18 files changed, 568 insertions, 78 deletions

diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index 84f331e..a8fa7af 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -41,6 +41,8 @@ add_source_group(MODEL_MODULE_SOURCES
 )
 
 add_source_group(MODEL_TEMPLATE_SOURCES
+	src/Model/Template/Template_Main.cpp
+	src/Model/Template/Template_RTTI.cpp
 	src/Model/Template/TableTemplate.cpp
 )
 
@@ -67,11 +69,12 @@ set(UI_MODULE_SOURCES
 	src/UI/Localization.cpp
 	src/UI/States.cpp
 	src/UI/UI_DatabaseView.cpp
-	src/UI/UI_Workflows.cpp
 	src/UI/UI_Items.cpp
 	src/UI/UI_MainWindow.cpp
 	src/UI/UI_Settings.cpp
+	src/UI/UI_Templates.cpp
 	src/UI/UI_Utils.cpp
+	src/UI/UI_Workflows.cpp
 )
 
 add_source_group(UTILS_MODULE_SOURCES
diff --git a/core/locale/zh_CN.json b/core/locale/zh_CN.json
index e5df7ee..8e495d7 100644
--- a/core/locale/zh_CN.json
+++ b/core/locale/zh_CN.json
@@ -13,7 +13,8 @@
 	"MainWindow.Tab.Project": "\uf15b 项目",
 	"MainWindow.Tab.DatabaseView": "\uf1c0 数据",
 	"MainWindow.Tab.Items": "\uf466 物品",
-	"MainWindow.Tab.Workflows": "\uf5cb 工作流",
+	"MainWindow.Tab.Workflows": "\uf70e 工作流",
+	"MainWindow.Tab.Templates": "\uf0ce 模板",
 	"Project.New": "新建项目...",
 	"Project.New.DialogTitle": "新建项目向导",
 	"Project.New.Name": "项目名称",
@@ -28,8 +29,7 @@
 	"Project.Recents.NonePresent": "（暂无最近使用的项目）",
 	"Project.Recents.Open.Tooltip": "打开该项目",
 	"Project.Recents.Delete.Tooltip": "将该项目从最近使用列表中删除，项目本身将不受影响。",
-	"Project.InvalidProjectFormat": "无效的项目文件",
-	"ActiveProject.Close": "\uf00d 关闭项目",
+        "Project.InvalidProjectFormat": "无效的项目文件",
 	"ActiveProject.OpenInFilesystem": "\uf07b 在文件系统中打开",
 	"ActiveProject.Info.Name": "项目名称：",
 	"ActiveProject.Info.Path": "项目路径：",
@@ -65,4 +65,4 @@
 	"Workflow.Open.DialogTitle": "打开工作流",
 	"Workflow.Manage": "管理工作流...",
 	"Workflow.Manage.DialogTitle": "管理工作流",
-}
\ No newline at end of file
+}
diff --git a/core/src/Entrypoint/main.cpp b/core/src/Entrypoint/main.cpp
index 2d0238e..152a1c8 100644
--- a/core/src/Entrypoint/main.cpp
+++ b/core/src/Entrypoint/main.cpp
@@ -156,11 +156,7 @@ int main(int argc, char* argv[])
 		GlobalStates::Init();
 	} else {
 		fs::path path(dataDirOption);
-		if (fs::exists(path)) {
-			GlobalStates::Init(std::move(path));
-		} else {
-			GlobalStates::Init();
-		}
+		GlobalStates::Init(std::move(path));
 	}
 	DEFER
 	{
diff --git a/core/src/Model/Project.cpp b/core/src/Model/Project.cpp
index 2d7c82a..3cb3cb4 100644
--- a/core/src/Model/Project.cpp
+++ b/core/src/Model/Project.cpp
@@ -25,19 +25,19 @@ void ReadItemList(ItemList<T>& list, const fs::path& filePath)
 	}
 }
 
-Project::Project(const fs::path& rootPath)
-	: mRootPath{ rootPath }
+Project::Project(fs::path rootPath)
+	: mRootPath{ std::move(rootPath) }
 	, mRootPathString{ mRootPath.string() }
 	, Database(*this)
 {
 	// TODO better diagnostic
 	const char* kInvalidFormatErr = "Failed to load project: invalid format.";
 
-	std::ifstream ifs(rootPath / "cplt_project.json");
+	std::ifstream ifs(mRootPath / "cplt_project.json");
 	if (!ifs) {
 		std::string message;
 		message += "Failed to load project file at '";
-		message += rootPath.string();
+		message += mRootPath.string();
 		message += "'.";
 		throw std::runtime_error(message);
 	}
@@ -81,7 +81,7 @@ Project::Project(const fs::path& rootPath)
 	}
 }
 
