fix 'dummy' formspec images (the hacky way)

Any sign can now use a 15 or 31 px font, at any reasonable visual scale,
line width, number of lines, etc.

Split most signs off into a separate mod, basic_signs, which depends on
this one.  Only the default minetest_game wood and steel signs remain in
signs_lib, completely redefined. The wall/yard/ceiling function for
wooden signs has been rewitten and moved to basic_signs, too.

signs_lib can now put almost any wall sign onto almost any kind of
posts/fence, as with most signs in my street_signs mod.  Mods can add
their fences/posts to its "allowed" list, if needed (signs_lib tries to
detect most kinds of suitable fences, poles, posts, etc).

All signs affected by these changes are similar to what they've always
been, for continuity.  The main difference is that they all use a 15px
font now, with a slightly larger scale, and the positions of some have
changed slightly.

Dropped the old "@KEYWORD" feature (but it could be re-added if it turns
out to be needed), and most of the old cruft like "|" for line breaks.

Created new wood and steel sign textures, derived from HDX.

See standard_signs.lua for examples of how the new API is used. The
"standard" text sizing/position/etc. variables are all at the top of
api.lua.

api.lua

@@ -0,0 +1,696 @@
+-- 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 = 2
+signs_lib.standard_cpl = 35
+
+signs_lib.standard_wood_groups =  {choppy = 2, flammable = 2, oddly_breakable_by_hand = 3}
+signs_lib.standard_steel_groups = {cracky = 2, oddly_breakable_by_hand = 3} 
+
+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, onpole, xoffs, yoffs, zoffs, fdir)
+
+	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 onpole == "_onpole" then
+		if not fdir then
+			return {
+				type = "wallmounted",
+				wall_side =   { -0.5 - 0.3125 + zo, -ty + yo, -tx + xo, -0.4375 - 0.3125 + zo, ty + yo , tx + xo },
+				wall_top =    {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5 },
+				wall_bottom = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5 },
+			}
+		else
+			return {
+				type = "fixed",
+				fixed = { -tx + xo, -ty + yo, 0.5 + 0.3125 + zo, tx + xo, ty + yo, 0.4375 + 0.3125 + zo }
+			}
+		end
+	else
+		if not fdir 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
+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]
+
+	print(dump(pos))
+	print(dump(ppos))
+
+	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
+		print("signs_lib.check_for_pole returned true")
+		return true
+	end
+end
+
+function signs_lib.after_place_node(pos, placer, itemstack, pointed_thing, locked)
+	local ppos = minetest.get_pointed_thing_position(pointed_thing)
+	local pnode = minetest.get_node(ppos)
+	local pdef = minetest.registered_items[pnode.name]
+	local playername = placer:get_player_name()
+
+	if 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
+
+-- 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
+})

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
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+vn 0.0000 0.0000 1.0000
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+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
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+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 0.429688
+v -0.406250 -0.281250 0.429688
+v 0.406250 0.281250 0.429688
+v -0.406250 0.281250 0.429688
+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 0.742188
+v -0.406250 -0.281250 0.742188
+v 0.406250 0.281250 0.742188
+v -0.406250 0.281250 0.742188
+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 wall sign.blend'
+# www.blender.org
+o Cube.008_Cube
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+vn -1.0000 0.0000 0.0000
+g Cube.008_Cube_front-back
+s off
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+f 3/5/2 7/6/2 5/7/2 1/8/2
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+f 13/9/6 15/16/6 16/15/6 14/10/6

models/signs_lib_standard_wall_sign_facedir_onpole.obj

@@ -0,0 +1,254 @@
+# Blender v2.79 (sub 0) OBJ File: 'basic_signs wooden wall sign.blend'
+# www.blender.org
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models/signs_lib_standard_wall_sign_onpole.obj

@@ -0,0 +1,254 @@
+# Blender v2.79 (sub 0) OBJ File: 'basic_signs wooden wall sign.blend'
+# www.blender.org
+o Cube.003_Cube
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+s off
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standard_signs.lua

