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// file : tests/progress/driver.cxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#ifndef _WIN32
# include <unistd.h> // write()
#else
# include <libbutl/win32-utility.hxx>
# include <io.h> //_write()
#endif
#include <string>
#include <cstddef> // size_t
#include <iostream>
#ifndef _WIN32
# include <thread> // this_thread::sleep_for()
#endif
#include <libbutl/process.hxx>
#include <libbutl/fdstream.hxx> // fdopen_null(), stderr_fd()
#include <libbutl/diagnostics.hxx>
#undef NDEBUG
#include <cassert>
using namespace std;
using namespace butl;
// Usage:
//
// argv[0] [-n] [-c]
//
// -n
// Do not run child process. By default the program runs itself with -c
// option (see below).
//
// -c
// Run as a child process that just prints lines with a small but varying
// delay.
//
int
main (int argc, const char* argv[])
{
bool child (false);
bool no_child (false);
assert (argc > 0);
for (int i (1); i != argc; ++i)
{
string v (argv[i]);
if (v == "-c")
child = true;
else if (v == "-n")
no_child = true;
else
assert (false);
}
auto sleep = [] (size_t ms = 100)
{
// MINGW GCC 4.9 doesn't implement this_thread so use Win32 Sleep().
//
#ifndef _WIN32
this_thread::sleep_for (chrono::milliseconds (ms));
#else
Sleep (static_cast<DWORD> (ms));
#endif
};
if (child)
{
auto print = [] (const string& s)
{
#ifndef _WIN32
ssize_t r (write (stderr_fd(), s.c_str (), s.size ()));
#else
int r (_write (stderr_fd(),
s.c_str (),
static_cast<unsigned int> (s.size ())));
#endif
assert (r != -1);
};
for (size_t i (50); i != 0; --i)
{
print ("Child line " + to_string (i) + '\n');
sleep (200 - i);
}
return 0;
}
process pr (!no_child
? process_start (fdopen_null (), fdopen_null (), 2,
argv[0], "-c")
: process (process_exit (0))); // Exited normally.
for (size_t i (100); i != 0; --i)
{
if (i % 10 == 0)
diag_stream_lock () << "Line " << i / 10 << endl;
{
diag_progress_lock l;
diag_progress = " " + to_string (i) + "%";
}
sleep ();
}
sleep (1000);
// Test that the progress line is restored by the diag_stream_lock.
//
diag_stream_lock () << "Printed to diag_stream" << endl;
sleep (1000);
// Test that the progress line is restored after printing to cerr.
//
{
cerr << "Printed to std::cerr" << endl;
diag_progress_lock ();
}
sleep (1000);
assert (pr.wait ());
}
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