-Project::Project(std::filesystem::path rootPath, std::string name)
+Project::Project(fs::path rootPath, std::string name)
 	: mRootPath{ std::move(rootPath) }
 	, mRootPathString{ mRootPath.string() }
 	, mName{ std::move(name) }
@@ -99,6 +99,36 @@ const std::string& Project::GetPathString() const
 	return mRootPathString;
 }
 
+fs::path Project::GetDatabasesDirectory() const
+{
+	return mRootPath / "databases";
+}
+
+fs::path Project::GetItemsDirectory() const
+{
+	return mRootPath / "items";
+}
+
+fs::path Project::GetWorkflowsDirectory() const
+{
+	return mRootPath / "workflows";
+}
+
+fs::path Project::GetWorkflowPath(std::string_view name) const
+{
+	return (mRootPath / "workflows" / name).concat(".cplt-workflow");
+}
+
+fs::path Project::GetTemplatesDirectory() const
+{
+	return mRootPath / "templates";
+}
+
+fs::path Project::GetTemplatePath(std::string_view name) const
+{
+	return (mRootPath / "templates" / name).concat(".cplt-template");
+}
+
 const std::string& Project::GetName() const
 {
 	return mName;
@@ -109,7 +139,7 @@ void Project::SetName(std::string name)
 	mName = std::move(name);
 }
 
-const decltype(Project::mWorkflows)& Project::GetWorkflows() const
+const tsl::array_map<char, WorkflowInfo>& Project::GetWorkflows() const
 {
 	return mWorkflows;
 }
@@ -132,11 +162,12 @@ std::unique_ptr<Workflow> Project::CreateWorkflow(std::string_view name)
 	}
 
 	auto workflow = std::make_unique<Workflow>();
-	auto [it, DISCARD] = mWorkflows.insert(name, WorkflowInfo{});
-	auto& info = it.value();
-
-	info.Name = name;
-	info.Path = GetWorkflowPath(name);
+	auto [it, DISCARD] = mWorkflows.insert(
+		name,
+		WorkflowInfo{
+			.Path = GetWorkflowPath(name),
+			.Name = std::string(name),
+		});
 
 	return workflow;
 }
@@ -155,9 +186,9 @@ bool Project::RemoveWorkflow(std::string_view name)
 	return true;
 }
 
-bool Project::RenameWorkflow(std::string_view name, std::string_view newName)
+bool Project::RenameWorkflow(std::string_view oldName, std::string_view newName)
 {
-	auto iter = mWorkflows.find(name);
+	auto iter = mWorkflows.find(oldName);
 	if (iter == mWorkflows.end()) return false;
 
 	auto info = std::move(iter.value());
@@ -173,6 +204,63 @@ bool Project::RenameWorkflow(std::string_view name, std::string_view newName)
 	return true;
 }
 
+const tsl::array_map<char, TemplateInfo>& Project::GetTemplates() const
+{
+	return mTemplates;
+}
+
+std::unique_ptr<Template> Project::LoadTemplate(std::string_view name)
+{
+	auto iter = mTemplates.find(name);
+	if (iter == mTemplates.end()) {
+		return iter.value().LoadFromDisk();
+	} else {
+		return nullptr;
+	}
+}
+
+TemplateInfo* Project::InsertTemplate(std::string_view name, TemplateInfo info)
+{
+	auto [it, inserted] = mTemplates.insert(name, info);
+	if (inserted) {
+		return &it.value();
+	} else {
+		return nullptr;
+	}
+}
+
+bool Project::RemoveTemplate(std::string_view name)
+{
+	auto iter = mTemplates.find(name);
+	if (iter == mTemplates.end()) {
+		return false;
+	}
+	auto& info = iter.value();
+
+	fs::remove(info.Path);
+	mTemplates.erase(iter);
+
+	return true;
+}
+
+bool Project::RenameTemplate(std::string_view oldName, std::string_view newName)
+{
+	auto iter = mTemplates.find(oldName);
+	if (iter == mTemplates.end()) return false;
+
+	auto info = std::move(iter.value());
+
+	auto& oldPath = info.Path;
+	auto newPath = GetTemplatePath(newName);
+	fs::rename(oldPath, newPath);
+	info.Path = std::move(newPath);
+
+	mTemplates.insert(newName, std::move(info));
+	mTemplates.erase(iter);
+
+	return true;
+}
+
 Json::Value Project::Serialize()
 {
 	Json::Value root(Json::objectValue);
@@ -201,23 +289,3 @@ void Project::WriteToDisk()
 	WriteItemList(Factories, itemsDir / "factories.json");
 	WriteItemList(Customers, itemsDir / "customers.json");
 }
-
-std::filesystem::path Project::GetDatabasesDirectory() const
-{
-	return mRootPath / "databases";
-}
-
-std::filesystem::path Project::GetItemsDirectory() const
-{
-	return mRootPath / "items";
-}
-
-std::filesystem::path Project::GetWorkflowsDirectory() const
-{
-	return mRootPath / "workflows";
-}
-
-std::filesystem::path Project::GetWorkflowPath(std::string_view name) const
-{
-	return (mRootPath / "workflows" / name).concat(".cplt-workflow");
-}
diff --git a/core/src/Model/Project.hpp b/core/src/Model/Project.hpp
index 5f26532..bce58c2 100644
--- a/core/src/Model/Project.hpp
+++ b/core/src/Model/Project.hpp
@@ -1,7 +1,9 @@
 #pragma once
 
