Script to check if file is already in Voice Dream Reader library

check_vdr_library.py

"""Script to check if file is already in Voice Dream Reader library.

I use this script w/in another to open the Reader programmatically with
a new file added if it isn't already in the library.:

The following in the terminal will add the FILENAME to the library
even if already used:
open -a "Voice Dream Reader" FILENAME

Python snippet from external script:
if check_vdr_library.is_filename_in_library(FILENAME):
    subprocess.Popen(
        [
            "open",
            "-a",
            "Voice Dream Reader"
        ]
    )
else:
    subprocess.Popen(
        [
            "open",
            "-a",
            "Voice Dream Reader",
            "/Users/dsg/Documents/pdfs/{}.pdf".format(FILENAME),
        ]
    )

"""

# Imports
import os

# Constants

# This may be different if you do not have Preference > Cloud Sync turned on.
# change 'dsg' for your username.
VDR_LIBRARY_DIR = "/Users/dsg/Library/Mobile Documents/iCloud~com~voicedream~reader/Documents/Library/"

# Body
def generate_filenames():
    """Generator expressions returning each filename in the library."""
    for folder in os.listdir(VDR_LIBRARY_DIR):
        if os.path.isdir(VDR_LIBRARY_DIR+folder):
            for filename in os.listdir(VDR_LIBRARY_DIR+folder):
                if filename.endswith(".pdf"):
                    yield filename

def is_filename_in_library(checking_filename):
    """Returns bool if checking_filename in library.

    check_filename: str w/ or w/o .pdf
    """
    for filename in generate_filenames():
        if checking_filename in filename:
            return True
    return False