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Bebop/bebop/preferences.py

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"""Per-capsule preferences.
Currently contains only overrides for render modes, per URL path. In the future
it may be interesting to move a few things from the config to here, such as the
text width.
This is a map from an URL to dicts. The only used key is render_mode.
"""
import json
import logging
from pathlib import Path
from typing import Optional
def load_capsule_prefs(prefs_path: Path) -> Optional[dict]:
"""Return saved capsule preferences or None on error."""
prefs = {}
try:
with open(prefs_path, "rt") as prefs_file:
prefs = json.load(prefs_file)
except (OSError, ValueError) as exc:
logging.error(f"Failed to load capsule prefs '{prefs_path}': {exc}")
return None
return prefs
def save_capsule_prefs(prefs: dict, prefs_path: Path):
"""Save the capsule preferences. Return True on success."""
try:
with open(prefs_path, "wt") as prefs_file:
json.dump(prefs, prefs_file, indent=2)
except (OSError, ValueError) as exc:
logging.error(f"Failed to save capsule prefs '{prefs_path}': {exc}")
return False
return True
def get_url_render_mode_pref(prefs: dict, url: str) -> Optional[str]:
"""Return the desired render mode for this URL.
If the preferences contain the URL or a parent URL, the corresponding render
mode is used. If several URLs are prefixes of the `url` argument, the
longest one is used to get the matching preference.
Arguments:
- prefs: current capsule preferences.
- url: URL about to be rendered.
"""
prefix_urls = []
for key in prefs:
if url.startswith(key):
prefix_urls.append(key)
if not prefix_urls:
return None
key = max(prefix_urls, key=len)
preference = prefs[key]
return preference.get("render_mode")