 #include "Model/Items.hpp"
+#include "Model/Template/Template.hpp"
 #include "Model/TransactionsModel.hpp"
+#include "Model/Workflow/Workflow.hpp"
 
 #include <json/forwards.h>
 #include <tsl/array_map.h>
@@ -15,17 +17,21 @@ public:
 	ItemList<ProductItem> Products;
 	ItemList<FactoryItem> Factories;
 	ItemList<CustomerItem> Customers;
-	TransactionModel Database;
 
 private:
 	tsl::array_map<char, WorkflowInfo> mWorkflows;
+	tsl::array_map<char, TemplateInfo> mTemplates;
 	std::filesystem::path mRootPath;
 	std::string mRootPathString;
 	std::string mName;
 
+	// This is put after the private fields, so that when TransactionModel's constructor runs, all of them will be initialized
+public:
+	TransactionModel Database;
+
 public:
 	/// Load the project from a directory containing the cplt_project.json file.
-	Project(const std::filesystem::path& rootPath);
+	Project(std::filesystem::path rootPath);
 
 	/// Create a project with the given name in the given path. Note that the path should be a directory that will contain the project files once created.
 	/// This function assumes the given directory will exist and is empty.
@@ -39,15 +45,23 @@ public:
 	std::filesystem::path GetItemsDirectory() const;
 	std::filesystem::path GetWorkflowsDirectory() const;
 	std::filesystem::path GetWorkflowPath(std::string_view name) const;
+	std::filesystem::path GetTemplatesDirectory() const;
+	std::filesystem::path GetTemplatePath(std::string_view name) const;
 
 	const std::string& GetName() const;
 	void SetName(std::string name);
 
-	const decltype(mWorkflows)& GetWorkflows() const;
+	const tsl::array_map<char, WorkflowInfo>& GetWorkflows() const;
 	std::unique_ptr<Workflow> LoadWorkflow(std::string_view name);
 	std::unique_ptr<Workflow> CreateWorkflow(std::string_view name);
 	bool RemoveWorkflow(std::string_view name);
-	bool RenameWorkflow(std::string_view name, std::string_view newName);
+	bool RenameWorkflow(std::string_view oldName, std::string_view newName);
+
+	const tsl::array_map<char, TemplateInfo>& GetTemplates() const;
+	std::unique_ptr<Template> LoadTemplate(std::string_view name);
+	bool InsertTemplate(std::string_view name, TemplateInfo info);
+	bool RemoveTemplate(std::string_view name);
+	bool RenameTemplate(std::string_view oldName, std::string_view newName);
 
 	Json::Value Serialize();
 	void WriteToDisk();
diff --git a/core/src/Model/Template/TableTemplate.cpp b/core/src/Model/Template/TableTemplate.cpp
index 258bb37..0ad1cca 100644
--- a/core/src/Model/Template/TableTemplate.cpp
+++ b/core/src/Model/Template/TableTemplate.cpp
@@ -5,6 +5,7 @@
 
 bool TableCell::IsDataHoldingCell() const
 {
+	return IsPrimaryCell() || !IsMergedCell();
 }
 
 bool TableCell::IsPrimaryCell() const
@@ -58,12 +59,12 @@ const TableTemplate& TableInstanciationParameters::GetTable() const
 
 int TableTemplate::GetTableWidth() const
 {
-	return mTableWidth;
+	return mColumnWidths.size();
 }
 
 int TableTemplate::GetTableHeight() const
 {
-	return mTableHeight;
+	return mRowHeights.size();
 }
 
 void TableTemplate::Resize(int newWidth, int newHeight)
@@ -73,10 +74,13 @@ void TableTemplate::Resize(int newWidth, int newHeight)
 	std::vector<TableCell> cells;
 	cells.reserve(newWidth * newHeight);
 
-	int yEnd = std::min(mTableHeight, newHeight);
-	int xEnd = std::min(mTableWidth, newWidth);
+	int tableWidth = GetTableWidth();
+	int tableHeight = GetTableHeight();
+
+	int yEnd = std::min(tableHeight, newHeight);
+	int xEnd = std::min(tableWidth, newWidth);
 	for (int y = 0; y < yEnd; ++y) {
-		if (y >= mTableHeight) {
+		if (y >= tableHeight) {
 			for (int x = 0; x < xEnd; ++x) {
 				cells.push_back(TableCell{});
 			}
@@ -84,7 +88,7 @@ void TableTemplate::Resize(int newWidth, int newHeight)
 		}
 
 		for (int x = 0; x < xEnd; ++x) {
-			if (x >= mTableWidth) {
+			if (x >= tableWidth) {
 				cells.push_back(TableCell{});
 			} else {
 				auto& cell = GetCell({ x, y });
@@ -96,9 +100,30 @@ void TableTemplate::Resize(int newWidth, int newHeight)
 	mCells = std::move(cells);
 }
 
