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|
#!/usr/bin/env dash
set -eu
mark_read=false
for arg in "$@"; do
case "$arg" in
--mark-read)
mark_read=true
;;
-h | --help)
cat <<'EOF'
usage: arch-news-check [--mark-read]
Check Arch Linux news before a system upgrade. New feed entries are printed
and followed by a "Proceed with upgrade? [Y/n]" prompt. Choosing yes records
the currently visible feed items as seen.
EOF
exit 0
;;
*)
printf 'arch-news-check: unknown option: %s\n' "$arg" >&2
exit 2
;;
esac
done
prompt_proceed() {
if [ ! -t 0 ]; then
printf 'arch-news-check: non-interactive shell; proceeding by default\n' >&2
return 0
fi
while :; do
printf ':: Proceed with upgrade? [Y/n] ' >/dev/tty
IFS= read -r answer </dev/tty || answer=
case "$answer" in
'' | [Yy] | [Yy][Ee][Ss]) return 0 ;;
[Nn] | [Nn][Oo]) return 1 ;;
*) printf 'Please answer yes or no.\n' >/dev/tty ;;
esac
done
}
if ! command -v python3 >/dev/null 2>&1; then
if [ "$mark_read" = true ]; then
printf 'arch-news-check: python3 not found; cannot mark Arch news as read\n' >&2
exit 1
fi
printf 'arch-news-check: python3 not found; skipping Arch news check\n' >&2
prompt_proceed
exit $?
fi
exec python3 - "$@" <<'PY'
from __future__ import annotations
import email.utils
import html
import json
import os
import re
import sys
import textwrap
import urllib.error
import urllib.request
import xml.etree.ElementTree as ET
from pathlib import Path
FEED_URL = os.environ.get("ARCH_NEWS_FEED_URL", "https://archlinux.org/feeds/news/")
STATE_FILE = Path(
os.environ.get(
"ARCH_NEWS_STATE_FILE",
Path(os.environ.get("XDG_STATE_HOME", Path.home() / ".local/state"))
/ "arch-news-check"
/ "seen.json",
)
)
def usage_error(message: str) -> int:
print(f"arch-news-check: {message}", file=sys.stderr)
return 2
def prompt_proceed() -> bool:
if not sys.stdin.isatty():
print("arch-news-check: non-interactive shell; proceeding by default", file=sys.stderr)
return True
while True:
answer = input(":: Proceed with upgrade? [Y/n] ").strip().lower()
if answer in {"", "y", "yes"}:
return True
if answer in {"n", "no"}:
return False
print("Please answer yes or no.")
def fetch_feed() -> bytes:
request = urllib.request.Request(
FEED_URL,
headers={"User-Agent": "arch-news-check/1.0 (+https://archlinux.org/)"},
)
with urllib.request.urlopen(request, timeout=10) as response:
return response.read()
def clean_text(value: str) -> str:
value = html.unescape(value)
value = re.sub(r"<[^>]+>", " ", value)
value = re.sub(r"\s+", " ", value)
return value.strip()
def parse_date(value: str) -> str:
if not value:
return ""
try:
return email.utils.parsedate_to_datetime(value).date().isoformat()
except (TypeError, ValueError):
return value
def parse_feed(raw_xml: bytes) -> list[dict[str, str]]:
root = ET.fromstring(raw_xml)
entries: list[dict[str, str]] = []
for item in root.findall("./channel/item"):
title = clean_text(item.findtext("title", ""))
link = clean_text(item.findtext("link", ""))
guid = clean_text(item.findtext("guid", "")) or link or title
published = parse_date(clean_text(item.findtext("pubDate", "")))
summary = clean_text(item.findtext("description", ""))
if guid:
entries.append(
{
"id": guid,
"title": title or "(untitled)",
"link": link,
"published": published,
"summary": summary,
}
)
return entries
def load_seen() -> set[str]:
try:
data = json.loads(STATE_FILE.read_text())
except FileNotFoundError:
return set()
except (OSError, json.JSONDecodeError):
return set()
seen = data.get("seen", [])
if not isinstance(seen, list):
return set()
return {item for item in seen if isinstance(item, str)}
def save_seen(ids: set[str]) -> None:
STATE_FILE.parent.mkdir(parents=True, exist_ok=True)
tmp = STATE_FILE.with_suffix(".tmp")
tmp.write_text(json.dumps({"seen": sorted(ids)}, indent=2) + "\n")
tmp.replace(STATE_FILE)
def print_news(entries: list[dict[str, str]]) -> None:
print(":: New Arch Linux news")
for entry in entries:
date = f" ({entry['published']})" if entry["published"] else ""
print(f" -> {entry['title']}{date}")
if entry["link"]:
print(f" {entry['link']}")
if entry["summary"]:
summary = textwrap.shorten(entry["summary"], width=500, placeholder=" ...")
print(textwrap.indent(textwrap.fill(summary, width=88), " "))
print()
def main(argv: list[str]) -> int:
mark_read = False
for arg in argv:
if arg == "--mark-read":
mark_read = True
elif arg in {"-h", "--help"}:
return usage_error("help is handled by the shell wrapper")
else:
return usage_error(f"unknown option: {arg}")
try:
entries = parse_feed(fetch_feed())
except (ET.ParseError, OSError, urllib.error.URLError) as exc:
print(f"arch-news-check: failed to read Arch news: {exc}", file=sys.stderr)
return 0 if prompt_proceed() else 1
current_ids = {entry["id"] for entry in entries}
if mark_read:
save_seen(current_ids)
print("Marked current Arch Linux news as read.")
return 0
seen = load_seen()
unread = [entry for entry in entries if entry["id"] not in seen]
if not unread:
return 0
print_news(unread)
if not prompt_proceed():
return 1
save_seen(current_ids)
return 0
if __name__ == "__main__":
raise SystemExit(main(sys.argv[1:]))
PY
|
