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![Ævar Arnfjörð Bjarmason](/assets/img/avatar_default.png)
The "--super-prefix" facility was introduced in [1] has always been a transitory hack, which is why we've made it an error to supply it as an option to "git" to commands that don't know about it. That's been a good goal, as it has a global effect we haven't wanted calls to get_super_prefix() from built-ins we didn't expect. But it has meant that when we've had chains of different built-ins using it all of the processes in that "chain" have needed to support it, and worse processes that don't need it have needed to ask for "SUPPORT_SUPER_PREFIX" because their parent process needs it. That's how "fsmonitor--daemon" ended up with it, per [2] it's called from (among other things) "submodule--helper absorbgitdirs", but as we declared "submodule--helper" as "SUPPORT_SUPER_PREFIX" we needed to declare "fsmonitor--daemon" as accepting it too, even though it doesn't care about it. But in the case of "absorbgitdirs" it only needed "--super-prefix" to invoke itself recursively, and we'd never have another "in-between" process in the chain. So we didn't need the bigger hammer of "git --super-prefix", and the "setenv(GIT_SUPER_PREFIX_ENVIRONMENT, ...)" that it entails. Let's instead accept a hidden "--super-prefix" option to "submodule--helper absorbgitdirs" itself. Eventually (as with all other "--super-prefix" users) we'll want to clean this code up so that this all happens in-process. I.e. needing any variant of "--super-prefix" is itself a hack around our various global state, and implicit reliance on "the_repository". This stepping stone makes such an eventual change easier, as we'll need to deal with less global state at that point. The "fsmonitor--daemon" test adjusted here was added in [3]. To assert that it didn't run into the "--super-prefix" message it was asserting the output it didn't have. Let's instead assert the full output that we *do* have, using the same pattern as a preceding change to "t/t7412-submodule-absorbgitdirs.sh" used. We could also remove the test entirely (as [4] did), but even though the initial reason for having it is gone we're still getting some marginal benefit from testing the "fsmonitor" and "submodule absorbgitdirs" interaction, so let's keep it. The change here to have either a NULL or non-"" string as a "super_prefix" instead of the previous arrangement of "" or non-"" is somewhat arbitrary. We could also decide to never have to check for NULL. As we'll be changing the rest of the "git --super-prefix" users to the same pattern, leaving them all consistent makes sense. Why not pick "" over NULL? Because that's how the "prefix" works[5], and having "prefix" and "super_prefix" work the same way will be less confusing. That "prefix" picked NULL instead of "" is itself arbitrary, but as it's easy to make this small bit of our overall API consistent, let's go with that. 1.74866d7579
(git: make super-prefix option, 2016-10-07) 2.53fcfbc84f
(fsmonitor--daemon: allow --super-prefix argument, 2022-05-26) 3.53fcfbc84f
(fsmonitor--daemon: allow --super-prefix argument, 2022-05-26) 4. https://lore.kernel.org/git/20221109004708.97668-5-chooglen@google.com/ 5.9725c8dda2
(built-ins: trust the "prefix" from run_builtin(), 2022-02-16) Signed-off-by: Glen Choo <chooglen@google.com> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
399 lines
15 KiB
C
399 lines
15 KiB
C
#ifndef PARSE_OPTIONS_H
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#define PARSE_OPTIONS_H
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/**
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* Refer to Documentation/technical/api-parse-options.txt for the API doc.
