Basic shell working.

TerminalRenderer.cpp

@@ -0,0 +1,74 @@
+#include "TerminalRenderer.h"
+
+#include <ncurses.h>
+#include <cstdio>
+
+#include "Editor.h"
+#include "Buffer.h"
+
+TerminalRenderer::TerminalRenderer() = default;
+
+TerminalRenderer::~TerminalRenderer() = default;
+
+void TerminalRenderer::Draw(const Editor &ed)
+{
+    // Determine terminal size and keep editor dimensions in sync
+    int rows, cols;
+    getmaxyx(stdscr, rows, cols);
+
+    // Clear screen
+    erase();
+
+    const Buffer *buf = ed.CurrentBuffer();
+    int content_rows   = rows - 1; // last line is status
+
+    if (buf) {
+        const auto &lines = buf->Rows();
+        std::size_t rowoffs = buf->Rowoffs();
+        std::size_t coloffs = buf->Coloffs();
+
+        for (int r = 0; r < content_rows; ++r) {
+            int y = r;
+            int x = 0;
+            move(y, x);
+            std::size_t li = rowoffs + static_cast<std::size_t>(r);
+            if (li < lines.size()) {
+                const std::string &line = lines[li];
+                if (coloffs < line.size()) {
+                    // Render a windowed slice of the line
+                    std::size_t len = std::min<std::size_t>(static_cast<std::size_t>(cols), line.size() - coloffs);
+                    addnstr(line.c_str() + static_cast<long>(coloffs), static_cast<int>(len));
+                }
+            }
+            clrtoeol();
+        }
+
+        // Place cursor (best-effort; tabs etc. not handled yet)
+        std::size_t cy = buf->Cury();
+        std::size_t cx = buf->Curx();
+        int cur_y      = static_cast<int>(cy - buf->Rowoffs());
+        int cur_x      = static_cast<int>(cx - buf->Coloffs());
+        if (cur_y >= 0 && cur_y < content_rows && cur_x >= 0 && cur_x < cols) {
+            move(cur_y, cur_x);
+        }
+    } else {
+        mvaddstr(0, 0, "[no buffer]");
+    }
+
+    // Status line (inverse)
+    move(rows - 1, 0);
+    attron(A_REVERSE);
+    char status[1024];
+    const char *fname = (buf && buf->IsFileBacked()) ? buf->Filename().c_str() : "(new)";
+    int dirty = (buf && buf->Dirty()) ? 1 : 0;
+    snprintf(status, sizeof(status), " %s%s  %zux%zu  %s ",
+             fname,
+             dirty ? "*" : "",
+             ed.Rows(), ed.Cols(),
+             ed.Status().c_str());
+    addnstr(status, cols);
+    clrtoeol();
+    attroff(A_REVERSE);
+
+    refresh();
+}