parse-options: catch likely typo in presense of aggregated options.

If options are aggregated, and that the whole token is an exact
prefix of a long option that is longer than 2 letters, reject
it.  This is to prevent a common typo:

	$ git commit -amend

to get interpreted as "commit all with message 'end'".

The typo check isn't performed if there is no aggregation,
because the stuck form is the recommended one.  If we have `-o`
being a valid short option that takes an argument, and --option
a long one, then we _MUST_ accept -option as "'o' option with
argument 'ption'", which is our official recommended form.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/parse-options.c b/parse-options.c
index 7a08a0c64f9f447e09ef6771d83dbf95f8f3545d..d9562ba5047ff1c9994755a4dbec5162b551c788 100644 (file)
--- a/parse-options.c
+++ b/parse-options.c
@@ -216,6 +216,26 @@ is_abbreviated:
        return error("unknown option `%s'", arg);
 }
 
+void check_typos(const char *arg, const struct option *options)
+{
+       if (strlen(arg) < 3)
+               return;
+
+       if (!prefixcmp(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 (!prefixcmp(options->long_name, arg)) {
+                       error ("did you mean `--%s` (with two dashes ?)", arg);
+                       exit(129);
+               }
+       }
+}
+
 static NORETURN void usage_with_options_internal(const char * const *,
                                                  const struct option *, int);
 
@@ -235,12 +255,18 @@ int parse_options(int argc, const char **argv, const struct option *options,
 
                if (arg[1] != '-') {
                        args.opt = arg + 1;
-                       do {
+                       if (*args.opt == 'h')
+                               usage_with_options(usagestr, options);
+                       if (parse_short_opt(&args, options) < 0)
+                               usage_with_options(usagestr, options);
+                       if (args.opt)
+                               check_typos(arg + 1, options);
+                       while (args.opt) {
                                if (*args.opt == 'h')
                                        usage_with_options(usagestr, options);
                                if (parse_short_opt(&args, options) < 0)
                                        usage_with_options(usagestr, options);
-                       } while (args.opt);
+                       }
                        continue;
                }
 

diff --git a/t/t0040-parse-options.sh b/t/t0040-parse-options.sh
index 462fdf262fe451c14679753018a415e1cc778732..0a3b55d1212ddeda87f1f3ffa4c4e2fbefb44553 100755 (executable)
--- a/t/t0040-parse-options.sh
+++ b/t/t0040-parse-options.sh
@@ -19,6 +19,7 @@ string options
                           get a string
     --string2 <str>       get another string
     --st <st>             get another string (pervert ordering)
+    -o <str>              get another string
 
 EOF
 
@@ -103,4 +104,14 @@ test_expect_success 'non ambiguous option (after two options it abbreviates)' '
        git diff expect output
 '
 
+cat > expect.err << EOF
+error: did you mean \`--boolean\` (with two dashes ?)
+EOF
+
+test_expect_success 'detect possible typos' '
+       ! test-parse-options -boolean > output 2> output.err &&
+       test ! -s output &&
+       git diff expect.err output.err
+'
+
 test_done

diff --git a/test-parse-options.c b/test-parse-options.c
index 4d3e2ec39e33f6301cc6df162dab7de9dbb2ea80..eed8a02c6589bcb9af46188b56054eace3cd4d19 100644 (file)
--- a/test-parse-options.c
+++ b/test-parse-options.c
@@ -19,6 +19,7 @@ int main(int argc, const char **argv)
                OPT_STRING('s', "string", &string, "string", "get a string"),
                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_END(),
        };
        int i;