help_format
enum help_format *help_formatp = cb;
static enum help_format parse_help_format(const char *format)
enum help_format help_format = HELP_FORMAT_MAN;
OPT_SET_UINT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
OPT_SET_UINT('w', "web", &help_format, "show manual in web browser",
OPT_SET_UINT('i', "info", &help_format, "show info page",
rc = perf_config(perf_help_config, &help_format);
switch (help_format) {