First version

Does not encode entry yet

main.cpp

@@ -1,6 +1,126 @@
 #include <iostream>
+#include <curl/curl.h>
+#include <getopt.h>
 
-int main(int argc, char **argv) {
-    std::cout << "Hello, world!" << std::endl;
-    return 0;
+#include "config.hpp"
+
+/* check version */
+#ifndef VERSION
+    #define VERSION "UNKNOWN"
+#endif
+
+static size_t WriteCallback(void *contents, size_t size, size_t nmemb, void *userp){
+    ((std::string*)userp)->append((char*)contents, size * nmemb);
+    return size * nmemb;
+}
+
+/**
+ * goal: ytsearch -h|-v|search-term
+ *
+ * @example ytsearch "rick astley"
+ *          https://www.youtube.com/watch?v=dQw4w9WgXcQ
+ */
+int main(int argc, char **argv)
+{
+    if (argc < 2)
+    {
+        std::cout << "ytsearch: a search term is needed, try 'ytsearch -h' for more information" << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    int opt;
+
+    std::string const video_url  = { "https://www.youtube.com/watch?v=" };
+    std::string search_url = { "https://www.youtube.com/results?search_query=" };
+
+    while ((opt = getopt(argc, argv, "hv")) != -1)
+    {
+        switch (opt)
+        {
+            case 'h':
+                std::cout << "Usage: ytsearch [options...] search-term" << std::endl <<
+                " -h: show this help and quit" << std::endl <<
+                " -v: show version number and quit" << std::endl <<
+                std::endl <<
+                "Retrieve the url of a youtube video matching the searched terms" << std::endl;
+                return EXIT_SUCCESS;
+            case 'v':
+                std::cout << VERSION << std::endl;
+                return EXIT_SUCCESS;
+            default:
+                std::cout << "ytsearch: try 'ytsearch -h' for more information" << std::endl;
+                return EXIT_FAILURE;
+        }
+    }
+
+    search_url += argv[1];
+
+    CURL *curl;
+    std::string readBuffer;
+
+    curl = curl_easy_init();
+
+    if (!curl)
+    {
+        std::cout << "ytsearch: error in curl initialization" << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    curl_easy_setopt(curl, CURLOPT_URL, search_url.c_str());
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
+    CURLcode res = { curl_easy_perform(curl) };
+    curl_easy_cleanup(curl);
+
+    if (res != 0)
+    {
+        std::cout << "ytsearch: error when fetching results: " << res << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    std::string paths[4] = {
+        "navigationEndpoint",
+        "commandMetadata",
+        "webCommandMetadata",
+        "url",
+    };
+
+    size_t pos_start = readBuffer.find("ytInitialData");
+    std::string const error_api = "ytsearch: error, youtube's api changed: update ytsearch";
+
+    if (pos_start == std::string::npos or pos_start == 0)
+    {
+        std::cout << error_api << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    size_t first_video = readBuffer.find("WEB_PAGE_TYPE_WATCH", pos_start);
+
+    if (first_video == std::string::npos or pos_start == 0)
+    {
+        std::cout << error_api << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    while (first_video > pos_start + 60) // type is defined a little after url, we want a video
+    {
+        for (std::string name : paths)
+        {
+            pos_start = { readBuffer.find(name, pos_start) };
+
+            if (pos_start == std::string::npos or pos_start == 0)
+            {
+                std::cout << error_api << std::endl;
+                return EXIT_FAILURE;
+            }
+        }
+    }
+
+    size_t size = { pos_start + 15 }; // size of " url":"/watch?v= ", last part of paths
+
+    size_t pos_end = { readBuffer.find('"', size) };
+
+    std::cout << video_url << readBuffer.substr(size, pos_end - size) << std::endl;
+
+    return EXIT_SUCCESS;
 }

meson.build

@@ -1,7 +1,7 @@
 project(
     'ytsearch',
     'cpp',
-    version : '1.0.0',
+    version : '0.1.0',
     default_options : [
         'buildtype=debug',
         'optimization=0',
@@ -10,8 +10,13 @@ project(
     meson_version: '>= 0.60.0',
 )
 
+conf_data = configuration_data()
+conf_data.set('version', meson.project_version())
+configure_file(input: 'config.hpp.in', output: 'config.hpp', configuration: conf_data)
+
 
 executable('ytsearch',
-           'main.cpp'
+           'main.cpp',
+           dependencies : dependency('libcurl')
 )