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*/
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enum parse_opt_type {
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/* special types */
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OPTION_END,
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OPTION_GROUP,
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OPTION_NUMBER,
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OPTION_ALIAS,
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OPTION_SUBCOMMAND,
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/* options with no arguments */
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OPTION_BIT,
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OPTION_NEGBIT,
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OPTION_BITOP,
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OPTION_COUNTUP,
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OPTION_SET_INT,
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/* options with arguments (usually) */
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OPTION_STRING,
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OPTION_INTEGER,
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OPTION_MAGNITUDE,
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OPTION_CALLBACK,
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OPTION_LOWLEVEL_CALLBACK,
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OPTION_FILENAME
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};
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enum parse_opt_flags {
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PARSE_OPT_KEEP_DASHDASH = 1 << 0,
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PARSE_OPT_STOP_AT_NON_OPTION = 1 << 1,
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PARSE_OPT_KEEP_ARGV0 = 1 << 2,
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PARSE_OPT_KEEP_UNKNOWN_OPT = 1 << 3,
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PARSE_OPT_NO_INTERNAL_HELP = 1 << 4,
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PARSE_OPT_ONE_SHOT = 1 << 5,
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PARSE_OPT_SHELL_EVAL = 1 << 6,
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PARSE_OPT_SUBCOMMAND_OPTIONAL = 1 << 7,
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};
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enum parse_opt_option_flags {
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PARSE_OPT_OPTARG = 1 << 0,
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PARSE_OPT_NOARG = 1 << 1,
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PARSE_OPT_NONEG = 1 << 2,
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PARSE_OPT_HIDDEN = 1 << 3,
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PARSE_OPT_LASTARG_DEFAULT = 1 << 4,
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PARSE_OPT_NODASH = 1 << 5,
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PARSE_OPT_LITERAL_ARGHELP = 1 << 6,
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PARSE_OPT_FROM_ALIAS = 1 << 7,
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PARSE_OPT_NOCOMPLETE = 1 << 9,
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PARSE_OPT_COMP_ARG = 1 << 10,
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PARSE_OPT_CMDMODE = 1 << 11,
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};
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enum parse_opt_result {
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PARSE_OPT_COMPLETE = -3,
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PARSE_OPT_HELP = -2,
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PARSE_OPT_ERROR = -1, /* must be the same as error() */
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PARSE_OPT_DONE = 0, /* fixed so that "return 0" works */
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PARSE_OPT_NON_OPTION,
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PARSE_OPT_SUBCOMMAND,
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PARSE_OPT_UNKNOWN
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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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struct parse_opt_ctx_t;
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typedef enum parse_opt_result parse_opt_ll_cb(struct parse_opt_ctx_t *ctx,
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const struct option *opt,
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const char *arg, int unset);
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typedef int parse_opt_subcommand_fn(int argc, const char **argv,
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const char *prefix);
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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 (without the leading dashes) or subcommand name,
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* 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. Does not
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* begin in capital letter, and does not end with a full stop.
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* Should be wrapped by N_() for translation.
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* Is automatically enclosed in brackets when printed, unless it
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* contains any of the following characters: ()<>[]|
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* E.g. "name" is shown as "<name>" to indicate that a name value
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* needs to be supplied, not the literal string "name", but
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* "<start>,<end>" and "(this|that)" are printed verbatim.
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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 and OPTION_SUBCOMMAND).
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* OPTION_GROUP uses this pointer to store the group header.
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* Should be wrapped by N_() for translation.
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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 optional (not for BOOLEANs)
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* PARSE_OPT_NOARG: says that this option does not take an argument
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* PARSE_OPT_NONEG: says that this option cannot be negated
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* PARSE_OPT_HIDDEN: this option is skipped in the default usage, and
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* shown only in the full usage.
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* PARSE_OPT_LASTARG_DEFAULT: says that this option will take the default
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* value if no argument is given when the option
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* is last on the command line. If the option is
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* not last it will require an argument.
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* Should not be used with PARSE_OPT_OPTARG.
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* PARSE_OPT_NODASH: this option doesn't start with a dash; can only be a
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* short option and can't accept arguments.
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* PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets
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* (i.e. '<argh>') in the help message.
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* Useful for options with multiple parameters.
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* PARSE_OPT_NOCOMPLETE: by default all visible options are completable
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* by git-completion.bash. This option suppresses that.
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* PARSE_OPT_COMP_ARG: this option forces to git-completion.bash to
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* complete an option as --name= not --name even if
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* the option takes optional argument.
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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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* OPTION_{BIT,SET_INT} store the {mask,integer} to put in the value when met.
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* CALLBACKS can use it like they want.
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*
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* `ll_callback`::
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* pointer to the callback to use for OPTION_LOWLEVEL_CALLBACK
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*
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* `subcommand_fn`::
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* pointer to a function to use for OPTION_SUBCOMMAND.
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* It will be put in value when the subcommand is given on the command line.