@@ -0,0 +1,105 @@
+-- Definitions for standard minetest_game wooden and steel wall signs
+
+for _, onpole in ipairs({"", "_onpole"}) do
+
+	local nci = nil
+	local on_rotate = signs_lib.wallmounted_rotate
+	local pole_mount_tex = nil
+
+	if onpole == "_onpole" then
+		nci = 1
+		on_rotate = nil
+		pole_mount_tex = "signs_lib_pole_mount.png" -- the metal straps on back, if needed
+	end
+
+	local wood_groups =  table.copy(signs_lib.standard_wood_groups)
+	wood_groups.not_in_creative_inventory = nci
+	local steel_groups =  table.copy(signs_lib.standard_steel_groups)
+	steel_groups.not_in_creative_inventory = nci
+
+	cbox = signs_lib.make_selection_boxes(35, 25, onpole)
+
+	minetest.register_node(":default:sign_wall_wood"..onpole, {
+		description = "Wooden wall sign",
+		paramtype = "light",
+		sunlight_propagates = true,
+		paramtype2 = "wallmounted",
+		drawtype = "mesh",
+		node_box = cbox,
+		selection_box = cbox,
+		mesh = "signs_lib_standard_wall_sign"..onpole..".obj",
+		tiles = {
+			"signs_lib_sign_wall_wooden.png",
+			"signs_lib_sign_wall_wooden_edges.png",
+			pole_mount_tex
+		},
+		inventory_image = "signs_lib_sign_wall_wooden_inv.png",
+		wield_image = "signs_lib_sign_wall_wooden_inv.png",
+		groups = wood_groups,
+		default_color = "0",
+		on_rightclick = signs_lib.construct_sign,
+		on_construct = signs_lib.construct_sign,
+		on_destruct = signs_lib.destruct_sign,
+		on_receive_fields = signs_lib.receive_fields,
+		on_punch = signs_lib.update_sign,
+		on_rotate = signs_lib.wallmounted_rotate,
+		number_of_lines = signs_lib.standard_lines,
+		horiz_scaling = signs_lib.standard_hscale,
+		vert_scaling = signs_lib.standard_vscale,
+		line_spacing = signs_lib.standard_lspace,
+		font_size = signs_lib.standard_fsize,
+		x_offset = signs_lib.standard_xoffs,
+		y_offset = signs_lib.standard_yoffs,
+		chars_per_line = signs_lib.standard_cpl,
+		entity_info = {
+			mesh = "signs_lib_standard_wall_sign_entity"..onpole..".obj",
+			yaw = signs_lib.wallmounted_yaw
+		},
+		drop = "default:sign_wall_wood"
+	})
+	table.insert(signs_lib.lbm_restore_nodes, "default:sign_wall_wood"..onpole)
+
+	minetest.register_node(":default:sign_wall_steel"..onpole, {
+		description = "Steel wall sign",
+		paramtype = "light",
+		sunlight_propagates = true,
+		paramtype2 = "wallmounted",
+		drawtype = "mesh",
+		node_box = cbox,
+		selection_box = cbox,
+		mesh = "signs_lib_standard_wall_sign"..onpole..".obj",
+		tiles = {
+			"signs_lib_sign_wall_steel.png",
+			"signs_lib_sign_wall_steel_edges.png",
+			pole_mount_tex
+		},
+		inventory_image = "signs_lib_sign_wall_steel_inv.png",
+		wield_image = "signs_lib_sign_wall_steel_inv.png",
+		groups = wood_groups,
+		default_color = "0",
+		on_rightclick = signs_lib.construct_sign,
+		on_construct = signs_lib.construct_sign,
+		on_destruct = signs_lib.destruct_sign,
+		after_place_node = function(pos, placer, itemstack, pointed_thing)
+			signs_lib.after_place_node(pos, placer, itemstack, pointed_thing, true)
+		end,
+		on_receive_fields = signs_lib.receive_fields,
+		on_punch = signs_lib.update_sign,
+		can_dig = signs_lib.can_modify,
+		on_rotate = signs_lib.wallmounted_rotate,
+		number_of_lines = signs_lib.standard_lines,
+		horiz_scaling = signs_lib.standard_hscale,
+		vert_scaling = signs_lib.standard_vscale,
+		line_spacing = signs_lib.standard_lspace,
+		font_size = signs_lib.standard_fsize,
+		x_offset = signs_lib.standard_xoffs,
+		y_offset = signs_lib.standard_yoffs,
+		chars_per_line = signs_lib.standard_cpl,
+		entity_info = {
+			mesh = "signs_lib_standard_wall_sign_entity"..onpole..".obj",
+			yaw = signs_lib.wallmounted_yaw
+		},
+		drop = "default:sign_wall_steel"
+	})
+	table.insert(signs_lib.lbm_restore_nodes, "default:sign_wall_steel"..onpole)
+end