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30 lines
560 B
Fish
30 lines
560 B
Fish
function isatty -d "Tests if a file descriptor is a tty"
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set -l options h/help
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argparse -n isatty $options -- $argv
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or return
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if set -q _flag_help
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__fish_print_help isatty
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return 0
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end
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if set -q argv[2]
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printf (_ "%s: Too many arguments") isatty >&2
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return 1
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end
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set -l fd
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switch "$argv"
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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 $argv[1]
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end
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test -t "$fd"
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end
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