+int TableTemplate::GetRowHeight(int row) const
+{
+	return mRowHeights[row];
+}
+
+void TableTemplate::SetRowHeight(int row, int height)
+{
+	mRowHeights[row] = height;
+}
+
+int TableTemplate::GetColumnWidth(int column) const
+{
+	return mColumnWidths[column];
+}
+
+void TableTemplate::SetColumnWidth(int column, int width)
+{
+	mColumnWidths[column] = width;
+}
+
 const TableCell& TableTemplate::GetCell(Vec2i pos) const
 {
-	return mCells[pos.y * mTableWidth + pos.x];
+	int tableWidth = GetTableWidth();
+	return mCells[pos.y * tableWidth + pos.x];
 }
 
 TableCell& TableTemplate::GetCell(Vec2i pos)
@@ -194,7 +219,7 @@ lxw_worksheet* TableTemplate::InstanciateToExcelWorksheet(lxw_workbook* workbook
 		// Not enough space to fit in this array group, update (or insert) the appropriate amount of generated rows
 		int row = i;
 		int count = param.size();
-		generatedRanges.insert(row, count);
+		generatedRanges.try_emplace(row, count);
 	}
 
 	auto GetOffset = [&](int y) -> int {
@@ -217,27 +242,33 @@ lxw_worksheet* TableTemplate::InstanciateToExcelWorksheet(lxw_workbook* workbook
 		}
 	};
 
-	// Write/instanciate all array groups
+	// Write/instantiate all array groups
 	for (size_t i = 0; i < mArrayGroups.size(); ++i) {
 		auto& groupInfo = mArrayGroups[i];
 		auto& groupParams = params.ArrayGroups[i];
 
 		int rowCellCount = groupInfo.GetCount();
-		int row = groupInfo.Row + GetOffset(groupInfo.Row);
+		int rowCount = groupParams.size();
+		int baseRowIdx = groupInfo.Row + GetOffset(groupInfo.Row);
 
 		// For each row that would be generated
-		for (auto& rowCells : groupParams) {
+		for (int rowIdx = 0; rowIdx < rowCount; ++rowIdx) {
+			auto& row = groupParams[rowIdx];
+
 			// For each cell in the row
-			for (int i = 0; i < rowCellCount; ++i) {
-				// TODO spport merged cells in array groups
-				worksheet_write_string(worksheet, row + i, col, rowCells[i].c_str(), nullptr);
+			for (int rowCellIdx = 0; rowCellIdx < rowCellCount; ++rowCellIdx) {
+				// TODO support merged cells in array groups
+				worksheet_write_string(worksheet, baseRowIdx + rowIdx, rowCellIdx, row[rowCellIdx].c_str(), nullptr);
 			}
 		}
 	}
 
+	int tableWidth = GetTableWidth();
+	int tableHeight = GetTableHeight();
+
 	// Write all regular and singular parameter cells
-	for (int y = 0; y < mTableHeight; ++y) {
-		for (int x = 0; x < mTableWidth; ++x) {
+	for (int y = 0; y < tableHeight; ++y) {
+		for (int x = 0; x < tableWidth; ++x) {
 			auto& cell = GetCell({ x, y });
 
 			if (!cell.IsDataHoldingCell()) {
diff --git a/core/src/Model/Template/TableTemplate.hpp b/core/src/Model/Template/TableTemplate.hpp
index be043a9..688192a 100644
--- a/core/src/Model/Template/TableTemplate.hpp
+++ b/core/src/Model/Template/TableTemplate.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "Model/Template/Template.hpp"
 #include "Utils/Vector.hpp"
 #include "Utils/VectorHash.hpp"
 #include "cplt_fwd.hpp"
@@ -127,19 +128,24 @@ public:
 /// parametric rows/columns, and grids are also supported.
 ///
 /// This current supports exporting to xlsx files.
-class TableTemplate
+class TableTemplate : public Template
 {
 private:
 	std::vector<TableCell> mCells;
 	std::vector<TableCellArrayGroup> mArrayGroups;
-	int mTableWidth;
-	int mTableHeight;
+	std::vector<int> mRowHeights;
+	std::vector<int> mColumnWidths;
 
 public:
 	int GetTableWidth() const;
 	int GetTableHeight() const;
 	void Resize(int newWidth, int newHeight);
 
