	def.wield_image         = rdef.wield_image         or def.inventory_image
+	def.drop                = rdef.drop                or name
+	def.sounds              = rdef.sounds              or signs_lib.standard_wood_sign_sounds
+	def.on_rotate           = rdef.on_rotate           or signs_lib.wallmounted_rotate
+	def.paramtype2          = rdef.paramtype2          or "wallmounted"
+
+	if rdef.on_rotate then
+		def.on_rotate = rdef.on_rotate
+	elseif rdef.drawtype == "wallmounted" then
+		def.on_rotate = signs_lib.wallmounted_rotate
+	else
+		def.on_rotate = signs_lib.facedir_rotate
+	end
+
+	if rdef.groups then
+		def.groups = rdef.groups
+	else
+		def.groups = signs_lib.standard_wood_groups
+	end
+
+	local cbox = signs_lib.make_selection_boxes(35, 25, allow_onpole)
+
+	def.selection_box = rdef.selection_box or cbox
+	def.node_box      = table.copy(rdef.node_box or rdef.selection_box or cbox)
+
+	if def.sunlight_propagates ~= false then
+		def.sunlight_propagates = true
+	end
+
+	minetest.register_node(":"..name, def)
+	table.insert(signs_lib.lbm_restore_nodes, name)
+
+	if rdef.allow_onpole ~= false then
+
+		local opdef = table.copy(def)
+
+		local offset = 0.3125
+		if opdef.uses_slim_pole_mount then
+			offset = 0.35
+		end
+
+		opdef.selection_box = rdef.onpole_selection_box or opdef.selection_box
+		opdef.node_box = rdef.onpole_node_box or opdef.selection_box
+
+		if opdef.paramtype2 == "wallmounted" then
+			opdef.node_box.wall_side[1] = def.node_box.wall_side[1] - offset
+			opdef.node_box.wall_side[4] = def.node_box.wall_side[4] - offset
+
+			opdef.selection_box.wall_side[1] = def.selection_box.wall_side[1] - offset
+			opdef.selection_box.wall_side[4] = def.selection_box.wall_side[4] - offset
+		else
+			opdef.node_box.fixed[3] = def.node_box.fixed[3] + offset
+			opdef.node_box.fixed[6] = def.node_box.fixed[6] + offset
+
+			opdef.selection_box.fixed[3] = def.selection_box.fixed[3] + offset
+			opdef.selection_box.fixed[6] = def.selection_box.fixed[6] + offset
+		end
+
+		opdef.groups.not_in_creative_inventory = 1
+		opdef.tiles[3] = "signs_lib_pole_mount.png"
+		opdef.mesh = string.gsub(opdef.mesh, ".obj$", "_onpole.obj")
+		opdef.on_rotate = nil
+
+
+		if opdef.entity_info then
+			opdef.entity_info.mesh = string.gsub(opdef.entity_info.mesh, ".obj$", "_onpole.obj")
+		end
+		minetest.register_node(":"..name.."_onpole", opdef)
+		table.insert(signs_lib.lbm_restore_nodes, name.."_onpole")
+	end
+
+	if rdef.allow_hanging then
+
+		local hdef = table.copy(def)
+		hdef.paramtype2 = "facedir"
+
+		local hcbox = signs_lib.make_selection_boxes(35, 32, false, 0, 3, -18.5, true)
+
+		hdef.selection_box = rdef.hanging_selection_box or hcbox
+		hdef.node_box = rdef.hanging_node_box or rdef.hanging_selection_box or hcbox
+
+		hdef.groups.not_in_creative_inventory = 1
+		hdef.tiles[3] = "signs_lib_hangers.png"
+		hdef.mesh = string.gsub(string.gsub(hdef.mesh, "_facedir.obj", ".obj"), ".obj$", "_hanging.obj")
+		hdef.on_rotate = nil
+
+		if hdef.entity_info then
+			hdef.entity_info.mesh = string.gsub(string.gsub(hdef.entity_info.mesh, "_facedir.obj", ".obj"), ".obj$", "_hanging.obj")
+			hdef.entity_info.yaw = signs_lib.standard_yaw
+		end
+
+		minetest.register_node(":"..name.."_hanging", hdef)
+		table.insert(signs_lib.lbm_restore_nodes, name.."_hanging")
+	end
+end
+
+--[[
+The main sign registration function
+===================================
+
+Example minimal recommended def for writable signs:
+
+signs_lib.register_sign("foo:my_cool_sign", {
+	description = "Wooden cool sign",
+	inventory_image = "signs_lib_sign_cool_inv.png",
+	tiles = {
+		"signs_lib_sign_cool.png",
+		"signs_lib_sign_cool_edges.png"
+	},
+	number_of_lines = 2,
+	horiz_scaling = 0.8,
+	vert_scaling = 1,
+	line_spacing = 9,
+	font_size = 31,
+	x_offset = 7,
+	y_offset = 4,
+	chars_per_line = 40,
+	entity_info = "standard"
+})
+
+* default def assumes a wallmounted sign with on-pole being allowed.
+
+*For signs that can't support onpole, include in the def:
+	allow_onpole = false,
+
+* "standard" entity info implies the standard wood/steel sign model, in
+  wallmounted mode.  For facedir signs using the standard model, use:
+
+	entity_info = {
+		mesh = "signs_lib_standard_wall_sign_entity.obj",
+		yaw = signs_lib.standard_yaw
