Basic shell working.

GUIRenderer.cpp

@@ -0,0 +1,37 @@
+#include "GUIRenderer.h"
+
+#include "Editor.h"
+#include "Buffer.h"
+
+#include <imgui.h>
+
+void GUIRenderer::Draw(const Editor &ed)
+{
+    ImGui::Begin("kte");
+
+    const Buffer *buf = ed.CurrentBuffer();
+    if (!buf) {
+        ImGui::TextUnformatted("[no buffer]");
+    } else {
+        const auto &lines = buf->Rows();
+        // Reserve space for status bar at bottom
+        ImGui::BeginChild("scroll", ImVec2(0, -ImGui::GetFrameHeightWithSpacing()), false, ImGuiWindowFlags_HorizontalScrollbar);
+        std::size_t rowoffs = buf->Rowoffs();
+        for (std::size_t i = rowoffs; i < lines.size(); ++i) {
+            ImGui::TextUnformatted(lines[i].c_str());
+        }
+        ImGui::EndChild();
+
+        // Status bar
+        ImGui::Separator();
+        const char *fname = (buf->IsFileBacked()) ? buf->Filename().c_str() : "(new)";
+        bool dirty = buf->Dirty();
+        ImGui::Text("%s%s  %zux%zu  %s",
+                    fname,
+                    dirty ? "*" : "",
+                    ed.Rows(), ed.Cols(),
+                    ed.Status().c_str());
+    }
+
+    ImGui::End();
+}