146 lines
5.2 KiB
Python
146 lines
5.2 KiB
Python
import datetime
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import email.utils
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from pathlib import Path
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import re
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from dateutil import parser
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import docutils.frontend
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import docutils.nodes
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import docutils.parsers.rst
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import docutils.utils
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from feedgen import entry
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from feedgen import feed
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# Monkeypatch feedgen.util.formatRFC2822
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def _format_rfc_2822(dt: datetime.datetime) -> str:
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return email.utils.format_datetime(dt, usegmt=True)
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entry.formatRFC2822 = feed.formatRFC2822 = _format_rfc_2822
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line_cache: dict[Path, dict[str, str]] = {}
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def first_line_starting_with(full_path: Path, text: str) -> str:
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# Try and retrieve from cache
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if full_path in line_cache:
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return line_cache[full_path].get(text, "")
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# Else read source
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line_cache[full_path] = path_cache = {}
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for line in full_path.open(encoding="utf-8"):
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if line.startswith("Created:"):
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path_cache["Created:"] = line.removeprefix("Created:").strip()
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elif line.startswith("Title:"):
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path_cache["Title:"] = line.removeprefix("Title:").strip()
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elif line.startswith("Author:"):
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path_cache["Author:"] = line.removeprefix("Author:").strip()
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# Once all have been found, exit loop
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if path_cache.keys == {"Created:", "Title:", "Author:"}:
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break
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return path_cache.get(text, "")
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def pep_creation(full_path: Path) -> datetime.datetime:
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created_str = first_line_starting_with(full_path, "Created:")
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# bleh, I was hoping to avoid re but some PEPs editorialize on the Created line
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# (note as of Aug 2020 only PEP 102 has additional content on the Created line)
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m = re.search(r"(\d+[- ][\w\d]+[- ]\d{2,4})", created_str)
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if not m:
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# some older ones have an empty line, that's okay, if it's old we ipso facto don't care about it.
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# "return None" would make the most sense but datetime objects refuse to compare with that. :-|
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return datetime.datetime(1900, 1, 1)
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created_str = m.group(1)
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try:
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return parser.parse(created_str, dayfirst=True)
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except (ValueError, OverflowError):
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return datetime.datetime(1900, 1, 1)
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def parse_rst(text: str) -> docutils.nodes.document:
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rst_parser = docutils.parsers.rst.Parser()
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components = (docutils.parsers.rst.Parser,)
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settings = docutils.frontend.OptionParser(components=components).get_default_values()
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document = docutils.utils.new_document('<rst-doc>', settings=settings)
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rst_parser.parse(text, document)
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return document
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def pep_abstract(full_path: Path) -> str:
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"""Return the first paragraph of the PEP abstract"""
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text = full_path.read_text(encoding="utf-8")
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for node in parse_rst(text):
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if "<title>Abstract</title>" in str(node):
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for child in node:
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if child.tagname == "paragraph":
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return child.astext().strip().replace("\n", " ")
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return ""
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def main():
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# get the directory with the PEP sources
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pep_dir = Path(__file__).parent
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# get list of peps with creation time (from "Created:" string in pep source)
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peps_with_dt = sorted((pep_creation(path), path) for path in pep_dir.glob("pep-????.*"))
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# generate rss items for 10 most recent peps
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items = []
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for dt, full_path in peps_with_dt[-10:]:
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try:
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pep_num = int(full_path.stem.split("-")[-1])
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except ValueError:
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continue
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title = first_line_starting_with(full_path, "Title:")
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author = first_line_starting_with(full_path, "Author:")
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if "@" in author or " at " in author:
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parsed_authors = email.utils.getaddresses([author])
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# ideal would be to pass as a list of dicts with names and emails to
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# item.author, but FeedGen's RSS <author/> output doesn't pass W3C
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# validation (as of 12/06/2021)
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joined_authors = ", ".join(f"{name} ({email_address})" for name, email_address in parsed_authors)
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else:
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joined_authors = author
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url = f"https://www.python.org/dev/peps/pep-{pep_num:0>4}"
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item = entry.FeedEntry()
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item.title(f"PEP {pep_num}: {title}")
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item.link(href=url)
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item.description(pep_abstract(full_path))
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item.guid(url, permalink=True)
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item.published(dt.replace(tzinfo=datetime.timezone.utc)) # ensure datetime has a timezone
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item.author(email=joined_authors)
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items.append(item)
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# The rss envelope
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desc = """
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Newest Python Enhancement Proposals (PEPs) - Information on new
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language features, and some meta-information like release
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procedure and schedules.
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""".replace("\n ", " ").strip()
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# Setup feed generator
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fg = feed.FeedGenerator()
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fg.language("en")
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fg.generator("")
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fg.docs("https://cyber.harvard.edu/rss/rss.html")
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# Add metadata
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fg.title("Newest Python PEPs")
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fg.link(href="https://www.python.org/dev/peps")
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fg.link(href="https://www.python.org/dev/peps/peps.rss", rel="self")
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fg.description(desc)
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fg.lastBuildDate(datetime.datetime.utcnow().replace(tzinfo=datetime.timezone.utc))
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# Add PEP information (ordered by newest first)
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for item in items:
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fg.add_entry(item)
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pep_dir.joinpath("peps.rss").write_bytes(fg.rss_str(pretty=True))
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if __name__ == "__main__":
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main()
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