Well, tui[0] kinda split between two things. -- a) draw full text page & display (aka just echo & with appropriate padding to fill out line b) text/text graphic character placement using control character sequences such as ansi escape sequences. The whole idea for tui is not to have to worry about graphics driver setups/invalid shell string characters. Not sure if plotex's text dithering method to display 'rick rolling in terminal' counts as tui (vs. ascii-animator method).[6][7]

linux framebuffer would be simplest -- one example library[1]. Pygame has many different backends that do non-tui (opengl, directx, windib, X11, linux frame buffer )[1]

Since shell is "string oriented", one would need to use a program such as cliffi[3] to make full use of lvgl and/or an associated shell plugin which provides lvgl shell extensions.

Python/gtk/pyqt[5]etc with usable gui at command line would be bit 'easier' than trying to graft bash with graphics at command line.

[7] : https://pypi.org/project/ascii-animator/

[6] : https://medium.com/@SrvZ/how-to-create-stunning-graphs-in-th...

[5] : https://python.plainenglish.io/modern-python-guis-with-pyqt-...

[4] : https://medium.com/@SrvZ/how-to-create-stunning-graphs-in-th...

[3] cliffi : https://github.com/ysaxon/cliffi

[2] pygame : https://www.pygame.org/wiki/about

[1] lvgl : https://blog.lvgl.io/2018-01-03/linux_fb

[0] tui : https://en.wikipedia.org/wiki/Text-based_user_interface

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