Fix more accidental globals

[minetest_hades/hades_revisited.git] / mods / signs_lib / init.lua

-- This mod provides the visible text on signs library used by Home Decor
-- and perhaps other mods at some point in the future.  Forked from thexyz's/
-- PilzAdam's original text-on-signs mod and rewritten by Vanessa Ezekowitz
-- and Diego Martinez

-- textpos = {
--              { delta = {entity position for 0° yaw}, exact yaw expression }
--              { delta = {entity position for 180° yaw}, exact yaw expression }
--              { delta = {entity position for 270° yaw}, exact yaw expression }
--              { delta = {entity position for 90° yaw}, exact yaw expression }
-- }

signs_lib = {}

signs_lib.modpath = minetest.get_modpath("signs_lib")

signs_lib.wall_sign_model = {
        nodebox = {
                type = "fixed",
                fixed = {-0.4375, -0.25, 0.4375, 0.4375, 0.375, 0.5}
        },
        textpos = {
                {delta = {x =  0,     y = 0.07, z =  0.43  }, yaw = 0},
                {delta = {x =  0.43,  y = 0.07, z =  0     }, yaw = math.pi / -2},
                {delta = {x =  0,     y = 0.07, z = -0.43  }, yaw = math.pi},
                {delta = {x = -0.43,  y = 0.07, z =  0     }, yaw = math.pi / 2},
        }
}

signs_lib.yard_sign_model = {
        nodebox = {
                type = "fixed",
                fixed = {
                                {-0.4375, -0.25, -0.0625, 0.4375, 0.375, 0},
                                {-0.0625, -0.5, -0.0625, 0.0625, -0.1875, 0},
                }
        },
        textpos = {
                {delta = {x =  0,      y = 0.07, z = -0.068}, yaw = 0},
                {delta = {x = -0.068,  y = 0.07, z =  0    }, yaw = math.pi / -2},
                {delta = {x =  0,      y = 0.07, z =  0.068}, yaw = math.pi},
                {delta = {x =  0.068,  y = 0.07, z =  0    }, yaw = math.pi / 2},
        }
}

signs_lib.hanging_sign_model = {
        nodebox = {
                type = "fixed",
                fixed = {
                                {-0.4375, -0.3125, -0.0625, 0.4375, 0.3125, 0},
                                {-0.4375, 0.25, -0.03125, 0.4375, 0.5, -0.03125},
                }
        },
        textpos = {
                {delta = {x =  0,      y = -0.02, z = -0.063}, yaw = 0},
                {delta = {x = -0.063,  y = -0.02, z =  0    }, yaw = math.pi / -2},
                {delta = {x =  0,      y = -0.02, z =  0.063}, yaw = math.pi},
                {delta = {x =  0.063,  y = -0.02, z =  0    }, yaw = math.pi / 2},
        }
}

signs_lib.sign_post_model = {
        nodebox = {
                type = "fixed",
                fixed = {
                                {-0.4375, -0.25, -0.1875, 0.4375, 0.375, -0.125},
                                {-0.125, -0.5, -0.125, 0.125, 0.5, 0.125},
                }
        },
        textpos = {
                {delta = {x = 0,      y = 0.07, z = -0.188}, yaw = 0},
                {delta = {x = -0.188, y = 0.07, z = 0     }, yaw = math.pi / -2},
                {delta = {x = 0,      y = 0.07, z = 0.188 }, yaw = math.pi},
                {delta = {x = 0.188,  y = 0.07, z = 0     }, yaw = math.pi / 2},
        }
}

local S = minetest.get_translator("signs_lib")

-- the list of standard sign nodes

signs_lib.sign_node_list = {
                "signs_lib:sign_wall",
                "signs_lib:sign_yard",
                "signs_lib:sign_hanging",
                "signs_lib:sign_wall_green",
                "signs_lib:sign_wall_yellow",
                "signs_lib:sign_wall_red",
                "signs_lib:sign_wall_white_red",
                "signs_lib:sign_wall_white_black",
                "signs_lib:sign_wall_locked"
}

--table copy

function signs_lib.table_copy(t)
    local nt = { };
    for k, v in pairs(t) do
        if type(v) == "table" then
            nt[k] = signs_lib.table_copy(v)
        else
            nt[k] = v
        end
    end
    return nt
end

