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#pragma once
#include <cstdio>
#include <string>
#include <vector>
#include <map>
using namespace std;
#define NO_PARAM(h) (CmdOption(false, h))
#define HAS_PARAM(h) (CmdOption(true, h))
class CmdOption
{
public:
CmdOption(bool has_param, string help) :
m_has_param(has_param), m_help(help), m_is_set(false) { }
bool has_param() const { return m_has_param; }
const string& help() const { return m_help; }
void oset() { m_is_set = true; }
void pset(const string& p) { m_param = p; oset(); }
bool is_set() const { return m_is_set; }
const string& param() const { return m_param; }
private:
bool m_has_param;
string m_help;
bool m_is_set;
string m_param;
};
class CmdOptions
{
public:
CmdOptions(int argc, char **argv, map<string, CmdOption>& opts) :
m_opts(opts), m_cmd(argv[0]) {
for (int i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
auto ii = m_opts.find(&argv[i][1]);
if (ii == m_opts.end()) {
m_error += m_cmd + ": " +
string(argv[i]) +
": unknown option\n";
continue;
}
if ((*ii).second.has_param()) {
if (++i == argc) {
m_error += m_cmd + ": -" +
(*ii).first +
": parameter missing\n";
continue;
}
(*ii).second.pset(argv[i]);
} else {
(*ii).second.oset();
}
} else {
m_params.push_back(argv[i]);
}
}
}
const string& error() const { return m_error; }
const string& cmd() const { return m_cmd; }
bool is_set(const string& name) const {
return m_opts.at(name).is_set();
}
const string& opt_param(const string& name) const {
return m_opts.at(name).param();
}
const vector<string>& params() const { return m_params; }
CmdOption& get_option(const string& name) { return m_opts.at(name); }
int num_options() const {
int ret(0);
for (const auto& p : m_opts)
if (p.second.is_set())
ret++;
return ret;
}
const string usage() const {
string ret("usage:\n");
for (const auto& p : m_opts)
ret += "-" + p.first +
(p.second.has_param() ? " <>: " : ": ") +
p.second.help() + "\n";
return ret;
}
private:
map<string, CmdOption>& m_opts;
string m_cmd;
vector<string> m_params;
string m_error;
};
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