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manpage: document current and legacy option syntax better

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I thought it ewas already documented, but I'm not seeing it anywhere.
Maybe it did exist, but was deleted.

See #3899.
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wm4 2016-12-12 12:03:25 +01:00
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DOCS/man/mpv.rst
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@ -241,6 +241,16 @@ button 5 and button 6
USAGE
=====
Command line arguments starting with ``-`` are interpreted as options,
everything else as filenames or URLs. All options except *flag* options (or
choice options which include ``yes``) require a parameter in the form
``--option=value``.
One exception is the lone ``-`` (without anything else), which means media data
will be read from stdin. Also, ``--`` (without anything else) will make the
player interpret all following arguments as filenames, even if they start with
``-``. (To play a file named ``-``, you need to use ``./-``.)
Every *flag* option has a *no-flag* counterpart, e.g. the opposite of the
``--fs`` option is ``--no-fs``. ``--fs=yes`` is same as ``--fs``, ``--fs=no``
is the same as ``--no-fs``.
@ -248,6 +258,24 @@ is the same as ``--no-fs``.
If an option is marked as *(XXX only)*, it will only work in combination with
the *XXX* option or if *XXX* is compiled in.
Legacy option syntax
--------------------
The ``--option=value`` syntax is not strictly enforced, and the alternative
legacy syntax ``-option value`` and ``--option value`` will also work. This is
mostly for compatibility with MPlayer. Using these should be avoided. Their
semantics can change any time in the future.
For example, the alternative syntax will consider an argument following the
option a filename. ``mpv -fs no`` will attempt to play a file named ``no``,
because ``--fs`` is a flag option that requires no parameter. If an option
changes and its parameter becomes optional, then a command line using the
alternative syntax will break.
Currently, the parser makes no difference whether an option starts with ``--``
or a single ``-``. This might also change in the future, and ``--option value``
might always interpret ``value`` as filename in order to reduce ambiguities.
Escaping spaces and other special characters
--------------------------------------------