rev-parse --parseopt: add the --stuck-long mode

Add the --stuck-long option to output the options in their long form
if available, and with their arguments stuck.

Contrary to the default form (non stuck arguments and short options),
this can be parsed unambiguously when using options with optional
arguments :

 - in the non stuck form, when an option is taking an optional argument
   you cannot know if the next argument is its optional argument, or the
   next option.

 - the long options form allows to differentiate between an empty argument
   '--option=' and an unset argument '--option', which is not possible
   with short options.

Signed-off-by: Nicolas Vigier <boklm@mars-attacks.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index d068a653778d6713d6ab370379dadf0d6f754856..a436b24cc4068419280e80e0513dec40c383c0c0 100644 (file)
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -50,6 +50,10 @@ Options for --parseopt
        the first non-option argument.  This can be used to parse sub-commands
        that take options themselves.
 
+--stuck-long::
+       Only meaningful in `--parseopt` mode. Output the options in their
+       long form if available, and with their arguments stuck.
+
 Options for Filtering
 ~~~~~~~~~~~~~~~~~~~~~
 
@@ -285,7 +289,9 @@ Each line of options has this format:
        `<flags>` are of `*`, `=`, `?` or `!`.
        * Use `=` if the option takes an argument.
 
-       * Use `?` to mean that the option is optional (though its use is discouraged).
+       * Use `?` to mean that the option takes an optional argument. You
+         probably want to use the `--stuck-long` mode to be able to
+         unambiguously parse the optional argument.
 
        * Use `*` to mean that this option should not be listed in the usage
          generated for the `-h` argument. It's shown for `--help-all` as

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index c76b89dc5bcccb42f7c2613072b1093a58c7d21c..3e8c4cce060ed4d4bc4ea881f45546d6cffc725c 100644 (file)
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -30,6 +30,8 @@ static int abbrev_ref;
 static int abbrev_ref_strict;
 static int output_sq;
 
+static int stuck_long;
+
 /*
  * Some arguments are relevant "revision" arguments,
  * others are about output format or other details.
@@ -320,12 +322,15 @@ static int parseopt_dump(const struct option *o, const char *arg, int unset)
        struct strbuf *parsed = o->value;
        if (unset)
                strbuf_addf(parsed, " --no-%s", o->long_name);
-       else if (o->short_name)
+       else if (o->short_name && (o->long_name == NULL || !stuck_long))
                strbuf_addf(parsed, " -%c", o->short_name);
        else
                strbuf_addf(parsed, " --%s", o->long_name);
        if (arg) {
-               strbuf_addch(parsed, ' ');
+               if (!stuck_long)
+                       strbuf_addch(parsed, ' ');
+               else if (o->long_name)
+                       strbuf_addch(parsed, '=');
                sq_quote_buf(parsed, arg);
        }
        return 0;
@@ -351,6 +356,8 @@ static int cmd_parseopt(int argc, const char **argv, const char *prefix)
                OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
                                        N_("stop parsing after the "
                                           "first non-option argument")),
+               OPT_BOOL(0, "stuck-long", &stuck_long,
+                                       N_("output in stuck long form")),
                OPT_END(),
        };
 

diff --git a/t/t1502-rev-parse-parseopt.sh b/t/t1502-rev-parse-parseopt.sh
index 13c88c9aae7f7177cbff278cf5e587f86acb11e7..83b1300cef91c2a13ef58af4ab7a42618388bd01 100755 (executable)
--- a/t/t1502-rev-parse-parseopt.sh
+++ b/t/t1502-rev-parse-parseopt.sh
@@ -12,9 +12,11 @@ usage: some-command [options] <args>...
     -h, --help            show the help
     --foo                 some nifty option --foo
     --bar ...             some cool option --bar with an argument
+    -b, --baz             a short and long option
 
 An option group Header
     -C[...]               option C with an optional argument
+    -d, --data[=...]      short and long option with an optional argument
 
 Extras
     --extra1              line above used to cause a segfault but no longer does
@@ -31,9 +33,11 @@ h,help    show the help
 
 foo       some nifty option --foo
 bar=      some cool option --bar with an argument
+b,baz     a short and long option
 
  An option group Header
 C?        option C with an optional argument
+d,data?   short and long option with an optional argument
 
 Extras
 extra1    line above used to cause a segfault but no longer does
@@ -45,16 +49,16 @@ test_expect_success 'test --parseopt help output' '
 '
 
 cat > expect <<EOF
-set -- --foo --bar 'ham' -- 'arg'
+set -- --foo --bar 'ham' -b -- 'arg'
 EOF
 
 test_expect_success 'test --parseopt' '
-       git rev-parse --parseopt -- --foo --bar=ham arg < optionspec > output &&
+       git rev-parse --parseopt -- --foo --bar=ham --baz arg < optionspec > output &&
        test_cmp expect output
 '
 
 test_expect_success 'test --parseopt with mixed options and arguments' '
-       git rev-parse --parseopt -- --foo arg --bar=ham < optionspec > output &&
+       git rev-parse --parseopt -- --foo arg --bar=ham --baz < optionspec > output &&
        test_cmp expect output
 '
 
@@ -99,4 +103,36 @@ test_expect_success 'test --parseopt --keep-dashdash --stop-at-non-option withou
        test_cmp expect output
 '
 
+cat > expect <<EOF
+set -- --foo --bar='z' --baz -C'Z' --data='A' -- 'arg'
+EOF
+
+test_expect_success 'test --parseopt --stuck-long' '
+       git rev-parse --parseopt --stuck-long -- --foo --bar=z -b arg -CZ -dA <optionspec >output &&
+       test_cmp expect output
+'
+
+cat > expect <<EOF
+set -- --data='' -C --baz -- 'arg'
+EOF
+
+test_expect_success 'test --parseopt --stuck-long and empty optional argument' '
+       git rev-parse --parseopt --stuck-long -- --data= arg -C -b <optionspec >output &&
+       test_cmp expect output
+'
+
+cat > expect <<EOF
+set -- --data --baz -- 'arg'
+EOF
+
+test_expect_success 'test --parseopt --stuck-long and long option with unset optional argument' '
+       git rev-parse --parseopt --stuck-long -- --data arg -b <optionspec >output &&
+       test_cmp expect output
+'
+
+test_expect_success 'test --parseopt --stuck-long and short option with unset optional argument' '
+       git rev-parse --parseopt --stuck-long -- -d arg -b <optionspec >output &&
+       test_cmp expect output
+'
+
 test_done