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Bebop/bebop/fs.py

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"""Retrieve some paths from filesystem.
A lot of logic comes from `appdirs`:
https://github.com/ActiveState/appdirs/blob/master/appdirs.py
"""
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from functools import lru_cache
from os import getenv
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from os.path import expanduser
from pathlib import Path
from typing import Optional
APP_NAME = "bebop"
@lru_cache(None)
def get_config_path() -> Path:
"""Return the user config file path."""
config_dir = Path(getenv("XDG_CONFIG_HOME", expanduser("~/.config")))
return config_dir / (APP_NAME + ".json")
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@lru_cache(None)
def get_user_data_path() -> Path:
"""Return the user data directory path."""
path = Path(getenv("XDG_DATA_HOME", expanduser("~/.local/share")))
return path / APP_NAME
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@lru_cache(None)
def get_downloads_path() -> Path:
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"""Return the user downloads directory path (fallbacks to home dir)."""
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xdg_config_path = Path(getenv("XDG_CONFIG_HOME", expanduser("~/.config")))
download_path = ""
try:
with open(xdg_config_path / "user-dirs.dirs", "rt") as user_dirs_file:
for line in user_dirs_file:
if line.startswith("XDG_DOWNLOAD_DIR="):
download_path = line.rstrip().split("=", maxsplit=1)[1]
download_path = download_path.strip('"')
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home = expanduser("~")
download_path = download_path.replace("$HOME", home)
return Path(download_path)
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except OSError:
pass
return Path.home()
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@lru_cache(None)
def get_identities_list_path():
"""Return the identities JSON file path."""
return get_user_data_path() / "identities.json"
@lru_cache(None)
def get_identities_path():
"""Return the directory where identities are stored."""
return get_user_data_path() / "identities"
@lru_cache(None)
def get_capsule_prefs_path():
"""Return the directory where identities are stored."""
return get_user_data_path() / "capsule_prefs.json"
def ensure_bebop_files_exist() -> Optional[str]:
"""Ensure various Bebop's files or directories are present.
Returns:
None if all files and directories are present, an error string otherwise.
"""
try:
# Ensure the user data directory exists.
user_data_path = get_user_data_path()
if not user_data_path.exists():
user_data_path.mkdir(parents=True)
# Ensure the identities file and directory exists.
identities_file_path = get_identities_list_path()
if not identities_file_path.exists():
with open(identities_file_path, "wt") as identities_file:
identities_file.write("{}")
identities_path = get_identities_path()
if not identities_path.exists():
identities_path.mkdir(parents=True)
# Ensure the capsule preferences file exists.
capsule_prefs_path = get_capsule_prefs_path()
if not capsule_prefs_path.exists():
with open(capsule_prefs_path, "wt") as prefs_file:
prefs_file.write("{}")
except OSError as exc:
return str(exc)