Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
#include <string>
#include <algorithm>
#include <vector>
#include <tuple>
#include <iostream>
#include <optional>
void usage(const std::string& progName) {
std::cout << progName << " -X FILE -P FILE -O DIRECTORY " << std::endl
<< "Options:" << std::endl
<< "-h | --help Print this help" << std::endl
<< "-X Path to X file" << std::endl
<< "-P Path to P file" << std::endl
<< "-O Path to output directory." << std::endl;
}
class cmdline_args_parser{
public:
cmdline_args_parser (const int argc, char **argv){
for (int i=0; i < argc; ++i)
tokens.push_back(std::string(argv[i]));
}
const std::optional<std::string> getCmdOption(const std::string &option) const{
auto itr = std::find(tokens.begin(), tokens.end(), option);
if (itr != tokens.end() && ++itr != tokens.end())
return std::optional(*(itr));
return std::nullopt;
}
template<typename... Options>
const auto get_all_options(const Options... ops) const{
std::vector<std::optional<std::string>> v;
(v.push_back(getCmdOption(ops)), ...);
return v;
}
bool cmdOptionExists(const std::string &option) const{
return
std::find(tokens.begin(), tokens.end(), option) != tokens.end();
}
template<typename... Options>
bool all_options_exists(const Options... opts) const{
return (... && cmdOptionExists(opts));
}
template<typename... Options>
bool any_options_exists(const Options... opts) const{
return (... || cmdOptionExists(opts));
}
const std::string& get_program_name() const{ return tokens[0]; }
private:
std::vector<std::string> tokens;
};
auto process_args(const cmdline_args_parser& p){
auto opts = p.get_all_options("-X","-O","-P");
if(p.any_options_exists("-h", "--help") ||
!all_of(begin(opts), end(opts), [](const auto& x ){return x;}) )
{
usage(p.get_program_name());
return;
}
for(const auto opt : opts){
std::cout<<opt.value()<<std::endl;
}
}
int main(int argc, char** argv){
cmdline_args_parser p (argc, argv);
process_args(p);
return 0;
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.