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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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enum parse_opt_option_flags flags;
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parse_opt_cb *callback;
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intptr_t defval;
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parse_opt_ll_cb *ll_callback;
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intptr_t extra;
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parse_opt_subcommand_fn *subcommand_fn;
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};
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#define OPT_BIT_F(s, l, v, h, b, f) { OPTION_BIT, (s), (l), (v), NULL, (h), \
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PARSE_OPT_NOARG|(f), NULL, (b) }
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#define OPT_COUNTUP_F(s, l, v, h, f) { OPTION_COUNTUP, (s), (l), (v), NULL, \
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(h), PARSE_OPT_NOARG|(f) }
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#define OPT_SET_INT_F(s, l, v, h, i, f) { OPTION_SET_INT, (s), (l), (v), NULL, \
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(h), PARSE_OPT_NOARG | (f), NULL, (i) }
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#define OPT_BOOL_F(s, l, v, h, f) OPT_SET_INT_F(s, l, v, h, 1, f)
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#define OPT_CALLBACK_F(s, l, v, a, h, f, cb) \
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{ OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), (cb) }
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#define OPT_STRING_F(s, l, v, a, h, f) { OPTION_STRING, (s), (l), (v), (a), (h), (f) }
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#define OPT_INTEGER_F(s, l, v, h, f) { OPTION_INTEGER, (s), (l), (v), N_("n"), (h), (f) }
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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_BIT(s, l, v, h, b) OPT_BIT_F(s, l, v, h, b, 0)
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#define OPT_BITOP(s, l, v, h, set, clear) { OPTION_BITOP, (s), (l), (v), NULL, (h), \
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PARSE_OPT_NOARG|PARSE_OPT_NONEG, NULL, \
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(set), NULL, (clear) }
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#define OPT_NEGBIT(s, l, v, h, b) { OPTION_NEGBIT, (s), (l), (v), NULL, \
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(h), PARSE_OPT_NOARG, NULL, (b) }
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#define OPT_COUNTUP(s, l, v, h) OPT_COUNTUP_F(s, l, v, h, 0)
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#define OPT_SET_INT(s, l, v, h, i) OPT_SET_INT_F(s, l, v, h, i, 0)
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#define OPT_BOOL(s, l, v, h) OPT_BOOL_F(s, l, v, h, 0)
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#define OPT_HIDDEN_BOOL(s, l, v, h) { OPTION_SET_INT, (s), (l), (v), NULL, \
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(h), PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1}
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#define OPT_CMDMODE_F(s, l, v, h, i, f) { OPTION_SET_INT, (s), (l), (v), NULL, \
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(h), PARSE_OPT_CMDMODE|PARSE_OPT_NOARG|PARSE_OPT_NONEG | (f), NULL, (i) }
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#define OPT_CMDMODE(s, l, v, h, i) OPT_CMDMODE_F(s, l, v, h, i, 0)
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#define OPT_INTEGER(s, l, v, h) OPT_INTEGER_F(s, l, v, h, 0)
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#define OPT_MAGNITUDE(s, l, v, h) { OPTION_MAGNITUDE, (s), (l), (v), \
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N_("n"), (h), PARSE_OPT_NONEG }
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#define OPT_STRING(s, l, v, a, h) OPT_STRING_F(s, l, v, a, h, 0)
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#define OPT_STRING_LIST(s, l, v, a, h) \
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{ OPTION_CALLBACK, (s), (l), (v), (a), \
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(h), 0, &parse_opt_string_list }
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#define OPT_UYN(s, l, v, h) { OPTION_CALLBACK, (s), (l), (v), NULL, \
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(h), PARSE_OPT_NOARG, &parse_opt_tertiary }
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#define OPT_EXPIRY_DATE(s, l, v, h) \
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{ OPTION_CALLBACK, (s), (l), (v), N_("expiry-date"),(h), 0, \
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parse_opt_expiry_date_cb }
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#define OPT_CALLBACK(s, l, v, a, h, f) OPT_CALLBACK_F(s, l, v, a, h, 0, f)
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#define OPT_NUMBER_CALLBACK(v, h, f) \
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{ OPTION_NUMBER, 0, NULL, (v), NULL, (h), \
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PARSE_OPT_NOARG | PARSE_OPT_NONEG, (f) }
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#define OPT_FILENAME(s, l, v, h) { OPTION_FILENAME, (s), (l), (v), \
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N_("file"), (h) }
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#define OPT_COLOR_FLAG(s, l, v, h) \
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{ OPTION_CALLBACK, (s), (l), (v), N_("when"), (h), PARSE_OPT_OPTARG, \
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parse_opt_color_flag_cb, (intptr_t)"always" }
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#define OPT_NOOP_NOARG(s, l) \
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{ OPTION_CALLBACK, (s), (l), NULL, NULL, \
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N_("no-op (backward compatibility)"), \
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PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, parse_opt_noop_cb }
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#define OPT_ALIAS(s, l, source_long_name) \
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{ OPTION_ALIAS, (s), (l), (source_long_name) }
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#define OPT_SUBCOMMAND_F(l, v, fn, f) { \
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.type = OPTION_SUBCOMMAND, \
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.long_name = (l), \
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.value = (v), \
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.flags = (f), \
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.subcommand_fn = (fn) }
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#define OPT_SUBCOMMAND(l, v, fn) OPT_SUBCOMMAND_F((l), (v), (fn), 0)
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/*
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* parse_options() will filter out the processed options and leave the
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* non-option arguments in argv[]. argv0 is assumed program name and
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* skipped.