+	int GetRowHeight(int row) const;
+	void SetRowHeight(int row, int height);
+	int GetColumnWidth(int column) const;
+	void SetColumnWidth(int column, int width);
+
 	const TableCell& GetCell(Vec2i pos) const;
 	TableCell& GetCell(Vec2i pos);
 
diff --git a/core/src/Model/Template/Template.hpp b/core/src/Model/Template/Template.hpp
new file mode 100644
index 0000000..0901a1b
--- /dev/null
+++ b/core/src/Model/Template/Template.hpp
@@ -0,0 +1,45 @@
+#pragma once
+
+#include "cplt_fwd.hpp"
+
+#include <filesystem>
+#include <iosfwd>
+#include <memory>
+#include <string>
+
+class Template
+{
+public:
+	enum Kind
+	{
+		KD_Table,
+
+		InvalidKind,
+		KindCount = InvalidKind,
+	};
+
+public:
+	static const char* FormatKind(Kind kind);
+	static std::unique_ptr<Template> CreateByKind(Kind kind);
+
+	virtual ~Template() = default;
+
+	enum class ReadResult
+	{
+		RR_Success,
+		RR_InvalidFormat,
+	};
+	ReadResult ReadFrom(std::istream& stream) = 0;
+	void WriteTo(std::ostream& stream) const = 0;
+};
+
+class TemplateInfo
+{
+public:
+	std::filesystem::path Path;
+	std::string Name;
+	std::string PathStringCache = Path.string();
+	Template::Kind Kind;
+
+	std::unique_ptr<Template> LoadFromDisk() const;
+};
diff --git a/core/src/Model/Template/Template_Main.cpp b/core/src/Model/Template/Template_Main.cpp
new file mode 100644
index 0000000..eeb6871
--- /dev/null
+++ b/core/src/Model/Template/Template_Main.cpp
@@ -0,0 +1,5 @@
+#include "Template.hpp"
+
+std::unique_ptr<Template> TemplateInfo::LoadFromDisk() const
+{
+}
diff --git a/core/src/Model/Template/Template_RTTI.cpp b/core/src/Model/Template/Template_RTTI.cpp
new file mode 100644
index 0000000..042aaec
--- /dev/null
+++ b/core/src/Model/Template/Template_RTTI.cpp
@@ -0,0 +1,21 @@
+#include "Template.hpp"
+
+#include "Model/Template/TableTemplate.hpp"
+
+inline const char* Template::FormatKind(Kind kind)
+{
+	switch (kind) {
+		case KD_Table: return "Table template";
+
+		case InvalidKind: return "<invalid kind>";
+	}
+}
+
+inline std::unique_ptr<Template> Template::CreateByKind(Kind kind)
+{
+	switch (kind) {
+		case KD_Table: return std::make_unique<TableTemplate>();
+
+		case InvalidKind: return nullptr;
+	}
+}
diff --git a/core/src/Model/Template/fwd.hpp b/core/src/Model/Template/fwd.hpp
index 2f41f22..6bc7349 100644
--- a/core/src/Model/Template/fwd.hpp
+++ b/core/src/Model/Template/fwd.hpp
@@ -5,3 +5,7 @@ class TableCell;
 class TableCellArrayGroup;
 class TableInstanciationParameters;
 class TableTemplate;
+
+// Template.hpp
+class Template;
+class TemplateInfo;
diff --git a/core/src/Model/Workflow/Workflow.hpp b/core/src/Model/Workflow/Workflow.hpp
index 99e4e90..ded9bfb 100644
--- a/core/src/Model/Workflow/Workflow.hpp
+++ b/core/src/Model/Workflow/Workflow.hpp
@@ -173,9 +173,9 @@ protected:
 
 struct WorkflowInfo
 {
+	std::filesystem::path Path;
 	std::string Name;
 	std::string PathStringCache = Path.string();
-	std::filesystem::path Path;
 
 	std::unique_ptr<Workflow> LoadFromDisk() const;
 };
diff --git a/core/src/Model/fwd.hpp b/core/src/Model/fwd.hpp
index 6fa29c5..09b0c75 100644
--- a/core/src/Model/fwd.hpp
+++ b/core/src/Model/fwd.hpp
@@ -3,6 +3,8 @@
 #include "Model/Template/fwd.hpp"
 #include "Model/Workflow/fwd.hpp"
 
+// Assets.hpp
+
 // Filter.hpp
 class TableRowsFilter;
 
diff --git a/core/src/UI/Localization.hpp b/core/src/UI/Localization.hpp
index c470fa7..43ee23b 100644
--- a/core/src/UI/Localization.hpp
+++ b/core/src/UI/Localization.hpp
@@ -32,6 +32,7 @@ public:
 	BasicTranslation DatabaseViewTab{ "MainWindow.Tab.DatabaseView"sv };
 	BasicTranslation ItemsTab{ "MainWindow.Tab.Items"sv };
 	BasicTranslation WorkflowsTab{ "MainWindow.Tab.Workflows"sv };
+	BasicTranslation TemplatesTab{ "MainWindow.Tab.Templates"sv };
 