+	},
+
+]]--
+
+function signs_lib.register_sign(name, rdef)
+	register_sign(name, rdef)
+
+	if rdef.allow_widefont then
+
+		wdef = table.copy(minetest.registered_items[name])
+		wdef.groups.not_in_creative_inventory = 1
+		wdef.horiz_scaling = wdef.horiz_scaling / 2
+
+		register_sign(name.."_widefont", wdef)
+	end
+end
+
+-- restore signs' text after /clearobjects and the like, the next time
+-- a block is reloaded by the server.
+
+minetest.register_lbm({
+	nodenames = signs_lib.lbm_restore_nodes,
+	name = "signs_lib:restore_sign_text",
+	label = "Restore sign text",
+	run_at_every_load = true,
+	action = function(pos, node)
+		signs_lib.update_sign(pos,nil,nil,node)
+	end
+})
+
+-- Convert old signs on fenceposts into signs on.. um.. fence posts :P
+
+minetest.register_lbm({
+	nodenames = signs_lib.old_fenceposts_with_signs,
+	name = "signs_lib:fix_fencepost_signs",
+	label = "Change single-node signs on fences into normal",
+	run_at_every_load = true,
+	action = function(pos, node)
+
+		local fdir = node.param2 % 8
+		local signpos = {
+			x = pos.x + signs_lib.fdir_to_back[fdir+1][1],
+			y = pos.y,
+			z = pos.z + signs_lib.fdir_to_back[fdir+1][2]
+		}
+
+		if minetest.get_node(signpos).name == "air" then
+			local new_wmdir = minetest.dir_to_wallmounted(minetest.facedir_to_dir(fdir))
+			local oldfence =  signs_lib.old_fenceposts[node.name]
+			local newsign =   signs_lib.old_fenceposts_replacement_signs[node.name]
+
+			signs_lib.delete_objects(pos)
+
+			local oldmeta = minetest.get_meta(pos):to_table()
+			minetest.set_node(pos, {name = oldfence})
+			minetest.set_node(signpos, { name = newsign, param2 = new_wmdir })
+			local newmeta = minetest.get_meta(signpos)
+			newmeta:from_table(oldmeta)
+			signs_lib.update_sign(signpos)
+		end
+	end
+})
+
+signs_lib.block_list = {}
+signs_lib.totalblocks = 0
+
+-- Maintain a list of currently-loaded blocks
+minetest.register_lbm({
+	nodenames = {"group:sign"},
+	name = "signs_lib:update_block_list",
+	label = "Update list of loaded blocks, log only those with signs",
+	run_at_every_load = true,
+	action = function(pos, node)
+		-- yeah, yeah... I know I'm hashing a block pos, but it's still just a set of coords
+		local hash = minetest.hash_node_position(vector.floor(vector.divide(pos, core.MAP_BLOCKSIZE)))
+		if not signs_lib.block_list[hash] then
+			signs_lib.block_list[hash] = true
+			signs_lib.totalblocks = signs_lib.totalblocks + 1
+		end
+	end
+})
+
+minetest.register_chatcommand("regen_signs", {
+	params = "",
+	privs = {server = true},
+	description = "Skims through all currently-loaded sign-bearing mapblocks, clears away any entities within each sign's node space, and regenerates their text entities, if any.",
+	func = function(player_name, params)
+		local allsigns = {}
+		local totalsigns = 0
+		for b in pairs(signs_lib.block_list) do
+			local blockpos = minetest.get_position_from_hash(b)
+			local pos1 = vector.multiply(blockpos, core.MAP_BLOCKSIZE)
+			local pos2 = vector.add(pos1, core.MAP_BLOCKSIZE - 1)
+			if minetest.get_node_or_nil(vector.add(pos1, core.MAP_BLOCKSIZE/2)) then
+				local signs_in_block = minetest.find_nodes_in_area(pos1, pos2, {"group:sign"})
+				allsigns[#allsigns + 1] = signs_in_block
+				totalsigns = totalsigns + #signs_in_block
+			else
+				signs_lib.block_list[b] = nil -- if the block is no longer loaded, remove it from the table
+				signs_lib.totalblocks = signs_lib.totalblocks - 1
+			end
+		end
+		if signs_lib.totalblocks < 0 then signs_lib.totalblocks = 0 end
+		if totalsigns == 0 then
+			minetest.chat_send_player(player_name, "There are no signs in the currently-loaded terrain.")
+			signs_lib.block_list = {}
+			return
+		end
+
+		minetest.chat_send_player(player_name, "Found a total of "..totalsigns.." sign nodes across "..signs_lib.totalblocks.." blocks.")
+		minetest.chat_send_player(player_name, "Regenerating sign entities...")
+
+		for _, b in pairs(allsigns) do
+			for _, pos in ipairs(b) do
+				signs_lib.delete_objects(pos)
+				local node = minetest.get_node(pos)
+				local def = minetest.registered_items[node.name]
+				if def and def.entity_info then
+					signs_lib.update_sign(pos)
+				end
+			end
+		end
+		minetest.chat_send_player(player_name, "Finished.")
+	end
+})

