5 files changed, 55 insertions, 38 deletions
diff --git a/src/classes/UCommandLine.pas b/src/classes/UCommandLine.pas
index 3c56c606..8bdc4f5a 100644
--- a/src/classes/UCommandLine.pas
+++ b/src/classes/UCommandLine.pas
@@ -57,7 +57,6 @@ const
   cHelp            = 'help';
   cDebug           = 'debug';
   cMediaInterfaces = 'showinterfaces';
-  cUseLocalPaths   = 'localpaths';
 
 
 implementation
@@ -98,11 +97,7 @@ begin
   writeln( '  '+s( 'Switch' ) +' : Purpose' );
   writeln( '  ----------------------------------------------------------' );
   writeln( '  '+s( cMediaInterfaces ) + #9 + ' : Show in-use media interfaces' );
-  writeln( '  '+s( cUseLocalPaths ) + #9 + ' : Use relative paths' );
   writeln( '  '+s( cDebug ) + #9 + ' : Display Debugging info' );
-
-
-
   writeln( '' );
 
   platform.halt;
diff --git a/src/classes/UPlatform.pas b/src/classes/UPlatform.pas
index b71ac1b8..1dcdb5b9 100644
--- a/src/classes/UPlatform.pas
+++ b/src/classes/UPlatform.pas
@@ -25,6 +25,7 @@ type
   TDirectoryEntryArray = array of TDirectoryEntry;
 
   TPlatform = class
+    function GetExecutionDir(): string;
     procedure Init; virtual;
     function DirectoryFindFiles(Dir, Filter: WideString; ReturnAllSubDirs: boolean): TDirectoryEntryArray; virtual; abstract;
     function TerminateIfAlreadyRunning(var WndTitle : string): boolean; virtual;
@@ -81,6 +82,14 @@ begin
   System.Halt;
 end;
 
+{**
+ * Returns the directory of the executable
+ *}
+function TPlatform.GetExecutionDir(): string;
+begin
+  Result := ExtractFilePath(ParamStr(0));
+end;
+
 (**
  * Default TerminateIfAlreadyRunning() implementation
  *)
diff --git a/src/classes/UPlatformLinux.pas b/src/classes/UPlatformLinux.pas
index 19361a22..3227e4f8 100644
--- a/src/classes/UPlatformLinux.pas
+++ b/src/classes/UPlatformLinux.pas
@@ -16,8 +16,13 @@ uses
 type
   TPlatformLinux = class(TPlatform)
     private
+      UseLocalDirs: boolean;
+
+      procedure DetectLocalExecution();
       function GetHomeDir(): string;
     public
+      procedure Init; override;
+
       function DirectoryFindFiles(Dir, Filter: WideString; ReturnAllSubDirs: Boolean): TDirectoryEntryArray; override;
 
       function GetLogPath        : WideString; override;
@@ -36,6 +41,34 @@ uses
   SysUtils,
   ULog;
 
+procedure TPlatformLinux.Init;
+begin
+  inherited Init();
+  DetectLocalExecution();
+end;
+
+{**
+ * Detects whether the game was executed locally or globally.
+ * - It is local if it was not installed and directly executed from
+ *   within the game folder. In this case resources (themes, language-files)
+ *   reside in the directory of the executable.
+ * - It is global if the game was installed (e.g. to /usr/bin) and
+ *   the resources are in a separate folder (e.g. /usr/share/ultrastardx)
+ *   which name is stored in the INSTALL_DATADIR constant in config-linux.inc.
+ *
+ * Sets UseLocalDirs to true if the game is executed locally, false otherwise.
+ *}
+procedure TPlatformLinux.DetectLocalExecution();
+var
+  LocalDir: string;
+begin
+  LocalDir := GetExecutionDir();
+  
+  // we just check if the 'languages' folder exists in the
+  // directory of the executable. If so -> local execution.
+  UseLocalDirs := (DirectoryExists(LocalDir + 'languages'));
+end;
+
 function TPlatformLinux.DirectoryFindFiles(Dir, Filter: WideString; ReturnAllSubDirs: Boolean): TDirectoryEntryArray;
 var
   i: Integer;
@@ -81,18 +114,10 @@ end;
 
