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+#!/usr/bin/env python3
+# File: jellystack.py
+# Location: /mnt/public/Support/Programs/jellyfin/scripts/
+# Author: bgstack15
+# Startdate: 2024-01-29-2 09:25
+# SPDX-License-Identifier: GPL-3.0-only
+# Title: jellyfin stackrpms cli frontend
+# Project: jellystack
+# Purpose: List and rescan individual libraries in jellyfin easier than navigating web ui
+# History:
+# Usage:
+#    from rescan-library.sh
+# Reference:
+#    https://stackoverflow.com/questions/8258145/in-python-check-if-file-modification-time-is-older-than-a-specific-datetime
+# Improve:
+# Dependencies:
+#    jellystack_lib.py, python>=3.4
+# Documentation:
+import jellystack_lib as js, os, argparse, shutil, sys
+from datetime import datetime, timedelta
+from pathlib import Path # python>=3.4
+js_debug = False
+
+# Ref: https://stackoverflow.com/questions/8258145/in-python-check-if-file-modification-time-is-older-than-a-specific-datetime
+def is_file_older_than (file, delta):
+   cutoff = datetime.utcnow() - delta
+   mtime = datetime.utcfromtimestamp(os.path.getmtime(file))
+   if mtime < cutoff:
+      return True
+   return False
+
+def check_cached_library_names(clear_cache = False):
+   """
+   If cache is absent or older than 23 hours, generate new cache of library names
+   """
+   cache_dir = os.path.join(os.path.expanduser("~"),".cache","jellystack")
+   _clear_cache = clear_cache
+   _cache_is_empty = True
+   try:
+      os.mkdir(cache_dir)
+   except:
+      pass
+   for thisdir, subdir, files in os.walk(cache_dir):
+      for tf in files:
+         if is_file_older_than(os.path.join(thisdir,tf), timedelta(hours=23)):
+            _clear_cache = True
+            if js_debug:
+               print(f"found too-old file {tf}, will clear the cache.",file=sys.stderr)
+            break
+   if _clear_cache:
+      shutil.rmtree(cache_dir)
+      if js_debug:
+         print(f"Clearing cache...",file=sys.stderr)
+   try:
+      os.mkdir(cache_dir)
+   except:
+      pass
+   # populate cache
+   try:
+      for thisdir, subdir, files in os.walk(cache_dir):
+         if len(files) > 0:
+            _cache_is_empty = False
+   except:
+      pass
+   if _cache_is_empty:
+      if js_debug:
+         print(f"Generating cache...",file=sys.stderr)
+      client = get_client()
+      lib_names = js.get_library_names_only(js.get_media_folders(client))
+      #print(lib_names)
+      for name in lib_names:
+         Path(os.path.join(cache_dir,name)).touch()
+   # and now, list all the files in that path
+   for thisdir, subdir, files in os.walk(cache_dir):
+      for tf in files:
+         print(tf)
+
+def get_client():
+   try:
+      client = js.get_authenticated_client(server,user,pw)
+   except:
+      raise Exception("Check password or url?")
+   return client
+
+if "__main__" == __name__:
+   server = os.environ.get("server","http://vm4:8096")
+   user = os.environ.get("username","admin")
+   pw = os.environ.get("password","none")
+   pwfile = os.path.join(os.path.expanduser("~"),".jellyfin.password")
+   if pw == "none":
+      #raise Exception(f"Set env var \"password\" and try again.")
+      if os.path.exists(pwfile):
+         try:
+            with open(pwfile,"r") as o:
+               pw = o.read().strip()
+               # the strip helps remove the newline that most people stick at the end of passwords in a passwordfile, and I seriously doubt the newline is part of the password.
+         except:
+            pass
+   parser = argparse.ArgumentParser()
+   parser.add_argument("--autocomplete",action="store_true",help="print library names, using the cache.")
+   parser.add_argument("--clear-cache",action="store_true",help="print library names, using the cache.")
+   parser.add_argument("--library",help="Rescan this library by name or uuid.")
+   args = parser.parse_args()
+   if type(args.library) == str:
+      args.library = args.library.rstrip("/") # to help with the bash autocomplete which always wants to add a trailing slash, if PWD has a directory named exactly the same as the library. I cannot find a way around it.
+   #print(args,file=sys.stderr)
+   if args.autocomplete:
+      check_cached_library_names(args.clear_cache)
+   else:
+      client = get_client()
+      folders = js.get_media_folders(client)
+      if args.library is not None:
+         js.refresh_library(args.library, folders, client)
+      else:
+         print("Use --autocomplete, or one of these for --library:")
+         js.libraries_to_csv(folders)