From 469a4226815e8527dfaa29f4f7babe4079ea7438 Mon Sep 17 00:00:00 2001
From: Ari Vuollet <ari.vuollet@goat.moe>
Date: Wed, 17 Dec 2025 03:29:43 +0200
Subject: [PATCH] Add `-lastproject` editor command-line option to open the
 last project

---
 Source/Editor/Editor.cpp             | 7 +++++++
 Source/Engine/Engine/CommandLine.cpp | 1 +
 Source/Engine/Engine/CommandLine.h   | 5 +++++
 3 files changed, 13 insertions(+)

diff --git a/Source/Editor/Editor.cpp b/Source/Editor/Editor.cpp
index 92c15f591..e82be1128 100644
--- a/Source/Editor/Editor.cpp
+++ b/Source/Editor/Editor.cpp
@@ -537,6 +537,13 @@ int32 Editor::LoadProduct()
     if (FileSystem::FileExists(lastProjectSettingPath))
         File::ReadAllText(lastProjectSettingPath, lastProjectPath);
 
+    // Try to open the last project when requested
+    if (projectPath.IsEmpty() && CommandLine::Options.LastProject.IsTrue())
+    {
+        if (!lastProjectPath.IsEmpty() && FileSystem::DirectoryExists(lastProjectPath))
+            projectPath = lastProjectPath;
+    }
+
     // Missing project case
     if (projectPath.IsEmpty())
     {
diff --git a/Source/Engine/Engine/CommandLine.cpp b/Source/Engine/Engine/CommandLine.cpp
index 229b18834..a717a45a2 100644
--- a/Source/Engine/Engine/CommandLine.cpp
+++ b/Source/Engine/Engine/CommandLine.cpp
@@ -155,6 +155,7 @@ bool CommandLine::Parse(const Char* cmdLine)
     PARSE_BOOL_SWITCH("-clearcache ", ClearCache);
     PARSE_BOOL_SWITCH("-clearcooker ", ClearCookerCache);
     PARSE_ARG_SWITCH("-project ", Project);
+    PARSE_BOOL_SWITCH("-lastproject ", LastProject);
     PARSE_BOOL_SWITCH("-new ", NewProject);
     PARSE_BOOL_SWITCH("-genprojectfiles ", GenProjectFiles);
     PARSE_ARG_SWITCH("-build ", Build);
diff --git a/Source/Engine/Engine/CommandLine.h b/Source/Engine/Engine/CommandLine.h
index 76ff83472..77a573a0a 100644
--- a/Source/Engine/Engine/CommandLine.h
+++ b/Source/Engine/Engine/CommandLine.h
@@ -147,6 +147,11 @@ public:
         /// </summary>
         String Project;
 
+        /// <summary>
+        /// -lastproject (Opens the last project)
+        /// </summary>
+        Nullable<bool> LastProject;
+
         /// <summary>
         /// -new (generates the project files inside the specified project folder or uses current workspace folder)
         /// </summary>