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fish-shell/share/functions/isatty.fish

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function isatty -d "Tests if a file descriptor is a tty"
set -l options h/help
argparse -n isatty $options -- $argv
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or return
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if set -q _flag_help
__fish_print_help isatty
return 0
end
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if set -q argv[2]
printf (_ "%s: Too many arguments") isatty >&2
return 1
end
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set -l fd
switch "$argv"
case stdin ''
set fd 0
case stdout
set fd 1
case stderr
set fd 2
case '*'
set fd $argv[1]
end
test -t "$fd"
end