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104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
#ifndef PARSE_OPTIONS_H
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#define PARSE_OPTIONS_H
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enum parse_opt_type {
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OPTION_END,
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OPTION_GROUP,
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OPTION_BOOLEAN,
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OPTION_STRING,
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OPTION_INTEGER,
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OPTION_CALLBACK,
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};
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enum parse_opt_flags {
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PARSE_OPT_KEEP_DASHDASH = 1,
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};
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enum parse_opt_option_flags {
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PARSE_OPT_OPTARG = 1,
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PARSE_OPT_NOARG = 2,
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};
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struct option;
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typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
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/*
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* `type`::
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* holds the type of the option, you must have an OPTION_END last in your
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* array.
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*
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* `short_name`::
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* the character to use as a short option name, '\0' if none.
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*
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* `long_name`::
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* the long option name, without the leading dashes, NULL if none.
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*
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* `value`::
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* stores pointers to the values to be filled.
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*
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* `argh`::
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* token to explain the kind of argument this option wants. Keep it
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* homogenous across the repository.
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*
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* `help`::
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* the short help associated to what the option does.
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* Must never be NULL (except for OPTION_END).
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* OPTION_GROUP uses this pointer to store the group header.
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*
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* `flags`::
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* mask of parse_opt_option_flags.
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* PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs)
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* PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
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*
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* `callback`::
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* pointer to the callback to use for OPTION_CALLBACK.
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*
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* `defval`::
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* default value to fill (*->value) with for PARSE_OPT_OPTARG.
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* CALLBACKS can use it like they want.
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*/
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struct option {
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enum parse_opt_type type;
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int short_name;
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const char *long_name;
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void *value;
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const char *argh;
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const char *help;
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int flags;
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parse_opt_cb *callback;
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intptr_t defval;
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};
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#define OPT_END() { OPTION_END }
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#define OPT_GROUP(h) { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
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#define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) }
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#define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), NULL, (h) }
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#define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v), (a), (h) }
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#define OPT_CALLBACK(s, l, v, a, h, f) \
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{ OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
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/* parse_options() will filter out the processed options and leave the
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* non-option argments in argv[].
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* Returns the number of arguments left in argv[].
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*/
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extern int parse_options(int argc, const char **argv,
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const struct option *options,
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const char * const usagestr[], int flags);
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extern NORETURN void usage_with_options(const char * const *usagestr,
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const struct option *options);
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/*----- some often used options -----*/
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extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
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#define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose")
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#define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet")
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#define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run")
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#define OPT__ABBREV(var) \
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{ OPTION_CALLBACK, 0, "abbrev", (var), "n", \
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"use <n> digits to display SHA-1s", \
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PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
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#endif
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