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git/parse-options.c
Ævar Arnfjörð Bjarmason 4631cfc20b parse-options: properly align continued usage output 
Some commands such as "git stash" emit continued options output with
e.g. "git stash -h", because usage_with_options_internal() prefixes
with its own whitespace the resulting output wasn't properly
aligned. Let's account for the added whitespace, which properly aligns
the output.

The "git stash" command has usage output with a N_() translation that
legitimately stretches across multiple lines;

	N_("git stash [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
	   "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
           [...]

We'd like to have that output aligned with the length of the initial
"git stash " output, but since usage_with_options_internal() adds its
own whitespace prefixing we fell short, before this change we'd emit:

    $ git stash -h
    usage: git stash list [<options>]
       or: git stash show [<options>] [<stash>]
       [...]
       or: git stash [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]
              [-u|--include-untracked] [-a|--all] [-m|--message <message>]
              [...]

Now we'll properly emit aligned output.  I.e. the last four lines
above will instead be (a whitespace-only change to the above):

       [...]
       or: git stash [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]
                     [-u|--include-untracked] [-a|--all] [-m|--message <message>]
                     [...]

We could also go for an approach where we have the caller support no
padding of their own, i.e. (same as the first example, except for the
padding on the second line):

	N_("git stash [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
	   "[-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
           [...]

But to do that we'll need to find the length of "git stash". We can
discover that from the "cmd" in the "struct cmd_struct", but there
might be cases with sub-commands or "git" itself taking arguments that
would make that non-trivial.

Even if it were I still think this approach is better, because this way
we'll get the same legible alignment in the C code. The fact that
usage_with_options_internal() is adding its own prefix padding is an
implementation detail that callers shouldn't need to worry about.

Implementation notes:

We could skip the string_list_split() with a strchr(str, '\n') check,
but we'd then need to duplicate our state machine for strings that do
and don't contain a "\n". It's simpler to just always split into a
"struct string_list", even though the common case is that that "struct
string_list" will contain only one element. This is not
performance-sensitive code.

This change is relatively more complex since I've accounted for making
it future-proof for RTL translation support. Later in
usage_with_options_internal() we have some existing padding code
dating back to d7a38c54a6c (parse-options: be able to generate usages
automatically, 2007-10-15) which isn't RTL-safe, but that code would
be easy to fix. Let's not introduce new RTL translation problems here.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-09-22 16:17:45 -07:00

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#include "git-compat-util.h"
#include "parse-options.h"
#include "cache.h"
#include "config.h"
#include "commit.h"
#include "color.h"
#include "utf8.h"
static int disallow_abbreviated_options;
#define OPT_SHORT 1
#define OPT_UNSET 2
int optbug(const struct option *opt, const char *reason)
{
if (opt->long_name) {
if (opt->short_name)
return error("BUG: switch '%c' (--%s) %s",
opt->short_name, opt->long_name, reason);
return error("BUG: option '%s' %s", opt->long_name, reason);
}
return error("BUG: switch '%c' %s", opt->short_name, reason);
}
static enum parse_opt_result get_arg(struct parse_opt_ctx_t *p,
const struct option *opt,
int flags, const char **arg)
{
if (p->opt) {
*arg = p->opt;
p->opt = NULL;
} else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
*arg = (const char *)opt->defval;
} else if (p->argc > 1) {
p->argc--;
*arg = *++p->argv;
} else
return error(_("%s requires a value"), optname(opt, flags));
return 0;
}
static void fix_filename(const char *prefix, const char **file)
{
if (!file || !*file || !prefix || is_absolute_path(*file)
|| !strcmp("-", *file))
return;
*file = prefix_filename(prefix, *file);
}
static enum parse_opt_result opt_command_mode_error(
const struct option *opt,
const struct option *all_opts,
int flags)
{
const struct option *that;
struct strbuf that_name = STRBUF_INIT;
/*
* Find the other option that was used to set the variable
* already, and report that this is not compatible with it.
