Add openclonk:// protocol handler (#1657)

docs/sdk/cmdline.xml

@@ -56,7 +56,7 @@
       <dd>
         <text>Searches for a network game on the specified address and joins it. No local scenario (*.ocs) should be specified. Implies --network.</text>
       </dd>
-      <dt id="clonkp">clonk://&lt;<em>Address</em>&gt;/</dt>
+      <dt id="clonkp">[open]clonk://&lt;<em>Address</em>&gt;/</dt>
       <dd>
         <text>Same as --join if an address is specified. If "update" is specified as an address, this will cause the engine to perform an update check instead.</text>
       </dd>

openclonk.desktop

@@ -9,4 +9,4 @@ Icon=openclonk
 Exec=openclonk
 Categories=Game;ActionGame;StrategyGame;ArcadeGame;
 StartupNotify=true
-MimeType=x-scheme-handler/clonk;
+MimeType=x-scheme-handler/clonk;x-scheme-handler/openclonk;

src/game/C4Application.cpp

@@ -428,10 +428,10 @@ void C4Application::ParseCommandLine(int argc, char * argv[])
 			Game.RecordStream.Copy(szParameter);
 		}
 		// Direct join by URL
-		if (SEqual2NoCase(szParameter, "clonk:"))
+		if (SEqual2NoCase(szParameter, "clonk:") || SEqual2NoCase(szParameter, "openclonk:"))
 		{
 			// Store address
-			SCopy(szParameter + 6, Game.DirectJoinAddress, _MAX_PATH);
+			SCopy(SAdvancePast(szParameter, ':'), Game.DirectJoinAddress, _MAX_PATH);
 			SClearFrontBack(Game.DirectJoinAddress, '/');
 			// Special case: if the target address is "update" then this is used for update initiation by url
 			if (SEqualNoCase(Game.DirectJoinAddress, "update"))