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-rw-r--r--Documentation/technical/api-parse-options.txt5
-rw-r--r--parse-options-cb.c5
-rw-r--r--parse-options.h6
-rwxr-xr-xt/t0040-parse-options.sh2
-rw-r--r--test-parse-options.c1
5 files changed, 18 insertions, 1 deletions
diff --git a/Documentation/technical/api-parse-options.txt b/Documentation/technical/api-parse-options.txt
index acf17607df..4b92514f60 100644
--- a/Documentation/technical/api-parse-options.txt
+++ b/Documentation/technical/api-parse-options.txt
@@ -204,6 +204,11 @@ There are some macros to easily define options:
"auto", set `int_var` to 1 if stdout is a tty or a pager,
0 otherwise.
+`OPT_NOOP_NOARG(short, long)`::
+ Introduce an option that has no effect and takes no arguments.
+ Use it to hide deprecated options that are still to be recognized
+ and ignored silently.
+
The last element of the array must be `OPT_END()`.
diff --git a/parse-options-cb.c b/parse-options-cb.c
index 6db0921fc1..0de5fb168a 100644
--- a/parse-options-cb.c
+++ b/parse-options-cb.c
@@ -123,3 +123,8 @@ int parse_opt_string_list(const struct option *opt, const char *arg, int unset)
string_list_append(v, xstrdup(arg));
return 0;
}
+
+int parse_opt_noop_cb(const struct option *opt, const char *arg, int unset)
+{
+ return 0;
+}
diff --git a/parse-options.h b/parse-options.h
index 22c0273052..2e811dc7da 100644
--- a/parse-options.h
+++ b/parse-options.h
@@ -153,6 +153,11 @@ struct option {
{ OPTION_CALLBACK, (s), (l), (v), "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, \
+ "no-op (backward compatibility)", \
+ PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, parse_opt_noop_cb }
+
/* Deprecated synonym */
#define OPT_BOOLEAN OPT_COUNTUP
@@ -216,6 +221,7 @@ 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);
extern int parse_opt_string_list(const struct option *, const char *, int);
+extern int parse_opt_noop_cb(const struct option *, const char *, int);
#define OPT__VERBOSE(var, h) OPT_BOOLEAN('v', "verbose", (var), (h))
#define OPT__QUIET(var, h) OPT_BOOLEAN('q', "quiet", (var), (h))
diff --git a/t/t0040-parse-options.sh b/t/t0040-parse-options.sh
index 007f39d5e1..a1e4616feb 100755
--- a/t/t0040-parse-options.sh
+++ b/t/t0040-parse-options.sh
@@ -87,7 +87,7 @@ EOF
test_expect_success 'long options' '
test-parse-options --boolean --integer 1729 --boolean --string2=321 \
--verbose --verbose --no-dry-run --abbrev=10 --file fi.le\
- > output 2> output.err &&
+ --obsolete > output 2> output.err &&
test ! -s output.err &&
test_cmp expect output
'
diff --git a/test-parse-options.c b/test-parse-options.c
index 91a5701657..36487c402b 100644
--- a/test-parse-options.c
+++ b/test-parse-options.c
@@ -54,6 +54,7 @@ int main(int argc, const char **argv)
OPT_STRING(0, "string2", &string, "str", "get another string"),
OPT_STRING(0, "st", &string, "st", "get another string (pervert ordering)"),
OPT_STRING('o', NULL, &string, "str", "get another string"),
+ OPT_NOOP_NOARG(0, "obsolete"),
OPT_SET_PTR(0, "default-string", &string,
"set string to default", (unsigned long)"default"),
OPT_STRING_LIST(0, "list", &list, "str", "add str to list"),