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#include <chrono>
#include <iostream>
#include <set>
#include <sstream>
#include <string>
#include <thread>
#include <cctype>
#include <cstdlib>
std::string getStdin()
{
char buffer[1024];
std::ostringstream str;
do {
std::cin.read(buffer, 1024);
str.write(buffer, std::cin.gcount());
} while (std::cin.gcount() > 0);
return str.str();
}
int main(int argc, char** argv)
{
if (argc < 2) {
return -1;
}
std::string command = argv[1];
if (command == "echo") {
std::this_thread::sleep_for(std::chrono::milliseconds(3000));
std::cout << "HELLO world!" << std::flush;
std::cerr << "1" << std::flush;
return 0;
}
if (command == "capitalize") {
std::this_thread::sleep_for(std::chrono::milliseconds(9000));
std::string input = getStdin();
for (auto& c : input) {
c = static_cast<char>(std::toupper(c));
}
std::cout << input << std::flush;
std::cerr << "2" << std::flush;
return 1;
}
if (command == "dedup") {
// Use a nested scope to free all resources before aborting below.
{
std::string input = getStdin();
std::set<char> seen;
std::string output;
for (auto c : input) {
if (!seen.count(c)) {
seen.insert(c);
output += c;
}
}
std::cout << output << std::flush;
std::cerr << "3" << std::flush;
}
// On Windows, the exit code of abort() is different between debug and
// release builds, and does not yield a term_signal in libuv in either
// case. For the sake of simplicity, we just return another non-zero code.
#ifdef _WIN32
return 2;
#else
std::abort();
#endif
}
return -1;
}
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