diff --git a/src/dotfile.cpp b/src/dotfile.cpp
index 67eed1c..8845215 100644
--- a/src/dotfile.cpp
+++ b/src/dotfile.cpp
@@ -19,12 +19,9 @@
 #include "machine.h"
 #include "util/file.h"
 
-std::vector<Dotfile::ExcludePath> Dotfile::s_excludePaths;
-std::vector<std::filesystem::path> Dotfile::s_systemDirectories;
-std::filesystem::path Dotfile::s_workingDirectory;
-size_t Dotfile::s_workingDirectorySize { 0 };
-
-Dotfile::Dotfile()
+Dotfile::Dotfile(s)
+	: m_workingDirectory(std::filesystem::current_path())
+	, m_workingDirectorySize(m_workingDirectory.string().size())
 {
 }
 
@@ -84,18 +81,18 @@ void Dotfile::add(const std::vector<std::string>& targets)
 
 void Dotfile::list(const std::vector<std::string>& targets)
 {
-	if (s_workingDirectory.empty()) {
+	if (m_workingDirectory.empty()) {
 		fprintf(stderr, "\033[31;1mDotfile:\033[0m working directory is unset\n");
 		return;
 	}
 
-	if (!std::filesystem::is_directory(s_workingDirectory)) {
+	if (!std::filesystem::is_directory(m_workingDirectory)) {
 		fprintf(stderr, "\033[31;1mDotfile:\033[0m working directory is not a directory\n");
 		return;
 	}
 
-	forEachDotfile(targets, [](std::filesystem::directory_entry path, size_t) {
-		printf("%s\n", path.path().c_str() + s_workingDirectorySize + 1);
+	forEachDotfile(targets, [this](std::filesystem::directory_entry path, size_t) {
+		printf("%s\n", path.path().c_str() + m_workingDirectorySize + 1);
 	});
 }
 
@@ -131,33 +128,33 @@ void Dotfile::pullOrPush(SyncType type, const std::vector<std::string>& targets)
 	if (type == SyncType::Pull) {
 		sync(
 			type, dotfiles, homeIndices, systemIndices,
-			[](std::string* paths, const std::string& homeFile, const std::string& homeDirectory) {
+			[this](std::string* paths, const std::string& homeFile, const std::string& homeDirectory) {
 				// homeFile = /home/<user>/dotfiles/<file>
 			    // copy: /home/<user>/<file>  ->  /home/<user>/dotfiles/<file>
-				paths[0] = homeDirectory + homeFile.substr(s_workingDirectorySize);
+				paths[0] = homeDirectory + homeFile.substr(m_workingDirectorySize);
 				paths[1] = homeFile;
 			},
-			[](std::string* paths, const std::string& systemFile) {
+			[this](std::string* paths, const std::string& systemFile) {
 				// systemFile = /home/<user>/dotfiles/<file>
 			    // copy: <file>  ->  /home/<user>/dotfiles/<file>
-				paths[0] = systemFile.substr(s_workingDirectorySize);
+				paths[0] = systemFile.substr(m_workingDirectorySize);
 				paths[1] = systemFile;
 			});
 	}
 	else {
 		sync(
 			type, dotfiles, homeIndices, systemIndices,
-			[](std::string* paths, const std::string& homeFile, const std::string& homeDirectory) {
+			[this](std::string* paths, const std::string& homeFile, const std::string& homeDirectory) {
 				// homeFile = /home/<user>/dotfiles/<file>
 			    // copy: /home/<user>/dotfiles/<file>  ->  /home/<user>/<file>
 				paths[0] = homeFile;
-				paths[1] = homeDirectory + homeFile.substr(s_workingDirectorySize);
+				paths[1] = homeDirectory + homeFile.substr(m_workingDirectorySize);
 			},
-			[](std::string* paths, const std::string& systemFile) {
+			[this](std::string* paths, const std::string& systemFile) {
 				// systemFile = /home/<user>/dotfiles/<file>
 			    // copy: /home/<user>/dotfiles/<file>  ->  <file>
 				paths[0] = systemFile;
-				paths[1] = systemFile.substr(s_workingDirectorySize);
+				paths[1] = systemFile.substr(m_workingDirectorySize);
 			});
 	}
 }
@@ -171,7 +168,7 @@ void Dotfile::sync(SyncType type,
 	if (!systemIndices.empty() && !root) {
 		for (size_t i : systemIndices) {
 			fprintf(stderr, "\033[31;1mDotfile:\033[0m need root privileges to copy system file '%s'\n",
-			        paths.at(i).c_str() + s_workingDirectorySize);
+			        paths.at(i).c_str() + m_workingDirectorySize);
 		}
 		return;
 	}
@@ -340,7 +337,7 @@ void Dotfile::selectivelyCommentOrUncomment(const std::string& path)
 void Dotfile::forEachDotfile(const std::vector<std::string>& targets, const std::function<void(const std::filesystem::directory_entry&, size_t)>& callback)
 {
 	size_t index = 0;
-	for (const auto& path : std::filesystem::recursive_directory_iterator { s_workingDirectory }) {
+	for (const auto& path : std::filesystem::recursive_directory_iterator { m_workingDirectory }) {
 		if (path.is_directory() || filter(path)) {
 			continue;
 		}
@@ -353,14 +350,14 @@ void Dotfile::forEachDotfile(const std::vector<std::string>& targets, const std:
 