*/
for (that = all_opts; that->type != OPTION_END; that++) {
if (that == opt ||
!(that->flags & PARSE_OPT_CMDMODE) ||
that->value != opt->value ||
that->defval != *(int *)opt->value)
continue;
if (that->long_name)
strbuf_addf(&that_name, "--%s", that->long_name);
else
strbuf_addf(&that_name, "-%c", that->short_name);
error(_("%s is incompatible with %s"),
optname(opt, flags), that_name.buf);
strbuf_release(&that_name);
return PARSE_OPT_ERROR;
}
return error(_("%s : incompatible with something else"),
optname(opt, flags));
}
static enum parse_opt_result get_value(struct parse_opt_ctx_t *p,
const struct option *opt,
const struct option *all_opts,
int flags)
{
const char *s, *arg;
const int unset = flags & OPT_UNSET;
int err;
if (unset && p->opt)
return error(_("%s takes no value"), optname(opt, flags));
if (unset && (opt->flags & PARSE_OPT_NONEG))
return error(_("%s isn't available"), optname(opt, flags));
if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
return error(_("%s takes no value"), optname(opt, flags));
/*
* Giving the same mode option twice, although unnecessary,
* is not a grave error, so let it pass.
*/
if ((opt->flags & PARSE_OPT_CMDMODE) &&
*(int *)opt->value && *(int *)opt->value != opt->defval)
return opt_command_mode_error(opt, all_opts, flags);
switch (opt->type) {
case OPTION_LOWLEVEL_CALLBACK:
return opt->ll_callback(p, opt, NULL, unset);
case OPTION_BIT:
if (unset)
*(int *)opt->value &= ~opt->defval;
else
*(int *)opt->value |= opt->defval;
return 0;
case OPTION_NEGBIT:
if (unset)
*(int *)opt->value |= opt->defval;
else
*(int *)opt->value &= ~opt->defval;
return 0;
case OPTION_BITOP:
if (unset)
BUG("BITOP can't have unset form");
*(int *)opt->value &= ~opt->extra;
*(int *)opt->value |= opt->defval;
return 0;
case OPTION_COUNTUP:
if (*(int *)opt->value < 0)
*(int *)opt->value = 0;
*(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
return 0;
case OPTION_SET_INT:
*(int *)opt->value = unset ? 0 : opt->defval;
return 0;
case OPTION_STRING:
if (unset)
*(const char **)opt->value = NULL;
else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
*(const char **)opt->value = (const char *)opt->defval;
else
return get_arg(p, opt, flags, (const char **)opt->value);
return 0;
case OPTION_FILENAME:
err = 0;
if (unset)
*(const char **)opt->value = NULL;
else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
*(const char **)opt->value = (const char *)opt->defval;
else
err = get_arg(p, opt, flags, (const char **)opt->value);
if (!err)
fix_filename(p->prefix, (const char **)opt->value);
return err;
case OPTION_CALLBACK:
{
const char *p_arg = NULL;
int p_unset;
if (unset)
p_unset = 1;
else if (opt->flags & PARSE_OPT_NOARG)
p_unset = 0;
else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
p_unset = 0;
else if (get_arg(p, opt, flags, &arg))
return -1;
else {
p_unset = 0;
p_arg = arg;
}
if (opt->callback)
return (*opt->callback)(opt, p_arg, p_unset) ? (-1) : 0;
else
return (*opt->ll_callback)(p, opt, p_arg, p_unset);
}
case OPTION_INTEGER:
if (unset) {
*(int *)opt->value = 0;
return 0;
}
if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
*(int *)opt->value = opt->defval;
return 0;
}
if (get_arg(p, opt, flags, &arg))
return -1;
if (!*arg)
return error(_("%s expects a numerical value"),
optname(opt, flags));
*(int *)opt->value = strtol(arg, (char **)&s, 10);
if (*s)
return error(_("%s expects a numerical value"),
optname(opt, flags));
return 0;
case OPTION_MAGNITUDE:
if (unset) {
*(unsigned long *)opt->value = 0;
return 0;
}
if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
*(unsigned long *)opt->value = opt->defval;
return 0;
}
if (get_arg(p, opt, flags, &arg))
return -1;
if (!git_parse_ulong(arg, opt->value))
return error(_("%s expects a non-negative integer value"
" with an optional k/m/g suffix"),
optname(opt, flags));
return 0;
default:
BUG("opt->type %d should not happen", opt->type);
}
}
static enum parse_opt_result parse_short_opt(struct parse_opt_ctx_t *p,
const struct option *options)
{
const struct option *all_opts = options;
const struct option *numopt = NULL;
for (; options->type != OPTION_END; options++) {
if (options->short_name == *p->opt) {
p->opt = p->opt[1] ? p->opt + 1 : NULL;
return get_value(p, options, all_opts, OPT_SHORT);
}
/*
* Handle the numerical option later, explicit one-digit
* options take precedence over it.
