added a proper register-sign API call

(see api.lua and standard_signs.lua for examples)

make selectionbox call now ignores the old onpole flag (it's automatic now)
removed debug print()'s
moved the signs-on-fences lbm settings to here, from basic_signs.
some misc cleanups

added reference models for standard wooden sign ("wallmounted" on wall,
"facedir" on wall, and pole-mount variants, using standard-size pole
mount), and a separate .blend with street_signs' OM3 sign on slim pole
mount.

api.lua

@@ -0,0 +1,902 @@
+-- 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.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 = {}
+
+signs_lib.wallmounted_rotate = function(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 })
+	for _, v in ipairs(minetest.get_objects_inside_radius(pos, 0.5)) do
+		local e = v:get_luaentity()
+		if e and e.name == "signs_lib:text" then
+			v:remove()
+		end
+	end
+	signs_lib.update_sign(pos)
+	return true
+end
+
+signs_lib.facedir_rotate = function(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 })
+	for _, v in ipairs(minetest.get_objects_inside_radius(pos, 0.5)) do
+		local e = v:get_luaentity()
+		if e and e.name == "signs_lib:text" then
+			v:remove()
+		end
+	end
+	signs_lib.update_sign(pos)
+	return true
+end
+
+local DEFAULT_TEXT_SCALE = {x=10, y=10}
+
+-- 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 function 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
+
+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]
+
+	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
+
+local function set_obj_text(obj, text, x, pos)
+	local split = split_lines_and_words
+	local text_ansi = Utf8ToAnsi(text)
+	local n = minetest.registered_nodes[minetest.get_node(pos).name]
+	local text_scale = (n and n.text_scale) or DEFAULT_TEXT_SCALE
+	local texture = make_sign_texture(split(text_ansi), pos)
+	obj:set_properties({
+		textures={texture},
+		visual_size = text_scale,
+	})
+end
+
+signs_lib.construct_sign = function(pos)
+	local meta = minetest.get_meta(pos)
+	meta:set_string(
+		"formspec",
+		"size[6,4]"..
+		"textarea[0,-0.3;6.5,3;text;;${text}]"..
+		"button_exit[2,3.4;2,1;ok;"..S("Write").."]"..
+		"background[-0.5,-0.5;7,5;signs_lib_sign_bg.jpg]")
+	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)
+	local objects = minetest.get_objects_inside_radius(pos, 0.5)
+	for _, v in ipairs(objects) do
+		local e = v:get_luaentity()
+		if e and e.name == "signs_lib:text" then
+			v:remove()
+		end
+	end
+end
+
+local function make_infotext(text)
+	text = trim_input(text)
+	local lines = 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")
+	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).." ")
+
+	local objects = minetest.get_objects_inside_radius(pos, 0.5)
+	local found
+	for _, v in ipairs(objects) do
+		local e = v:get_luaentity()
+		if e and e.name == "signs_lib:text" then
+			if found then
+				v:remove()
+			else
+				set_obj_text(v, text, nil, pos)
+				found = true
+			end
+		end
+	end
+	if found then
+		return
+	end
+
+	-- if there is no entity
+	local signnode = minetest.get_node(pos)
+	local signname = signnode.name
+	local def = minetest.registered_items[signname]
+	if not def.entity_info or not def.entity_info.yaw[signnode.param2 + 1] then return end
+	local obj = minetest.add_entity(pos, "signs_lib:text")
+
+	obj:setyaw(def.entity_info.yaw[signnode.param2 + 1])
+	obj:set_properties({
+		mesh = def.entity_info.mesh,
+	})
+end
+
+function signs_lib.receive_fields(pos, formname, fields, sender)
+	if fields and fields.text and fields.ok and signs_lib.can_modify(pos, sender) 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)
+	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
+
+local signs_text_on_activate = function(self)
+	local pos = self.object:getpos()
+	local meta = minetest.get_meta(pos)
+	local signnode = minetest.get_node(pos)
+	local signname = signnode.name
+	local def = minetest.registered_items[signname]
+	local text = meta:get_string("text")
+	if text and def and def.entity_info then
+		text = trim_input(text)
+		set_obj_text(self.object, text, nil, pos)
+		self.object:set_properties({
+			mesh = def.entity_info.mesh,
+		})
+	end
+end
+
+minetest.register_entity("signs_lib:text", {
+	collisionbox = { 0, 0, 0, 0, 0, 0 },
+	visual = "mesh",
+	mesh = "signs_lib_standard_wall_sign_entity.obj",
+	textures = {},
+	on_activate = signs_text_on_activate,
+})
+
+-- 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 (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.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})
+	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
+
+--[[
+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)
+
+	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
+
+	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
+		else
+			def.after_place_node = rdef.after_place_node or signs_lib.after_place_node
+		end
+	end
+
+	def.paramtype           = rdef.paramtype           or "light"
+	def.paramtype2          = rdef.paramtype2          or "wallmounted"
+	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
+
+	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
+
+		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
+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]
+
+			for _, v in ipairs(minetest.get_objects_inside_radius(pos, 0.5)) do
+				local e = v:get_luaentity()
+				if e and e.name == "signs_lib:text" then
+					v:remove()
+				end
+			end
+
+			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
+				local objects = minetest.get_objects_inside_radius(pos, 0.5)
+				if #objects > 0 then
+					for _, v in ipairs(objects) do
+						v:remove()
+					end
+				end
+				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
+})