 bool Dotfile::filter(const std::filesystem::path& path)
 {
-	for (auto& excludePath : s_excludePaths) {
+	for (auto& excludePath : m_excludePaths) {
 		if (excludePath.type == ExcludeType::File) {
-			if (path.string() == s_workingDirectory / excludePath.path) {
+			if (path.string() == m_workingDirectory / excludePath.path) {
 				return true;
 			}
 		}
 		else if (excludePath.type == ExcludeType::Directory) {
-			if (path.string().find(s_workingDirectory / excludePath.path) == 0) {
+			if (path.string().find(m_workingDirectory / excludePath.path) == 0) {
 				return true;
 			}
 		}
@@ -377,7 +374,7 @@ bool Dotfile::filter(const std::filesystem::path& path)
 bool Dotfile::include(const std::filesystem::path& path, const std::vector<std::string>& targets)
 {
 	for (const auto& target : targets) {
-		if (path.string().find(s_workingDirectory / target) == 0) {
+		if (path.string().find(m_workingDirectory / target) == 0) {
 			return true;
 		}
 	}
@@ -387,8 +384,8 @@ bool Dotfile::include(const std::filesystem::path& path, const std::vector<std::
 
 bool Dotfile::isSystemTarget(const std::string& target)
 {
-	for (const auto& systemDirectory : s_systemDirectories) {
-		if (target.find(systemDirectory) - s_workingDirectorySize == 0) {
+	for (const auto& systemDirectory : m_systemDirectories) {
+		if (target.find(systemDirectory) - m_workingDirectorySize == 0) {
 			return true;
 		}
 	}
diff --git a/src/dotfile.h b/src/dotfile.h
index 82f09f5..b4c8b90 100644
--- a/src/dotfile.h
+++ b/src/dotfile.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021 Riyyi
+ * Copyright (C) 2021-2022 Riyyi
  *
  * SPDX-License-Identifier: MIT
  */
@@ -13,9 +13,11 @@
 #include <string>
 #include <vector>
 
-class Dotfile {
+#include "util/singleton.h"
+
+class Dotfile : public Util::Singleton<Dotfile> {
 public:
-	Dotfile();
+	Dotfile(s);
 	virtual ~Dotfile();
 
 	enum class SyncType {
@@ -39,13 +41,13 @@ public:
 	void pull(const std::vector<std::string>& targets = {});
 	void push(const std::vector<std::string>& targets = {});
 
-	static void setWorkingDirectory(std::filesystem::path directory)
+	void setWorkingDirectory(std::filesystem::path directory)
 	{
-		s_workingDirectory = directory;
-		s_workingDirectorySize = directory.string().size();
+		m_workingDirectory = directory;
+		m_workingDirectorySize = directory.string().size();
 	}
-	static void setSystemDirectories(const std::vector<std::filesystem::path>& systemDirectories) { s_systemDirectories = systemDirectories; }
-	static void setExcludePaths(const std::vector<ExcludePath>& excludePaths) { s_excludePaths = excludePaths; }
+	void setSystemDirectories(const std::vector<std::filesystem::path>& systemDirectories) { m_systemDirectories = systemDirectories; }
+	void setExcludePaths(const std::vector<ExcludePath>& excludePaths) { m_excludePaths = excludePaths; }
 
 private:
 	void pullOrPush(SyncType type, const std::vector<std::string>& targets = {});
@@ -60,10 +62,10 @@ private:
 	bool include(const std::filesystem::path& path, const std::vector<std::string>& targets);
 	bool isSystemTarget(const std::string& target);
 
-	static std::vector<ExcludePath> s_excludePaths;
-	static std::vector<std::filesystem::path> s_systemDirectories;
-	static std::filesystem::path s_workingDirectory;
-	static size_t s_workingDirectorySize;
+	std::vector<ExcludePath> m_excludePaths;
+	std::vector<std::filesystem::path> m_systemDirectories;
+	std::filesystem::path m_workingDirectory;
+	size_t m_workingDirectorySize { 0 };
 };
 
 #endif // DOTFILE_H
diff --git a/src/main.cpp b/src/main.cpp
index e807e5d..2c78e15 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -63,9 +63,7 @@ int main(int argc, const char* argv[])
 	Util::Timer t;
 
 	if (fileOperation) {
-		Dotfile dotfile;
-
-		Dotfile::setExcludePaths({
+		Dotfile::the().setExcludePaths({
 			{ Dotfile::ExcludeType::File, "dotfiles.sh" },
 			{ Dotfile::ExcludeType::File, "packages" },
 			{ Dotfile::ExcludeType::EndsWith, ".md" },
@@ -78,20 +76,19 @@ int main(int argc, const char* argv[])
 			{ Dotfile::ExcludeType::Directory, "cppcheck-cppcheck-build-dir" },
 		});
 
-		Dotfile::setSystemDirectories({ "/boot", "/etc", "/usr/share" });
-		Dotfile::setWorkingDirectory(std::filesystem::current_path());
+		Dotfile::the().setSystemDirectories({ "/boot", "/etc", "/usr/share" });
 
 		if (addOrAur) {
-			dotfile.add(targets);
+			Dotfile::the().add(targets);
 		}
 		if (pull) {
-			dotfile.pull(targets);
+			Dotfile::the().pull(targets);
 		}
 		if (pushOrStore) {
-			dotfile.push(targets);
+			Dotfile::the().push(targets);
 		}
 		if (!addOrAur && !pull && !pushOrStore) {
-			dotfile.list(targets);
+			Dotfile::the().list(targets);
 		}
 	}
 	else if (packageOperation) {