1 files changed, 149 insertions, 0 deletions
diff --git a/src/base/UPlatformLinux.pas b/src/base/UPlatformLinux.pas
new file mode 100644
index 00000000..693facaa
--- /dev/null
+++ b/src/base/UPlatformLinux.pas
@@ -0,0 +1,149 @@
+{* UltraStar Deluxe - Karaoke Game
+ *
+ * UltraStar Deluxe is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *}
+
+unit UPlatformLinux;
+
+interface
+
+{$IFDEF FPC}
+  {$MODE Delphi}
+{$ENDIF}
+
+{$I switches.inc}
+
+uses
+  Classes,
+  UPlatform,
+  UConfig,
+  UPath;
+
+type
+  TPlatformLinux = class(TPlatform)
+    private
+      UseLocalDirs: boolean;
+
+      procedure DetectLocalExecution();
+      function GetHomeDir(): IPath;
+    public
+      procedure Init; override;
+      
+      function GetLogPath        : IPath; override;
+      function GetGameSharedPath : IPath; override;
+      function GetGameUserPath   : IPath; override;
+  end;
+
+implementation
+
+uses
+  UCommandLine,
+  BaseUnix,
+  pwd,
+  SysUtils,
+  ULog;
+
+const
+  {$I paths.inc}
+
+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 paths.inc.
+ *
+ * Sets UseLocalDirs to true if the game is executed locally, false otherwise.
+ *}
+procedure TPlatformLinux.DetectLocalExecution();
+var
+  LocalDir, LanguageDir: IPath;
+begin
+  // we just check if the 'languages' folder exists in the
+  // directory of the executable. If so -> local execution.
+  LocalDir := GetExecutionDir();
+  LanguageDir := LocalDir.Append('languages');
+  UseLocalDirs := LanguageDir.IsDirectory;
+end;
+
+function TPlatformLinux.GetLogPath: IPath;
+begin
+  if UseLocalDirs then
+    Result := GetExecutionDir()
+  else
+    Result := GetGameUserPath().Append('logs', pdAppend);
+
+  // create non-existing directories
+  Result.CreateDirectory(true);
+end;
+
+function TPlatformLinux.GetGameSharedPath: IPath;
+begin
+  if UseLocalDirs then
+    Result := GetExecutionDir()
+  else
+    Result := Path(INSTALL_DATADIR, pdAppend);
+end;
+
+function TPlatformLinux.GetGameUserPath: IPath;
+begin
+  if UseLocalDirs then
+    Result := GetExecutionDir()
+  else
+    Result := GetHomeDir().Append('.ultrastardx', pdAppend);
+end;
+
+{**
+ * Returns the user's home directory terminated by a path delimiter
+ *}
+function TPlatformLinux.GetHomeDir(): IPath;
+var
+  PasswdEntry: PPasswd;
+begin
+  Result := PATH_NONE;
+
+  // try to retrieve the info from passwd
+  PasswdEntry := FpGetpwuid(FpGetuid());
+  if (PasswdEntry <> nil) then
+    Result := Path(PasswdEntry.pw_dir);
+  // fallback if passwd does not contain the path
+  if (Result.IsUnset) then
+    Result := Path(GetEnvironmentVariable('HOME'));
+  // add trailing path delimiter (normally '/')
+  if (Result.IsSet) then
+    Result := Result.AppendPathDelim();
+
+  // GetUserDir() is another function that returns a user path.
+  // It uses env-var HOME or a fallback to a temp-dir.
+  //Result := GetUserDir();
+end;
+
+end.