*/
if (options->type == OPTION_NUMBER)
numopt = options;
}
if (numopt && isdigit(*p->opt)) {
size_t len = 1;
char *arg;
int rc;
while (isdigit(p->opt[len]))
len++;
arg = xmemdupz(p->opt, len);
p->opt = p->opt[len] ? p->opt + len : NULL;
if (numopt->callback)
rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
else
rc = (*numopt->ll_callback)(p, numopt, arg, 0);
free(arg);
return rc;
}
return PARSE_OPT_UNKNOWN;
}
static int has_string(const char *it, const char **array)
{
while (*array)
if (!strcmp(it, *(array++)))
return 1;
return 0;
}
static int is_alias(struct parse_opt_ctx_t *ctx,
const struct option *one_opt,
const struct option *another_opt)
{
const char **group;
if (!ctx->alias_groups)
return 0;
if (!one_opt->long_name || !another_opt->long_name)
return 0;
for (group = ctx->alias_groups; *group; group += 3) {
/* it and other are from the same family? */
if (has_string(one_opt->long_name, group) &&
has_string(another_opt->long_name, group))
return 1;
}
return 0;
}
static enum parse_opt_result parse_long_opt(
struct parse_opt_ctx_t *p, const char *arg,
const struct option *options)
{
const struct option *all_opts = options;
const char *arg_end = strchrnul(arg, '=');
const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
int abbrev_flags = 0, ambiguous_flags = 0;
for (; options->type != OPTION_END; options++) {
const char *rest, *long_name = options->long_name;
int flags = 0, opt_flags = 0;
if (!long_name)
continue;
again:
if (!skip_prefix(arg, long_name, &rest))
rest = NULL;
if (options->type == OPTION_ARGUMENT) {
if (!rest)
continue;
if (*rest == '=')
return error(_("%s takes no value"),
optname(options, flags));
if (*rest)
continue;
if (options->value)
*(int *)options->value = options->defval;
p->out[p->cpidx++] = arg - 2;
return PARSE_OPT_DONE;
}
if (!rest) {
/* abbreviated? */
if (!(p->flags & PARSE_OPT_KEEP_UNKNOWN) &&
!strncmp(long_name, arg, arg_end - arg)) {
is_abbreviated:
if (abbrev_option &&
!is_alias(p, abbrev_option, options)) {
/*
* If this is abbreviated, it is
* ambiguous. So when there is no
* exact match later, we need to
* error out.
*/
ambiguous_option = abbrev_option;
ambiguous_flags = abbrev_flags;
}
if (!(flags & OPT_UNSET) && *arg_end)
p->opt = arg_end + 1;
abbrev_option = options;
abbrev_flags = flags ^ opt_flags;
continue;
}
/* negation allowed? */
if (options->flags & PARSE_OPT_NONEG)
continue;
/* negated and abbreviated very much? */
if (starts_with("no-", arg)) {
flags |= OPT_UNSET;
goto is_abbreviated;
}
/* negated? */
if (!starts_with(arg, "no-")) {
if (skip_prefix(long_name, "no-", &long_name)) {
opt_flags |= OPT_UNSET;
goto again;
}
continue;
}
flags |= OPT_UNSET;
if (!skip_prefix(arg + 3, long_name, &rest)) {
/* abbreviated and negated? */
if (starts_with(long_name, arg + 3))
goto is_abbreviated;
else
continue;
}
}
if (*rest) {
if (*rest != '=')
continue;
p->opt = rest + 1;
}
return get_value(p, options, all_opts, flags ^ opt_flags);
}
if (disallow_abbreviated_options && (ambiguous_option || abbrev_option))
die("disallowed abbreviated or ambiguous option '%.*s'",
