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git/parse-options.h
Junio C Hamano b72e90712e Merge branch 'js/difftool-no-index' 
"git difftool" can now run outside a repository.

* js/difftool-no-index:
  difftool: allow running outside Git worktrees with --no-index
  parse-options: make OPT_ARGUMENT() more useful
  difftool: remove obsolete (and misleading) comment
2019-04-25 16:41:14 +09:00

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#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_BITOP,
OPTION_COUNTUP,
OPTION_SET_INT,
OPTION_CMDMODE,
/* options with arguments (usually) */
OPTION_STRING,
OPTION_INTEGER,
OPTION_MAGNITUDE,
OPTION_CALLBACK,
OPTION_LOWLEVEL_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,
PARSE_OPT_ONE_SHOT = 32
};
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_SHELL_EVAL = 256,
PARSE_OPT_NOCOMPLETE = 512,
PARSE_OPT_COMP_ARG = 1024
};
struct option;
typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
struct parse_opt_ctx_t;
typedef enum parse_opt_result parse_opt_ll_cb(struct parse_opt_ctx_t *ctx,
const struct option *opt,
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. Should be wrapped by N_() for
* translation.
*
* `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.
* Should be wrapped by N_() for translation.
*
* `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 does not take an 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_NOCOMPLETE: by default all visible options are completable
* by git-completion.bash. This option suppresses that.
* PARSE_OPT_COMP_ARG: this option forces to git-completion.bash to
* complete an option as --name= not --name even if
* the option takes optional argument.
*
* `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} store the {mask,integer} to put in the value when met.
* CALLBACKS can use it like they want.
*
* `ll_callback`::
* pointer to the callback to use for OPTION_LOWLEVEL_CALLBACK
*
*/
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;
parse_opt_ll_cb *ll_callback;
intptr_t extra;
};
#define OPT_BIT_F(s, l, v, h, b, f) { OPTION_BIT, (s), (l), (v), NULL, (h), \
PARSE_OPT_NOARG|(f), NULL, (b) }
#define OPT_COUNTUP_F(s, l, v, h, f) { OPTION_COUNTUP, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG|(f) }
#define OPT_SET_INT_F(s, l, v, h, i, f) { OPTION_SET_INT, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG | (f), NULL, (i) }
#define OPT_BOOL_F(s, l, v, h, f) OPT_SET_INT_F(s, l, v, h, 1, f)
#define OPT_CALLBACK_F(s, l, v, a, h, f, cb) \
{ OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), (cb) }
#define OPT_STRING_F(s, l, v, a, h, f) { OPTION_STRING, (s), (l), (v), (a), (h), (f) }
#define OPT_INTEGER_F(s, l, v, h, f) { OPTION_INTEGER, (s), (l), (v), N_("n"), (h), (f) }
#define OPT_END() { OPTION_END }
#define OPT_ARGUMENT(l, v, h) { OPTION_ARGUMENT, 0, (l), (v), NULL, \
(h), PARSE_OPT_NOARG, NULL, 1 }
#define OPT_GROUP(h) { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
#define OPT_BIT(s, l, v, h, b) OPT_BIT_F(s, l, v, h, b, 0)
#define OPT_BITOP(s, l, v, h, set, clear) { OPTION_BITOP, (s), (l), (v), NULL, (h), \
PARSE_OPT_NOARG|PARSE_OPT_NONEG, NULL, \
(set), NULL, (clear) }
#define OPT_NEGBIT(s, l, v, h, b) { OPTION_NEGBIT, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG, NULL, (b) }
#define OPT_COUNTUP(s, l, v, h) OPT_COUNTUP_F(s, l, v, h, 0)
#define OPT_SET_INT(s, l, v, h, i) OPT_SET_INT_F(s, l, v, h, i, 0)
#define OPT_BOOL(s, l, v, h) OPT_BOOL_F(s, l, v, h, 0)
#define OPT_HIDDEN_BOOL(s, l, v, h) { OPTION_SET_INT, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1}
#define OPT_CMDMODE(s, l, v, h, i) { OPTION_CMDMODE, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG|PARSE_OPT_NONEG, NULL, (i) }
#define OPT_INTEGER(s, l, v, h) OPT_INTEGER_F(s, l, v, h, 0)
#define OPT_MAGNITUDE(s, l, v, h) { OPTION_MAGNITUDE, (s), (l), (v), \
N_("n"), (h), PARSE_OPT_NONEG }
#define OPT_STRING(s, l, v, a, h) OPT_STRING_F(s, l, v, a, h, 0)
#define OPT_STRING_LIST(s, l, v, a, h) \
{ OPTION_CALLBACK, (s), (l), (v), (a), \
(h), 0, &parse_opt_string_list }
#define OPT_UYN(s, l, v, h) { OPTION_CALLBACK, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG, &parse_opt_tertiary }
#define OPT_EXPIRY_DATE(s, l, v, h) \
{ OPTION_CALLBACK, (s), (l), (v), N_("expiry-date"),(h), 0, \
parse_opt_expiry_date_cb }
#define OPT_CALLBACK(s, l, v, a, h, f) OPT_CALLBACK_F(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), \
N_("file"), (h) }
#define OPT_COLOR_FLAG(s, l, v, h) \
{ OPTION_CALLBACK, (s), (l), (v), N_("when"), (h), PARSE_OPT_OPTARG, \
parse_opt_color_flag_cb, (intptr_t)"always" }
#define OPT_NOOP_NOARG(s, l) \
{ OPTION_CALLBACK, (s), (l), NULL, NULL, \
N_("no-op (backward compatibility)"), \
PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, parse_opt_noop_cb }
/*
* parse_options() will filter out the processed options and leave the
* non-option arguments in argv[]. argv0 is assumed program name and
* skipped.