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*
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* usagestr strings should be marked for translation with N_().
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*
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* Returns the number of arguments left in argv[].
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*
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* In one-shot mode, argv0 is not a program name, argv[] is left
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* untouched and parse_options() returns the number of options
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* processed.
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*/
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int parse_options(int argc, const char **argv, const char *prefix,
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const struct option *options,
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const char * const usagestr[],
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enum parse_opt_flags flags);
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NORETURN void usage_with_options(const char * const *usagestr,
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const struct option *options);
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NORETURN void usage_msg_opt(const char *msg,
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const char * const *usagestr,
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const struct option *options);
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/**
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* usage_msg_optf() is like usage_msg_opt() except that the first
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* argument is a format string, and optional format arguments follow
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* after the 3rd option.
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*/
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__attribute__((format (printf,1,4)))
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void NORETURN usage_msg_optf(const char *fmt,
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const char * const *usagestr,
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const struct option *options, ...);
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void die_for_incompatible_opt4(int opt1, const char *opt1_name,
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int opt2, const char *opt2_name,
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int opt3, const char *opt3_name,
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int opt4, const char *opt4_name);
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static inline void die_for_incompatible_opt3(int opt1, const char *opt1_name,
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int opt2, const char *opt2_name,
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int opt3, const char *opt3_name)
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{
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die_for_incompatible_opt4(opt1, opt1_name,
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opt2, opt2_name,
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opt3, opt3_name,
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0, "");
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}
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/*
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* Use these assertions for callbacks that expect to be called with NONEG and
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* NOARG respectively, and do not otherwise handle the "unset" and "arg"
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* parameters.
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*/
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#define BUG_ON_OPT_NEG(unset) do { \
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if ((unset)) \
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BUG("option callback does not expect negation"); \
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} while (0)
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#define BUG_ON_OPT_ARG(arg) do { \
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if ((arg)) \
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BUG("option callback does not expect an argument"); \
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} while (0)
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/*
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* Similar to the assertions above, but checks that "arg" is always non-NULL.
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* This assertion also implies BUG_ON_OPT_NEG(), letting you declare both
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* assertions in a single line.
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*/
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#define BUG_ON_OPT_NEG_NOARG(unset, arg) do { \
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BUG_ON_OPT_NEG(unset); \
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if(!(arg)) \
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BUG("option callback expects an argument"); \
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} while(0)
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/*----- incremental advanced APIs -----*/
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/*
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* It's okay for the caller to consume argv/argc in the usual way.
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* Other fields of that structure are private to parse-options and should not
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* be modified in any way.