-- infinite stacks

if minetest.get_modpath("unified_inventory") or not minetest.settings:get_bool("creative_mode") then
        signs_lib.expect_infinite_stacks = false
else
        signs_lib.expect_infinite_stacks = true
end

-- CONSTANTS

local MP = minetest.get_modpath("signs_lib")

-- Used by `build_char_db' to locate the file.
local FONT_FMT = "%s/hdf_%02x.png"

-- Simple texture name for building text texture.
local FONT_FMT_SIMPLE = "hdf_%02x.png"

-- Path to the textures.
local TP = MP.."/textures"

local TEXT_SCALE = {x=0.8, y=0.5}

-- Lots of overkill here. KISS advocates, go away, shoo! ;) -- kaeza

local PNG_HDR = string.char(0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A)

-- Read the image size from a PNG file.
-- Returns image_w, image_h.
-- Only the LSB is read from each field!
local function read_char_size(c)
        local filename = FONT_FMT:format(TP, c)
        local f = io.open(filename, "rb")
        f:seek("set", 0x0)
        local hdr = f:read(8)
        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

-- Set by build_char_db()
local LINE_HEIGHT
local SIGN_WIDTH

-- Size of the canvas, in characters.
-- Please note that CHARS_PER_LINE is multiplied by the average character
-- width to get the total width of the canvas, so for proportional fonts,
-- either more or fewer characters may fit on a line.
local CHARS_PER_LINE = 30
local NUMBER_OF_LINES = 6

-- 6 rows, max 80 chars per, plus a bit of fudge to
-- avoid excess trimming (e.g. due to color codes)

local MAX_INPUT_CHARS = 600

-- This holds the individual character widths.
-- Indexed by the actual character (e.g. charwidth["A"])
local charwidth = { }

-- File to cache the font size to.
local CHARDB_FILE = minetest.get_worldpath().."/signs_lib_chardb"

-- 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

-- Returns true if any file differs from cached one.
local function check_random_chars()
        for i = 1, 5 do
                local c = math.random(32, 126)
                local w, h = read_char_size(c)

                -- File is not a PNG... wut?
                if not (w and h) then return true end

                local ch = string.char(c)
                if  (not charwidth[ch])                     -- Char is not cached.
                 or (charwidth[ch] ~= w)                    -- Width differs.
                 or (LINE_HEIGHT and (LINE_HEIGHT ~= h))    -- Height differs
                 then
                        -- In any case, file is different; rebuild cache.
                        return true
                end
        end
        -- OK, our superficial check passed. If the textures are messed up,
        -- it's not our problem.
        return false
end

local function build_char_db()

        LINE_HEIGHT = nil
        SIGN_WIDTH = nil

        -- To calculate average char width.
        local total_width = 0
        local char_count = 0

        -- Try to load cached data to avoid heavy disk I/O.

        local cdbf = io.open(CHARDB_FILE, "rt")

        if cdbf then
                minetest.log("info", "[signs_lib] Reading cached character database.")
                for line in cdbf:lines() do
                        local ch, w = line:match("(0x[0-9A-Fa-f]+)%s+([0-9][0-9]*)")
                        if ch and w then
                                local c = tonumber(ch)
                                w = tonumber(w)
                                if c and w then
                                        if c == 0 then
                                                LINE_HEIGHT = w
                                        elseif (c >= 32) and (c < 127) then
                                                charwidth[string.char(c)] = w
                                                total_width = total_width + w
                                                char_count = char_count + 1
                                        end
                                end
                        end
                end
                cdbf:close()
                if LINE_HEIGHT then
                        -- Check some random characters to see if the file on disk differs
                        -- from the cached one. If so, then ditch cached data and rebuild
                        -- (font probably was changed).
                        if check_random_chars() then
                                LINE_HEIGHT = nil
                                minetest.log("info", "[signs_lib] "
                                        .."Font seems to have changed. Rebuilding cache."
                                )
                        end
                else
                        minetest.log("warning", "[signs_lib] "
                                .."Could not find font line height in cached DB. Trying brute force."
                        )
                end
        end

        if not LINE_HEIGHT then
                -- OK, something went wrong... try brute force loading from texture files.