(int)(arg_end - arg), arg);
if (ambiguous_option) {
error(_("ambiguous option: %s "
"(could be --%s%s or --%s%s)"),
arg,
(ambiguous_flags & OPT_UNSET) ? "no-" : "",
ambiguous_option->long_name,
(abbrev_flags & OPT_UNSET) ? "no-" : "",
abbrev_option->long_name);
return PARSE_OPT_HELP;
}
if (abbrev_option)
return get_value(p, abbrev_option, all_opts, abbrev_flags);
return PARSE_OPT_UNKNOWN;
}
static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
const struct option *options)
{
const struct option *all_opts = options;
for (; options->type != OPTION_END; options++) {
if (!(options->flags & PARSE_OPT_NODASH))
continue;
if (options->short_name == arg[0] && arg[1] == '\0')
return get_value(p, options, all_opts, OPT_SHORT);
}
return -2;
}
static void check_typos(const char *arg, const struct option *options)
{
if (strlen(arg) < 3)
return;
if (starts_with(arg, "no-")) {
error(_("did you mean `--%s` (with two dashes)?"), arg);
exit(129);
}
for (; options->type != OPTION_END; options++) {
if (!options->long_name)
continue;
if (starts_with(options->long_name, arg)) {
error(_("did you mean `--%s` (with two dashes)?"), arg);
exit(129);
}
}
}
static void parse_options_check(const struct option *opts)
{
int err = 0;
char short_opts[128];
memset(short_opts, '\0', sizeof(short_opts));
for (; opts->type != OPTION_END; opts++) {
if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
(opts->flags & PARSE_OPT_OPTARG))
err |= optbug(opts, "uses incompatible flags "
"LASTARG_DEFAULT and OPTARG");
if (opts->short_name) {
if (0x7F <= opts->short_name)
err |= optbug(opts, "invalid short name");
else if (short_opts[opts->short_name]++)
err |= optbug(opts, "short name already used");
}
if (opts->flags & PARSE_OPT_NODASH &&
((opts->flags & PARSE_OPT_OPTARG) ||
!(opts->flags & PARSE_OPT_NOARG) ||
!(opts->flags & PARSE_OPT_NONEG) ||
opts->long_name))
err |= optbug(opts, "uses feature "
"not supported for dashless options");
switch (opts->type) {
case OPTION_COUNTUP:
case OPTION_BIT:
case OPTION_NEGBIT:
case OPTION_SET_INT:
case OPTION_NUMBER:
if ((opts->flags & PARSE_OPT_OPTARG) ||
!(opts->flags & PARSE_OPT_NOARG))
err |= optbug(opts, "should not accept an argument");
break;
case OPTION_CALLBACK:
if (!opts->callback && !opts->ll_callback)
BUG("OPTION_CALLBACK needs one callback");
if (opts->callback && opts->ll_callback)
BUG("OPTION_CALLBACK can't have two callbacks");
break;
case OPTION_LOWLEVEL_CALLBACK:
if (!opts->ll_callback)
BUG("OPTION_LOWLEVEL_CALLBACK needs a callback");
if (opts->callback)
BUG("OPTION_LOWLEVEL_CALLBACK needs no high level callback");
break;
case OPTION_ALIAS:
BUG("OPT_ALIAS() should not remain at this point. "
"Are you using parse_options_step() directly?\n"
"That case is not supported yet.");
default:
; /* ok. (usually accepts an argument) */
}
if (opts->argh &&
strcspn(opts->argh, " _") != strlen(opts->argh))
err |= optbug(opts, "multi-word argh should use dash to separate words");
}
if (err)
exit(128);
}
static void parse_options_start_1(struct parse_opt_ctx_t *ctx,
