get all Lua functions (and globals)

getVariables.lua

-- usage: just call it in a Lua environment and look for a file called out.txt

-- lists all global variables in a file
function writeAllGlobals()	
	local file = io.open("out.txt", "w+")

    local seen={}
    local function dump(t,i)
        seen[t]=true
        local s={}
        local n=0
        for k, v in pairs(t) do
            n=n+1
			s[n]=tostring(k)
        end
        table.sort(s)
        for k,v in ipairs(s) do
            file:write(i .. v .. "\n")
            v=t[v]
            if type(v)=="table" and not seen[v] then
                dump(v,i.."\t")
            end
        end
    end

    dump(_G,"")
	file:close()
end

-- version with print
-- can be tested here: https://www.lua.org/cgi-bin/demo
function printAllGlobals()
	local seen={}
	local function dump(t,i)
		seen[t]=true
		local s={}
		local n=0
		for k, v in pairs(t) do
			n=n+1
			s[n]=tostring(k)
		end
		table.sort(s)
		for k,v in ipairs(s) do
			print(i .. v)
			v=t[v]
			if type(v)=="table" and not seen[v] then
				dump(v,i.."\t")
			end
		end
	end

	dump(_G,"")
end

-- printAllGlobals()