*
* usagestr strings should be marked for translation with N_().
*
* Returns the number of arguments left in argv[].
*
* In one-shot mode, argv0 is not a program name, argv[] is left
* untouched and parse_options() returns the number of options
* processed.
*/
int parse_options(int argc, const char **argv, const char *prefix,
const struct option *options,
const char * const usagestr[], int flags);
NORETURN void usage_with_options(const char * const *usagestr,
const struct option *options);
NORETURN void usage_msg_opt(const char *msg,
const char * const *usagestr,
const struct option *options);
int optbug(const struct option *opt, const char *reason);
const char *optname(const struct option *opt, int flags);
/*
* Use these assertions for callbacks that expect to be called with NONEG and
* NOARG respectively, and do not otherwise handle the "unset" and "arg"
* parameters.
*/
#define BUG_ON_OPT_NEG(unset) do { \
if ((unset)) \
BUG("option callback does not expect negation"); \
} while (0)
#define BUG_ON_OPT_ARG(arg) do { \
if ((arg)) \
BUG("option callback does not expect an argument"); \
} while (0)
/*
* Similar to the assertions above, but checks that "arg" is always non-NULL.
* This assertion also implies BUG_ON_OPT_NEG(), letting you declare both
* assertions in a single line.
*/
#define BUG_ON_OPT_NEG_NOARG(unset, arg) do { \
BUG_ON_OPT_NEG(unset); \
if(!(arg)) \
BUG("option callback expects an argument"); \
} while(0)
/*----- incremental advanced APIs -----*/
enum parse_opt_result {
PARSE_OPT_COMPLETE = -3,
PARSE_OPT_HELP = -2,
PARSE_OPT_ERROR = -1, /* must be the same as error() */
PARSE_OPT_DONE = 0, /* fixed so that "return 0" works */
PARSE_OPT_NON_OPTION,
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, total;
const char *opt;
int flags;
const char *prefix;
};
void parse_options_start(struct parse_opt_ctx_t *ctx,
int argc, const char **argv, const char *prefix,
const struct option *options, int flags);
int parse_options_step(struct parse_opt_ctx_t *ctx,
const struct option *options,
const char * const usagestr[]);
int parse_options_end(struct parse_opt_ctx_t *ctx);
struct option *parse_options_concat(struct option *a, struct option *b);
/*----- some often used options -----*/
int parse_opt_abbrev_cb(const struct option *, const char *, int);
int parse_opt_expiry_date_cb(const struct option *, const char *, int);
int parse_opt_color_flag_cb(const struct option *, const char *, int);
int parse_opt_verbosity_cb(const struct option *, const char *, int);
int parse_opt_object_name(const struct option *, const char *, int);
int parse_opt_commits(const struct option *, const char *, int);
int parse_opt_tertiary(const struct option *, const char *, int);
int parse_opt_string_list(const struct option *, const char *, int);
int parse_opt_noop_cb(const struct option *, const char *, int);
int parse_opt_unknown_cb(struct parse_opt_ctx_t *ctx, const struct option *, const char *, int);
int parse_opt_passthru(const struct option *, const char *, int);
int parse_opt_passthru_argv(const struct option *, const char *, int);
#define OPT__VERBOSE(var, h) OPT_COUNTUP('v', "verbose", (var), (h))
#define OPT__QUIET(var, h) OPT_COUNTUP('q', "quiet", (var), (h))
#define OPT__VERBOSITY(var) \
{ OPTION_CALLBACK, 'v', "verbose", (var), NULL, N_("be more verbose"), \
PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
{ OPTION_CALLBACK, 'q', "quiet", (var), NULL, N_("be more quiet"), \
PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
#define OPT__DRY_RUN(var, h) OPT_BOOL('n', "dry-run", (var), (h))
#define OPT__FORCE(var, h, f) OPT_COUNTUP_F('f', "force", (var), (h), (f))
#define OPT__ABBREV(var) \
{ OPTION_CALLBACK, 0, "abbrev", (var), N_("n"), \
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))
#define OPT_COLUMN(s, l, v, h) \
{ OPTION_CALLBACK, (s), (l), (v), N_("style"), (h), PARSE_OPT_OPTARG, parseopt_column_callback }
#define OPT_PASSTHRU(s, l, v, a, h, f) \
{ OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru }
#define OPT_PASSTHRU_ARGV(s, l, v, a, h, f) \
{ OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru_argv }
#define _OPT_CONTAINS_OR_WITH(name, variable, help, flag) \
{ OPTION_CALLBACK, 0, name, (variable), N_("commit"), (help), \
PARSE_OPT_LASTARG_DEFAULT | flag, \
parse_opt_commits, (intptr_t) "HEAD" \
}
#define OPT_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("contains", v, h, PARSE_OPT_NONEG)
#define OPT_NO_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("no-contains", v, h, PARSE_OPT_NONEG)
#define OPT_WITH(v, h) _OPT_CONTAINS_OR_WITH("with", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
#define OPT_WITHOUT(v, h) _OPT_CONTAINS_OR_WITH("without", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
#endif
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