argparse: action callback support, help string support

master
Daniel Kolesa 2017-05-15 19:55:26 +02:00
parent 5373e3405c
commit ec426a30a1
1 changed files with 87 additions and 21 deletions

View File

@ -69,6 +69,11 @@ protected:
struct arg_argument: arg_description {
friend struct arg_parser;
arg_argument &help(string_range str) {
p_helpstr = std::string{str};
return *this;
}
protected:
arg_argument(arg_value req = arg_value::NONE, int nargs = 1):
arg_description(), p_valreq(req), p_nargs(nargs)
@ -81,6 +86,7 @@ protected:
), p_nargs(nargs)
{}
std::string p_helpstr;
arg_value p_valreq;
int p_nargs;
};
@ -106,22 +112,21 @@ struct arg_optional: arg_argument {
return p_valreq;
}
void set_value(string_range val) {
if (p_action) {
p_value = p_action(val);
} else {
p_value = std::string{val};
}
}
template<typename F>
arg_optional &action(F func) {
p_action = [func = std::move(func)](string_range r) -> std::any {
return func(r);
p_action = [func = std::move(func)](
iterator_range<string_range const *> vals
) -> std::any {
return func(vals);
};
return *this;
}
arg_optional &help(string_range str) {
arg_argument::help(str);
return *this;
}
protected:
arg_optional() = delete;
arg_optional(
@ -134,9 +139,32 @@ protected:
arg_argument(nargs), p_lname(long_name), p_sname(short_name)
{}
void set_values(iterator_range<string_range const *> vals) {
if (p_action) {
p_value = p_action(vals);
} else {
switch (vals.size()) {
case 0:
p_value = true;
break;
case 1:
p_value = std::string{vals.front()};
break;
default: {
std::vector<std::string> strs;
strs.reserve(vals.size());
for (auto s: vals) {
strs.emplace_back(s);
}
p_value = std::move(strs);
}
}
}
}
private:
std::any p_value;
std::function<std::any(string_range)> p_action;
std::function<std::any(iterator_range<string_range const *>)> p_action;
std::string p_lname;
char p_sname;
};
@ -282,32 +310,58 @@ private:
template<typename OR>
void print_help_impl(OR &out) {
bool has_opt = false, has_pos = false;
std::size_t opt_namel = 0, pos_namel = 0;
for (auto &p: p_opts) {
switch (p->type()) {
case arg_type::OPTIONAL:
has_opt = true;
case arg_type::OPTIONAL: {
auto &opt = static_cast<arg_optional &>(*p);
std::size_t nl = 0;
if (opt.p_sname) {
nl += 2;
}
if (!opt.p_lname.empty()) {
if (opt.p_sname) {
nl += 2;
}
nl += opt.p_lname.size() + 2;
}
opt_namel = std::max(opt_namel, nl);
break;
}
case arg_type::POSITIONAL:
has_pos = true;
pos_namel = std::max(
pos_namel,
static_cast<arg_positional &>(*p).p_name.size()
);
break;
default:
break;
}
}
if (has_pos) {
std::size_t maxpad = std::max(opt_namel, pos_namel);
if (pos_namel) {
format(out, "\npositional arguments:\n");
for (auto &p: p_opts) {
if (p->type() != arg_type::POSITIONAL) {
continue;
}
auto &parg = static_cast<arg_positional &>(*p.get());
format(out, " %s\n", parg.p_name);
format(out, " %s", parg.p_name);
if (parg.p_helpstr.empty()) {
out.put('\n');
} else {
std::size_t nd = maxpad - parg.p_name.size() + 2;
for (std::size_t i = 0; i < nd; ++i) {
out.put(' ');
}
format(out, "%s\n", parg.p_helpstr);
}
}
}
if (has_opt) {
if (opt_namel) {
format(out, "\noptional arguments:\n");
for (auto &p: p_opts) {
if (p->type() != arg_type::OPTIONAL) {
@ -315,16 +369,28 @@ private:
}
auto &parg = static_cast<arg_optional &>(*p.get());
format(out, " ");
std::size_t nd = 0;
if (parg.p_sname) {
nd += 2;
format(out, "-%c", parg.p_sname);
if (!parg.p_lname.empty()) {
nd += 2;
format(out, ", ");
}
}
if (!parg.p_lname.empty()) {
nd += parg.p_lname.size() + 2;
format(out, "--%s", parg.p_lname);
}
out.put('\n');
if (parg.p_helpstr.empty()) {
out.put('\n');
} else {
nd = maxpad - nd + 2;
for (std::size_t i = 0; i < nd; ++i) {
out.put(' ');
}
format(out, "%s\n", parg.p_helpstr);
}
}
}
}
@ -368,7 +434,7 @@ private:
}
}
if (has_val) {
desc.set_value(val);
desc.set_values(iter({ val }));
if (arg_val) {
args.pop_front();
}
@ -414,7 +480,7 @@ private:
}
}
if (has_val) {
desc.set_value(val);
desc.set_values(iter({ val }));
if (arg_val) {
args.pop_front();
}