Normally programs using argp need not be written with particular
printing argument-usage-type help messages in mind as the standard
`--help' option is handled automatically by argp. Typical error
cases can be handled using argp_usage and
argp_error. See Argp Helper Functions. However, if it's
desirable to print a help message in some context other than parsing the
program options, argp offers the argp_help interface.
This outputs a help message for the argp parser argp to
stream. The type of messages printed will be determined by
flags.
Any options such as `--help' that are implemented automatically by
argp itself will not be present in the help output; for this
reason it is best to use argp_state_help if calling from within
an argp parser function. See Argp Helper Functions.
Flags: Specifying what sort of help message to print.
Published under the terms of the GNU General Public License
