Added operating system switch (#24)

* Added operating system switch

* Fix typo and throw error if both -os and -all-platforms are specified

DepotDownloader/ContentDownloader.cs

@@ -369,7 +369,7 @@ namespace DepotDownloader
             steam3.Disconnect();
         }
 
-        public static void DownloadApp( uint appId, uint depotId, string branch, bool forceDepot = false )
+        public static void DownloadApp( uint appId, uint depotId, string branch, string os = null, bool forceDepot = false )
         {
             if ( steam3 != null )
                 steam3.RequestAppInfo( appId );
@@ -420,7 +420,7 @@ namespace DepotDownloader
                             if ( depotConfig != KeyValue.Invalid && depotConfig[ "oslist" ] != KeyValue.Invalid && !string.IsNullOrWhiteSpace( depotConfig[ "oslist" ].Value ) )
                             {
                                 var oslist = depotConfig[ "oslist" ].Value.Split( ',' );
-                                if ( Array.IndexOf( oslist, Util.GetSteamOS() ) == -1 )
+                                if ( Array.IndexOf( oslist, os ?? Util.GetSteamOS() ) == -1 )
                                     continue;
                             }
                         }

DepotDownloader/Program.cs

@@ -94,7 +94,14 @@ namespace DepotDownloader
             ContentDownloader.Config.MaxServers = GetParameter<int>( args, "-max-servers", 20 );
             ContentDownloader.Config.MaxDownloads = GetParameter<int>( args, "-max-downloads", 4 );
             string branch = GetParameter<string>( args, "-branch" ) ?? GetParameter<string>( args, "-beta" ) ?? "Public";
-            var forceDepot = HasParameter( args, "-force-depot" );
+            bool forceDepot = HasParameter( args, "-force-depot" );
+            string os = GetParameter<string>( args, "-os", null );
+
+            if ( ContentDownloader.Config.DownloadAllPlatforms && !String.IsNullOrEmpty( os ) )
+            {
+                Console.WriteLine( "Error: Cannot specify -os when -all-platforms is specified." );
+                return;
+            }
 
             ContentDownloader.Config.MaxServers = Math.Max( ContentDownloader.Config.MaxServers, ContentDownloader.Config.MaxDownloads );
 
@@ -114,7 +121,7 @@ namespace DepotDownloader
 
             if ( ContentDownloader.InitializeSteam3( username, password ) )
             {
-                ContentDownloader.DownloadApp( appId, depotId, branch, forceDepot );
+                ContentDownloader.DownloadApp( appId, depotId, branch, os, forceDepot );
                 ContentDownloader.ShutdownSteam3();
             }
         }
@@ -166,6 +173,7 @@ namespace DepotDownloader
             Console.WriteLine( "\t-password <pass>\t\t\t- the password of the account to login to for restricted content." );
             Console.WriteLine( "\t-remember-password\t\t\t- if set, remember the password for subsequent logins of this user." );
             Console.WriteLine( "\t-dir <installdir>\t\t\t- the directory in which to place downloaded files." );
+            Console.WriteLine( "\t-os <os>\t\t\t- the operating system for which to download the game (windows, macos or linux, default: OS the program is currently running on)" );
             Console.WriteLine( "\t-filelist <filename.txt>\t\t- a list of files to download (from the manifest). Can optionally use regex to download only certain files." );
             Console.WriteLine( "\t-all-platforms\t\t\t- downloads all platform-specific depots when -app is used." );
             Console.WriteLine( "\t-manifest-only\t\t\t- downloads a human readable manifest for any depots that would be downloaded." );

README.md

@@ -16,6 +16,7 @@ Optional Parameters:
   -password <pass>       - the password of the account to login to for restricted content.
   -remember-password     - if set, remember the password for subsequent logins of this user.
   -dir <installdir>      - the directory in which to place downloaded files.
+  -os <os>               - the operating system for which to download the game (windows, macos or linux, default: OS the program is currently running on)
   -filelist <file.txt>   - a list of files to download (from the manifest).
                            Can optionally use regex to download only certain files.
   -all-platforms         - downloads all platform-specific depots when -app is used.