How to show commands being executed in fish shell function

I have a function in fish shell that calls a bunch of commands sequentially.

How do I add the commands that are being executed to the output?

Essentially if I had a bash script doing that I would add set -x at the beginning. Is there a way to do that for fish shell functions?

Solution

As answered in a similar question, this feature now exists!

You can set the variable fish_trace to a non-empty value to enable echoing of the commands, similar to set -x. Erasing the variable stops the echoing again:

Emily@Peach ~> echo hell
hell
Emily@Peach ~> set fish_trace 1
Emily@Peach ~> echo hell
> echo hell
hell
Emily@Peach ~> set -e fish_trace
> set -e fish_trace
Emily@Peach ~> echo hell
hell