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Just like with _VAL strings, also _ARG strings do not need to
be present - as we can easily check for LONG opt version just
by adding attribute.
With attribute ARG_LONG_OPT string arg name[] becomes unused
and can be safely removed.
Also within _find_command_id_function() we do not need to handle
'command_enum == CMD_NONE' as separate case and just use single loop.
Instead of storing command_id as string, direcly
translate string to enum index and use 'command_enum()'
to get string when needed for printing.
This way we can easily detect error in the structure
while parsing it - and we can later avoid separate
'translation' loop.
We can more efficiently use command_name struct to
lookup for lvm_command_enum and avoid many repeated
command name searches since we already know
the enum index that is now stored in 'struct command'.
Split struct command_name to the constant part (keep the name)
and new 'struct command_name_args' which holds runtime computed
info. To get to the _args part - we can easily use
lvm_command_enum as equivalent index.
Constified part 'struct command_name' is now fully stored
in .data.rel.ro segment, while command_name_args part goes
to .bss segment.
Code will be further reduced with next refactoring.
Refactor code so the definitions may become 'static const'
and with configure_command_option_values() we update options
val_enum for actually running command option when used.
Also update _update_relative_opt() which is used for
generating man pages and command help.
Introduce enumeration for lvm2 commands - so we may
use enum cmd_COMMAND instead of string checking.
So running command now does not modified opt_names.