copyright.txt

@@ -1,12 +1,4 @@
-Most code and all textures by Vanessa Ezekowitz.
+Most code and all textures by Vanessa Dannenberg.
 
 Some code copied and modified from the game's default mods (especially 
 doors) and ironzorg's flowers mod.
-
-Licenses: 
-* For the lua code, LGPL. 
-* For the door open/close sound, CC-By-SA 3.0 by Slanesh on freesound.org
-	http://freesound.org/people/Slanesh/sounds/31768/
-* For the gate open/close sound, CC0, by j1987 on freesound.org
-	http://freesound.org/people/j1987/sounds/106116/
-* For all images and everything else, WTFPL.

depends.txt

@@ -1,5 +1,3 @@
 default
 intllib?
 screwdriver?
-keyword_interact?
-locked_sign?

encoding.lua

@@ -0,0 +1,265 @@
+-- encoding borrowed from signs_lib fork at https://github.com/lord-server/lord
+
+local ansi_decode = {
+	[128] = "\208\130",
+	[129] = "\208\131",
+	[130] = "\226\128\154",
+	[131] = "\209\147",
+	[132] = "\226\128\158",
+	[133] = "\226\128\166",
+	[134] = "\226\128\160",
+	[135] = "\226\128\161",
+	[136] = "\226\130\172",
+	[137] = "\226\128\176",
+	[138] = "\208\137",
+	[139] = "\226\128\185",
+	[140] = "\208\138",
+	[141] = "\208\140",
+	[142] = "\208\139",
+	[143] = "\208\143",
+	[144] = "\209\146",
+	[145] = "\226\128\152",
+	[146] = "\226\128\153",
+	[147] = "\226\128\156",
+	[148] = "\226\128\157",
+	[149] = "\226\128\162",
+	[150] = "\226\128\147",
+	[151] = "\226\128\148",
+	[152] = "\194\152",
+	[153] = "\226\132\162",
+	[154] = "\209\153",
+	[155] = "\226\128\186",
+	[156] = "\209\154",
+	[157] = "\209\156",
+	[158] = "\209\155",
+	[159] = "\209\159",
+	[160] = "\194\160",
+	[161] = "\209\142",
+	[162] = "\209\158",
+	[163] = "\208\136",
+	[164] = "\194\164",
+	[165] = "\210\144",
+	[166] = "\194\166",
+	[167] = "\194\167",
+	[168] = "\208\129",
+	[169] = "\194\169",
+	[170] = "\208\132",
+	[171] = "\194\171",
+	[172] = "\194\172",
+	[173] = "\194\173",
+	[174] = "\194\174",
+	[175] = "\208\135",
+	[176] = "\194\176",
+	[177] = "\194\177",
+	[178] = "\208\134",
+	[179] = "\209\150",
+	[180] = "\210\145",
+	[181] = "\194\181",
+	[182] = "\194\182",
+	[183] = "\194\183",
+	[184] = "\209\145",
+	[185] = "\226\132\150",
+	[186] = "\209\148",
+	[187] = "\194\187",
+	[188] = "\209\152",
+	[189] = "\208\133",
+	[190] = "\209\149",
+	[191] = "\209\151"
+}
+local utf8_decode = {
+	[128] = {
+		[147] = "\150",
+		[148] = "\151",
+		[152] = "\145",
+		[153] = "\146",
+		[154] = "\130",
+		[156] = "\147",
+		[157] = "\148",
+		[158] = "\132",
+		[160] = "\134",
+		[161] = "\135",
+		[162] = "\149",
+		[166] = "\133",
+		[176] = "\137",
+		[185] = "\139",
+		[186] = "\155"
+	},
+	[130] = {[172] = "\136"},
+	[132] = {[150] = "\185", [162] = "\153"},
+	[194] = {
+		[152] = "\152",
+		[160] = "\160",
+		[164] = "\164",
+		[166] = "\166",
+		[167] = "\167",
+		[169] = "\169",
+		[171] = "\171",
+		[172] = "\172",
+		[173] = "\173",
+		[174] = "\174",
+		[176] = "\176",
+		[177] = "\177",
+		[181] = "\181",
+		[182] = "\182",
+		[183] = "\183",
+		[187] = "\187"
+	},
+	[208] = {
