tmux’s parser has no clever trick in it. It’s a state machine with a transition cache, a bsearch(), a trie, and a width cache — four small optimisations, each of which swaps an…
The hard part of tmux’s pane splitting isn’t the geometry — it’s serialisability.
clean_name() is tmux’s one defence against name-based injection, and it works by encoding rather than filtering: it stores names in a form where the dangerous characters…
ncurses assumes one application owns one terminal. A multiplexer owns N screens and has to render them into one terminal without the terminal knowing.
tmux -C gives you a scriptable protocol with zero authentication — anything that can open the socket can run run-shell.