Support empty file-backed buffers.

.idea/workspace.xml

@@ -32,29 +32,10 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="e1fe3ab0-3650-4fca-8664-a247d5dfa457" name="Changes" comment="">
-      <change afterPath="$PROJECT_DIR$/Command.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/Command.h" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/Frontend.h" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/GUIFrontend.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/GUIFrontend.h" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/GUIInputHandler.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/GUIInputHandler.h" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/GUIRenderer.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/GUIRenderer.h" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/InputHandler.h" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/ROADMAP.md" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/Renderer.h" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/TerminalFrontend.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/TerminalFrontend.h" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/TerminalInputHandler.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/TerminalInputHandler.h" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/TerminalRenderer.cpp" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/TerminalRenderer.h" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/.junie/guidelines.md" beforeDir="false" afterPath="$PROJECT_DIR$/.junie/guidelines.md" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/CMakeLists.txt" beforeDir="false" afterPath="$PROJECT_DIR$/CMakeLists.txt" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/GUIRenderer.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/GUIRenderer.cpp" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/README.md" beforeDir="false" afterPath="$PROJECT_DIR$/README.md" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/cmake/packaging.cmake" beforeDir="false" afterPath="$PROJECT_DIR$/cmake/packaging.cmake" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/main.cpp" beforeDir="false" afterPath="$PROJECT_DIR$/main.cpp" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
@@ -142,7 +123,7 @@
       <option name="number" value="Default" />
       <option name="presentableId" value="Default" />
       <updated>1764457173148</updated>
-      <workItem from="1764457174208" duration="9070000" />
+      <workItem from="1764457174208" duration="9674000" />
     </task>
     <servers />
   </component>

Buffer.cpp

@@ -2,6 +2,7 @@
 
 #include <fstream>
 #include <sstream>
+#include <filesystem>
 
 
 Buffer::Buffer() = default;
@@ -17,6 +18,24 @@ Buffer::Buffer(const std::string &path)
 bool
 Buffer::OpenFromFile(const std::string &path, std::string &err)
 {
+    // If the file doesn't exist, initialize an empty, non-file-backed buffer
+    // with the provided filename. Do not touch the filesystem until Save/SaveAs.
+    if (!std::filesystem::exists(path)) {
+        rows_.clear();
+        nrows_          = 0;
+        filename_       = path;
+        is_file_backed_ = false;
+        dirty_          = false;
+
+        // Reset cursor/viewport state
+        curx_      = cury_    = rx_ = 0;
+        rowoffs_   = coloffs_ = 0;
+        mark_set_  = false;
+        mark_curx_ = mark_cury_ = 0;
+
+        return true;
+    }
+
     std::ifstream in(path, std::ios::in | std::ios::binary);
     if (!in) {
         err = "Failed to open file: " + path;

CMakeLists.txt

@@ -44,7 +44,7 @@ endif ()
 find_package(Curses REQUIRED)
 include_directories(${CURSES_INCLUDE_DIR})
 
-set(SOURCES
+set(COMMON_SOURCES
         GapBuffer.cpp
         PieceTable.cpp
         Buffer.cpp
@@ -55,7 +55,7 @@ set(SOURCES
         TerminalFrontend.cpp
 )
 
-set(HEADERS
+set(COMMON_HEADERS
         GapBuffer.h
         PieceTable.h
         Buffer.h
@@ -70,10 +70,11 @@ set(HEADERS
         TerminalFrontend.h
 )
 
+# kte (terminal-first) executable
 add_executable(kte
         main.cpp
-        ${SOURCES}
+        ${COMMON_SOURCES}
-        ${HEADERS}
+        ${COMMON_HEADERS}
 )
 
 if (KTE_USE_PIECE_TABLE)
@@ -83,6 +84,7 @@ endif ()
 target_link_libraries(kte ${CURSES_LIBRARIES})
 
 if (${BUILD_GUI})
+    # Add GUI support to kte so it can be started with -g
     target_sources(kte PRIVATE
             GUIRenderer.cpp
             GUIRenderer.h
@@ -92,4 +94,18 @@ if (${BUILD_GUI})
             GUIFrontend.h)
     target_compile_definitions(kte PRIVATE KTE_BUILD_GUI=1)
     target_link_libraries(kte imgui)
+
+    # kge (GUI-first) executable
+    add_executable(kge
+            main.cpp
+            ${COMMON_SOURCES}
+            ${COMMON_HEADERS}
+            GUIRenderer.cpp
+            GUIRenderer.h
+            GUIInputHandler.cpp
+            GUIInputHandler.h
+            GUIFrontend.cpp
+            GUIFrontend.h)
+    target_compile_definitions(kge PRIVATE KTE_BUILD_GUI=1 KTE_DEFAULT_GUI=1)
+    target_link_libraries(kge ${CURSES_LIBRARIES} imgui)
 endif ()

GUIRenderer.cpp

@@ -7,7 +7,25 @@
 
 void GUIRenderer::Draw(const Editor &ed)
 {
-    ImGui::Begin("kte");
+    // Make the editor window occupy the entire GUI container/viewport
+    ImGuiViewport* vp = ImGui::GetMainViewport();
+    ImGui::SetNextWindowPos(vp->Pos);
+    ImGui::SetNextWindowSize(vp->Size);
+
+    ImGuiWindowFlags flags = ImGuiWindowFlags_NoTitleBar
+                           | ImGuiWindowFlags_NoResize
+                           | ImGuiWindowFlags_NoMove
+                           | ImGuiWindowFlags_NoCollapse
+                           | ImGuiWindowFlags_NoSavedSettings
+                           | ImGuiWindowFlags_NoBringToFrontOnFocus
+                           | ImGuiWindowFlags_NoNavFocus;
+
+    // Reduce padding so the buffer content uses the whole area
+    ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
+    ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
+    ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(6.f, 6.f));
+
+    ImGui::Begin("kte", nullptr, flags);
 
     const Buffer *buf = ed.CurrentBuffer();
     if (!buf) {
@@ -34,4 +52,5 @@ void GUIRenderer::Draw(const Editor &ed)
     }
 
     ImGui::End();
+    ImGui::PopStyleVar(3);
 }

README.md

@@ -180,32 +180,6 @@ Run:
 ./cmake-build-debug/kte [files]
 ```
 
-CLI usage
----------
-
-```
-kte [OPTIONS] [files]
-
-Options:
-  -g, --gui        Use GUI frontend (if built)
-  -t, --term       Use terminal (ncurses) frontend [default]
-  -h, --help       Show help and exit
-  -V, --version    Show version and exit
-```
-
-Examples:
-
-```
-# Terminal (default)
-kte foo.txt bar.txt
-
-# Explicit terminal
-kte -t foo.txt
-
-# GUI (requires building with -DBUILD_GUI=ON and GUI deps installed)
-kte --gui foo.txt
-```
-
 GUI build example
 -----------------
 

main.cpp

@@ -90,8 +90,12 @@ main(int argc, const char *argv[])
     } else if (req_term) {
         use_gui = false;
     } else {
-        // Default to terminal
+        // Default depends on build target: kge defaults to GUI, kte to terminal
+        #if defined(KTE_DEFAULT_GUI)
+            use_gui = true;
+        #else
             use_gui = false;
+        #endif
     }
 #endif