                charwidth = { }

                total_width = 0
                char_count = 0

                for c = 32, 126 do
                        local w, h = read_char_size(c)
                        if w and h then
                                local ch = string.char(c)
                                charwidth[ch] = w
                                total_width = total_width + w
                                char_count = char_count + 1
                                if not LINE_HEIGHT then LINE_HEIGHT = h end
                        end
                end

                if not LINE_HEIGHT then
                        error("Could not find font line height.")
                end

        end

        -- XXX: Is there a better way to calc this?
        SIGN_WIDTH = math.floor((total_width / char_count) * CHARS_PER_LINE)

        -- Try to save cached list back to disk.

        local e -- Note: `cdbf' is already declared local above.
        cdbf, e = io.open(CHARDB_FILE, "wt")
        if not cdbf then
                minetest.log("warning", "[signs_lib] Could not save cached char DB: "..(e or ""))
                return
        end

        cdbf:write(("0x00 %d\n"):format(LINE_HEIGHT))
        for c = 32, 126 do
                local w = charwidth[string.char(c)]
                if w then
                        cdbf:write(("0x%02X %d\n"):format(c, w))
                end
        end
        cdbf:close()

end

local sign_groups = {sign=1, choppy=2, dig_immediate=2}
local sign_wall_groups = {sign=1, sign_wall=1, choppy=2, dig_immediate=2}

local fences_with_sign = { }

-- some local helper functions

local function split_lines_and_words_old(text)
        local lines = { }
        local line = { }
        if not text then return end
        for word in text:gmatch("%S+") do
                if word == "|" then
                        table.insert(lines, line)
                        if #lines >= NUMBER_OF_LINES then break end
                        line = { }
                elseif word == "\\|" then
                        table.insert(line, "|")
                else
                        table.insert(line, word)
                end
        end
        table.insert(lines, line)
        return lines
end

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)
        c = c or "0"
        local tex = { }
        for xx = 0, math.max(0, w-16), 16 do
                table.insert(tex, (":%d,%d=slc_%s.png"):format(x + xx, y, c))
        end
        if ((w % 16) > 0) and (w > 16) then
                table.insert(tex, (":%d,%d=slc_%s.png"):format(x + w - 16, y, c))
        end
        return table.concat(tex)
end

local function make_line_texture(line, lineno)

        local width = 0
        local maxw = 0

        local words = { }

        local cur_color = 0

        -- We check which chars are available here.
        for word_i, word in ipairs(line) do
                local chars = { }
                local ch_offs = 0
                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 = charwidth[c]
                                if w then
                                        width = width + w + 1
                                        if width >= (SIGN_WIDTH - charwidth[" "]) then
                                                width = 0
                                        else
                                                maxw = math_max(width, maxw)
                                        end
                                        if #chars < MAX_INPUT_CHARS then
                                                table.insert(chars, {
                                                        off=ch_offs,
                                                        tex=FONT_FMT_SIMPLE:format(c:byte()),
                                                        col=("%X"):format(cur_color),
                                                })
                                        end
                                        ch_offs = ch_offs + w
                                end
                        end
                        i = i + 1
                end
                width = width + charwidth[" "] + 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((SIGN_WIDTH - maxw) / 2)

        local xpos = start_xpos
        local ypos = (LINE_HEIGHT * lineno)

        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"))
                        xpos = start_xpos
                        ypos = ypos + LINE_HEIGHT
                        lineno = lineno + 1
                        if lineno >= NUMBER_OF_LINES then break end
                        table.insert(texture, fill_line(xpos, ypos, maxw, cur_color))
                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))
                        end
                        table.insert(texture, (":%d,%d=%s"):format(xpos + ch.off, ypos, ch.tex))
                end
                table.insert(texture, (":%d,%d=hdf_20.png"):format(xpos + word.w, ypos))
                xpos = xpos + word.w + charwidth[" "]
                if xpos >= (SIGN_WIDTH + charwidth[" "]) then break end
        end

        table.insert(texture, fill_line(xpos, ypos, maxw, "n"))
        table.insert(texture, fill_line(start_xpos, ypos + LINE_HEIGHT, maxw, "n"))

