Pipestatus and command substitutions

[runiq]

fish version 3.0.2.

I'd like to split the output of fzf --print0 (which writes NUL-delimited output) on NUL bytes and write it into a variable. As far as I'm aware, that requires fzf --print0 | string split0, otherwise all output after the first NUL byte will be cut off.

However, fzf also returns a meaningful exit code if it was aborted, and I'd like to do something with that exit code. Piping fzf into another command gives me no way to get at fzf's exit code.

Is there a way for me to have my cake and eat it too? :)

[krobelus]

Wait, what is the use of --print0? Doesn't fzf split by newlines already, so there won't be newlines in the selected items?

Anyway you can get exit status of the individual commands in the pipe with the $pipestatus variable. See also https://fishshell.com/docs/current/tutorial.html?highlight=pipestatus#exit-status.

[faho]

Anyway you can get exit status of the individual commands in the pipe with the $pipestatus variable. See also https://fishshell.com/docs/current/tutorial.html?highlight=pipestatus#exit-status.

The problem with $pipestatus here is that it doesn't work with command substitutions and set, so the naive

set -l res (fzf --print0 | string split0)
echo $pipestatus

will print just the status of string split0.

[soumya92]

Also fixed by #6820

~> set -l res (seq 1 10 | fzf --print0 | string split0); echo $pipestatus
(select "2")
0 0 0

~> set -l res (seq 1 10 | fzf --print0 | string split0); echo $pipestatus
(^D)
0 130 1