 	/* Project tab */
 
@@ -54,7 +55,6 @@ public:
 
 	BasicTranslation InvalidProjectFormat{ "Project.InvalidProjectFormat"sv };
 
-	BasicTranslation CloseActiveProject{ "ActiveProject.Close"sv };
 	BasicTranslation OpenActiveProjectInFileSystem{ "ActiveProject.OpenInFilesystem"sv };
 	BasicTranslation ActiveProjectName{ "ActiveProject.Info.Name"sv };
 	BasicTranslation ActiveProjectPath{ "ActiveProject.Info.Path"sv };
diff --git a/core/src/UI/UI.hpp b/core/src/UI/UI.hpp
index cce0e00..dfce713 100644
--- a/core/src/UI/UI.hpp
+++ b/core/src/UI/UI.hpp
@@ -41,5 +41,6 @@ void SettingsTab();
 void DatabaseViewTab();
 void ItemsTab();
 void WorkflowsTab();
+void TemplatesTab();
 
 } // namespace UI
diff --git a/core/src/UI/UI_MainWindow.cpp b/core/src/UI/UI_MainWindow.cpp
index b1bee7d..1838aec 100644
--- a/core/src/UI/UI_MainWindow.cpp
+++ b/core/src/UI/UI_MainWindow.cpp
@@ -21,7 +21,7 @@ void ProjectTab_Normal()
 	auto& gs = GlobalStates::GetInstance();
 	auto& uis = UIState::GetInstance();
 
-	if (ImGui::Button(ls->CloseActiveProject.Get())) {
+	if (ImGui::Button(ls->Close.Get())) {
 		uis.CloseCurrentProject();
 		return;
 	}
@@ -93,9 +93,9 @@ void ProjectTab_NoProject()
 			uis.SetCurrentProject(std::make_unique<Project>(std::move(dirPath), std::move(projectName)));
 
 			// Dialog just got closed, reset states
-			projectName = "";
-			dirName = "";
-			dirPath = fs::path{};
+			projectName.clear();
+			dirName.clear();
+			dirPath.clear();
 			dirNameIsValid = false;
 		}
 