depends.txt

@@ -1,6 +1,3 @@
 default
-basic_materials
 intllib?
 screwdriver?
-keyword_interact?
-craft_guide?

encoding.lua

@@ -1,4 +1,4 @@
--- encoding borrowed from signs_lib mod of https://github.com/lord-server/lord
+-- encoding borrowed from signs_lib fork at https://github.com/lord-server/lord
 
 local ansi_decode = {
 	[128] = "\208\130",

models/signs_lib_standard_wall_sign.obj

@@ -0,0 +1,52 @@
+# Blender v2.79 (sub 0) OBJ File: 'basic_signs wooden wall sign.blend'
+# www.blender.org
+o Cube
+v 0.437500 -0.500000 -0.312500
+v 0.437500 -0.437500 -0.312500
+v 0.437500 -0.500000 0.312500
+v 0.437500 -0.437500 0.312500
+v -0.437500 -0.500000 -0.312500
+v -0.437500 -0.437500 -0.312500
+v -0.437500 -0.500000 0.312500
+v -0.437500 -0.437500 0.312500
+v 0.437500 -0.500000 -0.312500
+v 0.437500 -0.437500 -0.312500
+v 0.437500 -0.500000 0.312500
+v 0.437500 -0.437500 0.312500
+v -0.437500 -0.500000 -0.312500
+v -0.437500 -0.437500 -0.312500
+v -0.437500 -0.500000 0.312500
+v -0.437500 -0.437500 0.312500
+vt 0.468750 0.812500
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+vt 0.531250 0.187500
+vt 0.234375 0.000000
+vt 0.234375 1.000000
+vt 0.015625 1.000000
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+vt 0.390625 1.000000
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+vn 0.0000 1.0000 0.0000
+vn 0.0000 -1.0000 0.0000
+vn 0.0000 0.0000 -1.0000
+vn 0.0000 0.0000 1.0000
+vn 1.0000 0.0000 0.0000
+vn -1.0000 0.0000 0.0000
+g Cube_Cube_front-back
+s off
+f 8/1/1 4/2/1 2/3/1 6/4/1
+f 3/5/2 7/6/2 5/7/2 1/8/2
+g Cube_Cube_edges
+f 13/9/3 14/10/3 10/11/3 9/12/3
+f 11/13/4 12/14/4 16/15/4 15/16/4
+f 11/13/5 9/17/5 10/18/5 12/14/5
+f 13/9/6 15/16/6 16/15/6 14/10/6

models/signs_lib_standard_wall_sign_entity.obj

@@ -0,0 +1,15 @@
+# Blender v2.79 (sub 0) OBJ File: 'basic_signs wooden sign.blend'
+# www.blender.org
+o text_entity_Plane
+v 0.406250 -0.281250 0.425781
+v -0.406250 -0.281250 0.425781
+v 0.406250 0.281250 0.425781
+v -0.406250 0.281250 0.425781
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vn 0.0000 -0.0000 -1.0000
+g text_entity_Plane_text_entity
+s off
+f 1/1/1 2/2/1 4/3/1 3/4/1

models/signs_lib_standard_wall_sign_entity_onpole.obj

@@ -0,0 +1,15 @@
+# Blender v2.79 (sub 0) OBJ File: 'basic_signs wooden sign.blend'
+# www.blender.org
+o text_entity.001_Plane
+v 0.406250 -0.281250 0.738281
+v -0.406250 -0.281250 0.738281
+v 0.406250 0.281250 0.738281
+v -0.406250 0.281250 0.738281
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vn 0.0000 -0.0000 -1.0000
+g text_entity.001_Plane_text_entity
+s off
+f 1/1/1 2/2/1 4/3/1 3/4/1

