pferd/PFERD/utils.py
2020-04-23 17:40:43 +00:00

140 lines
3.8 KiB
Python

"""
A few utility bobs and bits.
"""
import logging
from pathlib import Path, PurePath
from typing import Optional, Tuple
import bs4
import requests
from colorama import Fore, Style
def move(path: PurePath, from_folders: Tuple[str], to_folders: Tuple[str]) -> Optional[PurePath]:
"""
If the input path is located anywhere within from_folders, replace the
from_folders with to_folders. Returns None otherwise.
"""
length = len(from_folders)
if path.parts[:length] == from_folders:
return PurePath(*to_folders, *path.parts[length:])
return None
def rename(path: PurePath, to_name: str) -> PurePath:
"""
Set the file name of the input path to to_name.
"""
return PurePath(*path.parts[:-1], to_name)
def soupify(response: requests.Response) -> bs4.BeautifulSoup:
"""
Wrap a requests response in a bs4 object.
"""
return bs4.BeautifulSoup(response.text, "html.parser")
def stream_to_path(response: requests.Response, to_path: Path, chunk_size: int = 1024 ** 2) -> None:
"""
Download a requests response content to a file by streaming it. This
function avoids excessive memory usage when downloading large files. The
chunk_size is in bytes.
"""
with response:
with open(to_path, 'wb') as file_descriptor:
for chunk in response.iter_content(chunk_size=chunk_size):
file_descriptor.write(chunk)
def prompt_yes_no(question: str, default: Optional[bool] = None) -> bool:
"""
Prompts the user a yes/no question and returns their choice.
"""
if default is True:
prompt = "[Y/n]"
elif default is False:
prompt = "[y/N]"
else:
prompt = "[y/n]"
text = f"{question} {prompt} "
wrong_reply = "Please reply with 'yes'/'y' or 'no'/'n'."
while True:
response = input(text).strip().lower()
if response in {"yes", "ye", "y"}:
return True
if response in {"no", "n"}:
return False
if response == "" and default is not None:
return default
print(wrong_reply)
class PrettyLogger:
"""
A logger that prints some specially formatted log messages in color.
"""
def __init__(self, logger: logging.Logger) -> None:
self.logger = logger
def modified_file(self, file_name: PurePath) -> None:
"""
An existing file has changed.
"""
self.logger.info(
f"{Fore.MAGENTA}{Style.BRIGHT}Modified {str(file_name)!r}.{Style.RESET_ALL}"
)
def new_file(self, file_name: PurePath) -> None:
"""
A new file has been downloaded.
"""
self.logger.info(
f"{Fore.GREEN}{Style.BRIGHT}Created {str(file_name)!r}.{Style.RESET_ALL}")
def ignored_file(self, file_name: PurePath) -> None:
"""
Nothing in particular happened to this file or directory.
"""
self.logger.info(f"{Style.DIM}Ignored {str(file_name)!r}.{Style.RESET_ALL}")
def filtered_path(self, path: PurePath, reason: str) -> None:
"""
A crawler filter rejected the given path.
"""
self.logger.info(
f"{Style.DIM}Not considering {str(path)!r} due to filter rules"
f" ({Style.NORMAL}{reason}{Style.DIM})."
f"{Style.RESET_ALL}"
)
def starting_synchronizer(
self,
target_directory: Path,
synchronizer_name: str,
subject: Optional[str] = None,
) -> None:
"""
A special message marking that a synchronizer has been started.
"""
subject_str = f"{subject} " if subject else ""
self.logger.info("")
self.logger.info((
f"{Fore.CYAN}{Style.BRIGHT}Synchronizing {subject_str}to {str(target_directory)!r}"
f" using the {synchronizer_name} synchronizer.{Style.RESET_ALL}"
))