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isatty: revert to previous behaviour

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This partially reverts commit 60808a4820.
This commit is contained in:
David Adam 2015-02-01 17:11:44 +08:00
parent 793784c087
commit 66acd17bc0
2 changed files with 27 additions and 24 deletions
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14
doc_src/isatty.txt
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@ -1,15 +1,17 @@
\section isatty isatty - test if a file or file descriptor is a tty. \section isatty isatty - test if a file descriptor is a tty.
\subsection isatty-synopsis Synopsis \subsection isatty-synopsis Synopsis
\fish{synopsis} \fish{synopsis}
isatty [FILE | DEVICE | FILE DESCRIPTOR NUMBER] isatty [FILE DESCRIPTOR]
\endfish \endfish
\subsection isatty-description Description \subsection isatty-description Description
`isatty` tests if a file or file descriptor is a tty. The argument may be in the form of a file path, device, or file descriptor number. Without an argument, `standard input` is implied. `isatty` tests if a file descriptor is a tty.
If the resolved file descriptor is a tty, the command returns zero. Otherwise, the command exits one. No messages are printed to standard error. `FILE DESCRIPTOR` may be either the number of a file descriptor, or one of the strings `stdin`, `stdout`, or `stderr`.
If the specified file descriptor is a tty, the exit status of the command is zero. Otherwise, the exit status is non-zero. No messages are printed to standard error.
\subsection isatty-examples Examples \subsection isatty-examples Examples
@ -20,14 +22,14 @@ From an interactive shell, the commands below exit with a return value of zero:
isatty isatty
isatty stdout isatty stdout
isatty 2 isatty 2
echo | isatty /dev/fd/1 echo | isatty 1
\endfish \endfish
And these will exit non-zero: And these will exit non-zero:
\fish \fish
echo | isatty echo | isatty
isatty /dev/fd/9 isatty 9
isatty stdout > file isatty stdout > file
isatty 2 2> file isatty 2 2> file
\endfish \endfish

37
share/functions/isatty.fish
View file

@ -1,27 +1,28 @@
function isatty -d "Test if a file or file descriptor is a tty."
# Use `command test` because `builtin test` doesn't open the regular fd's. function isatty -d "Tests if a file descriptor is a tty"
set -l fd 0
if count $argv >/dev/null
switch $argv[1]
switch "$argv" case -h --h --he --hel --help
__fish_print_help isatty
return 0
case '-h*' '--h*' case stdin
__fish_print_help isatty set fd 0
case '' case stdout
command test -c /dev/stdin set fd 1
case '*' case stderr
if test -e "$argv" # The eval here is needed for symlinks. Unsure why. set fd 2
command test -c "$argv"; and eval tty 0>"$argv" >/dev/null
else if test -e /dev/"$argv" case '*'
command test -c /dev/"$argv"; and tty 0>/dev/"$argv" >/dev/null set fd $argv[1]
else if test -e /dev/fd/"$argv" end
command test -c /dev/fd/"$argv"; and tty 0>/dev/fd/"$argv" >/dev/null end
eval "tty 0>&$fd >/dev/null"
else
return 1
end
end
end end