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