55 lines
1.7 KiB
Python
55 lines
1.7 KiB
Python
"""Markdown (.md / .markdown) -> PDF.
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Rendered with the `markdown` library (tables, fenced code, nl2br) and
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typeset by WeasyPrint with app.BASE_CSS injected at the top of <head> so
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the fallback layer sits under any user CSS. The first ATX H1 becomes the
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export name and PDF /Title (it stays in the rendered document for visual
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fidelity); without an H1 the file stem is used.
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Empty input renders 0 pages and fails in finalize with
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"no renderable content: ..." — unpinned, acceptable.
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"""
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from __future__ import annotations
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import re
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from pathlib import Path
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from . import common
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_FIRST_H1_RE = re.compile(r"^\s*#\s+(.+?)\s*#*\s*$", re.MULTILINE)
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def _extract_h1(md_text: str) -> str | None:
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m = _FIRST_H1_RE.search(md_text)
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if not m:
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return None
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title = re.sub(r"[#*`_]", "", m.group(1))
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title = " ".join(title.split())
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return title or None
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def convert(path: Path, job_id: str, progress_cb=None, output_dir=None,
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source_name=None) -> str:
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"""Render a Markdown file to a typeset PDF."""
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import app # lazy: BASE_CSS lives with the EPUB pipeline
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import markdown
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text = common.decode_text(path.read_bytes())
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title = _extract_h1(text)
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body_html = markdown.markdown(
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text, extensions=["tables", "fenced_code", "nl2br"]
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)
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html_doc = (
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f"<!DOCTYPE html><html><head><style>\n{app.BASE_CSS}\n</style>"
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f"</head><body>{body_html}</body></html>"
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)
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def _build():
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return html_doc, path.name
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return common.convert_single(
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path, job_id, build_html=_build, title=title, css="",
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progress_cb=progress_cb, output_dir=output_dir,
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name_src=source_name or path.name,
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)
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