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#include "progress-bar.hh"
#include <iostream>
namespace nix {
ProgressBar::ProgressBar()
{
_writeToStderr = [&](const unsigned char * buf, size_t count) {
auto state_(state.lock());
assert(!state_->done);
std::cerr << "\r\e[K" << std::string((const char *) buf, count);
render(*state_);
};
}
ProgressBar::~ProgressBar()
{
done();
}
void ProgressBar::updateStatus(const std::string & s)
{
auto state_(state.lock());
assert(!state_->done);
state_->status = s;
render(*state_);
}
void ProgressBar::done()
{
auto state_(state.lock());
assert(state_->activities.empty());
state_->done = true;
std::cerr << "\r\e[K";
std::cerr.flush();
_writeToStderr = decltype(_writeToStderr)();
}
void ProgressBar::render(State & state_)
{
std::cerr << '\r' << state_.status;
if (!state_.activities.empty()) {
if (!state_.status.empty()) std::cerr << ' ';
std::cerr << *state_.activities.rbegin();
}
std::cerr << "\e[K";
std::cerr.flush();
}
ProgressBar::Activity ProgressBar::startActivity(const FormatOrString & fs)
{
return Activity(*this, fs);
}
ProgressBar::Activity::Activity(ProgressBar & pb, const FormatOrString & fs)
: pb(pb)
{
auto state_(pb.state.lock());
state_->activities.push_back(fs.s);
it = state_->activities.end(); --it;
pb.render(*state_);
}
ProgressBar::Activity::~Activity()
{
auto state_(pb.state.lock());
state_->activities.erase(it);
}
}
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