Paul Tan <pyoka...@gmail.com> writes:
> I don't see how it feels iffy.
That is largely a taste thing. And a good taste matters.
What is iffy is to use strbuf as an external interface between the
implementation of the parse_opt_pass() API function and its users.
I would expect that no users of the parse_opt_pass() would ever take
advantage of the fact that the value they are using is implemented
as a strbuf, allowing them to use the family of functions in the
strbuf API to further manipulate it. All users you added wants to
use a plain vanilla string, and only because you used strbuf as the
interface element, they have to say "var.buf" to get to the value
they want to use.
> The purpose of using strbufs (and
> argv_arrays) is to avoid error-prone manual memory management.
It is a good idea to use strbuf as an implementation detail of
parse_opt_pass() function. After all, safer, easier and efficient
manipulation of strings is why we added the strbuf API to the system
in the first place.
But it is a different matter to expose that as an API element when
the recipient is not going to benefit.
In other words, callers of the API designed with a better taste
would look more like this:
static const char *opt_diffstat;
static struct option pull_options[] = {
...
{ OPTION_CALLBACK, 'n', NULL, &opt_diffstat, NULL,
N_("do not show a diffstat at the end of the merge"),
PARSE_OPT_NOARG | PARSE_OPT_NONEG, parse_opt_pass
},
...
};
static int run_merge(void)
{
...
if (opt_diffstat)
argv_array_push(&args, opt_diffstat);
...
}
That way, they do not have to define strbuf variables and
dereference the value as opt_diffstat.buf.
And the implementation of the API element is not all that different
from what you wrote:
int parse_opt_pass(const struct options *opt, const char *arg, int
unset)
{
struct strbuf sb = STRBUF_INIT;
char **value = opt->value;
if (*value)
free(*value);
if (opt->long_name) {
strbuf_addf(&sb, "--%s%s",
unset ? "no-" : "",
opt->long_name);
...
}
...
*value = strbuf_detach(&sb, NULL);
return 0;
}
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