lemma_mirror/Modules/LemmaCore/src/ProgressBar.cpp

#include "ProgressBar.h"
#include <iostream>
#include <iomanip>
#include <sstream>

#define LENGTH_OF_PROGRESS_BAR 55
#define PERCENTAGE_BIN_SIZE (100.0/LENGTH_OF_PROGRESS_BAR)

namespace
{
    std::string generateProgressBar(unsigned int percentage)
    {
        const int progress = static_cast<int>(percentage/PERCENTAGE_BIN_SIZE);
        std::ostringstream ss;
        ss << " " << std::setw(3) << std::right << percentage << "% ";
        std::string bar("[" + std::string(LENGTH_OF_PROGRESS_BAR-2, ' ') + "]");

        unsigned int numberOfSymbols = std::min(
                std::max(0, progress - 1),
                LENGTH_OF_PROGRESS_BAR - 2);

        bar.replace(1, numberOfSymbols, std::string(numberOfSymbols, '|'));

        ss << bar;
        return ss.str();
    }
}

ProgressBar::ProgressBar(
            uint32_t expectedIterations, const std::string& initialMessage)
    : mTotalIterations(expectedIterations),
      mNumberOfTicks(0),
      mEnded(false)
{
    std::cout << initialMessage << "\n";
    mLengthOfLastPrintedMessage = initialMessage.size();
    std::cout << generateProgressBar(0) << "\r" << std::flush;
}

ProgressBar::~ProgressBar()
{
    endProgressBar();
}

void ProgressBar::operator++()
{
    if (mEnded)
    {
        throw std::runtime_error(
                "Attempted to use progress bar after having terminated it");
    }

    mNumberOfTicks = std::min(mTotalIterations, mNumberOfTicks+1);
    const unsigned int percentage = static_cast<unsigned int>(
            mNumberOfTicks*100.0/mTotalIterations);

    std::cout << generateProgressBar(percentage) << "\r" << std::flush;
}

void ProgressBar::printNewMessage(const std::string& message)
{
    if (mEnded)
    {
        throw std::runtime_error(
                "Attempted to use progress bar after having terminated it");
    }

    std::cout << "\r"
        << std::left
        << std::setw(LENGTH_OF_PROGRESS_BAR + 6)
        << message << "\n";
    mLengthOfLastPrintedMessage = message.size();
    const unsigned int percentage = static_cast<unsigned int>(
            mNumberOfTicks*100.0/mTotalIterations);

    std::cout << generateProgressBar(percentage) << "\r" << std::flush;

}

void ProgressBar::updateLastPrintedMessage(const std::string& message)
{
    if (mEnded)
    {
        throw std::runtime_error(
                "Attempted to use progress bar after having terminated it");
    }

    std::cout << "\r\033[F"
        << std::left
        << std::setw(mLengthOfLastPrintedMessage)
        << message << "\n";
    mLengthOfLastPrintedMessage = message.size();
}

void ProgressBar::endProgressBar()
{
    if (!mEnded)
    {
        std::cout << std::string(2, '\n');
    }
    mEnded = true;
}