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https://github.com/fish-shell/fish-shell
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60808a4820
Presently, `isatty` only works on a handful of keywords. Here it is rewritten to be able to take any path, device or fd number as an argument, and eliminates errors printed to stdout. Per discussion in #1228, using `builtin test -c` within a pipe to test special file descriptors is not viable, so this implementation specifcially uses `command test`. Additionally, a note has been added to the documentation of `test` regarding this potential aberration from the expected output of the test utility under the 'Standards' section.
27 lines
692 B
Fish
27 lines
692 B
Fish
function isatty -d "Test if a file or file descriptor is a tty."
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# Use `command test` because `builtin test` doesn't open the regular fd's.
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switch "$argv"
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case '-h*' '--h*'
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__fish_print_help isatty
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case ''
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command test -c /dev/stdin
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case '*'
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if test -e "$argv" # The eval here is needed for symlinks. Unsure why.
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command test -c "$argv"; and eval tty 0>"$argv" >/dev/null
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else if test -e /dev/"$argv"
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command test -c /dev/"$argv"; and tty 0>/dev/"$argv" >/dev/null
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else if test -e /dev/fd/"$argv"
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command test -c /dev/fd/"$argv"; and tty 0>/dev/fd/"$argv" >/dev/null
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else
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return 1
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end
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end
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end
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