int argc, const char **argv, const char *prefix,
const struct option *options, int flags)
{
ctx->argc = argc;
ctx->argv = argv;
if (!(flags & PARSE_OPT_ONE_SHOT)) {
ctx->argc--;
ctx->argv++;
}
ctx->total = ctx->argc;
ctx->out = argv;
ctx->prefix = prefix;
ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
ctx->flags = flags;
if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
(flags & PARSE_OPT_STOP_AT_NON_OPTION) &&
!(flags & PARSE_OPT_ONE_SHOT))
BUG("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
if ((flags & PARSE_OPT_ONE_SHOT) &&
(flags & PARSE_OPT_KEEP_ARGV0))
BUG("Can't keep argv0 if you don't have it");
parse_options_check(options);
}
void parse_options_start(struct parse_opt_ctx_t *ctx,
int argc, const char **argv, const char *prefix,
const struct option *options, int flags)
{
memset(ctx, 0, sizeof(*ctx));
parse_options_start_1(ctx, argc, argv, prefix, options, flags);
}
static void show_negated_gitcomp(const struct option *opts, int show_all,
int nr_noopts)
{
int printed_dashdash = 0;
for (; opts->type != OPTION_END; opts++) {
int has_unset_form = 0;
const char *name;
if (!opts->long_name)
continue;
if (!show_all &&
(opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE)))
continue;
if (opts->flags & PARSE_OPT_NONEG)
continue;
switch (opts->type) {
case OPTION_STRING:
case OPTION_FILENAME:
case OPTION_INTEGER:
case OPTION_MAGNITUDE:
case OPTION_CALLBACK:
case OPTION_BIT:
case OPTION_NEGBIT:
case OPTION_COUNTUP:
case OPTION_SET_INT:
has_unset_form = 1;
break;
default:
break;
}
if (!has_unset_form)
continue;
if (skip_prefix(opts->long_name, "no-", &name)) {
if (nr_noopts < 0)
printf(" --%s", name);
} else if (nr_noopts >= 0) {
if (nr_noopts && !printed_dashdash) {
printf(" --");
printed_dashdash = 1;
}
printf(" --no-%s", opts->long_name);
nr_noopts++;
}
}
}
static int show_gitcomp(const struct option *opts, int show_all)
{
const struct option *original_opts = opts;
int nr_noopts = 0;
for (; opts->type != OPTION_END; opts++) {
const char *suffix = "";
if (!opts->long_name)
continue;
if (!show_all &&
(opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE | PARSE_OPT_FROM_ALIAS)))
continue;
switch (opts->type) {
case OPTION_GROUP:
continue;
case OPTION_STRING:
case OPTION_FILENAME:
case OPTION_INTEGER:
case OPTION_MAGNITUDE:
case OPTION_CALLBACK:
if (opts->flags & PARSE_OPT_NOARG)
break;
if (opts->flags & PARSE_OPT_OPTARG)
break;
if (opts->flags & PARSE_OPT_LASTARG_DEFAULT)
break;
suffix = "=";
break;
default:
break;
}
if (opts->flags & PARSE_OPT_COMP_ARG)
suffix = "=";
if (starts_with(opts->long_name, "no-"))
nr_noopts++;
printf(" --%s%s", opts->long_name, suffix);
}
show_negated_gitcomp(original_opts, show_all, -1);
show_negated_gitcomp(original_opts, show_all, nr_noopts);
fputc('\n', stdout);
return PARSE_OPT_COMPLETE;
}
/*
* Scan and may produce a new option[] array, which should be used
* instead of the original 'options'.
*
* Right now this is only used to preprocess and substitute
* OPTION_ALIAS.
*
* The returned options should be freed using free_preprocessed_options.
