A little off-topic, but I'd love to see a tool similar to this that provides real-time previews for an entire shell pipeline which, most importantly, integrates into the shell. This allows for leveraging the completion system to complete command-line flags and using the line editor to navigate the pipeline.
In zsh, the closest thing I've gotten to this was to bind Ctrl-\ to the `accept-and-hold` zle widget, which executes what is in the current buffer while still retaining it and the cursor position. That gets me close (no more ^P^B^B^B^B for editing), but I'd much rather see the result of the pipeline in real-time rather than having to manually hit a key whenever I want to see the result.
In zsh, the closest thing I've gotten to this was to bind Ctrl-\ to the `accept-and-hold` zle widget, which executes what is in the current buffer while still retaining it and the cursor position. That gets me close (no more ^P^B^B^B^B for editing), but I'd much rather see the result of the pipeline in real-time rather than having to manually hit a key whenever I want to see the result.