Update nn

Exclude hidden files per default. Use `-a` to include them

bin/nn

@@ -6,6 +6,8 @@ import re
 import shutil
 import subprocess
 import sys
+import termios
+import tty
 from datetime import datetime
 from pathlib import Path
 
@@ -24,6 +26,9 @@ TELEGRAM_PATTERN = re.compile(
 
 NORMALIZED = re.compile(r'^\d{4}-\d{2}-\d{2} .+')
 
+# Windows hidden-file attribute, mirrored from the stat module.
+FILE_ATTRIBUTE_HIDDEN = 0x2
+
 STATUS_RENAME = 'rename'
 STATUS_ALREADY = 'skip (already normalized)'
 STATUS_NO_MATCH = 'skip (no rule matched)'
@@ -146,7 +151,19 @@ def get_date_for_file(filepath, parse_mode):
     return None
 
 
-def collect_files(paths):
+def is_hidden(filepath):
+    """Check whether a file is hidden (dotfile, or hidden attribute on Windows)."""
+    if filepath.name.startswith('.'):
+        return True
+
+    try:
+        attrs = filepath.stat().st_file_attributes
+    except (AttributeError, OSError):
+        return False
+    return bool(attrs & FILE_ATTRIBUTE_HIDDEN)
+
+
+def collect_files(paths, include_hidden=False):
     """Resolve the list of files to process."""
     if not paths:
         paths = ['.']
@@ -155,8 +172,12 @@ def collect_files(paths):
     for path in paths:
         candidate = Path(path)
         if candidate.is_dir():
-            files.extend(sorted(file for file in candidate.iterdir() if file.is_file()))
+            files.extend(sorted(
+                file for file in candidate.iterdir()
+                if file.is_file() and (include_hidden or not is_hidden(file))
+            ))
         elif candidate.is_file():
+            # Explicitly named files are always processed.
             files.append(candidate)
     return files
 
@@ -273,13 +294,23 @@ def apply_renames(plan):
 
 
 def confirm(prompt='Apply renames? [y/n] '):
-    """Ask the user for confirmation."""
-    while True:
-        answer = input(prompt).strip().lower()
-        if answer == 'y':
-            return True
-        if answer == 'n':
-            return False
+    """Ask the user for confirmation, reacting to a single keypress."""
+    print(prompt, end='', flush=True)
+    if not sys.stdin.isatty():
+        return sys.stdin.read(1).strip().lower() == 'y'
+
+    fd = sys.stdin.fileno()
+    old_settings = termios.tcgetattr(fd)
+    try:
+        # cbreak (not raw) keeps Ctrl-C as SIGINT and newlines well behaved.
+        tty.setcbreak(fd)
+        while (key := sys.stdin.read(1).lower()) not in ('y', 'n', ''):
+            pass
+    finally:
+        termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
+
+    print(key)
+    return key == 'y'
 
 
 def main():
@@ -306,6 +337,12 @@ def main():
         action='store_true',
         help='Force numbering even for already-normalized files (used with -n).',
     )
+    parser.add_argument(
+        '-a',
+        '--all',
+        action='store_true',
+        help='Include hidden files when scanning directories.',
+    )
     parser.add_argument(
         'files',
         nargs='*',
@@ -314,7 +351,7 @@ def main():
 
     args = parser.parse_args()
 
-    files = collect_files(args.files)
+    files = collect_files(args.files, args.all)
     if not files:
         print('No files found.')
         sys.exit(0)
@@ -337,4 +374,8 @@ def main():
 
 
 if __name__ == '__main__':
+    try:
         main()
+    except KeyboardInterrupt:
+        print('\nAborted.')
+        sys.exit(1)