buffer

-- Buffer API, by Symmetryc
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
function draw(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