        return table.concat(texture), lineno
end

local function make_sign_texture(lines)
        local texture = { ("[combine:%dx%d"):format(SIGN_WIDTH, LINE_HEIGHT * NUMBER_OF_LINES) }
        local lineno = 0
        for i = 1, #lines do
                if lineno >= NUMBER_OF_LINES then break end
                local linetex, ln = make_line_texture(lines[i], lineno)
                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, new)
        local split = new and split_lines_and_words or split_lines_and_words_old
        obj:set_properties({
                textures={make_sign_texture(split(text))},
                visual_size = TEXT_SCALE,
        })
end

signs_lib.construct_sign = function(pos, locked)
    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;Write]"..
                "background[-0.5,-0.5;7,5;bg_signs_lib.jpg]")
        meta:set_string("infotext", "")
end

signs_lib.destruct_sign = function(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

signs_lib.update_sign = function(pos, fields, owner)
    local meta = minetest.get_meta(pos)

    local new
        if fields then

                fields.text = trim_input(fields.text)

                local ownstr = ""
                if owner then ownstr = "Locked sign, owned by "..owner.."\n" end

                meta:set_string("infotext", ownstr..make_infotext(fields.text).." ")
                meta:set_string("text", fields.text)
                meta:set_int("__signslib_new_format", 1)
                new = true
        else
                new = (meta:get_int("__signslib_new_format") ~= 0)
        end
    local text = meta:get_string("text")
    if text == nil then return end
    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, new)
                                found = true
                        end
        end
    end
    if found then
                return
    end

        -- if there is no entity
        local sign_info
        local signnode = minetest.get_node(pos)
        if signnode.name == "signs_lib:sign_yard" then
                sign_info = signs_lib.yard_sign_model.textpos[minetest.get_node(pos).param2 + 1]
        elseif signnode.name == "signs_lib:sign_hanging" then
                sign_info = signs_lib.hanging_sign_model.textpos[minetest.get_node(pos).param2 + 1]
        elseif minetest.get_item_group(signnode.name, "sign_wall") == 1 then
                sign_info = signs_lib.wall_sign_model.textpos[minetest.get_node(pos).param2 + 1]
        else -- ...it must be a sign on a fence post.
                sign_info = signs_lib.sign_post_model.textpos[minetest.get_node(pos).param2 + 1]
        end
        if sign_info == nil then
                return
        end
        local text = minetest.add_entity({x = pos.x + sign_info.delta.x,
                                                                                y = pos.y + sign_info.delta.y,
                                                                                z = pos.z + sign_info.delta.z}, "signs_lib:text")
        text:set_yaw(sign_info.yaw)
end

-- What kind of sign do we need to place, anyway?

function signs_lib.determine_sign_type(itemstack, placer, pointed_thing, locked)
        local name
        name = minetest.get_node(pointed_thing.under).name
        if fences_with_sign[name] then
                if minetest.is_protected(pointed_thing.under, placer:get_player_name()) then
                        minetest.record_protection_violation(pointed_thing.under,
                                placer:get_player_name())
                        return itemstack
                end
        else
                name = minetest.get_node(pointed_thing.above).name
                local def = minetest.registered_nodes[name]
                if not def.buildable_to then
                        return itemstack
                end
                if minetest.is_protected(pointed_thing.above, placer:get_player_name()) then
                        minetest.record_protection_violation(pointed_thing.above,
                                placer:get_player_name())
                        return itemstack
                end
        end

        local node=minetest.get_node(pointed_thing.under)

        if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].on_rightclick then
                return minetest.registered_nodes[node.name].on_rightclick(pointed_thing.under, node, placer, itemstack)
        else
                local above = pointed_thing.above
                local under = pointed_thing.under
                local dir = {x = under.x - above.x,
                                         y = under.y - above.y,
                                         z = under.z - above.z}

                local wdir = minetest.dir_to_wallmounted(dir)

                local placer_pos = placer:get_pos()
                if placer_pos then
                        dir = {
                                x = above.x - placer_pos.x,
                                y = above.y - placer_pos.y,
                                z = above.z - placer_pos.z
                        }
                end

                local fdir = minetest.dir_to_facedir(dir)

                local pt_name = minetest.get_node(under).name
                local signname = itemstack:get_name()

