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Q&A how to update RPROMPT each time a key is pressed in zsh

The cause of this problem is that RPROMPT has not yet been set when the self-insert() function is called. So the solution is to define RPROMPT as an empty string (RPROMPT="") somewhere in your .zsh...

posted 6d ago by Trevor‭

Answer
#1: Initial revision by user avatar Trevor‭ · 2025-06-12T03:43:41Z (6 days ago)
The cause of this problem is that `RPROMPT` has not yet been set when the `self-insert()` function is called. So the solution is to define `RPROMPT` as an empty string (`RPROMPT=""`) somewhere in your `.zshrc` file, in a place where it will get defined before ZLE is started.
 
This solution came from [this thread](https://www.zsh.org/mla/users/2025/msg00091.html) on the zsh-users mailing list.