Log update installation details to update-log.txt in the correct Mendeley data directory under Linux

src/AppInfo.cpp

@@ -1,7 +1,54 @@
 #include "AppInfo.h"
 
+#include "FileOps.h"
+#include "Platform.h"
+#include "StringUtils.h"
+
+#ifdef PLATFORM_UNIX
+ #include <stdlib.h>
+ #include <pwd.h>
+#endif
+
+#ifdef PLATFORM_UNIX
+std::string homeDir()
+{
+	std::string dir = notNullString(getenv("HOME"));
+	if (!dir.empty())
+	{
+		return dir;
+	}
+	else
+	{
+		// note: if this process has been elevated with sudo,
+		// this will return the home directory of the root user
+		struct passwd* userData = getpwuid(getuid());
+		return notNullString(userData->pw_dir);
+	}
+}
+#endif
+
+std::string appDataPath(const std::string& organizationName,
+                        const std::string& appName)
+{
+#ifdef PLATFORM_LINUX
+	std::string xdgDataHome = notNullString(getenv("XDG_DATA_HOME"));
+	if (xdgDataHome.empty())
+	{
+		xdgDataHome = homeDir() + "/.local/share";
+	}
+	xdgDataHome += "/data/" + organizationName + '/' + appName;
+	return xdgDataHome;
+
+#elif defined(PLATFORM_MAC)
+	// TODO - Mac implementation
+
+#elif defined(PLATFORM_WINDOWS)
+	// TODO - Windows implementation
+#endif
+}
+
 std::string AppInfo::logFilePath()
 {
-	return "update-log.txt";
+	return appDataPath(organizationName(),appName())  + '/' + "update-log.txt";
 }
 

src/AppInfo.h

@@ -12,6 +12,7 @@ class AppInfo
 		// Basic application information
 		static std::string name();
 		static std::string appName();
+		static std::string organizationName();
 
 		static std::string logFilePath();
 };
@@ -26,3 +27,8 @@ inline std::string AppInfo::appName()
 	return "Mendeley Desktop";
 }
 
+inline std::string AppInfo::organizationName()
+{
+	return "Mendeley Ltd.";
+}
+