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Rendering complex scripts in terminal and OSC 66


As a programmer, I spend most of my time in a terminal application like Kitty. I use Neovim as my code editor. I use CLI based AI agents. But the biggest pain, even in 2026, is that there is no terminal that can render complex scripts like Indic languages or Arabic. This is a significant limitation for me, as most of my work involves language processing. In this article, I will give a brief overview of why this issue remains unsolved—covering the character-cell grid model, width measurement, and the distinction between text shaping and rendering—along with ongoing efforts and a small tool I built recently that illustrates a solution path.

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