 function TPlatformLinux.GetLogPath: WideString;
 begin
-  if FindCmdLineSwitch( cUseLocalPaths ) then
-  begin
-    Result := ExtractFilePath(ParamStr(0));
-  end
+  if UseLocalDirs then
+    Result := GetExecutionDir()
   else
-  begin
-    {$IFDEF UseLocalDirs}
-      Result := ExtractFilePath(ParamStr(0));
-    {$ELSE}
-      Result := GetGameUserPath() + 'logs/';
-    {$ENDIF}
-  end;
+    Result := GetGameUserPath() + 'logs/';
 
   // create non-existing directories
   ForceDirectories(Result);
@@ -100,35 +125,23 @@ end;
 
 function TPlatformLinux.GetGameSharedPath: WideString;
 begin
-  if FindCmdLineSwitch( cUseLocalPaths ) then
-    Result := ExtractFilePath(ParamStr(0))
+  if UseLocalDirs then
+    Result := GetExecutionDir()
   else
-  begin
-    {$IFDEF UseLocalDirs}
-    Result := ExtractFilePath(ParamStr(0));
-    {$ELSE}
     Result := IncludeTrailingPathDelimiter(INSTALL_DATADIR);
-    {$ENDIF}
-  end;
 end;
 
 function TPlatformLinux.GetGameUserPath: WideString;
 begin
-  if FindCmdLineSwitch( cUseLocalPaths ) then
-    Result := ExtractFilePath(ParamStr(0))
+  if UseLocalDirs then
+    Result := GetExecutionDir()
   else
-  begin
-    {$IFDEF UseLocalDirs}
-    Result := ExtractFilePath(ParamStr(0));
-    {$ELSE}
     Result := GetHomeDir() + '.ultrastardx/';
-    {$ENDIF}
-  end;
 end;
 
-(**
+{**
  * Returns the user's home directory terminated by a path delimiter
- *)
+ *}
 function TPlatformLinux.GetHomeDir(): string;
 {$IF FPC_VERSION_INT >= 2002002}
 var
diff --git a/src/classes/UPlatformMacOSX.pas b/src/classes/UPlatformMacOSX.pas
index 849c354b..2ab2a390 100644
--- a/src/classes/UPlatformMacOSX.pas
+++ b/src/classes/UPlatformMacOSX.pas
@@ -218,7 +218,7 @@ begin
   // We have to cut the last two folders
   // to get the application folder.
 
-  Result := ExtractFilePath(ParamStr(0));
+  Result := GetExecutionDir();
   for i := 1 to 2 do
   begin
     pos := Length(Result);
diff --git a/src/classes/UPlatformWindows.pas b/src/classes/UPlatformWindows.pas
index ee132a7b..029e8d33 100644
--- a/src/classes/UPlatformWindows.pas
+++ b/src/classes/UPlatformWindows.pas
@@ -214,18 +214,18 @@ end;
 
 function TPlatformWindows.GetLogPath: WideString;
 begin
-  Result := ExtractFilePath(ParamStr(0));
+  Result := GetExecutionDir();
 end;
 
 function TPlatformWindows.GetGameSharedPath: WideString;
 begin
-  Result := ExtractFilePath(ParamStr(0));
+  Result := GetExecutionDir();
 end;
 
 function TPlatformWindows.GetGameUserPath: WideString;
 begin
   //Result := GetSpecialPath(CSIDL_APPDATA) + PathDelim + 'UltraStarDX' + PathDelim;
-  Result := ExtractFilePath(ParamStr(0));
+  Result := GetExecutionDir();
 end;
 
 function TPlatformWindows.CopyFile(const Source, Target: WideString; FailIfExists: boolean): boolean;