*/
static struct option *preprocess_options(struct parse_opt_ctx_t *ctx,
const struct option *options)
{
struct option *newopt;
int i, nr, alias;
int nr_aliases = 0;
for (nr = 0; options[nr].type != OPTION_END; nr++) {
if (options[nr].type == OPTION_ALIAS)
nr_aliases++;
}
if (!nr_aliases)
return NULL;
ALLOC_ARRAY(newopt, nr + 1);
COPY_ARRAY(newopt, options, nr + 1);
/* each alias has two string pointers and NULL */
CALLOC_ARRAY(ctx->alias_groups, 3 * (nr_aliases + 1));
for (alias = 0, i = 0; i < nr; i++) {
int short_name;
const char *long_name;
const char *source;
struct strbuf help = STRBUF_INIT;
int j;
if (newopt[i].type != OPTION_ALIAS)
continue;
short_name = newopt[i].short_name;
long_name = newopt[i].long_name;
source = newopt[i].value;
if (!long_name)
BUG("An alias must have long option name");
strbuf_addf(&help, _("alias of --%s"), source);
for (j = 0; j < nr; j++) {
const char *name = options[j].long_name;
if (!name || strcmp(name, source))
continue;
if (options[j].type == OPTION_ALIAS)
BUG("No please. Nested aliases are not supported.");
memcpy(newopt + i, options + j, sizeof(*newopt));
newopt[i].short_name = short_name;
newopt[i].long_name = long_name;
newopt[i].help = strbuf_detach(&help, NULL);
newopt[i].flags |= PARSE_OPT_FROM_ALIAS;
break;
}
if (j == nr)
BUG("could not find source option '%s' of alias '%s'",
source, newopt[i].long_name);
ctx->alias_groups[alias * 3 + 0] = newopt[i].long_name;
ctx->alias_groups[alias * 3 + 1] = options[j].long_name;
ctx->alias_groups[alias * 3 + 2] = NULL;
alias++;
}
return newopt;
}
static void free_preprocessed_options(struct option *options)
{
int i;
if (!options)
return;
for (i = 0; options[i].type != OPTION_END; i++) {
if (options[i].flags & PARSE_OPT_FROM_ALIAS)
free((void *)options[i].help);
}
free(options);
}
static int usage_with_options_internal(struct parse_opt_ctx_t *,
const char * const *,
const struct option *, int, int);
int parse_options_step(struct parse_opt_ctx_t *ctx,
const struct option *options,
const char * const usagestr[])
{
int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
/* we must reset ->opt, unknown short option leave it dangling */
ctx->opt = NULL;
for (; ctx->argc; ctx->argc--, ctx->argv++) {
const char *arg = ctx->argv[0];
if (ctx->flags & PARSE_OPT_ONE_SHOT &&
ctx->argc != ctx->total)
break;
if (*arg != '-' || !arg[1]) {
if (parse_nodash_opt(ctx, arg, options) == 0)
continue;
if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
return PARSE_OPT_NON_OPTION;
ctx->out[ctx->cpidx++] = ctx->argv[0];
continue;
}
/* lone -h asks for help */
if (internal_help && ctx->total == 1 && !strcmp(arg + 1, "h"))
goto show_usage;
/*
* lone --git-completion-helper and --git-completion-helper-all
* are asked by git-completion.bash
*/
if (ctx->total == 1 && !strcmp(arg, "--git-completion-helper"))
return show_gitcomp(options, 0);
if (ctx->total == 1 && !strcmp(arg, "--git-completion-helper-all"))
return show_gitcomp(options, 1);
if (arg[1] != '-') {
ctx->opt = arg + 1;
switch (parse_short_opt(ctx, options)) {
case PARSE_OPT_ERROR:
return PARSE_OPT_ERROR;
case PARSE_OPT_UNKNOWN:
if (ctx->opt)
check_typos(arg + 1, options);
if (internal_help && *ctx->opt == 'h')
goto show_usage;
goto unknown;
case PARSE_OPT_NON_OPTION:
case PARSE_OPT_HELP:
case PARSE_OPT_COMPLETE:
BUG("parse_short_opt() cannot return these");
case PARSE_OPT_DONE:
break;
}
if (ctx->opt)
check_typos(arg + 1, options);
while (ctx->opt) {
switch (parse_short_opt(ctx, options)) {
case PARSE_OPT_ERROR:
return PARSE_OPT_ERROR;
case PARSE_OPT_UNKNOWN:
if (internal_help && *ctx->opt == 'h')
goto show_usage;
/* fake a short option thing to hide the fact that we may have
* started to parse aggregated stuff
*
* This is leaky, too bad.
