replace ncurses with termios

src/Aquarium.cpp

@@ -8,19 +8,86 @@
 #include "Waterline.h"
 #include "Whale.h"
 #include <algorithm>
+#include <cstdio>
+#include <cstring>
 #include <iostream>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <termios.h>
+#include <unistd.h>
 
 int g_maxCells = 0;
 
+// ANSI color codes
+namespace ANSI {
+const char *RESET = "\033[0m";
+const char *BOLD = "\033[1m";
+const char *CLEAR_SCREEN = "\033[2J";
+const char *CURSOR_HOME = "\033[H";
+const char *HIDE_CURSOR = "\033[?25l";
+const char *SHOW_CURSOR = "\033[?25h";
+
+// Colors (foreground)
+const char *BLACK = "\033[30m";
+const char *RED = "\033[31m";
+const char *GREEN = "\033[32m";
+const char *YELLOW = "\033[33m";
+const char *BLUE = "\033[34m";
+const char *MAGENTA = "\033[35m";
+const char *CYAN = "\033[36m";
+const char *WHITE = "\033[37m";
+
+// Move cursor to position
+std::string moveTo(int row, int col) {
+  char buffer[32];
+  snprintf(buffer, sizeof(buffer), "\033[%d;%dH", row + 1, col + 1);
+  return std::string(buffer);
+}
+} // namespace ANSI
+
+// Global terminal state
+static struct termios original_termios;
+static bool termios_saved = false;
+
+// Signal handler for cleanup
+void cleanup_terminal(int sig) {
+  if (termios_saved) {
+    tcsetattr(STDIN_FILENO, TCSANOW, &original_termios);
+  }
+  printf("%s%s", ANSI::SHOW_CURSOR, ANSI::RESET);
+  fflush(stdout);
+  if (sig != 0) {
+    exit(sig);
+  }
+}
+
 Aquarium::Aquarium() {
-  initscr();
-  noecho();
-  cbreak();
-  nodelay(stdscr, TRUE);
-  curs_set(0);
-  initColors();
-  timeout(100);
-  getmaxyx(stdscr, height, width);
+  // Save original terminal settings
+  if (tcgetattr(STDIN_FILENO, &original_termios) == 0) {
+    termios_saved = true;
+  }
+
+  // Set up signal handlers for cleanup
+  signal(SIGINT, cleanup_terminal);
+  signal(SIGTERM, cleanup_terminal);
+  signal(SIGQUIT, cleanup_terminal);
+
+  // Set terminal to raw mode
+  struct termios raw = original_termios;
+  raw.c_lflag &= ~(ECHO | ICANON | ISIG);
+  raw.c_iflag &= ~(IXON | ICRNL);
+  raw.c_oflag &= ~(OPOST);
+  raw.c_cc[VMIN] = 0;  // Non-blocking read
+  raw.c_cc[VTIME] = 1; // 100ms timeout
+
+  tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
+
+  // Initialize display
+  printf("%s%s%s", ANSI::CLEAR_SCREEN, ANSI::CURSOR_HOME, ANSI::HIDE_CURSOR);
+  fflush(stdout);
+
+  // Get terminal size
+  getTerminalSize();
 
   currentFrame.assign(height, std::vector<Cell>(width));
   previousFrame.assign(height, std::vector<Cell>(width));
@@ -31,6 +98,18 @@ Aquarium::Aquarium() {
   }
 }
 
+void Aquarium::getTerminalSize() {
+  struct winsize ws;
+  if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0) {
+    height = ws.ws_row;
+    width = ws.ws_col;
+  } else {
+    // Fallback to reasonable defaults
+    height = 24;
+    width = 80;
+  }
+}
+
 void Aquarium::ensureEntitiesSorted() {
   if (entities_need_sorting) {
     std::sort(entities.begin(), entities.end(),
@@ -109,11 +188,13 @@ void Aquarium::redraw() {
 }
 
 void Aquarium::resize() {
-  clear();
-  getmaxyx(stdscr, height, width);
+  printf("%s%s", ANSI::CLEAR_SCREEN, ANSI::CURSOR_HOME);
+  fflush(stdout);
+
+  getTerminalSize();
 
