Operations.set_hook

Set a hook to a nonempty command list. Without an index, replace the whole hook array, or fill the lowest free index when appending. An explicit @name custom hook stores command text as a user option; it requires complete replacement and has no array indexes. read_hook returns its Options.Text value; bulk hook capture includes built-ins. Commands may cause arbitrary tmux effects when triggered. Hooks that print output are outside the supported control transport contract.