*/
ctx->argv[0] = xstrdup(ctx->opt - 1);
*(char *)ctx->argv[0] = '-';
goto unknown;
case PARSE_OPT_NON_OPTION:
case PARSE_OPT_COMPLETE:
case PARSE_OPT_HELP:
BUG("parse_short_opt() cannot return these");
case PARSE_OPT_DONE:
break;
}
}
continue;
}
if (!arg[2] /* "--" */ ||
!strcmp(arg + 2, "end-of-options")) {
if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
ctx->argc--;
ctx->argv++;
}
break;
}
if (internal_help && !strcmp(arg + 2, "help-all"))
return usage_with_options_internal(ctx, usagestr, options, 1, 0);
if (internal_help && !strcmp(arg + 2, "help"))
goto show_usage;
switch (parse_long_opt(ctx, arg + 2, options)) {
case PARSE_OPT_ERROR:
return PARSE_OPT_ERROR;
case PARSE_OPT_UNKNOWN:
goto unknown;
case PARSE_OPT_HELP:
goto show_usage;
case PARSE_OPT_NON_OPTION:
case PARSE_OPT_COMPLETE:
BUG("parse_long_opt() cannot return these");
case PARSE_OPT_DONE:
break;
}
continue;
unknown:
if (ctx->flags & PARSE_OPT_ONE_SHOT)
break;
if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
return PARSE_OPT_UNKNOWN;
ctx->out[ctx->cpidx++] = ctx->argv[0];
ctx->opt = NULL;
}
return PARSE_OPT_DONE;
show_usage:
return usage_with_options_internal(ctx, usagestr, options, 0, 0);
}
int parse_options_end(struct parse_opt_ctx_t *ctx)
{
if (ctx->flags & PARSE_OPT_ONE_SHOT)
return ctx->total - ctx->argc;
MOVE_ARRAY(ctx->out + ctx->cpidx, ctx->argv, ctx->argc);
ctx->out[ctx->cpidx + ctx->argc] = NULL;
return ctx->cpidx + ctx->argc;
}
int parse_options(int argc, const char **argv, const char *prefix,
const struct option *options, const char * const usagestr[],
int flags)
{
struct parse_opt_ctx_t ctx;
struct option *real_options;
disallow_abbreviated_options =
git_env_bool("GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS", 0);
memset(&ctx, 0, sizeof(ctx));
real_options = preprocess_options(&ctx, options);
if (real_options)
options = real_options;
parse_options_start_1(&ctx, argc, argv, prefix, options, flags);
switch (parse_options_step(&ctx, options, usagestr)) {
case PARSE_OPT_HELP:
case PARSE_OPT_ERROR:
exit(129);
case PARSE_OPT_COMPLETE:
exit(0);
case PARSE_OPT_NON_OPTION:
case PARSE_OPT_DONE:
break;
default: /* PARSE_OPT_UNKNOWN */
if (ctx.argv[0][1] == '-') {
error(_("unknown option `%s'"), ctx.argv[0] + 2);
} else if (isascii(*ctx.opt)) {
error(_("unknown switch `%c'"), *ctx.opt);
} else {
error(_("unknown non-ascii option in string: `%s'"),
ctx.argv[0]);
}
usage_with_options(usagestr, options);
}
precompose_argv_prefix(argc, argv, NULL);
free_preprocessed_options(real_options);
free(ctx.alias_groups);
return parse_options_end(&ctx);
}
static int usage_argh(const struct option *opts, FILE *outfile)
{
const char *s;
int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
!opts->argh || !!strpbrk(opts->argh, "()<>[]|");
if (opts->flags & PARSE_OPT_OPTARG)
if (opts->long_name)
s = literal ? "[=%s]" : "[=<%s>]";
else
s = literal ? "[%s]" : "[<%s>]";
else
s = literal ? " %s" : " <%s>";
return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
}
#define USAGE_OPTS_WIDTH 24
#define USAGE_GAP 2
static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
const char * const *usagestr,
const struct option *opts, int full, int err)
{
FILE *outfile = err ? stderr : stdout;
int need_newline;
const char *usage_prefix = _("usage: %s");
/*
* The translation could be anything, but we can count on
* msgfmt(1)'s --check option to have asserted that "%s" is in
* the translation. So compute the length of the "usage: "
* part. We are assuming that the translator wasn't overly
* clever and used e.g. "%1$s" instead of "%s", there's only
* one "%s" in "usage_prefix" above, so there's no reason to
* do so even with a RTL language.
*/
size_t usage_len = strlen(usage_prefix) - strlen("%s");
/*
* TRANSLATORS: the colon here should align with the
* one in "usage: %s" translation.
