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move metavar fallback stuff into arg_optional

master
Daniel Kolesa 2017-05-28 16:16:13 +02:00
parent e37a8e325e
commit e3acfa3005
1 changed files with 27 additions and 16 deletions
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43
ostd/argparse.hh
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@ -251,6 +251,32 @@ struct arg_optional: arg_argument {
return arg_argument::metavar();
}
/** @brief Gets the actual metavar used in help listing.
*
* Unlike just metavar(), it accounts for the case when the
* provided metavar is empty, falling back to transforming
* a suitable argument name into one.
*/
std::string real_metavar() const {
std::string mt{metavar()};
if (mt.empty()) {
string_range fb = longest_name();
if (!fb.empty()) {
char pfx = fb[0];
while (!fb.empty() && (fb.front() == pfx)) {
fb.pop_front();
}
}
if (fb.empty()) {
mt = "VALUE";
} else {
mt.append(fb.data(), fb.size());
std::transform(mt.begin(), mt.end(), mt.begin(), toupper);
}
}
return mt;
}
/** @brief Sets the limit on how many times this can be used.
*
* By default there is no limit (the value is 0). You can use this
@ -1649,22 +1675,7 @@ struct default_help_formatter {
*/
template<typename OutputRange>
void format_option(OutputRange &out, arg_optional const &arg) {
std::string mt{arg.metavar()};
if (mt.empty()) {
string_range fb = arg.longest_name();
if (!fb.empty()) {
char pfx = fb[0];
while (!fb.empty() && (fb.front() == pfx)) {
fb.pop_front();
}
}
if (fb.empty()) {
mt = "VALUE";
} else {
mt.append(fb.data(), fb.size());
std::transform(mt.begin(), mt.end(), mt.begin(), toupper);
}
}
std::string mt = arg.real_metavar();
bool first = true;
for (auto &s: arg.names()) {
if (!first) {