cs-lab34/main.cpp

#include <iostream>
#include <vector>
#include "histogram.h"
#include "text.h"
#include "svg.h"
#include <curl/curl.h>
#include <sstream>
#include <string>

using namespace std;

struct Input
{
    vector<double> numbers;
    size_t bin_count{};
};

Input input_data(istream& inp, bool prompt)
{
    Input in;
    size_t number_count;

    if(prompt)
    {
        cerr << "Enter number_count: ";
    }
    inp >> number_count;

    in.numbers.resize(number_count);

    for (size_t i = 0; i < number_count; i++)
    {
        inp >> in.numbers[i];
    }

    if(prompt)
    {
        cerr << "Enter bin_count: ";
    }
    inp >> in.bin_count;

    return in;
}

size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx)
{
    size_t data_size = item_count * item_size;
    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
    char* item = reinterpret_cast<char *>(items);
    buffer->write(item, data_size);
    return data_size;
}

Input download(const string& address)
{
    stringstream buffer;

    CURL* curl = curl_easy_init();

    if(curl)
    {
        CURLcode res;
        double time;

        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
        res = curl_easy_perform(curl);
        curl_easy_cleanup(curl);
        if (res == CURLE_OK)
        {
            res = curl_easy_getinfo(curl, CURLINFO_STARTTRANSFER_TIME, &time);
            if (CURLE_OK == res)
            {
                cerr<<"Time to connect: " << time;
            }
        }

        curl_easy_cleanup(curl);

        return input_data(buffer, false);
    }
}

int main(int argc, char* argv[])
{
    Input input;
    if (argc > 1)
    {
        input = download(argv[1]);
    }
    else
    {
        input = input_data(cin, true);
    }

    const auto bins = make_histogram(input.numbers, input.bin_count);
    show_histogram_svg(bins);
    return 0;
}