diff options
Diffstat (limited to 'parse-options.h')
| -rw-r--r-- | parse-options.h | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/parse-options.h b/parse-options.h new file mode 100644 index 0000000000..7581e931da --- /dev/null +++ b/parse-options.h @@ -0,0 +1,215 @@ +#ifndef PARSE_OPTIONS_H +#define PARSE_OPTIONS_H + +enum parse_opt_type { + /* special types */ + OPTION_END, + OPTION_ARGUMENT, + OPTION_GROUP, + OPTION_NUMBER, + /* options with no arguments */ + OPTION_BIT, + OPTION_NEGBIT, + OPTION_BOOLEAN, /* _INCR would have been a better name */ + OPTION_SET_INT, + OPTION_SET_PTR, + /* options with arguments (usually) */ + OPTION_STRING, + OPTION_INTEGER, + OPTION_CALLBACK, + OPTION_FILENAME +}; + +enum parse_opt_flags { + PARSE_OPT_KEEP_DASHDASH = 1, + PARSE_OPT_STOP_AT_NON_OPTION = 2, + PARSE_OPT_KEEP_ARGV0 = 4, + PARSE_OPT_KEEP_UNKNOWN = 8, + PARSE_OPT_NO_INTERNAL_HELP = 16, +}; + +enum parse_opt_option_flags { + PARSE_OPT_OPTARG = 1, + PARSE_OPT_NOARG = 2, + PARSE_OPT_NONEG = 4, + PARSE_OPT_HIDDEN = 8, + PARSE_OPT_LASTARG_DEFAULT = 16, + PARSE_OPT_NODASH = 32, + PARSE_OPT_LITERAL_ARGHELP = 64, + PARSE_OPT_NEGHELP = 128, +}; + +struct option; +typedef int parse_opt_cb(const struct option *, const char *arg, int unset); + +/* + * `type`:: + * holds the type of the option, you must have an OPTION_END last in your + * array. + * + * `short_name`:: + * the character to use as a short option name, '\0' if none. + * + * `long_name`:: + * the long option name, without the leading dashes, NULL if none. + * + * `value`:: + * stores pointers to the values to be filled. + * + * `argh`:: + * token to explain the kind of argument this option wants. Keep it + * homogeneous across the repository. + * + * `help`:: + * the short help associated to what the option does. + * Must never be NULL (except for OPTION_END). + * OPTION_GROUP uses this pointer to store the group header. + * + * `flags`:: + * mask of parse_opt_option_flags. + * PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs) + * PARSE_OPT_NOARG: says that this option takes no argument + * PARSE_OPT_NONEG: says that this option cannot be negated + * PARSE_OPT_HIDDEN: this option is skipped in the default usage, and + * shown only in the full usage. + * PARSE_OPT_LASTARG_DEFAULT: says that this option will take the default + * value if no argument is given when the option + * is last on the command line. If the option is + * not last it will require an argument. + * Should not be used with PARSE_OPT_OPTARG. + * PARSE_OPT_NODASH: this option doesn't start with a dash. + * PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets + * (i.e. '<argh>') in the help message. + * Useful for options with multiple parameters. + * PARSE_OPT_NEGHELP: says that the long option should always be shown with + * the --no prefix in the usage message. Sometimes + * useful for users of OPTION_NEGBIT. + * + * `callback`:: + * pointer to the callback to use for OPTION_CALLBACK. + * + * `defval`:: + * default value to fill (*->value) with for PARSE_OPT_OPTARG. + * OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in + * the value when met. + * CALLBACKS can use it like they want. + */ +struct option { + enum parse_opt_type type; + int short_name; + const char *long_name; + void *value; + const char *argh; + const char *help; + + int flags; + parse_opt_cb *callback; + intptr_t defval; +}; + +#define OPT_END() { OPTION_END } +#define OPT_ARGUMENT(l, h) { OPTION_ARGUMENT, 0, (l), NULL, NULL, \ + (h), PARSE_OPT_NOARG} +#define OPT_GROUP(h) { OPTION_GROUP, 0, NULL, NULL, NULL, (h) } +#define OPT_BIT(s, l, v, h, b) { OPTION_BIT, (s), (l), (v), NULL, (h), \ + PARSE_OPT_NOARG, NULL, (b) } +#define OPT_NEGBIT(s, l, v, h, b) { OPTION_NEGBIT, (s), (l), (v), NULL, \ + (h), PARSE_OPT_NOARG, NULL, (b) } +#define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, \ + (h), PARSE_OPT_NOARG } +#define OPT_SET_INT(s, l, v, h, i) { OPTION_SET_INT, (s), (l), (v), NULL, \ + (h), PARSE_OPT_NOARG, NULL, (i) } +#define OPT_SET_PTR(s, l, v, h, p) { OPTION_SET_PTR, (s), (l), (v), NULL, \ + (h), PARSE_OPT_NOARG, NULL, (p) } +#define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), "n", (h) } +#define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v), (a), (h) } +#define OPT_UYN(s, l, v, h) { OPTION_CALLBACK, (s), (l), (v), NULL, \ + (h), PARSE_OPT_NOARG, &parse_opt_tertiary } +#define OPT_DATE(s, l, v, h) \ + { OPTION_CALLBACK, (s), (l), (v), "time",(h), 0, \ + parse_opt_approxidate_cb } +#define OPT_CALLBACK(s, l, v, a, h, f) \ + { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) } +#define OPT_NUMBER_CALLBACK(v, h, f) \ + { OPTION_NUMBER, 0, NULL, (v), NULL, (h), \ + PARSE_OPT_NOARG | PARSE_OPT_NONEG, (f) } +#define OPT_FILENAME(s, l, v, h) { OPTION_FILENAME, (s), (l), (v), \ + "FILE", (h) } +#define OPT_COLOR_FLAG(s, l, v, h) \ + { OPTION_CALLBACK, (s), (l), (v), "when", (h), PARSE_OPT_OPTARG, \ + parse_opt_color_flag_cb, (intptr_t)"always" } + + +/* parse_options() will filter out the processed options and leave the + * non-option arguments in argv[]. + * Returns the number of arguments left in argv[]. + */ +extern int parse_options(int argc, const char **argv, const char *prefix, + const struct option *options, + const char * const usagestr[], int flags); + +extern NORETURN void usage_with_options(const char * const *usagestr, + const struct option *options); + +extern NORETURN void usage_msg_opt(const char *msg, + const char * const *usagestr, + const struct option *options); + +/*----- incremental advanced APIs -----*/ + +enum { + PARSE_OPT_HELP = -1, + PARSE_OPT_DONE, + PARSE_OPT_UNKNOWN, +}; + +/* + * It's okay for the caller to consume argv/argc in the usual way. + * Other fields of that structure are private to parse-options and should not + * be modified in any way. + */ +struct parse_opt_ctx_t { + const char **argv; + const char **out; + int argc, cpidx; + const char *opt; + int flags; + const char *prefix; +}; + +extern void parse_options_start(struct parse_opt_ctx_t *ctx, + int argc, const char **argv, const char *prefix, + int flags); + +extern int parse_options_step(struct parse_opt_ctx_t *ctx, + const struct option *options, + const char * const usagestr[]); + +extern int parse_options_end(struct parse_opt_ctx_t *ctx); + +extern int parse_options_concat(struct option *dst, size_t, struct option *src); + +/*----- some often used options -----*/ +extern int parse_opt_abbrev_cb(const struct option *, const char *, int); +extern int parse_opt_approxidate_cb(const struct option *, const char *, int); +extern int parse_opt_color_flag_cb(const struct option *, const char *, int); +extern int parse_opt_verbosity_cb(const struct option *, const char *, int); +extern int parse_opt_with_commit(const struct option *, const char *, int); +extern int parse_opt_tertiary(const struct option *, const char *, int); + +#define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose") +#define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet") +#define OPT__VERBOSITY(var) \ + { OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \ + PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \ + { OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \ + PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 } +#define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run") +#define OPT__ABBREV(var) \ + { OPTION_CALLBACK, 0, "abbrev", (var), "n", \ + "use <n> digits to display SHA-1s", \ + PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 } +#define OPT__COLOR(var, h) \ + OPT_COLOR_FLAG(0, "color", (var), (h)) + +#endif |