*/
const char *or_prefix = _(" or: %s");
/*
* TRANSLATORS: You should only need to translate this format
* string if your language is a RTL language (e.g. Arabic,
* Hebrew etc.), not if it's a LTR language (e.g. German,
* Russian, Chinese etc.).
*
* When a translated usage string has an embedded "\n" it's
* because options have wrapped to the next line. The line
* after the "\n" will then be padded to align with the
* command name, such as N_("git cmd [opt]\n<8
* spaces>[opt2]"), where the 8 spaces are the same length as
* "git cmd ".
*
* This format string prints out that already-translated
* line. The "%*s" is whitespace padding to account for the
* padding at the start of the line that we add in this
* function. The "%s" is a line in the (hopefully already
* translated) N_() usage string, which contained embedded
* newlines before we split it up.
*/
const char *usage_continued = _("%*s%s");
const char *prefix = usage_prefix;
int saw_empty_line = 0;
if (!usagestr)
return PARSE_OPT_HELP;
if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
fprintf(outfile, "cat <<\\EOF\n");
while (*usagestr) {
const char *str = _(*usagestr++);
struct string_list list = STRING_LIST_INIT_DUP;
unsigned int j;
if (!saw_empty_line && !*str)
saw_empty_line = 1;
string_list_split(&list, str, '\n', -1);
for (j = 0; j < list.nr; j++) {
const char *line = list.items[j].string;
if (saw_empty_line && *line)
fprintf_ln(outfile, _(" %s"), line);
else if (saw_empty_line)
fputc('\n', outfile);
else if (!j)
fprintf_ln(outfile, prefix, line);
else
fprintf_ln(outfile, usage_continued,
(int)usage_len, "", line);
}
string_list_clear(&list, 0);
prefix = or_prefix;
}
need_newline = 1;
for (; opts->type != OPTION_END; opts++) {
size_t pos;
int pad;
if (opts->type == OPTION_GROUP) {
fputc('\n', outfile);
need_newline = 0;
if (*opts->help)
fprintf(outfile, "%s\n", _(opts->help));
continue;
}
if (!full && (opts->flags & PARSE_OPT_HIDDEN))
continue;
if (need_newline) {
fputc('\n', outfile);
need_newline = 0;
}
pos = fprintf(outfile, " ");
if (opts->short_name) {
if (opts->flags & PARSE_OPT_NODASH)
pos += fprintf(outfile, "%c", opts->short_name);
else
pos += fprintf(outfile, "-%c", opts->short_name);
}
if (opts->long_name && opts->short_name)
pos += fprintf(outfile, ", ");
if (opts->long_name)
pos += fprintf(outfile, "--%s", opts->long_name);
if (opts->type == OPTION_NUMBER)
pos += utf8_fprintf(outfile, _("-NUM"));
if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
!(opts->flags & PARSE_OPT_NOARG))
pos += usage_argh(opts, outfile);
if (pos <= USAGE_OPTS_WIDTH)
pad = USAGE_OPTS_WIDTH - pos;
else {
fputc('\n', outfile);
pad = USAGE_OPTS_WIDTH;
}
if (opts->type == OPTION_ALIAS) {
fprintf(outfile, "%*s", pad + USAGE_GAP, "");
fprintf_ln(outfile, _("alias of --%s"),
(const char *)opts->value);
continue;
}
fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
}
fputc('\n', outfile);
if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
fputs("EOF\n", outfile);
return PARSE_OPT_HELP;
}
void NORETURN usage_with_options(const char * const *usagestr,
const struct option *opts)
{
usage_with_options_internal(NULL, usagestr, opts, 0, 1);
exit(129);
}
void NORETURN usage_msg_opt(const char *msg,
const char * const *usagestr,
const struct option *options)
{
fprintf(stderr, "fatal: %s\n\n", msg);
usage_with_options(usagestr, options);
}
const char *optname(const struct option *opt, int flags)
{
static struct strbuf sb = STRBUF_INIT;
strbuf_reset(&sb);
if (flags & OPT_SHORT)
strbuf_addf(&sb, "switch `%c'", opt->short_name);
else if (flags & OPT_UNSET)
strbuf_addf(&sb, "option `no-%s'", opt->long_name);
else
strbuf_addf(&sb, "option `%s'", opt->long_name);
return sb.buf;
}
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