13 вариант исправленный

main.cpp

@@ -1,7 +1,6 @@
 #include <iostream>
 #include <vector>
 #include "histogram.h"
-#include "text.h"
 #include "svg.h"
 #include <curl/curl.h>
 #include <sstream>
@@ -36,7 +35,7 @@ size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx) {
     return data_size;
 }
 
-Input download(const string& address) {
+void download(const string& address, Input& input) {
     stringstream buffer;
     CURL* curl = curl_easy_init();
     if (curl) {
@@ -45,46 +44,52 @@ Input download(const string& address) {
         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
         CURLcode res = curl_easy_perform(curl);
         if (res != CURLE_OK) {
-            cerr << curl_easy_strerror(res);
+            cerr << "Error: " << curl_easy_strerror(res) << endl;
             exit(1);
         }
         curl_easy_cleanup(curl);
     }
-    return input_data(buffer, false);
+    Input loaded = input_data(buffer, false);
+    input.numbers = loaded.numbers;
+    input.bin_count = loaded.bin_count;
 }
 
-void process_args(int argc, char* argv[], Input& input) {
+void parse_args(int argc, char* argv[], Input& input, string& url) {
     for (int i = 1; i < argc; i++) {
-        if (string(argv[i]) == "-stroke") {
+        string arg = argv[i];
+        if (arg == "-stroke") {
             if (i + 1 < argc) {
-                input.stroke_color = argv[i + 1];
+                input.stroke_color = argv[i+1];
                 i++;
             } else {
-                cerr << "Error: trebueca one argument.\n";
+                cerr << "Error: require a color value" << endl;
                 exit(1);
             }
+        } else if (arg[0] != '-') {
+            url = arg;
+        } else {
+            cerr << "Error: Unknown option " << arg << endl;
+            exit(1);
         }
     }
 }
 
 int main(int argc, char* argv[]) {
+    curl_global_init(CURL_GLOBAL_ALL);
     Input input;
-    process_args(argc, argv, input);
-
-    bool url_provided = false;
-    for (int i = 1; i < argc; i++) {
-        if (string(argv[i]) != "-stroke" && argv[i][0] != '-') {
-            input = download(argv[i]);
-            url_provided = true;
-            break;
+    string url;
+    if (argc > 1) {
+        parse_args(argc, argv, input, url);
+        if (!url.empty()) {
+            download(url, input);
+        } else {
+            input = input_data(cin, true);
         }
-    }
-
-    if (!url_provided) {
+    } else {
         input = input_data(cin, true);
     }
-
-    auto bins = make_histogram(input.numbers, input.bin_count);
+    const auto bins = make_histogram(input.numbers, input.bin_count);
     show_histogram_svg(bins, input.stroke_color);
+    curl_global_cleanup();
     return 0;
 }