+		[129] = "\168",
+		[130] = "\128",
+		[131] = "\129",
+		[132] = "\170",
+		[133] = "\189",
+		[134] = "\178",
+		[135] = "\175",
+		[136] = "\163",
+		[137] = "\138",
+		[138] = "\140",
+		[139] = "\142",
+		[140] = "\141",
+		[143] = "\143",
+		[144] = "\192",
+		[145] = "\193",
+		[146] = "\194",
+		[147] = "\195",
+		[148] = "\196",
+		[149] = "\197",
+		[150] = "\198",
+		[151] = "\199",
+		[152] = "\200",
+		[153] = "\201",
+		[154] = "\202",
+		[155] = "\203",
+		[156] = "\204",
+		[157] = "\205",
+		[158] = "\206",
+		[159] = "\207",
+		[160] = "\208",
+		[161] = "\209",
+		[162] = "\210",
+		[163] = "\211",
+		[164] = "\212",
+		[165] = "\213",
+		[166] = "\214",
+		[167] = "\215",
+		[168] = "\216",
+		[169] = "\217",
+		[170] = "\218",
+		[171] = "\219",
+		[172] = "\220",
+		[173] = "\221",
+		[174] = "\222",
+		[175] = "\223",
+		[176] = "\224",
+		[177] = "\225",
+		[178] = "\226",
+		[179] = "\227",
+		[180] = "\228",
+		[181] = "\229",
+		[182] = "\230",
+		[183] = "\231",
+		[184] = "\232",
+		[185] = "\233",
+		[186] = "\234",
+		[187] = "\235",
+		[188] = "\236",
+		[189] = "\237",
+		[190] = "\238",
+		[191] = "\239"
+	},
+	[209] = {
+		[128] = "\240",
+		[129] = "\241",
+		[130] = "\242",
+		[131] = "\243",
+		[132] = "\244",
+		[133] = "\245",
+		[134] = "\246",
+		[135] = "\247",
+		[136] = "\248",
+		[137] = "\249",
+		[138] = "\250",
+		[139] = "\251",
+		[140] = "\252",
+		[141] = "\253",
+		[142] = "\254",
+		[143] = "\255",
+		[144] = "\161",
+		[145] = "\184",
+		[146] = "\144",
+		[147] = "\131",
+		[148] = "\186",
+		[149] = "\190",
+		[150] = "\179",
+		[151] = "\191",
+		[152] = "\188",
+		[153] = "\154",
+		[154] = "\156",
+		[155] = "\158",
+		[156] = "\157",
+		[158] = "\162",
+		[159] = "\159"
+	},
+	[210] = {[144] = "\165", [145] = "\180"}
+}
+
+local nmdc = {
+	[36] = "$",
+	[124] = "|"
+}
+
+function AnsiToUtf8(s)
+	local r, b = ""
+	for i = 1, s and s:len() or 0 do
+		b = s:byte(i)
+		if b < 128 then
+			r = r .. string.char(b)
+		else
+			if b > 239 then
+				r = r .. "\209" .. string.char(b - 112)
+			elseif b > 191 then
+				r = r .. "\208" .. string.char(b - 48)
+			elseif ansi_decode[b] then
+				r = r .. ansi_decode[b]
+			else
+				r = r .. "_"
+			end
+		end
+	end
+	return r
+end
+
+function Utf8ToAnsi(s)
+	local a, j, r, b = 0, 0, ""
+	for i = 1, s and s:len() or 0 do
+		b = s:byte(i)
+		if b < 128 then
+			if nmdc[b] then
+				r = r .. nmdc[b]
+			else
+				r = r .. string.char(b)
+			end
+		elseif a == 2 then
+			a, j = a - 1, b
+		elseif a == 1 then
+			--if j == nil or b == nil then return r end
+			--print(j)
+			--print(b)
+			--local ansi = utf8_decode[j]
+			--if ansi == nil then return r end
+			--if ansi[b] == nil then return r end
+			if utf8_decode[j] then
+				if utf8_decode[j][b] then
+					a, r = a - 1, r .. utf8_decode[j][b]
+				end
+			end
+		elseif b == 226 then
+			a = 2
+		elseif b == 194 or b == 208 or b == 209 or b == 210 then
+			j, a = b, 1
+		else
+			r = r .. "_"
+		end
+	end
+	return r
+end