+/**
+ * Control the output of \ref ggo_print_help().
+ *
+ * Any combination of these flags may be passed to ggo_print_help().
+ * Note that the list of supported options is always printed.
+ */
+enum ggo_print_help_flags {
+ /** Whether to print the short help or the detailed help. */
+ GPH_DETAILED = 1 << 0,
+ /** Print the program or module name and the purpose text. */
+ GPH_PRINT_NAME_PURPOSE = 1 << 1,
+ /** Print the synopsis. */
+ GPH_PRINT_USAGE = 1 << 2,
+ /** Print the description text. */
+ GPH_PRINT_DESCRIPTION = 1 << 3,
+};
+
+/** Used to print the normal help of programs (--help) */
+#define GPH_STANDARD_FLAGS \
+ (GPH_PRINT_NAME_PURPOSE | GPH_PRINT_USAGE)
+
+/** Additional information for --detailed-help. */
+#define GPH_STANDARD_FLAGS_DETAILED \
+ (GPH_STANDARD_FLAGS | GPH_DETAILED | GPH_PRINT_DESCRIPTION)
+
+/** For module help embedded in a program help. */
+#define GPH_MODULE_FLAGS 0
+
+/** Modules help with detailed descriptions. */
+#define GPH_MODULE_FLAGS_DETAILED GPH_DETAILED | GPH_PRINT_DESCRIPTION
+
+/** Make a ggo_help structure using information from the .cmdline.h file. */
+#define DEFINE_GGO_HELP(_prefix) \
+ { \
+ .prefix = #_prefix, \
+ .short_help = _prefix ## _args_info_help, \
+ .detailed_help = _prefix ## _args_info_detailed_help, \
+ .purpose = _prefix ## _args_info_purpose, \
+ .usage = _prefix ## _args_info_usage, \
+ .description = _prefix ## _args_info_description, \
+ }
+
+void ggo_print_help(struct ggo_help *help, unsigned flags);
+__printf_1_2 int printf_or_die(const char *fmt, ...);