                if fences_with_sign[pt_name] and signname == "signs_lib:sign_wall" then
                        minetest.add_node(under, {name = fences_with_sign[pt_name], param2 = fdir})
                elseif wdir == 0 and signname == "signs_lib:sign_wall" then
                        minetest.add_node(above, {name = "signs_lib:sign_hanging", param2 = fdir})
                elseif wdir == 1 and signname == "signs_lib:sign_wall" then
                        minetest.add_node(above, {name = "signs_lib:sign_yard", param2 = fdir})
                else -- it must be a wooden or metal wall sign.
                        minetest.add_node(above, {name = signname, param2 = fdir})
                        if locked then
                                local meta = minetest.get_meta(above)
                                local owner = placer:get_player_name()
                                meta:set_string("owner", owner)
                        end
                end

                if not signs_lib.expect_infinite_stacks then
                        itemstack:take_item()
                end
                return itemstack
        end
end

function signs_lib.receive_fields(pos, formname, fields, sender, lock)
        if minetest.is_protected(pos, sender:get_player_name()) then
                minetest.record_protection_violation(pos,
                        sender:get_player_name())
                return
        end
        local lockstr = lock and "locked " or ""
        if fields and fields.text and fields.ok then
                minetest.log("action", ("%s wrote \"%s\" to "..lockstr.."sign at %s"):format(
                        (sender:get_player_name() or ""),
                        fields.text,
                        minetest.pos_to_string(pos)
                ))
                if lock then
                        signs_lib.update_sign(pos, fields, sender:get_player_name())
                else
                        signs_lib.update_sign(pos, fields)
                end
        end
end

minetest.register_node("signs_lib:sign_wall", {
        description = S("Wooden Sign"),
        _tt_help = S("Write text on it"),
        inventory_image = "default_sign_wall.png",
        wield_image = "default_sign_wall.png",
        is_ground_content = false,
        node_placement_prediction = "",
        paramtype = "light",
        sunlight_propagates = true,
        paramtype2 = "facedir",
        drawtype = "nodebox",
        node_box = signs_lib.wall_sign_model.nodebox,
        tiles = {"signs_top.png", "signs_bottom.png", "signs_side.png", "signs_side.png", "signs_back.png", "signs_front.png"},
        groups = sign_wall_groups,

        on_place = function(itemstack, placer, pointed_thing)
                return signs_lib.determine_sign_type(itemstack, placer, pointed_thing)
        end,
        on_construct = function(pos)
                signs_lib.construct_sign(pos)
        end,
        on_destruct = function(pos)
                signs_lib.destruct_sign(pos)
        end,
        on_receive_fields = function(pos, formname, fields, sender)
                signs_lib.receive_fields(pos, formname, fields, sender)
        end,
        on_punch = function(pos, node, puncher)
                signs_lib.update_sign(pos)
        end,
        on_rotate = false,
    sounds = hades_sounds.node_sound_wood_defaults(),
})

minetest.register_node("signs_lib:sign_yard", {
    paramtype = "light",
        sunlight_propagates = true,
    is_ground_content = false,
    paramtype2 = "facedir",
    drawtype = "nodebox",
    node_box = signs_lib.yard_sign_model.nodebox,
        selection_box = {
                type = "fixed",
                fixed = {-0.4375, -0.5, -0.0625, 0.4375, 0.375, 0}
        },
    tiles = {"signs_top.png", "signs_bottom.png", "signs_side.png", "signs_side.png", "signs_back.png", "signs_front.png"},
    groups = sign_groups,
    drop = "signs_lib:sign_wall",

    on_construct = function(pos)
        signs_lib.construct_sign(pos)
    end,
    on_destruct = function(pos)
        signs_lib.destruct_sign(pos)
    end,
        on_receive_fields = function(pos, formname, fields, sender)
                signs_lib.receive_fields(pos, formname, fields, sender)
        end,
        on_punch = function(pos, node, puncher)
                signs_lib.update_sign(pos)
        end,
    on_rotate = false,
    sounds = hades_sounds.node_sound_wood_defaults(),
})

