08. util.h

You can try experimenting with the output from functions defined within util.h in the notebook below.

#include <string>
#include <fstream>

// Classic helper functions
class Util {
    public:
        static std::string convertToTime ( long int input_seconds );
        static std::string getProgressBar(std::string percent);
        static std::ifstream getStream(std::string path);
};

std::string Util::convertToTime (long int input_seconds)
{
    long minutes = input_seconds / 60;
    long hours = minutes / 60;
    long seconds = int(input_seconds%60);
    minutes = int(minutes%60);
    std::string result = std::to_string(hours) + ":" + std::to_string(minutes) + ":" + std::to_string(seconds);
    return result;
}

// constructing string for given percentage
// 50 bars is uniformly streched 0 - 100 %
// meaning: every 2% is one bar(|)
std::string Util::getProgressBar(std::string percent)
{
    std::string result = "0% ";
    int _size= 50;
    int  boundaries = (stof(percent)/100)*_size;

    for (int i=0;i<_size;i++) {
        if (i<=boundaries) {
            result +="|";
        }
        else {
            result +=" ";
        }
    }

    result +=" " + percent.substr(0,5) + " /100%";
    return result;
}

// wrapper for creating streams
std::ifstream Util::getStream(std::string path)
{
    std::ifstream stream(path);
    if  (!stream) {
        throw std::runtime_error("Non - existing PID");
    }
    return stream;
}