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docs/language: update target release for feature flags from 3.8 to 4.0

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(cherry picked from commit 1cf71656ef)
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David Adam 2025-01-29 20:27:08 +08:00
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@ -2028,11 +2028,11 @@ You can see the current list of features via ``status features``::
Here is what they mean:
- ``stderr-nocaret`` was introduced in fish 3.0 and cannot be turned off since fish 3.5. It can still be tested for compatibility, but a ``no-stderr-nocaret`` value will simply be ignored. The flag made ``^`` an ordinary character instead of denoting an stderr redirection. Use ``2>`` instead.
- ``qmark-noglob`` was also introduced in fish 3.0 (and made the default in 3.8). It makes ``?`` an ordinary character instead of a single-character glob. Use a ``*`` instead (which will match multiple characters) or find other ways to match files like ``find``.
- ``qmark-noglob`` was also introduced in fish 3.0 (and made the default in 4.0). It makes ``?`` an ordinary character instead of a single-character glob. Use a ``*`` instead (which will match multiple characters) or find other ways to match files like ``find``.
- ``regex-easyesc`` was introduced in 3.1 (and made the default in 3.5). It makes it so the replacement expression in ``string replace -r`` does one fewer round of escaping. Before, to escape a backslash you would have to use ``string replace -ra '([ab])' '\\\\\\\\$1'``. After, just ``'\\\\$1'`` is enough. Check your ``string replace`` calls if you use this anywhere.
- ``ampersand-nobg-in-token`` was introduced in fish 3.4 (and made the default in 3.5). It makes it so a ``&`` i no longer interpreted as the backgrounding operator in the middle of a token, so dealing with URLs becomes easier. Either put spaces or a semicolon after the ``&``. This is recommended formatting anyway, and ``fish_indent`` will have done it for you already.
- ``remove-percent-self`` turns off the special ``%self`` expansion. It was introduced in 3.8. To get fish's pid, you can use the :envvar:`fish_pid` variable.
- ``test-require-arg`` removes :doc:`builtin test <cmds/test>`'s one-argument form (``test "string"``. It was introduced in 3.8. To test if a string is non-empty, use ``test -n "string"``. If disabled, any call to ``test`` that would change sends a :ref:`debug message <debugging-fish>` of category "deprecated-test", so starting fish with ``fish --debug=deprecated-test`` can be used to find offending calls.
- ``remove-percent-self`` turns off the special ``%self`` expansion. It was introduced in 4.0. To get fish's pid, you can use the :envvar:`fish_pid` variable.
- ``test-require-arg`` removes :doc:`builtin test <cmds/test>`'s one-argument form (``test "string"``. It was introduced in 4.0. To test if a string is non-empty, use ``test -n "string"``. If disabled, any call to ``test`` that would change sends a :ref:`debug message <debugging-fish>` of category "deprecated-test", so starting fish with ``fish --debug=deprecated-test`` can be used to find offending calls.
These changes are introduced off by default. They can be enabled on a per session basis::