Thanks

Can any other Fish expert here check it's Ok ? @Lucretiel @offbyone @akx @basbebe

Code golfing a bit the launcher could even be:

function br --wraps=broot
    function _broot
        broot --outcmd $argv[1] $argv[2..] && source $argv[1]
    end

    _broot (: | psub) $argv
end

Albeit cryptic for those unfamiliar with fish 😅

I'm sad no other fish user can check this

A side effect of your change is that the temp file is removed only after the execution of the command

True but practically no difference. Even if source fails for some mysterious reason rm will continue to be run just as fine; if the shell blows up after source then we have much bigger problems than not getting to clean up a temporary file.

Thanks!