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function isatty -d "Tests if a file descriptor is a tty"
set -l fd 0
if count $argv >/dev/null
switch $argv[1]
case -h --h --he --hel --help
__fish_print_help isatty
return 0
case stdin ''
set fd 0
case stdout
set fd 1
case stderr
set fd 2
case '*'
set fd $argv[1]
end
end
# Use `command test` because `builtin test` doesn't open the regular fd's.
# See https://github.com/fish-shell/fish-shell/issues/1228
command test -t "$fd"
end
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