removed highlighting text. Added in magnifying words left side, sync scrolling, keyboard shortcuts, editing text etc

launch_viewer.py

@@ -1,45 +1,112 @@
 #!/usr/bin/env python3
 """
-P44 OCR Viewer — launcher
+P44 OCR Viewer launcher.
 Starts a local HTTP server at port 5044 and opens the viewer in the default browser.
 Run from any directory; the server root is always the project folder (this file's location).
+If port 5044 is already in use (server already running), just opens the browser tab.
 """
 import http.server
 import webbrowser
 import threading
+import socket
 import os
 import sys
+import json
 
 PORT = 5044
 ROOT = os.path.dirname(os.path.abspath(__file__))
 
+
 class QuietHandler(http.server.SimpleHTTPRequestHandler):
-    """Serve files from ROOT, suppress request logs."""
+    """Serve files from ROOT, suppress request logs, disable browser caching."""
     def __init__(self, *args, **kwargs):
         super().__init__(*args, directory=ROOT, **kwargs)
+
     def log_message(self, fmt, *args):
         pass  # silence per-request noise
 
+    def end_headers(self):
+        self.send_header('Cache-Control', 'no-store, no-cache, must-revalidate')
+        self.send_header('Pragma', 'no-cache')
+        self.send_header('Expires', '0')
+        super().end_headers()
+
+    def do_POST(self):
+        """Handle POST /save-flags and POST /save-corrections."""
+        length = int(self.headers.get('Content-Length', 0))
+        body   = self.rfile.read(length)
+        try:
+            data = json.loads(body)
+        except json.JSONDecodeError:
+            self.send_response(400); self.end_headers()
+            return
+
+        if self.path == '/save-flags':
+            dest = os.path.join(ROOT, 'flags.json')
+            with open(dest, 'w', encoding='utf-8') as f:
+                json.dump(data, f, indent=2)
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(b'{"ok":true}')
+
+        elif self.path == '/save-corrections':
+            dest = os.path.join(ROOT, 'corrections.json')
+            # Load existing, update single page entry, write back
+            existing = {}
+            if os.path.exists(dest):
+                try:
+                    with open(dest, 'r', encoding='utf-8') as f:
+                        existing = json.load(f)
+                except Exception:
+                    pass
+            page = str(data.get('page', ''))
+            text = data.get('text', '')
+            if text.strip():
+                existing[page] = text
+            else:
+                existing.pop(page, None)
+            with open(dest, 'w', encoding='utf-8') as f:
+                json.dump(existing, f, indent=2)
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/json')
+            self.end_headers()
+            self.wfile.write(b'{"ok":true}')
+
+        else:
+            self.send_response(404); self.end_headers()
+
+
+def port_in_use(port):
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+        return s.connect_ex(('localhost', port)) == 0
+
+
 def start_server():
     server = http.server.HTTPServer(('localhost', PORT), QuietHandler)
     server.serve_forever()
 
+
 if __name__ == '__main__':
-    # Start the server in a background daemon thread
-    t = threading.Thread(target=start_server, daemon=True)
-    t.start()
+    url = 'http://localhost:{}/p44-ocr-viewer.html'.format(PORT)
 
-    url = f'http://localhost:{PORT}/p44-ocr-viewer.html'
-    print(f"\n  ⚜  P44 OCR Viewer")
-    print(f"     Serving: {ROOT}")
-    print(f"     URL:     {url}\n")
-    webbrowser.open(url)
+    if port_in_use(PORT):
+        print('\n  P44 OCR Viewer  (server already running)')
+        print('  URL: {}\n'.format(url))
+        webbrowser.open(url)
+    else:
+        t = threading.Thread(target=start_server, daemon=True)
+        t.start()
+        print('\n  P44 OCR Viewer')
+        print('  Serving : {}'.format(ROOT))
+        print('  URL     : {}\n'.format(url))
+        webbrowser.open(url)
 
-    print("Press Enter (or Ctrl-C) to stop the server and exit.\n")
+    print('Press Enter (or Ctrl-C) to stop the server.\n')
     try:
         input()
     except KeyboardInterrupt:
         pass
-    print("Server stopped.")
+    print('Server stopped.')
     sys.exit(0)