@@ -231,6 +231,11 @@ void UI::MainWindow()
 			ImGui::EndTabItem();
 		}
 
+		if (ImGui::BeginTabItem(ls->TemplatesTab.Get())) {
+			UI::TemplatesTab();
+			ImGui::EndTabItem();
+		}
+
 	endTab:
 		ImGui::EndTabBar();
 	}
diff --git a/core/src/UI/UI_Templates.cpp b/core/src/UI/UI_Templates.cpp
new file mode 100644
index 0000000..628f3f7
--- /dev/null
+++ b/core/src/UI/UI_Templates.cpp
@@ -0,0 +1,289 @@
+#include "UI.hpp"
+
+#include "Model/Project.hpp"
+#include "Model/Template/TableTemplate.hpp"
+#include "Model/Template/Template.hpp"
+#include "UI/Localization.hpp"
+#include "UI/States.hpp"
+
+#include <imgui.h>
+#include <imgui_extra_math.h>
+#include <imgui_stdlib.h>
+#include <fstream>
+#include <iostream>
+#include <utility>
+
+namespace {
+class TemplateUI
+{
+public:
+	virtual ~TemplateUI() = default;
+	virtual void Draw() = 0;
+};
+
+class TableTemplateUI : public TemplateUI
+{
+private:
+	std::unique_ptr<TableTemplate> mTable;
+
+public:
+	TableTemplateUI(std::unique_ptr<TableTemplate> table)
+		: mTable{ std::move(table) }
+	{
+	}
+
+	virtual void Draw() override
+	{
+		ImGui::Columns(2);
+
+		DrawInspector();
+		ImGui::NextColumn();
+
+		DrawTable();
+		ImGui::NextColumn();
+
+		ImGui::Columns(1);
+	}
+
+private:
+	void DrawInspector()
+	{
+	}
+
+	void DrawTable()
+	{
+		constexpr int kCellSpacing = 20;
+
+		int colCount = mTable->GetTableWidth();
+		int rowCount = mTable->GetTableHeight();
+		float x = 0.0f;
+		float y = 0.0f;
+		for (int rowIdx = 0; rowIdx < rowCount; ++rowIdx) {
+			int rowHeight = mTable->GetRowHeight(rowIdx);
+
+			for (int colIdx = 0; colIdx < colCount; ++colIdx) {
+				int colWidth = mTable->GetColumnWidth(colIdx);
+
+				ImRect rect{
+					ImVec2(x, y),
+					ImVec2(colWidth, rowHeight),
+				};
+
+				// TODO
+
+				x += colWidth;
+				x += kCellSpacing;
+			}
+
+			y += rowHeight;
+			y += kCellSpacing;
+		}
+	}
+};
+
+struct DrawTemplateList_State
+{
+	// Internal data
+
+	// Items that are intended for user usage
+	const TemplateInfo* SelectedTemplate = nullptr;
+};
+
+void DrawTemplateList(DrawTemplateList_State& state)
+{
+	auto& uis = UIState::GetInstance();
+	auto& templates = uis.CurrentProject->GetTemplates();
+
+	for (auto& info : templates) {
+		if (ImGui::Selectable(info.Name.c_str(), state.SelectedTemplate == &info)) {
+			state.SelectedTemplate = &info;
+		}
+		if (ImGui::IsItemHovered()) {
+			ImGui::BeginTooltip();
+			ImGui::Text("Path: %s", info.PathStringCache.c_str());
+			ImGui::EndTooltip();
+		}
+	}
+}
+} // namespace
+
+void UI::TemplatesTab()
+{
+	auto ls = LocaleStrings::Instance.get();
+	auto& uis = UIState::GetInstance();
+
+	bool openedDummy = true;
+	static std::unique_ptr<TemplateUI> openTemplate;
+	static DrawTemplateList_State state;
+
+	// Toolbar item: close
+	if (ImGui::Button(ls->Close.Get(), openTemplate == nullptr)) {
+		openTemplate = nullptr;
+	}
+
+	// Toolbar item: open...
+	ImGui::SameLine();
+	if (ImGui::Button("Open...")) {
+		ImGui::OpenPopup("Open template");
+	}
+	if (ImGui::BeginPopupModal("Open template", &openedDummy, ImGuiWindowFlags_AlwaysAutoResize)) {
+		DrawTemplateList(state);
+
+		if (state.SelectedTemplate) {
+			// TODO
+		}
+
+		ImGui::EndPopup();
+	}
+
+	// Toolbar item: manage...
+	ImGui::SameLine();
+	if (ImGui::Button("Manage...")) {
+		ImGui::OpenPopup("Manage templates");
+	}
+	if (ImGui::BeginPopupModal("Manage templates", &openedDummy, ImGuiWindowFlags_AlwaysAutoResize)) {
+		DrawTemplateList(state);
+
+		enum class NameSelectionError
+		{
+			None,
+			Duplicated,
+			Empty,
+		};
+
+		static std::string newName;
+		static NameSelectionError newNameError;
+		auto ValidateNewName = [&]() -> void {
+			if (newName.empty()) {
+				newNameError = NameSelectionError::Empty;
+			}
+
+			auto& templates = uis.CurrentProject->GetTemplates();
+			if (templates.find(newName) != templates.end()) {
+				newNameError = NameSelectionError::Duplicated;
+			}
+		};
+		auto ShowNewNameErrors = [&]() -> void {
+			switch (newNameError) {
+				case NameSelectionError::None: break;
+				case NameSelectionError::Duplicated:
+					ImGui::ErrorMessage("Duplicate template name");
+					break;
+				case NameSelectionError::Empty:
+					ImGui::ErrorMessage("Template name cannot be empty");
+					break;
+			}
+		};
+
+		static Template::Kind newKind = Template::InvalidKind;
+		auto ShowNewKindErrors = [&]() -> void {
+			if (newKind == Template::InvalidKind) {
+				ImGui::ErrorMessage("Must select a valid template type");
+			}
+		};
+
+		auto IsInputValid = [&]() -> bool {
+			return newNameError == NameSelectionError::None && newKind != Template::InvalidKind;
+		};
+
+		if (ImGui::Button(ls->Add.Get())) {
+			ImGui::OpenPopup("Create template");
+		}
+		if (ImGui::BeginPopupModal("Create template")) {
+			if (ImGui::InputText("Name", &newName)) {
+				ValidateNewName();
+			}
+
+			if (ImGui::BeginCombo("Type", Template::FormatKind(newKind))) {
+				for (int i = 0; i < Template::KindCount; ++i) {
+					auto kind = static_cast<Template::Kind>(i);
+					if (ImGui::Selectable(Template::FormatKind(kind), newKind == kind)) {
+						newKind = kind;
+					}
+				}
+				ImGui::EndCombo();
+			}
+
+			if (ImGui::Button(ls->DialogConfirm.Get(), IsInputValid())) {
+				auto& project = *uis.CurrentProject;
+
+				auto& info = *project.InsertTemplate(
+					newName,
+					TemplateInfo{
+						.Path = project.GetTemplatePath(newName),
+						.Name = newName, // Don't std::move here because evaluation order of `newName` (as parameter of InsertTemplate()) and this is unspecified
+						.Kind = newKind,
+					});
+
+				auto tmpl = Template::CreateByKind(newKind);
+
+				std::ofstream ofs(info.Path);
+				if (ofs) {
+					tmpl->WriteTo(ofs);
+				} else {
+					// Writing to disk here isn't necessary for downstream operations to function successfully;
+					// if the user makes any changes and don't save, those changes will not persist anyways
+					// if the user doesn't make any changes, it doesn't matter that the empty template file isn't created yet
+				}
+
+				openTemplate = std::make_unique<TableTemplateUI>(std::move(tmpl));
+			}
+			ImGui::SameLine();
+			if (ImGui::Button(ls->DialogCancel.Get())) {
+				ImGui::CloseCurrentPopup();
+			}
+
+			ShowNewNameErrors();
+			ShowNewKindErrors();
+
+			ImGui::EndPopup();
+		}
+
+		if (ImGui::Button(ls->Rename.Get(), state.SelectedTemplate == nullptr)) {
+			ImGui::OpenPopup("Rename template");
+			newName.clear();
+		}
+		if (ImGui::BeginPopupModal("Rename template")) {
+			if (ImGui::InputText("New name", &newName)) {
+				ValidateNewName();
+			}
+
+			if (ImGui::Button(ls->DialogConfirm.Get(), IsInputValid())) {
+				auto& project = *uis.CurrentProject;
+
+				project.RenameTemplate(
+					state.SelectedTemplate->Name,
+					newName);
+
+				// We mutated the map, the pointer may be invalid now
+				state.SelectedTemplate = &project.GetTemplates().at(newName);
+			}
+			ImGui::SameLine();
+			if (ImGui::Button(ls->DialogCancel.Get())) {
+				ImGui::CloseCurrentPopup();
+			}
+
+			ShowNewNameErrors();
+
+			ImGui::EndPopup();
+		}
+
+		if (ImGui::Button(ls->Delete.Get(), state.SelectedTemplate == nullptr)) {
+			ImGui::OpenPopup("Delete confirmation");
+		}
+		if (ImGui::BeginPopupModal("Delete confirmation")) {
+			assert(state.SelectedTemplate != nullptr);
+
+			if (ImGui::Button(ls->DialogConfirm.Get())) {
+				uis.CurrentProject->RemoveTemplate(state.SelectedTemplate->Name);
+			}
+			ImGui::SameLine();
+			if (ImGui::Button(ls->DialogCancel.Get())) {
+				ImGui::CloseCurrentPopup();
+			}
+			ImGui::EndPopup();
+		}
+
+		ImGui::EndPopup();
+	}
+}
diff --git a/core/src/UI/UI_Workflows.cpp b/core/src/UI/UI_Workflows.cpp
index feebe89..ac023c9 100644
--- a/core/src/UI/UI_Workflows.cpp
+++ b/core/src/UI/UI_Workflows.cpp
@@ -359,12 +359,12 @@ public:
 	}
 };
 
