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Clarify that optional option arguments must have no separating space

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Unless we use "complete --require-parameter", we must say "-w32",
not "-w 32", because the second "32" is a positional argument.

Notably, old options do not have this behavior, which is a bit weird,
see #8465

Taken from a discussion in #8459
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Johannes Altmanninger 2021-11-22 21:08:56 +01:00
parent 0d309b0d9e
commit 41be9fa9fd
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doc_src/cmds/complete.rst
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@ -64,11 +64,11 @@ the fish manual.
Command specific tab-completions in ``fish`` are based on the notion of options and arguments. An option is a parameter which begins with a hyphen, such as ``-h``, ``-help`` or ``--help``. Arguments are parameters that do not begin with a hyphen. Fish recognizes three styles of options, the same styles as the GNU getopt library. These styles are:
- Short options, like ``-a``. Short options are a single character long, are preceded by a single hyphen and can be grouped together (like ``-la``, which is equivalent to ``-l -a``). Option arguments may be specified in the following parameter (``-w 32``) or by appending the option with the value (``-w32``).
- Short options, like ``-a``. Short options are a single character long, are preceded by a single hyphen and can be grouped together (like ``-la``, which is equivalent to ``-l -a``). Option arguments may be specified by appending the option with the value (``-w32``), or, if ``--require-parameter`` is given, in the following parameter (``-w 32``).
- Old style long options, like ``-Wall`` or ``-name``. Old style long options can be more than one character long, are preceded by a single hyphen and may not be grouped together. Option arguments are specified in the following parameter (``-ao null``) or after a ``=`` (``-ao=null``).
- GNU style long options, like ``--colors``. GNU style long options can be more than one character long, are preceded by two hyphens, and can't be grouped together. Option arguments may be specified in the following parameter (``--quoting-style shell``) or after a ``=`` (``--quoting-style=shell``).
- GNU style long options, like ``--colors``. GNU style long options can be more than one character long, are preceded by two hyphens, and can't be grouped together. Option arguments may be specified after a ``=`` (``--quoting-style=shell``), or, if ``--require-parameter`` is given, in the following parameter (``--quoting-style shell``).
Multiple commands and paths can be given in one call to define the same completions for multiple commands.