Slides using jsbueno/terminedia for quickly explaining the concept of tail recursion optimizations. Used to illustrate a lightning talk on a proof of concept decorator for usng async tasks to have tail-recursion optimization: https://gist.github.com/jsbueno/7644e94bbaa4fbaa8b5e8f4d2bd71425

slide_tail_rec.py

import time

import terminedia as TM
from terminedia import V2, Color, pause, shape

SIZE = 170, 50

def hto8(pos):
    return (V2(pos) * 0.0625).as_int

def hto4(pos):
    return (V2(pos) * 0.125).as_int

def hto2(pos):
    return (V2(pos) * 0.25).as_int

def hto1(pos):
    return (V2(pos) * 0.5).as_int

colorseq = [(0.7, 0.7, 1), (1, 1, .7)] * 10


def sl1(size=15):
    sl = TM.shape(SIZE)
    label_col = (20 + 2 * size)
    left = 10
    for i, bottom in enumerate(range(98, 10, -size)):
        sl.context.color = colorseq[i]
        sl.high.draw.rect((left, bottom - size, size * 2 + left, bottom), fill=True)
        sl.text[4].at(hto4((label_col,  (bottom - size / 2))) , f"chamada {i}")

    second_col = 140
    # sl.context.char = "1"
    sl.context.color = "white"
    sl.text[8].at(hto8((second_col, 0)), "recursão")

    return sl


def sl2(size=15):
    sl = TM.shape(SIZE)
    label_col = (20 + 2 * size)
    bottom = 98

    for i, left in enumerate(range(10, 160, size * 2)):
        sl.context.color = colorseq[i]
        sl.high.draw.rect((left, bottom - size, size * 2 + left, bottom), fill=True)
        sl.text[2].at(hto2((left // 2,  (bottom - size) - 4)) + (1,0) , f"ch{i}")

    second_col = 140
    # sl.context.char = "1"
    sl.context.color = "white"
    sl.text[4].at(hto4((second_col, 0)), "tail recursion")
    sl.text[4].at(hto4((second_col, 8)), "optimization")

    return sl


def sl3(size=15):
    sl = TM.shape(SIZE)
    label_col = (20 + 2 * size)
    bottom = 98

    left = 10
    for i, bottom in enumerate(range(98, 10, -size)):
        sl.context.color = colorseq[i] if i != 1 else (1,1,0)
        sl.high.draw.rect((left, bottom - size, size * 2 + left, bottom), fill=i < 2)
        sl.text[4].at(hto4((label_col,  (bottom - size / 2))) ,
                      f"chamada {i}" if i != 1 else "decorator"  )

    bottom = 98
    for i, left in enumerate(range(20 + 2 * size, 160, size * 2)):
        sl.context.color = colorseq[i]
        sl.high.draw.rect((left, bottom - size, size * 2 + left, bottom), fill= True)
        # sl.text[2].at(hto2((left // 2,  (bottom - size) - 4)) + (1,0) , f"task{i}")

    second_col = 140
    # sl.context.char = "1"
    sl.context.color = "white"
    sl.text[4].at(hto4((second_col, 0)), "task wrapper")
    sl.text[4].at(hto4((second_col, 8)), "decorator")

    return sl


def main():
    screen = TM.Screen()
    slides = [sl1, sl2, sl3]

    with screen:
        prev_slide = None
        slide_i = 0
        while True:
            if slide_i != prev_slide:
                screen.clear()
                slide = slides[slide_i]()

                with screen.commands:
                    screen.blit((0,0), slide)
                prev_slide = slide_i
                time.sleep(0.5)
            with TM.keyboard():
                time.sleep(1/30)
                key = TM.inkey()
            if key == TM.KeyCodes.LEFT:
                slide_i -= 1
            elif key in (TM.KeyCodes.RIGHT, "\r"):
                slide_i += 1
            elif key in ("q", TM.KeyCodes.ESC):
                break
            if slide_i < 0:
                slide_i = len(slides) - 1
            elif slide_i >= len(slides):
                slide_i = 0
            time.sleep(1/30)


if __name__ == "__main__":
    main()