Taylor Blau <m...@ttaylorr.com> writes:
> Attached is the eighth re-roll of my series to add `--type=<type>` as
> the preferred alternative for `--<type>`.
>
> The main changes since v7 concern handling degenerate cases, such as:
>
> * git config --type=int --type=bool
> * git config --type=int --int
>
> We have previously had discussion about whether we should (1) retain the
> error in previous versions when confronted with multiple, conflicting
> type specifiers, (2) ignore the error, in favor of making --<type> and
> --type=<type> true synonyms, or (3) some combination of the two.
>
> I have thought some more about my argument that it would be favorable to
> make "--type=int" and "--int" behave in the same way, and I am no
> longer convinced that my argument makes sense. It's based on the premise
> that "--type=<type>" must _necessarily_ allow multiple invocations, such
> as '--type=int --type=bool', and therefore "--int --bool" should be
> updated to behave the same way.
>
> We are not constrained to this behavior, so in v8, I have taught Git the
> following:
>
> 1. Allow multiple non-conflicting types, such as '--int --int',
> '--type=int --int', and '--int --type=int'.
>
> 2. Disallow multiple conflicting types, such as '--int --bool',
> '--type=int --bool', and '--int --type=bool'.
>
> 3. Allow conflicting types following --no-type, such as '--int
> --no-type --bool', '--type=int --no-type --bool', and '--int
> --no-type --type=bool'. Note that this does _not_ introduce options
> such as '--no-int' and whatnot.
>
> This is accomplished by a new locally defined macro called
> OPT_CALLBACK_VALUE, which allows us to reuse option_parse_type() to
> handle --int as well, by sending it through as opt->defval.
>
> I think that the above is the best-of-all-worlds choice, but I am
> curious to hear everyone else's thoughts. Thanks in advance for your
> review.
I too am curious. Personally I do not think your "last one wins"
was necessarily bad--in fact it internally was consistent--I just
thought that the log message did not justify the choice well. And I
do not think the semantics defined by this one, "once you choose,
stick to it, or explicitly clear the previous choice", is bad,
either.
> diff --git a/builtin/config.c b/builtin/config.c
> index 5c8952a17c..7184c09582 100644
> --- a/builtin/config.c
> +++ b/builtin/config.c
> @@ -61,28 +61,53 @@ static int show_origin;
> #define TYPE_PATH 4
> #define TYPE_EXPIRY_DATE 5
>
> +#define OPT_CALLBACK_VALUE(s, l, h, f, i) \
> + { OPTION_CALLBACK, (s), (l), NULL, NULL, (h), PARSE_OPT_NOARG | \
> + PARSE_OPT_NONEG, (f), (i) }
> +
> +static struct option builtin_config_options[];
OK. I am not sure if OPT_CALLBACK_VALUE() needs to take 'f', as you
always pass the option_parse_type function to it.
> static int option_parse_type(const struct option *opt, const char *arg,
> int unset)
> {
> - int *type = opt->value;
> -
> if (unset) {
> - *type = 0;
> + type = 0;
> return 0;
> }
>
> - if (!strcmp(arg, "bool"))
> - *type = TYPE_BOOL;
> - else if (!strcmp(arg, "int"))
> - *type = TYPE_INT;
> - else if (!strcmp(arg, "bool-or-int"))
> - *type = TYPE_BOOL_OR_INT;
> - else if (!strcmp(arg, "path"))
> - *type = TYPE_PATH;
> - else if (!strcmp(arg, "expiry-date"))
> - *type = TYPE_EXPIRY_DATE;
> - else
> - die(_("unrecognized --type argument, %s"), arg);
> + /*
> + * To support '--<type>' style flags, begin with new_type equal to
> + * opt->defval.
> + */
> + int new_type = opt->defval;
> + if (!new_type) {
> + if (!strcmp(arg, "bool"))
> + new_type = TYPE_BOOL;
> + else if (!strcmp(arg, "int"))
> + new_type = TYPE_INT;
> + else if (!strcmp(arg, "bool-or-int"))
> + new_type = TYPE_BOOL_OR_INT;
> + else if (!strcmp(arg, "path"))
> + new_type = TYPE_PATH;
> + else if (!strcmp(arg, "expiry-date"))
> + new_type = TYPE_EXPIRY_DATE;
> + else
> + die(_("unrecognized --type argument, %s"), arg);
> + }
> +
> + if (type != 0 && type != new_type) {
> + /*
> + * Complain when there is a new type not equal to the old type.
> + * This allows for combinations like '--int --type=int' and
> + * '--type=int --type=int', but disallows ones like '--type=bool
> + * --int' and '--type=bool
> + * --type=int'.
> + */
> + error("only one type at a time.");
> + usage_with_options(builtin_config_usage,
> + builtin_config_options);
> + }
> + type = new_type;
Does this rely on a file-scope global variable (type)?
>
> return 0;
> }
