cs-lab34/main.cpp

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

using namespace std;

struct Input{
    vector<double> numbers;
    size_t bin_count{};
};
Input
input_data(istream& in, bool prompt=false)
{
    Input inn;
    size_t number_count;
    if (prompt){
        cerr << "Enter count, numbers and bin_count\n";
    }
    in >> number_count;
    inn.numbers.resize(number_count);

    vector<double> numbers(number_count);
    for (size_t i=0; i< number_count; i++) {
        in >> inn.numbers[i];
    }
    in >> inn.bin_count;
    return inn;
}

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

Input download(const string& address) {
    stringstream buffer;
    CURL* curl = curl_easy_init();
    if (curl) {
        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());

        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);

        CURLcode res = curl_easy_perform(curl);
        if (res != CURLE_OK) {
            cerr << "cURL error: " << curl_easy_strerror(res) << endl;
            curl_easy_cleanup(curl);
            exit(1);
        }
        curl_easy_cleanup(curl);
    }
    else {
        cerr << "curl_easy_init() failed" << endl;
        exit(1);
    }
    return input_data(buffer, false);
}

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

    const auto bins = make_histogram(inn.numbers, inn.bin_count);
    show_histogram_svg(bins);

    return 0;
}