Add implementation

src/main.cpp

@@ -2,7 +2,10 @@
 #include <cstdlib>
 #include <string>
 #include <stdexcept>
+#include <sstream>
+#include <regex>
 #include <getopt.h>
+#include <libscrequest.hpp>
 #include "version.hpp"
 
 void print_help() {
@@ -48,7 +51,17 @@ int main(int argc, char* argv[]) {
                 std::cerr << "gitlabvers: " << ex.what() << '\n';
             }
         }
-        std::cout << "hello, gitlabvers\n";
+        sc::requester req;
+        std::istringstream text {req.get("https://gitlab.com/gitlab-org/gitlab-foss/-/raw/master/CHANGELOG.md")};
+        std::string line;
+        for (size_t i = 0; i < 5; ++i) {
+            std::getline(text, line);
+        }
+        std::regex pat {R"(\d+\.\d+\.\d+)"};
+        std::smatch match;
+        if (std::regex_search(line, match, pat)) {
+            std::cout << match[0] << '\n';
+        }
     } catch (const std::exception& ex) {
         std::cerr << "gitlabvers: " << ex.what() << '\n';
         return EXIT_FAILURE;