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debug. Other meaningful options are
warning. The help page consists of four sections, two of which are optional:
opt_help(help(header), String). It is optional.
Usage: <command>is by default
[options]and can be overruled using
opt_help(help(footer), String). It is optional.
The help provided by
either a simple string or a list of elements as defined by
print_message_lines/3. In the latter case, the construct
can be used to call a DCG rule in the module from which the user
calls argv_options/3. For example, we can add a bold title using
opt_help(help(header), [ansi(bold, '~w', ['My title'])]).