Flags for the argp_help Function

When calling argp_help (see section The argp_help Function), or argp_state_help (see section Functions For Use in Argp Parsers), exactly what is output is determined by the flags argument, which should consist of any of the following flags, or'd together:

ARGP_HELP_USAGE

A unix `Usage:' message that explicitly lists all options.

ARGP_HELP_SHORT_USAGE

A unix `Usage:' message that displays only an appropriate placeholder to indicate where the options go; useful for showing the non-option argument syntax.

ARGP_HELP_SEE

A `Try ... for more help' message; `...' contains the program name and `--help'.

ARGP_HELP_LONG

A verbose option help message that gives each option understood along with its documentation string.

ARGP_HELP_PRE_DOC

The part of the argp parser doc string that precedes the verbose option help.

ARGP_HELP_POST_DOC

The part of the argp parser doc string that follows the verbose option help.

ARGP_HELP_DOC

(ARGP_HELP_PRE_DOC | ARGP_HELP_POST_DOC)

ARGP_HELP_BUG_ADDR

A message saying where to report bugs for this program, if the argp_program_bug_address variable contains one.

ARGP_HELP_LONG_ONLY

Modify any output appropriately to reflect ARGP_LONG_ONLY mode.

The following flags are only understood when used with argp_state_help, and control whether the function returns after printing its output, or terminates the program:

ARGP_HELP_EXIT_ERR

Terminate the program with exit (argp_err_exit_status).

ARGP_HELP_EXIT_OK

Terminate the program with exit (0).

The following flags are combinations of the basic ones for printing standard messages:

ARGP_HELP_STD_ERR

Assuming an error message for a parsing error has already printed, prints a note on how to get help, and terminates the program with an error.

ARGP_HELP_STD_USAGE

Prints a standard usage message and terminates the program with an error. This is used when no more specific error message is appropriate.

ARGP_HELP_STD_HELP

Prints the standard response for a `--help' option, and terminates the program successfully.

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