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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.
Move part of the 'inner' loop which is would be otherwise
always production same results for all 'opt_enum' values
out of the loop, so it can be evaluated just once.
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 to not allocate memory for rule->opts,
instead use uint16_t array of MAX_RULE_OPTS within cmd_rule.
Also print more info if array would not be enough (>= 8).
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.
Move memset() to the initialization function define_commands().
There is also not much point in clearing memory on command's exit
so drop zeroing of ~2M of RAM.
Use \0 as EOL in compiled-in syntax description to avoid
unnecessary line copy that just replaced \n with \0.
Also use already splitted lines when possible.
Reuse existing report/headings config setting to make it possible to
change the type of headings to display:
0 - no headings
1 - column name abbreviations (default and original functionality)
2 - full column names (column names are equal to exact names that
-o|--options also accepts to set report output)
Also, add '--headings none|abbrev|full|0|1|2' command line option
so we are able to select the heading type for each LVM reporting
command directly.
