1 files changed, 85 insertions, 0 deletions
diff --git a/builtin/common/misc_helpers.lua b/builtin/common/misc_helpers.lua
index e29a9f422..db94e7073 100644
--- a/builtin/common/misc_helpers.lua
+++ b/builtin/common/misc_helpers.lua
@@ -517,6 +517,17 @@ 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
 --------------------------------------------------------------------------------
@@ -584,6 +595,67 @@ 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@[^)]+%)", ""))
@@ -637,6 +709,19 @@ 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
 --------------------------------------------------------------------------------