work with CURL

main.cpp

@@ -2,6 +2,8 @@
 #include "histogram.h"
 #include "svg.h"
 #include <vector>
+#include <curl/curl.h>
+#include <sstream>
 
 using namespace std;
 
@@ -11,17 +13,20 @@ struct Input
     size_t bin_count{};
 };
 
-Input input_data(istream& sin, bool prompt)
+Input input_data(istream& sin, bool prompt = true)
 {
     if (prompt){
         Input in;
         size_t number_count;
+        cerr << "Input number count" << endl;
         sin >> number_count;
         in.numbers.resize(number_count);
         for (size_t i = 0; i < number_count; i++)
         {
+            cerr << "Input number "<< i << endl;
             sin >> in.numbers[i];
         }
+        cerr << "Input bin count" << endl;
         sin >> in.bin_count;
         return in;
     }
@@ -39,9 +44,69 @@ Input input_data(istream& sin, bool prompt)
     }
 }
 
-int main() {
-    Input in = input_data(cin, false);
+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) {
+        CURLcode res;
+        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);
+        if (res != CURLE_OK) {
+            cout << curl_easy_strerror(res);
+            exit(1);
+        }
+        curl_easy_cleanup(curl);
+    }
+    return input_data(buffer, false);
+}
+
+int main(int argc, char* argv[]) {
+    Input in;
+    string link, color = "";
+    bool flag = false;
+    if (argc == 2) {
+        in = download(argv[1]);
+    }
+    else if (argc == 3) {
+        cout << "Wrong argument, use correct input -stroke <color> or leave input empty" << endl;
+        exit(2);
+    }
+    else if (argc > 3) {
+        for (size_t i = 1; i < argc; i++) {
+            string cur = argv[i];
+            if (cur.find("://") != string::npos) {
+                link = cur;
+            }
+            else if (i != argc - 1){
+                string curm = argv[i+1];
+                if (cur == "-stroke" && curm.find("://") == string::npos) {
+                    flag = true;
+                    color = curm;
+                }
+            }
+            else if (cur == "-stroke" && i == (argc - 1)) {
+                cout << "Wrong argument, use correct input -stroke <color> or leave input empty" << endl;
+                exit(2);
+            }
+        }
+        in = download(link);
+    }
+    else {
+        in = input_data(cin, false);
+    }
     auto bins = make_histogram(in.numbers, in.bin_count);
-    show_histogram_svg(bins);
+    show_histogram_svg(bins, color);
     return 0;
 }

svg.cpp

@@ -31,16 +31,18 @@ svg_text(double left, double baseline, string text) {
     cout << "<text x='" << left << "' y='" << baseline<< "'>" << text << "</text>";
 }
 
-void svg_rect(double x, double y, double width, double height, string stroke = "black", string fill = "black"){
+void 
+svg_rect(double x, double y, double width, double height, string stroke = "black", string fill = "black"){
     cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height << "' stroke='" << stroke << "' fill='" << fill << "' />";
 }
 
-
 void
-show_histogram_svg(const vector<size_t>& bins) {
+show_histogram_svg(const vector<size_t>& bins, string stcolor) {
     double max = 0;
     int maxlen = IMAGE_WIDTH - TEXT_WIDTH;
+    int bnumber = 0;
     for (auto el: bins) {
+        bnumber++;
         if (max < el) {
             max = el;
         }
@@ -49,6 +51,11 @@ show_histogram_svg(const vector<size_t>& bins) {
 
     svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);
     string stroke[] = {"red", "green", "blue"};
+    if (stcolor != "") {
+        for (int i = 0; i < bnumber; i++){
+            stroke[i] = stcolor;
+        }
+    }
     string fill[] = {"red", "green", "blue"};
     int i = 0;
     double top = 0;