minetest.register_node("signs_lib:sign_hanging", {
    paramtype = "light",
        sunlight_propagates = true,
    is_ground_content = false,
    paramtype2 = "facedir",
    drawtype = "nodebox",
    node_box = signs_lib.hanging_sign_model.nodebox,
    selection_box = {
                type = "fixed",
                fixed = {-0.45, -0.275, -0.049, 0.45, 0.5, 0.049}
        },
    tiles = {
                "signs_hanging_top.png",
                "signs_hanging_bottom.png",
                "signs_hanging_side.png",
                "signs_hanging_side.png",
                "signs_hanging_back.png",
                "signs_hanging_front.png"
        },
    groups = sign_groups,
    drop = "signs_lib:sign_wall",

    on_construct = function(pos)
        signs_lib.construct_sign(pos)
    end,
    on_destruct = function(pos)
        signs_lib.destruct_sign(pos)
    end,
        on_receive_fields = function(pos, formname, fields, sender)
                signs_lib.receive_fields(pos, formname, fields, sender)
        end,
        on_punch = function(pos, node, puncher)
                signs_lib.update_sign(pos)
        end,
    on_rotate = false,
    sounds = hades_sounds.node_sound_wood_defaults(),
})

-- Locked wall sign

minetest.register_privilege("sign_editor", "Can edit all locked signs")

minetest.register_node("signs_lib:sign_wall_locked", {
        description = S("Locked Wooden Sign"),
        _tt_help = S("Write text on it, owned by placer"),
        inventory_image = "signs_locked_inv.png",
        wield_image = "signs_locked_inv.png",
        is_ground_content = false,
        node_placement_prediction = "",
        paramtype = "light",
        sunlight_propagates = true,
        paramtype2 = "facedir",
        drawtype = "nodebox",
        node_box = signs_lib.wall_sign_model.nodebox,
        tiles = {
                "signs_top_locked.png",
                "signs_bottom_locked.png",
                "signs_side_locked.png",
                "signs_side_locked.png",
                "signs_back.png",
                "signs_front_locked.png"
        },
        groups = sign_wall_groups,
        on_place = function(itemstack, placer, pointed_thing)
                return signs_lib.determine_sign_type(itemstack, placer, pointed_thing, true)
        end,
        on_construct = function(pos)
                signs_lib.construct_sign(pos, true)
        end,
        on_destruct = function(pos)
                signs_lib.destruct_sign(pos)
        end,
        on_receive_fields = function(pos, formname, fields, sender)
                local meta = minetest.get_meta(pos)
                local owner = meta:get_string("owner")
                local pname = sender:get_player_name() or ""
                if pname ~= owner and pname ~= minetest.settings:get("name")
                  and not minetest.check_player_privs(pname, {sign_editor=true}) then
                        return
                end
                signs_lib.receive_fields(pos, formname, fields, sender, true)
        end,
        on_punch = function(pos, node, puncher)
                signs_lib.update_sign(pos)
        end,
        can_dig = function(pos, player)
                local meta = minetest.get_meta(pos)
                local owner = meta:get_string("owner")
                local pname = player:get_player_name()
                return pname == owner or pname == minetest.settings:get("name")
                        or minetest.check_player_privs(pname, {sign_editor=true})
        end,
        on_rotate = false,
        sounds = hades_sounds.node_sound_wood_defaults(),
})

-- metal, colored signs

local sign_colors = { "green", "yellow", "red", "white_red", "white_black" }
local sign_descs = { S("Green Steel Sign"), S("Yellow Steel Sign"), S("Red Steel Sign"), S("White Steel Sign with Red Border"), S("White Steel Sign with Black Border") }

