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#!/usr/bin/env python3
from datetime import datetime
import json
import re
from sys import argv
from urllib.parse import urljoin
from lxml.builder import E
from lxml.etree import CDATA, XML, indent, tostring
from helpers import (
DATE_FORMATTERS,
guess_language,
read_concerts,
tmplocale,
touchup_plaintext,
)
def zoned_datetime(dt):
# Assume that whoever wrote the naive timestamp that this datetime
# was generated from had the same local time we do.
# Note: even if we assume that all timestamps in concerts.in and
# concerts-pubdates.json come from the same "zone" (Europe/Paris),
# the *time offset* can differ (CET vs CEST), so we can't just
# define a global TIMEZONE = datetime.now().tzinfo and slap that
# on every datetime.
return dt.replace(tzinfo=dt.astimezone().tzinfo)
NOW = zoned_datetime(datetime.now())
DATE_FORMAT = '%-d %b %Y %H:%M %z'
LOCALIZED_TEXT = {
'en': {
'title': 'Bellefeuille Quartet',
'indexpath': 'en/',
'description': 'News from the Bellefeuille quartet',
},
'fr': {
'title': 'Quatuor Bellefeuille',
'indexpath': '/',
'description': 'Des nouvelles du quatuor Bellefeuille',
},
}
LOCALIZED_FORMATS = {
'en': {
'title': lambda c: f'{c.time.strftime("%B %-d %Y")} in {c.place}',
},
'fr': {
'title': lambda c: f'{c.time.strftime("%-d %B %Y")} à {c.place}',
},
}
def join(sequence, joiner_factory):
# There's got to be a standard itertools/functools thingy to do that…
result = []
for i, item in enumerate(sequence, start=1):
result.append(item)
if i == len(sequence):
break
result.append(joiner_factory())
return result
def cdata_concert(concert, lang):
formatters = DATE_FORMATTERS[lang]
blocks = []
if concert.warning is not None:
blocks.append(E.p(concert.warning))
with tmplocale(lang):
blocks.extend((
E.p(formatters['date'](concert.time)),
E.p(formatters['time'](concert.time)),
))
pieces = touchup_plaintext(concert.pieces)
instructions = touchup_plaintext(concert.instructions)
blocks.extend((
E.p(*join(concert.address.splitlines(), E.br)),
E.ol(
*(XML(f'<li>{line}</li>') for line in pieces.splitlines())
),
*(XML(f'<p>{line}</p>') for line in instructions.splitlines() if line),
))
# Do a silly dance to indent CDATA correctly.
for b in blocks:
indent(b)
html_blocks = (tostring(b, encoding='utf-8').decode() for b in blocks)
cdata = '\n'.join(html_blocks) + '\n'
cdata = re.sub('^', 8*' ', cdata, flags=re.MULTILINE)
return CDATA('\n' + cdata)
def generate_concert(concert, concerts_url, pubdates, lang):
formatters = LOCALIZED_FORMATS[lang]
with tmplocale(lang):
title = formatters['title'](concert)
anchor = f'concert-{concert.time.strftime("%F")}'
item = E.item(
E.title(title),
E.link(f'{concerts_url}#{anchor}'),
E.description(cdata_concert(concert, lang)),
)
pubdate_str = pubdates[concert.time.isoformat(timespec='minutes')]
if pubdate_str is not None:
pubdate = zoned_datetime(datetime.fromisoformat(pubdate_str))
item.append(E.pubDate(pubdate.strftime(DATE_FORMAT)))
return item
def generate_concerts(concerts_src, concerts_url, concerts_pubdates, lang):
with open(concerts_pubdates) as pubdates_file:
pubdates = json.load(pubdates_file)
return tuple(
generate_concert(c, concerts_url, pubdates, lang)
for c in read_concerts(concerts_src)
)
def main(concerts_src, feed_dst, concerts_pubdates, domain):
lang = guess_language(concerts_src)
text = LOCALIZED_TEXT[lang]
url = f'https://{domain}'
index_url = urljoin(url, text['indexpath'])
concerts_url = urljoin(index_url, 'concerts.html')
now_formatted = NOW.strftime(DATE_FORMAT)
concerts = generate_concerts(
concerts_src, concerts_url, concerts_pubdates, lang
)
rss = E.rss(
E.channel(
E.title(text['title']),
E.link(index_url),
E.description(text['description']),
E.image(
E.url(urljoin(url, 'images/logo.svg')),
E.link(concerts_url),
),
E.lastBuildDate(now_formatted),
E.pubDate(now_formatted),
E.language(lang),
*concerts,
),
version='2.0',
)
indent(rss)
with open(feed_dst, 'wb') as feed:
feed.write(tostring(rss, encoding='utf-8', xml_declaration=True))
if __name__ == '__main__':
main(*argv[1:])
|
