Helpful scripts

[Sheepolution]

Sometimes a script is too simple for you to turn into a library, or maybe they are depended on another library's features. But that doesn't mean we should keep them for ourselves. What are some scripts that have really helped you and is since then in almost all your projects?

I'll start with a few examples:

Asset (uses Classic, like most of my scripts)

Code: Select all

local Asset = Object:extend()

local function stripString(base, s)
	local a = s:sub(base:len()+2,s:len())
	return a:sub(0, a:find("%.")-1)
end


local function loadFiles(base, dir, files)
	dir = dir or base
	local items = love.filesystem.getDirectoryItems(dir)
	for i,v in ipairs(items) do
		local file = dir .. "/" .. v
		if love.filesystem.isFile(dir .. "/" .. v) then
			files[
			stripString(base, file)
		 	] = file
		else
			loadFiles(base, dir .. "/" .. v, files)
		end
	end

	return files
end


function Asset:new()
	self.imgCache = {}
	self.imgDirs = loadFiles("images", nil,{})
end

function Asset:image(url, force)
	if not self.imgDirs[url] then error('The image "' .. url .. '" does not exist!') end
	local img
	if force or not self.imgCache[url] then
		img = love.graphics.newImage(self.imgDirs[url])
		self.imgCache[url] = img
	else
		img = self.imgCache[url]
	end
	return img
end


function Asset:__tostring()
	return "Asset"
end


return Asset

Allows me to do this:

Code: Select all

img = Asset:image("nameOfImage")

-- Instead of...
img = love.graphics.newImage("images/nameOfImage.png")

And for input (uses Classic and Lume):

Code: Select all

local Input = Object:extend()

function Input:new()
	self._pressed = {}
	self._released = {}
	self._custom = {}
end


function Input:reset()
	self._pressed = {}
	self._released = {}
end


function Input:isPressed(...)
	return lume.any({...}, function (a) return self._custom[a] and lume.any(self._custom[a], function (b) return lume.find(self._pressed, b) end) end)
end


function Input:isReleased(...)
	return lume.any({...}, function (a) return self._custom[a] and lume.any(self._custom[a], function (b) return lume.find(self._released, b) end) end)
end


function Input:isDown(...)
	return lume.any({...}, function (a) return self._custom[a] and lume.any(self._custom[a], function (b) return love.keyboard.isDown(b) end) end)
end


function Input:set(name, t)
	self._custom[name] = t
end


function Input:inputpressed(input)
	table.insert(self._pressed, input)
	if not self._custom[input] then
		self._custom[input] = {input}
	end
end


function Input:inputreleased(input)
	table.insert(self._released, input)
end


function Input:__tostring()
	return "Input | pressed: " .. (unpack(self._pressed) or " ") .. ", released: " .. (unpack(self._released) or " ")
end


return Input

Which allows me to do this:

Code: Select all

Input:set("jump",{"space","up","w"})
Input:isPressed("jump")

[Robin]

You're not setting the cache, tho.

[Sheepolution]

You're not setting the cache, tho.

Oops, looks like that was an old version actually. Thanks for the tip.

[Inny]

I'm gradually evolving a underscore/lodash/moses style utility-belt library. I periodically upload it to this gist: https://gist.github.com/inmatarian/5ea8da95491b25c8c362