for i, color in ipairs(sign_colors) do
        minetest.register_node("signs_lib:sign_wall_"..color, {
                description = sign_descs[i],
                _tt_help = S("Write text on it"),
                inventory_image = "signs_"..color.."_inv.png",
                is_ground_content = false,
                wield_image = "signs_"..color.."_inv.png",
                node_placement_prediction = "",
                paramtype = "light",
                sunlight_propagates = true,
                paramtype2 = "facedir",
                drawtype = "nodebox",
                node_box = signs_lib.wall_sign_model.nodebox,
                tiles = {
                        "signs_metal_tb.png",
                        "signs_metal_tb.png",
                        "signs_metal_sides.png",
                        "signs_metal_sides.png",
                        "signs_metal_back.png",
                        "signs_"..color.."_front.png"
                },
                groups = sign_wall_groups,
                on_place = function(itemstack, placer, pointed_thing)
                        return signs_lib.determine_sign_type(itemstack, placer, pointed_thing)
                end,
                on_construct = function(pos)
                        signs_lib.construct_sign(pos)
                end,
                on_destruct = function(pos)
                        signs_lib.destruct_sign(pos)
                end,
                on_receive_fields = function(pos, formname, fields, sender)
                        signs_lib.receive_fields(pos, formname, fields, sender)
                end,
                on_punch = function(pos, node, puncher)
                        signs_lib.update_sign(pos)
                end,
                on_rotate = false,
                sounds = hades_sounds.node_sound_metal_defaults(),
        })
end

local signs_text_on_activate

signs_text_on_activate = function(self)
        local meta = minetest.get_meta(self.object:get_pos())
        local text = meta:get_string("text")
        local new = (meta:get_int("__signslib_new_format") ~= 0)
        if text then
                text = trim_input(text)
                set_obj_text(self.object, text, new)
        end
end

minetest.register_entity("signs_lib:text", {
    physical = false,
    pointable = false,
    visual = "upright_sprite",
    textures = {},
    on_activate = signs_text_on_activate,
})

-- And the good stuff here! :-)

build_char_db()

-- restore signs' text after /clearobjects and the like

minetest.register_abm({
        label = "Respawn sign text",
        nodenames = signs_lib.sign_node_list,
        interval = 15,
        chance = 1,
        action = function(pos, node, active_object_count, active_object_count_wider)
                signs_lib.update_sign(pos)
        end
})

minetest.register_craft({
        output = "signs_lib:sign_wall",
        recipe = {
                {"group:wood", "group:wood", "group:wood"},
                {"group:wood", "group:wood", "group:wood"},
                {"", "group:stick", ""},
        },
})

minetest.register_craft({
        type = "fuel",
        recipe = "signs_lib:sign_wall",
        burntime = 10,
})

-- locked sign

minetest.register_craft({
        output = "signs_lib:sign_wall_locked",
        recipe = {
                {"group:wood", "group:wood", "group:wood"},
                {"hades_core:steel_ingot", "group:wood", "group:wood"},
                {"", "group:stick", ""},
        }
})

--Alternate recipe.

minetest.register_craft({
        output = "signs_lib:sign_wall_locked",
        recipe = {
                {"signs_lib:sign_wall"},
                {"hades_core:steel_ingot"},
    },
})

minetest.register_craft({
        type = "fuel",
        recipe = "signs_lib:sign_wall_locked",
        burntime = 10,
})

-- craft recipes for the metal signs

minetest.register_craft( {
        output = "signs_lib:sign_wall_green 4",
        recipe = {
                        { "dye:dark_green", "dye:white", "dye:dark_green" },
                        { "hades_core:steel_ingot", "hades_core:steel_ingot", "hades_core:steel_ingot" }
        },
})
minetest.register_craft( {
        output = "signs_lib:sign_wall_yellow 4",
        recipe = {
                        { "dye:yellow", "dye:black", "dye:yellow" },
                        { "hades_core:steel_ingot", "hades_core:steel_ingot", "hades_core:steel_ingot" }
        },
})
minetest.register_craft( {
        output = "signs_lib:sign_wall_red 4",
        recipe = {
                        { "dye:red", "dye:white", "dye:red" },
                        { "hades_core:steel_ingot", "hades_core:steel_ingot", "hades_core:steel_ingot" }
        },
})
minetest.register_craft( {
        output = "signs_lib:sign_wall_white_red 4",
        recipe = {
                        { "dye:white", "dye:red", "dye:white" },
                        { "hades_core:steel_ingot", "hades_core:steel_ingot", "hades_core:steel_ingot" }
        },
})
minetest.register_craft( {
        output = "signs_lib:sign_wall_white_black 4",
        recipe = {
                        { "dye:white", "dye:black", "dye:white" },
                        { "hades_core:steel_ingot", "hades_core:steel_ingot", "hades_core:steel_ingot" }
        },
})
if minetest.settings:get("log_mods") then
        minetest.log("action", "signs loaded")
end