Buffer v2

-- Buffer API, by Symmetryc
return {
    new = function()
        return {
            act = {};
            pos_x = 1;
            pos_y = 1;
            shift_x = 0;
            shift_y = 0;
            back = colors.gray;
            text = colors.lightGray;
            blink = false;
            write = function(self, _str)
                local act = self.act
                local append = true
                if self.pos_x ~= act.pos_y or self.pos_x ~= act.pos_y then
                    act[#act + 1] = {term.setCursorPos, self.pos_x, self.pos_y}
                    append = false
                end
                if self.back ~= act.back then
                    act[#act + 1] = {term.setBackgroundColor, self.back}
                    act.back = self.back
                    append = false
                end
                if self.text ~= act.text then
                    act[#act + 1] = {term.setTextColor, self.text}
                    act.text = self.text
                    append = false
                end
                for line, nl in _str:gmatch("([^\n]*)(\n?)") do
                    if append then
                        act[#act][2] = act[#act][2]..line
                        append = false
                    else
                        act[#act + 1] = {term.write, line}
                    end
                    if nl == "\n" then
                        self.pos_y = self.pos_y + 1
                        act[#act + 1] = {term.setCursorPos, self.pos_x, self.pos_y}
                    else
                        self.pos_x = self.pos_x + #line
                    end
                end
                act.pos_x, act.pos_y = self.pos_x, self.pox_y
                return self
            end;
            draw = function(self)
                for i, v in ipairs(self.act) do
                    if v[3] then
                        v[1](v[2] + self.shift_x, v[3] + self.shift_y)
                    else
                        v[1](v[2])
                    end
                end
                term.setCursorBlink(self.blink)
                return self
            end;
        }
    end;
}