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import html.parser
import importlib.resources
import io
import logging
import tempfile
from dataclasses import dataclass
from itertools import chain
from pathlib import Path
import jinja2
import typst
from babel.dates import format_datetime
from babel.numbers import format_decimal
from pyramid.i18n import Localizer
from pyramid.i18n import TranslationString as _
from . import trackmap, util
from .config import TileLayerConfig
from .models import Track
from .models.track import TrackWithMetadata
from .views.tileproxy import TileRequester
LOGGER = logging.getLogger(__name__)
TEMP_PREFIX = "fietsboek-typst-"
IMAGE_WIDTH = 900
IMAGE_HEIGHT = 300
# See https://typst.app/docs/reference/syntax/
TO_ESCAPE = {
"$",
"#",
"[",
"]",
"*",
"_",
"`",
"<",
">",
"@",
"=",
"-",
"+",
"/",
"\\",
}
class HtmlToTypst(html.parser.HTMLParser):
def __init__(self, out):
super().__init__()
self.out = out
def handle_data(self, data):
self.out.write(typst_escape(data))
def handle_starttag(self, tag, attrs):
if tag == "strong":
self.out.write("#strong[")
elif tag == "em":
self.out.write("#emph[")
elif tag == "a":
href = ""
for key, val in attrs:
if key == "href":
href = val
self.out.write(f"#link({typst_string(href)})[")
elif tag == "ul":
self.out.write("#list(")
elif tag == "ol":
self.out.write("#enum(")
elif tag == "li":
self.out.write("[")
elif tag == "h1":
self.out.write("#heading(level: 1)[")
elif tag == "h2":
self.out.write("#heading(level: 2)[")
elif tag == "h3":
self.out.write("#heading(level: 3)[")
elif tag == "h4":
self.out.write("#heading(level: 4)[")
elif tag == "h5":
self.out.write("#heading(level: 5)[")
elif tag == "h6":
self.out.write("#heading(level: 6)[")
def handle_endtag(self, tag):
if tag == "p":
self.out.write("\n\n")
elif tag == "strong":
self.out.write("]")
elif tag == "em":
self.out.write("]")
elif tag == "a":
self.out.write("]")
elif tag == "ul":
self.out.write(")")
elif tag == "ol":
self.out.write(")")
elif tag == "li":
self.out.write("],")
elif tag in {"h1", "h2", "h3", "h4", "h5", "h6"}:
self.out.write("]")
def typst_string(value: str) -> str:
return '"' + "".join(f"\\u{{{ord(char):x}}}" for char in value) + '"'
def typst_escape(value: str) -> str:
return "".join("\\" + char if char in TO_ESCAPE else char for char in value)
def md_to_typst(value: str) -> str:
html = util.safe_markdown(value).unescape()
buffer = io.StringIO()
parser = HtmlToTypst(buffer)
parser.feed(html)
return buffer.getvalue()
def draw_map(track: Track, requester: TileRequester, tile_layer: TileLayerConfig, outfile: Path):
map_image = trackmap.render(
track.path(),
tile_layer,
requester,
size=(IMAGE_WIDTH, IMAGE_HEIGHT),
)
map_image.save(str(outfile))
def generate(
track: Track, requester: TileRequester, tile_layer: TileLayerConfig, localizer: Localizer
) -> bytes:
"""Generate a PDF representation for the given track."""
env = jinja2.Environment(
loader=jinja2.PackageLoader("fietsboek", "pdf-assets"),
autoescape=False,
)
env.filters["typst_escape"] = typst_escape
env.filters["md_to_typst"] = md_to_typst
twm = TrackWithMetadata(track)
template = env.get_template("overview.typ")
translate = localizer.translate
locale = localizer.locale_name
placeholders = {
"title": track.title or track.date.strftime("%Y-%m-%d %H:%M"),
"people": [person.name for person in chain([track.owner], track.tagged_people)],
"table": [
(translate(_("pdf.table.date")), format_datetime(track.date, locale=locale)),
(
translate(_("pdf.table.length")),
"{} km".format(format_decimal(twm.length / 1000, locale=locale)),
),
(
translate(_("pdf.table.uphill")),
"{} m".format(format_decimal(twm.uphill, locale=locale)),
),
(
translate(_("pdf.table.downhill")),
"{} m".format(format_decimal(twm.downhill, locale=locale)),
),
(translate(_("pdf.table.moving_time")), str(twm.moving_time)),
(translate(_("pdf.table.stopped_time")), str(twm.stopped_time)),
(
translate(_("pdf.table.max_speed")),
"{} km/h".format(format_decimal(util.mps_to_kph(twm.max_speed), locale=locale)),
),
(
translate(_("pdf.table.avg_speed")),
"{} km/h".format(format_decimal(util.mps_to_kph(twm.avg_speed), locale=locale)),
),
],
"description": track.description,
}
with tempfile.TemporaryDirectory(prefix=TEMP_PREFIX) as temp_dir:
LOGGER.debug("New PDF generation in %s", temp_dir)
temp_dir = Path(temp_dir)
font_data = importlib.resources.read_binary("fietsboek", "pdf-assets/Nunito.ttf")
(temp_dir / "Nunito.ttf").write_bytes(font_data)
draw_map(track, requester, tile_layer, temp_dir / "mapimage.png")
LOGGER.debug("%s: map drawn", temp_dir)
rendered = template.render(placeholders)
LOGGER.debug("%s: typst template rendered", temp_dir)
(temp_dir / "overview.typ").write_text(rendered)
pdf_bytes = typst.compile(
str(temp_dir / "overview.typ"),
font_paths=[str(temp_dir)],
)
LOGGER.debug("%s: PDF rendering complete", temp_dir)
return pdf_bytes
__all__ = ["generate"]
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