Add option to download files using file id

include/config.h

@@ -65,10 +65,11 @@ class Config
         std::string sLanguagePackSubdir;
         std::string sDLCSubdir;
         std::string sGameSubdir;
-	std::string sLanguagePriority;
+        std::string sFileIdString;
-	std::string sPlatformPriority;
+        std::string sLanguagePriority;
-	std::vector<unsigned int> vLanguagePriority;
+        std::string sPlatformPriority;
-	std::vector<unsigned int> vPlatformPriority;
+        std::vector<unsigned int> vLanguagePriority;
+        std::vector<unsigned int> vPlatformPriority;
 
         unsigned int iInstallerType;
         unsigned int iInstallerLanguage;

include/downloader.h

@@ -67,6 +67,7 @@ class Downloader
         void checkOrphans();
         void checkStatus();
         void updateCache();
+        void downloadFileWithId(const std::string& fileid_string);
         CURL* curlhandle;
         Timer timer;
         Config config;

main.cpp

@@ -150,6 +150,7 @@ int main(int argc, char *argv[])
             ("no-cover", bpo::value<bool>(&bNoCover)->zero_tokens()->default_value(false), "Don't download cover images. Overrides --cover option.\nUseful for making exceptions when \"cover\" is set to true in config file.")
             ("update-cache", bpo::value<bool>(&config.bUpdateCache)->zero_tokens()->default_value(false), "Update game details cache")
             ("no-platform-detection", bpo::value<bool>(&bNoPlatformDetection)->zero_tokens()->default_value(false), "Don't try to detect supported platforms from game shelf.\nSkips the initial fast platform detection and detects the supported platforms from game details which is slower but more accurate.\nUseful in case platform identifier is missing for some games in the game shelf.\nUsing --platform with --list doesn't work with this option.")
+            ("download-file", bpo::value<std::string>(&config.sFileIdString)->default_value(""), "Download a single file using fileid\nFormat: \"gamename/fileid\"\nThis option ignores all subdir options. The file is downloaded to directory specified with --directory option.")
         ;
         // Commandline options (config file)
         options_cli_cfg.add_options()
@@ -512,6 +513,8 @@ int main(int argc, char *argv[])
         downloader.updateCache();
     else if (config.bUpdateCheck) // Update check has priority over download and list
         downloader.updateCheck();
+    else if (!config.sFileIdString.empty())
+        downloader.downloadFileWithId(config.sFileIdString);
     else if (config.bRepair) // Repair file
         downloader.repair();
     else if (config.bDownload) // Download games

src/downloader.cpp

@@ -90,7 +90,7 @@ int Downloader::init()
 
     // updateCheck() calls getGameList() if needed
     // getGameList() is not needed when using cache unless we want to list games from account
-    if ( !config.bUpdateCheck && (!config.bUseCache || (config.bUseCache && config.bList)) )
+    if ( !config.bUpdateCheck && (!config.bUseCache || (config.bUseCache && config.bList)) && config.sFileIdString.empty() )
         this->getGameList();
 
     if (config.bReport && (config.bDownload || config.bRepair))
@@ -3076,3 +3076,42 @@ void Downloader::saveSerials(const std::string& serials, const std::string& file
 
     return;
 }
+
+void Downloader::downloadFileWithId(const std::string& fileid_string)
+{
+    size_t pos = fileid_string.find("/");
+    if (pos == std::string::npos)
+    {
+        std::cout << "Invalid file id " << fileid_string << ": could not find separator \"/\"" << std::endl;
+    }
+    else
+    {
+        std::string gamename, fileid, url;
+        gamename.assign(fileid_string.begin(), fileid_string.begin()+pos);
+        fileid.assign(fileid_string.begin()+pos+1, fileid_string.end());
+
+        if (fileid.find("installer") != std::string::npos)
+            url = gogAPI->getInstallerLink(gamename, fileid);
+        else if (fileid.find("patch") != std::string::npos)
+            url = gogAPI->getPatchLink(gamename, fileid);
+        else
+            url = gogAPI->getExtraLink(gamename, fileid);
+
+        if (!gogAPI->getError())
+        {
+            std::string filename, filepath;
+            filename.assign(url.begin()+url.find_last_of("/")+1, url.begin()+url.find_first_of("?"));
+            filepath = Util::makeFilepath(config.sDirectory, filename, gamename);
+            std::cout << "Downloading: " << filepath << std::endl;
+            this->downloadFile(url, filepath, std::string(), gamename);
+            std::cout << std::endl;
+        }
+        else
+        {
+            std::cout << gogAPI->getErrorMessage() << std::endl;
+            gogAPI->clearError();
+        }
+    }
+
+    return;
+}