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*/
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struct parse_opt_ctx_t {
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const char **argv;
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const char **out;
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int argc, cpidx, total;
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const char *opt;
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enum parse_opt_flags flags;
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unsigned has_subcommands;
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const char *prefix;
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const char **alias_groups; /* must be in groups of 3 elements! */
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struct option *updated_options;
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};
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void parse_options_start(struct parse_opt_ctx_t *ctx,
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int argc, const char **argv, const char *prefix,
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const struct option *options,
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enum parse_opt_flags flags);
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enum parse_opt_result parse_options_step(struct parse_opt_ctx_t *ctx,
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const struct option *options,
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const char * const usagestr[]);
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int parse_options_end(struct parse_opt_ctx_t *ctx);
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struct option *parse_options_dup(const struct option *a);
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struct option *parse_options_concat(const struct option *a, const struct option *b);
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/*----- some often used options -----*/
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int parse_opt_abbrev_cb(const struct option *, const char *, int);
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int parse_opt_expiry_date_cb(const struct option *, const char *, int);
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int parse_opt_color_flag_cb(const struct option *, const char *, int);
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int parse_opt_verbosity_cb(const struct option *, const char *, int);
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/* value is struct oid_array* */
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int parse_opt_object_name(const struct option *, const char *, int);
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/* value is struct object_id* */
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int parse_opt_object_id(const struct option *, const char *, int);
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int parse_opt_commits(const struct option *, const char *, int);
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int parse_opt_commit(const struct option *, const char *, int);
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int parse_opt_tertiary(const struct option *, const char *, int);
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int parse_opt_string_list(const struct option *, const char *, int);
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int parse_opt_noop_cb(const struct option *, const char *, int);
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enum parse_opt_result parse_opt_unknown_cb(struct parse_opt_ctx_t *ctx,
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const struct option *,
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const char *, int);
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int parse_opt_passthru(const struct option *, const char *, int);
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int parse_opt_passthru_argv(const struct option *, const char *, int);
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/* value is enum branch_track* */
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int parse_opt_tracking_mode(const struct option *, const char *, int);
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#define OPT__VERBOSE(var, h) OPT_COUNTUP('v', "verbose", (var), (h))
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#define OPT__QUIET(var, h) OPT_COUNTUP('q', "quiet", (var), (h))
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#define OPT__VERBOSITY(var) \
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{ OPTION_CALLBACK, 'v', "verbose", (var), NULL, N_("be more verbose"), \
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PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
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{ OPTION_CALLBACK, 'q', "quiet", (var), NULL, N_("be more quiet"), \
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PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
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#define OPT__DRY_RUN(var, h) OPT_BOOL('n', "dry-run", (var), (h))
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#define OPT__FORCE(var, h, f) OPT_COUNTUP_F('f', "force", (var), (h), (f))
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#define OPT__ABBREV(var) \
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{ OPTION_CALLBACK, 0, "abbrev", (var), N_("n"), \
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N_("use <n> digits to display object names"), \
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PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
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#define OPT__SUPER_PREFIX(var) \
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OPT_STRING_F(0, "super-prefix", (var), N_("prefix"), \
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N_("prefixed path to initial superproject"), PARSE_OPT_HIDDEN)
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#define OPT__COLOR(var, h) \
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OPT_COLOR_FLAG(0, "color", (var), (h))
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#define OPT_COLUMN(s, l, v, h) \
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{ OPTION_CALLBACK, (s), (l), (v), N_("style"), (h), PARSE_OPT_OPTARG, parseopt_column_callback }
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#define OPT_PASSTHRU(s, l, v, a, h, f) \
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{ OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru }
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#define OPT_PASSTHRU_ARGV(s, l, v, a, h, f) \
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{ OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru_argv }
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#define _OPT_CONTAINS_OR_WITH(name, variable, help, flag) \
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{ OPTION_CALLBACK, 0, name, (variable), N_("commit"), (help), \
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PARSE_OPT_LASTARG_DEFAULT | flag, \
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parse_opt_commits, (intptr_t) "HEAD" \
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}
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#define OPT_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("contains", v, h, PARSE_OPT_NONEG)
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#define OPT_NO_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("no-contains", v, h, PARSE_OPT_NONEG)
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#define OPT_WITH(v, h) _OPT_CONTAINS_OR_WITH("with", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
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#define OPT_WITHOUT(v, h) _OPT_CONTAINS_OR_WITH("without", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
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#define OPT_CLEANUP(v) OPT_STRING(0, "cleanup", v, N_("mode"), N_("how to strip spaces and #comments from message"))
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#define OPT_PATHSPEC_FROM_FILE(v) OPT_FILENAME(0, "pathspec-from-file", v, N_("read pathspec from file"))
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#define OPT_PATHSPEC_FILE_NUL(v) OPT_BOOL(0, "pathspec-file-nul", v, N_("with --pathspec-from-file, pathspec elements are separated with NUL character"))
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#define OPT_AUTOSTASH(v) OPT_BOOL(0, "autostash", v, N_("automatically stash/stash pop before and after"))
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#endif
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