On Thu, Apr 18, 2019 at 09:48:39AM +0900, Junio C Hamano wrote:
> > But on the other hand I can see it's a bit more work to teach
> > parse-options OPT_ALIAS to say "--recursive is just an alias of
> > --recurse-submodules" and chances of --recursive-hard coming up are
> > probably very low.
>
> The "bit more work" is something that is worth doing in this case, I
> think.
I had a look at it. Linking two options together is not exactly easy
because the way we organize option data. And I also had difficulty
defining the exact semantics of this OPT_ALIAS.
So an alternative is simply outsource the ambiguity decision back to
git-clone. If the same situation appears again elsewhere, we'll need
to sit back and fix it for real. But this way we don't potentially
introduce any new traps.
parse_options_extended() also makes it easier to extend parseopt
functionality without changing all call sites. One thing I have in
mind, which could maybe use this interface, is to remove
parse_options_{start,step,end} from public API, avoid expose the
parse_options_step internal result code. The caller just need to pass
a callback to handle unknown options.
-- 8< --
diff --git a/builtin/clone.c b/builtin/clone.c
index 50bde99618..041cd43ddc 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -145,6 +145,29 @@ static struct option builtin_clone_options[] = {
OPT_END()
};
+/*
+ * Avoid ambiguation error between --recursive and --recurse-submodule
+ * because they are the same. --recurs can be expanded to any of them
+ * and it still works.
+ */
+static int is_abbrev_ambiguous(const struct option *prev,
+ const struct option *next)
+{
+ const struct option *opts[] = { prev, next };
+ int i, found = 0;
+
+ for (i = 0; i < ARRAY_SIZE(opts); i++) {
+ if (!opts[i]->long_name)
+ continue;
+ if (!strcmp(opts[i]->long_name, "recursive"))
+ found |= 1 << 0;
+ if (!strcmp(opts[i]->long_name, "recurse-submodules"))
+ found |= 1 << 1;
+ }
+
+ return found != 3;
+}
+
static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
{
static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
@@ -905,14 +928,18 @@ int cmd_clone(int argc, const char **argv, const char
*prefix)
struct remote *remote;
int err = 0, complete_refs_before_fetch = 1;
int submodule_progress;
+ struct parseopt_options parseopts = { 0 };
struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
fetch_if_missing = 0;
packet_trace_identity("clone");
- argc = parse_options(argc, argv, prefix, builtin_clone_options,
- builtin_clone_usage, 0);
+ parseopts.usagestr = builtin_clone_usage;
+ parseopts.is_abbrev_ambiguous = is_abbrev_ambiguous;
+ argc = parse_options_extended(argc, argv, prefix,
+ builtin_clone_options,
+ &parseopts);
if (argc > 2)
usage_msg_opt(_("Too many arguments."),
diff --git a/parse-options.c b/parse-options.c
index cec74522e5..c0354e5a92 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -294,7 +294,8 @@ static enum parse_opt_result parse_long_opt(
if (!(p->flags & PARSE_OPT_KEEP_UNKNOWN) &&
!strncmp(long_name, arg, arg_end - arg)) {
is_abbreviated:
- if (abbrev_option) {
+ if (abbrev_option &&
+ p->is_abbrev_ambiguous(abbrev_option,
options)) {
/*
* If this is abbreviated, it is
* ambiguous. So when there is no
@@ -450,6 +451,12 @@ static void parse_options_check(const struct option *opts)
exit(128);
}
+static int abbrev_is_always_ambiguous(const struct option *prev,
+ const struct option *next)
+{
+ return 1;
+}
+
void parse_options_start(struct parse_opt_ctx_t *ctx,
int argc, const char **argv, const char *prefix,
const struct option *options, int flags)
@@ -466,6 +473,7 @@ void parse_options_start(struct parse_opt_ctx_t *ctx,
ctx->prefix = prefix;
ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
ctx->flags = flags;
+ ctx->is_abbrev_ambiguous = abbrev_is_always_ambiguous;
if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
(flags & PARSE_OPT_STOP_AT_NON_OPTION) &&
!(flags & PARSE_OPT_ONE_SHOT))
@@ -702,13 +710,17 @@ int parse_options_end(struct parse_opt_ctx_t *ctx)
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)
+int parse_options_extended(int argc, const char **argv, const char *prefix,
+ const struct option *options,
+ const struct parseopt_options *parseopts)
{
struct parse_opt_ctx_t ctx;
+ const char * const * usagestr = parseopts->usagestr;
+ int flags = parseopts->flags;
parse_options_start(&ctx, argc, argv, prefix, options, flags);
+ if (parseopts->is_abbrev_ambiguous)
+ ctx.is_abbrev_ambiguous = parseopts->is_abbrev_ambiguous;
switch (parse_options_step(&ctx, options, usagestr)) {
case PARSE_OPT_HELP:
case PARSE_OPT_ERROR:
@@ -734,6 +746,17 @@ int parse_options(int argc, const char **argv, const char
*prefix,
return parse_options_end(&ctx);
}
+int parse_options(int argc, const char **argv, const char *prefix,
+ const struct option *options, const char * const usagestr[],
+ int flags)
+{
+ struct parseopt_options parseopts = {0};
+
+ parseopts.flags = flags;
+ parseopts.usagestr = usagestr;
+ return parse_options_extended(argc, argv, prefix, options, &parseopts);
+}
+
static int usage_argh(const struct option *opts, FILE *outfile)
{
const char *s;
diff --git a/parse-options.h b/parse-options.h
index 74cce4e7fc..31ebf4572c 100644
--- a/parse-options.h
+++ b/parse-options.h
@@ -198,6 +198,17 @@ int parse_options(int argc, const char **argv, const char
*prefix,
const struct option *options,
const char * const usagestr[], int flags);
+struct parseopt_options {
+ int flags;
+ const char * const * usagestr;
+ int (*is_abbrev_ambiguous)(const struct option *prev,
+ const struct option *next);
+};
+
+int parse_options_extended(int argc, const char **argv, const char *prefix,
+ const struct option *options,
+ const struct parseopt_options *parseopts);
+
NORETURN void usage_with_options(const char * const *usagestr,
const struct option *options);
@@ -256,6 +267,7 @@ struct parse_opt_ctx_t {
const char *opt;
int flags;
const char *prefix;
+ int (*is_abbrev_ambiguous)(const struct option *, const struct option
*);
};
void parse_options_start(struct parse_opt_ctx_t *ctx,
-- 8< --
>
> Thanks.
