// core
Single-file Design
All application logic lives in neight.py. No external packages beyond PySide6, markdown, and the standard library. Easy to read, audit, and ship.
// structure
Key Classes
NeightApplication handles macOS Open With. Notepad is the main window. CodeEditor drives all editing. Custom layout, find/replace, line numbers, and word index are separate widgets.
Read the developer guide →// background
Background Services
Auto-save writes run on a background thread so the UI never blocks. An update checker and recovery manager run silently. Reading time uses Tamil/English word speed tables.
Performance design notes →