#include <matplot/util/popen.h>

#ifdef _WIN32

#include <io.h>

namespace matplot::detail {

// Function to create a new process and return a FILE pointer for

// input/output. Mimics _popen behaviour, but does not open console windows

// in GUI apps

FILE *hiddenPopen(const char *command, const char *mode) {

SECURITY_ATTRIBUTES saAttr;

HANDLE hChildStdinRd, hChildStdinWr, hStdin, hStdout;

STARTUPINFO si;

PROCESS_INFORMATION pi;

// Set up security attributes for inheritable handles

saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);

saAttr.bInheritHandle = TRUE;

saAttr.lpSecurityDescriptor = NULL;

// Create a pipe for the child process's input

if (!CreatePipe(&hChildStdinRd, &hChildStdinWr, &saAttr, 0)) {

return nullptr;

}

// Ensure the write handle to the pipe is not inherited by child

// processes

if (!SetHandleInformation(hChildStdinWr, HANDLE_FLAG_INHERIT, 0)) {

CloseHandle(hChildStdinRd);

return nullptr;

}

// Create a pipe for the child process's output

if (!CreatePipe(&hStdin, &hStdout, &saAttr, 0)) {

CloseHandle(hChildStdinRd);

CloseHandle(hChildStdinWr);

return nullptr;

}

// Ensure the read handle to the output pipe is not inherited by child

// processes

if (!SetHandleInformation(hStdout, HANDLE_FLAG_INHERIT, 0)) {

CloseHandle(hChildStdinRd);

CloseHandle(hChildStdinWr);

CloseHandle(hStdin);

return nullptr;

}

// Configure STARTUPINFO structure for the new process

ZeroMemory(&si, sizeof(STARTUPINFO));

si.cb = sizeof(STARTUPINFO);

si.hStdError = hStdout;

si.hStdOutput = hStdout;

si.hStdInput = hChildStdinRd;

si.dwFlags |= STARTF_USESTDHANDLES;

// Create the child process, while hiding the window

if (!CreateProcess(NULL, const_cast<char *>(command), NULL, NULL, TRUE,

CREATE_NO_WINDOW, NULL, NULL, &si, &pi)) {

CloseHandle(hChildStdinRd);

CloseHandle(hChildStdinWr);

CloseHandle(hStdin);

CloseHandle(hStdout);

return nullptr;

}

// Close unnecessary handles

CloseHandle(hChildStdinRd);

CloseHandle(hStdout);

// Create a FILE pointer from the write handle to the child process's

// input

FILE *file = _fdopen(_open_osfhandle((intptr_t)hChildStdinWr, 0), mode);

if (file == nullptr) {

CloseHandle(hChildStdinWr);

CloseHandle(hStdin);

CloseHandle(pi.hProcess);

CloseHandle(pi.hThread);

return nullptr;

}

return file;

}

// Function to close the process and retrieve its exit code

int hiddenPclose(FILE *file) {

HANDLE hFile = (HANDLE)_get_osfhandle(_fileno(file));

fclose(file);

DWORD exitCode;

// Wait for the process to finish and get its exit code

if (WaitForSingleObject(hFile, INFINITE) == WAIT_OBJECT_0 &&

GetExitCodeProcess(hFile, &exitCode)) {

CloseHandle(hFile);

return exitCode;

} else {

return -1; // Failed to get the exit code

}

}

} // namespace matplot::detail

#endif // _WIN32