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#include <algorithm>
#include <unistd.h>
#include <getopt.h>
#include "opts.h"
using namespace std;
Option::Option(const string& str, function<void()> func)
: m_void_func(func)
{
parse(str);
}
Option::Option(const string& str, function<void(const string)> func)
: m_func(func)
{
parse(str);
}
void Option::parse(const string& str)
{
auto iend = str.end();
if (*(iend - 1) == '=') {
iend--;
m_has_arg = 1;
} else if (*(iend - 1) == '?') {
iend--;
m_has_arg = 2;
} else {
m_has_arg = 0;
}
auto isplit = find(str.begin(), iend, '|');
if (isplit != str.begin())
m_short = str[0];
else
m_short = 0;
if (isplit != iend)
m_long = string(isplit + 1, iend);
}
OptionSet::OptionSet(initializer_list<Option> il)
: m_opts(il)
{
}
void OptionSet::parse(int argc, char** argv)
{
string shortopts = ":";
vector<struct option> longopts;
for (unsigned opt_idx = 0; opt_idx < m_opts.size(); ++opt_idx) {
const Option& o = m_opts[opt_idx];
if (o.m_short != 0) {
shortopts.push_back(o.m_short);
if (o.m_has_arg == 1)
shortopts.push_back(':');
else if (o.m_has_arg == 2)
shortopts.append("::");
}
if (!o.m_long.empty()) {
struct option copt;
copt.name = o.m_long.c_str();
copt.has_arg = o.m_has_arg;
copt.flag = 0;
copt.val = opt_idx + 1000;
longopts.push_back(copt);
}
}
longopts.push_back(option {});
while (1) {
int long_idx = 0;
int c = getopt_long(argc, argv, shortopts.c_str(),
longopts.data(), &long_idx);
if (c == -1)
break;
if (c == '?')
throw std::invalid_argument(string("Unrecognized option ") + argv[optind - 1]);
if (c == ':') {
const Option& o = find_opt(optopt);
if (optopt < 256)
throw std::invalid_argument(string("Missing argument to -") + o.m_short);
else
throw std::invalid_argument(string("Missing argument to --") + o.m_long);
}
string sarg = { optarg ?: "" };
const Option& opt = find_opt(c);
if (opt.m_func)
opt.m_func(sarg);
else
opt.m_void_func();
}
for (int i = optind; i < argc; ++i)
m_params.push_back(argv[i]);
}
const Option& OptionSet::find_opt(int c)
{
if (c < 256)
return *find_if(m_opts.begin(), m_opts.end(), [c](const Option& o) { return o.m_short == c; });
else
return m_opts[c - 1000];
}
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