models/signs_lib_standard_wall_sign_facedir.obj

@@ -0,0 +1,52 @@
+# Blender v2.79 (sub 0) OBJ File: 'basic_signs wooden sign.blend'
+# www.blender.org
+o sign_(3)_Cube
+v 0.437500 -0.312500 0.500000
+v 0.437500 -0.312500 0.437500
+v 0.437500 0.312500 0.500000
+v 0.437500 0.312500 0.437500
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+v -0.437500 -0.312500 0.437500
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+v 0.437500 0.312500 0.437500
+v -0.437500 -0.312500 0.500000
+v -0.437500 -0.312500 0.437500
+v -0.437500 0.312500 0.500000
+v -0.437500 0.312500 0.437500
+vt 0.468750 0.812500
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+vt 0.390625 1.000000
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+vn 0.0000 0.0000 -1.0000
+vn 0.0000 -0.0000 1.0000
+vn 0.0000 -1.0000 0.0000
+vn 0.0000 1.0000 0.0000
+vn 1.0000 0.0000 0.0000
+vn -1.0000 0.0000 0.0000
+g sign_(3)_Cube_front-back
+s off
+f 8/1/1 4/2/1 2/3/1 6/4/1
+f 3/5/2 7/6/2 5/7/2 1/8/2
+g sign_(3)_Cube_edges
+f 13/9/3 14/10/3 10/11/3 9/12/3
+f 11/13/4 12/14/4 16/15/4 15/16/4
+f 11/13/5 9/17/5 10/18/5 12/14/5
+f 13/9/6 15/16/6 16/15/6 14/10/6

models/signs_lib_standard_wall_sign_facedir_onpole.obj

@@ -0,0 +1,246 @@
+# Blender v2.79 (sub 0) OBJ File: 'basic_signs wooden sign.blend'
+# www.blender.org
+o sign_on_pole.001_Cube.002
+v 0.437500 -0.312500 0.812500
+v 0.437500 -0.312500 0.750000
+v 0.437500 0.312500 0.812500
+v 0.437500 0.312500 0.750000
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+v -0.437500 -0.312500 0.750000
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+v 0.437500 0.312500 0.750000
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+v -0.125000 -0.187500 0.812500
+v -0.125000 -0.187500 0.875000
+v -0.125000 0.187500 0.812500
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+v 0.125000 0.187500 0.812500
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+v 0.125000 -0.187500 0.875000
+v 0.125000 0.187500 0.875000
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+v -0.164063 0.187500 1.125000
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+vt 0.468750 0.812500
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+vt 0.531250 0.812500
+vt 0.968750 0.812500
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+vt 0.234375 0.000000
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models/signs_lib_standard_wall_sign_onpole.obj

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standard_signs.lua

@@ -0,0 +1,30 @@
+-- Definitions for standard minetest_game wooden and steel wall signs
+
+signs_lib.register_sign("default:sign_wall_wood", {
+	description = "Wooden wall sign",
+	inventory_image = "signs_lib_sign_wall_wooden_inv.png",
+	tiles = {
+		"signs_lib_sign_wall_wooden.png",
+		"signs_lib_sign_wall_wooden_edges.png",
+	},
+	entity_info = "standard"
+})
+
+signs_lib.register_sign("default:sign_wall_steel", {
+	description = "Steel wall sign",
+	inventory_image = "signs_lib_sign_wall_steel_inv.png",
+	tiles = {
+		"signs_lib_sign_wall_steel.png",
+		"signs_lib_sign_wall_steel_edges.png",
+	},
+	groups = signs_lib.standard_steel_groups,
+	sounds = signs_lib.standard_steel_sign_sounds,
+	locked = true,
+	entity_info = "standard"
+})
+
+-- insert the old wood sign-on-fencepost into signs_lib's conversion LBM
+
+table.insert(signs_lib.old_fenceposts_with_signs, "signs:sign_post")
+signs_lib.old_fenceposts["signs:sign_post"] = "default:fence_wood"
+signs_lib.old_fenceposts_replacement_signs["signs:sign_post"] = "default:sign_wall_wood_onpole"