-struct DrawWorkflowList_State
+struct DrawTemplateList_State
 {
 	const WorkflowInfo* SelectedWorkflow = nullptr;
 };
 
-void DrawWorkflowList(DrawWorkflowList_State& state)
+void DrawTemplateList(DrawTemplateList_State& state)
 {
 	auto& uis = UIState::GetInstance();
 	auto& workflows = uis.CurrentProject->GetWorkflows();
@@ -390,7 +390,7 @@ void UI::WorkflowsTab()
 
 	bool openedDummy = true;
 	static std::unique_ptr<WorkflowUI> openWorkflow;
-	static DrawWorkflowList_State state;
+	static DrawTemplateList_State state;
 
 	// Toolbar item: close
 	if (ImGui::Button(ls->Close.Get(), openWorkflow == nullptr)) {
@@ -403,7 +403,7 @@ void UI::WorkflowsTab()
 		ImGui::OpenPopup(ls->OpenWorkflowDialogTitle.Get());
 	}
 	if (ImGui::BeginPopupModal(ls->OpenWorkflowDialogTitle.Get(), &openedDummy, ImGuiWindowFlags_AlwaysAutoResize)) {
-		DrawWorkflowList(state);
+		DrawTemplateList(state);
 
 		if (state.SelectedWorkflow) {
 			auto workflow = state.SelectedWorkflow->LoadFromDisk();
@@ -419,7 +419,7 @@ void UI::WorkflowsTab()
 		ImGui::OpenPopup(ls->ManageWorkflowsDialogTitle.Get());
 	}
 	if (ImGui::BeginPopupModal(ls->ManageWorkflowsDialogTitle.Get(), &openedDummy, ImGuiWindowFlags_AlwaysAutoResize)) {
-		DrawWorkflowList(state);
+		DrawTemplateList(state);
 
 		enum class NameSelectionError
 		{
@@ -448,7 +448,7 @@ void UI::WorkflowsTab()
 			if (ImGui::Button(ls->DialogConfirm.Get(), newName.empty())) {
 				auto& project = uis.CurrentProject;
 				project->RenameWorkflow(state.SelectedWorkflow->Name, newName);
-				state.SelectedWorkflow = &project->GetWorkflows()[newName];
+				state.SelectedWorkflow = &project->GetWorkflows().at(newName);
 			}
 			ImGui::SameLine();
 			if (ImGui::Button(ls->DialogCancel.Get())) {