nft: rearrange help output to group related options together

It has been reported that nft options are a bit chaotic. With a growing list of options for the nft
CLI, we can do better when presenting them to the user who requests help.

This patch introduces a textual output grouping for options, in 4 groups:
  * Options (general)     -- common Unix utility options
  * Options (operative)   -- the options that modify the operative behaviour of nft
  * Options (translation) -- output text modifiers for data translation
  * Options (parsing)     -- output text modifiers for parsing and other operations

There is no behavior change in this patch, is mostly a cosmetic change in the hope that users will
find the nft tool a bit less confusing to use.

After this patch, the help output is:

=== 8< ===
% nft --help
Usage: nft [ options ] [ cmds... ]

Options (general):
  -h, help                      Show this help
  -v, version                   Show version information
  -V                            Show extended version information

Options (ruleset input handling):
  -f, file <filename>           Read input from <filename>
  -i, interactive               Read input from interactive CLI
  -I, includepath <directory>   Add <directory> to the paths searched for include files. Defaul[..]
  -c, check                     Check commands validity without actually applying the changes.

Options (ruleset list formatting):
  -a, handle                    Output rule handle.
  -s, stateless                 Omit stateful information of ruleset.
  -t, terse                     Omit contents of sets.
  -S, service                   Translate ports to service names as described in /etc/services.
  -N, reversedns                Translate IP addresses to names.
  -u, guid                      Print UID/GID as defined in /etc/passwd and /etc/group.
  -n, numeric                   Print fully numerical output.
  -y, numeric-priority          Print chain priority numerically.
  -p, numeric-protocol          Print layer 4 protocols numerically.
  -T, numeric-time              Print time values numerically.

Options (command output format):
  -e, echo                      Echo what has been added, inserted or replaced.
  -j, json                      Format output in JSON
  -d, debug <level [,level...]> Specify debugging level (scanner, parser, eval, netlink, mnl, p[..]
=== 8< ===

While at it, refresh the man page to better reflex this new grouping, and add some missing options.

Joint work with Pablo.

Signed-off-by: Arturo Borrero Gonzalez <arturo@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

0 files changed, 0 insertions, 0 deletions