   if (g_maxCells && height * width > g_maxCells) {
-    endwin();
+    cleanup_terminal(0);
     std::cerr << "Error: Terminal too large. Maximum allowed area is "
               << g_maxCells << " cells, but current size is "
               << (height * width) << ".\n";
@@ -191,18 +272,28 @@ void Aquarium::drawToFrame(int y, int x, const std::string &line,
 
 void Aquarium::initColorLookup() {
   for (int i = 0; i < 256; ++i)
-    colorLookup[i] = 8; // Default black
-  colorLookup['r'] = 1;
-  colorLookup['g'] = 2;
-  colorLookup['y'] = 3;
-  colorLookup['b'] = 4;
-  colorLookup['m'] = 5;
-  colorLookup['c'] = 6;
-  colorLookup['w'] = 7;
-  colorLookup['k'] = 8;
+    colorLookup[i] = ANSI::BLACK; // Default black
+
+  colorLookup['r'] = ANSI::RED;
+  colorLookup['g'] = ANSI::GREEN;
+  colorLookup['y'] = ANSI::YELLOW;
+  colorLookup['b'] = ANSI::BLUE;
+  colorLookup['m'] = ANSI::MAGENTA;
+  colorLookup['c'] = ANSI::CYAN;
+  colorLookup['w'] = ANSI::WHITE;
+  colorLookup['k'] = ANSI::BLACK;
+}
+
+void Aquarium::initColors() {
+  // This function is kept for compatibility but does nothing
+  // since we're using ANSI colors directly
 }
 
 void Aquarium::renderToScreen() {
+  static std::string output;
+  output.clear();
+  output.reserve(height * width * 20); // Reserve space for efficiency
+
   for (int y = 0; y < height; ++y) {
     for (int x = 0; x < width; ++x) {
       const Cell &newCell = currentFrame[y][x];
@@ -210,30 +301,48 @@ void Aquarium::renderToScreen() {
 
       if (newCell != oldCell) {
         oldCell = newCell;
-        move(y, x);
 
-        int colorPair =
-            colorLookup[static_cast<unsigned char>(newCell.colorChar)];
-        attrset(COLOR_PAIR(colorPair) | (newCell.bold ? A_BOLD : A_NORMAL));
-        addch(newCell.ch);
+        // Move cursor to position
+        output += ANSI::moveTo(y, x);
+
+        // Set color and attributes
+        output += ANSI::RESET; // Reset first
+        if (newCell.bold) {
+          output += ANSI::BOLD;
+        }
+        output += colorLookup[static_cast<unsigned char>(newCell.colorChar)];
+
+        // Add the character
+        output += newCell.ch;
       }
     }
   }
-  refresh();
-}
 
-void Aquarium::initColors() {
-  if (has_colors()) {
-    start_color();
-    init_pair(1, COLOR_RED, COLOR_BLACK);
-    init_pair(2, COLOR_GREEN, COLOR_BLACK);
-    init_pair(3, COLOR_YELLOW, COLOR_BLACK);
-    init_pair(4, COLOR_BLUE, COLOR_BLACK);
-    init_pair(5, COLOR_MAGENTA, COLOR_BLACK);
-    init_pair(6, COLOR_CYAN, COLOR_BLACK);
-    init_pair(7, COLOR_WHITE, COLOR_BLACK);
-    init_pair(8, COLOR_BLACK, COLOR_BLACK);
+  // Output everything at once for better performance
+  if (!output.empty()) {
+    printf("%s", output.c_str());
+    fflush(stdout);
   }
 }
 
-Aquarium::~Aquarium() { endwin(); }
+// Check for input (non-blocking)
+int Aquarium::checkInput() {
+  char c;
+  if (read(STDIN_FILENO, &c, 1) == 1) {
+    return c;
+  }
+  return -1; // No input available
+}
+
+// Check if terminal was resized (you'll need to call this periodically)
+bool Aquarium::checkResize() {
+  struct winsize ws;
+  if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0) {
+    if (ws.ws_row != height || ws.ws_col != width) {
+      return true;
+    }
+  }
+  return false;
+}
+
+Aquarium::~Aquarium() { cleanup_terminal(0); }