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20243132fb
This tries to open the given file to use as stdin, and if it fails,
for any reason, it uses /dev/null instead.
This is useful in cases where we would otherwise do either of these:
```fish
test -r /path/to/file
and string match foo < /path/to/file
cat /path/to/file 2>/dev/null | string match foo
```
This both makes it nicer and shorter, *and* helps with TOCTTOU - what if the file is removed/changed after the check?
The reason for reading /dev/null instead of a closed fd is that a closed fd will often cause an error.
In case opening /dev/null fails, it still skips the command.
That's really a last resort for when the operating system
has turned out to be a platypus and not a unix.
Fixes #4865
(cherry picked from commit
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| .. | ||
| cmds | ||
| python_docs_theme | ||
| commands.rst | ||
| completions.rst | ||
| conf.py | ||
| contributing.rst | ||
| design.rst | ||
| faq.rst | ||
| fish_for_bash_users.rst | ||
| fish_indent_lexer.py | ||
| fish_synopsis.py | ||
| index.rst | ||
| interactive.rst | ||
| language.rst | ||
| license.rst | ||
| prompt.rst | ||
| relnotes.rst | ||
| tutorial.rst | ||