1 files changed, 93 insertions, 0 deletions

diff --git a/builtin/common/misc_helpers.lua b/builtin/common/misc_helpers.lua
index d2356b505..f8a905c7b 100644
--- a/builtin/common/misc_helpers.lua
+++ b/builtin/common/misc_helpers.lua
@@ -516,6 +516,17 @@ function table.shuffle(t, from, to, random)
 end
 
 
+function table.combine(t, other)
+	other = other or {}
+	for k, v in pairs(other) do
+		if type(v) == "table" and type(t[k]) == "table" then
+			table.combine(t[k], v)
+		else
+			t[k] = v
+		end
+	end
+end
+
 --------------------------------------------------------------------------------
 -- mainmenu only functions
 --------------------------------------------------------------------------------
@@ -583,6 +594,66 @@ function core.colorize(color, message)
 	return table.concat(lines, "\n") .. core.get_color_escape_sequence("#ffffff")
 end
 
+local function rgb_to_hex(rgb)
+	local hexadecimal = "#"
+
+	for key, value in pairs(rgb) do
+		local hex = ""
+
+		while(value > 0)do
+			local index = math.fmod(value, 16) + 1
+			value = math.floor(value / 16)
+			hex = string.sub("0123456789ABCDEF", index, index) .. hex
+		end
+
+		if(string.len(hex) == 0)then
+			hex = "00"
+		elseif(string.len(hex) == 1)then
+			hex = "0" .. hex
+		end
+
+		hexadecimal = hexadecimal .. hex
+	end
+
+	return hexadecimal
+end
+
+local function color_from_hue(hue)
+	local h = hue / 60
+	local c = 255
+	local x = (1 - math.abs(h % 2 - 1)) * 255
+
+	local i = math.floor(h)
+	if i == 0 then
+		return rgb_to_hex({c, x, 0})
+	elseif i == 1 then
+		return rgb_to_hex({x, c, 0})
+	elseif i == 2 then
+		return rgb_to_hex({0, c, x})
+	elseif i == 3 then
+		return rgb_to_hex({0, x, c})
+	elseif i == 4 then
+		return rgb_to_hex({x, 0, c})
+	else
+		return rgb_to_hex({c, 0, x})
+	end
+end
+
+function core.rainbow(input)
+	local step = 360 / input:len()
+	local hue = 0
+	local output = ""
+	for i = 1, input:len() do
+		local char = input:sub(i, i)
+		if char:match("%s") then
+			output = output .. char
+		else
+			output = output  .. core.get_color_escape_sequence(color_from_hue(hue)) .. char
+		end
+		hue = hue + step
+	end
+	return output
+end
 
 function core.strip_foreground_colors(str)
 	return (str:gsub(ESCAPE_CHAR .. "%(c@[^)]+%)", ""))
@@ -636,6 +707,19 @@ function core.get_translator(textdomain)
 	return function(str, ...) return core.translate(textdomain or "", str, ...) end
 end
 
+function core.get_pointed_thing_position(pointed_thing, above)
+	if pointed_thing.type == "node" then
+		if above then
+			-- The position where a node would be placed
+			return pointed_thing.above
+		end
+		-- The position where a node would be dug
+		return pointed_thing.under
+	elseif pointed_thing.type == "object" then
+		return pointed_thing.ref and pointed_thing.ref:get_pos()
+	end
+end
+
 --------------------------------------------------------------------------------
 -- Returns the exact coordinate of a pointed surface
 --------------------------------------------------------------------------------
@@ -768,3 +852,12 @@ function core.parse_coordinates(x, y, z, relative_to)
 	local rz = core.parse_relative_number(z, relative_to.z)
 	return rx and ry and rz and { x = rx, y = ry, z = rz }
 end
+
+function core.inventorycube(img1, img2, img3)
+	img2 = img2 or img1
+	img3 = img3 or img1
+	return "[inventorycube"
+			.. "{" .. img1:gsub("%^", "&")
+			.. "{" .. img2:gsub("%^", "&")
+			.. "{" .. img3:gsub("%^", "&")
+end