56 lines
1.9 KiB
Python
56 lines
1.9 KiB
Python
"""Plain text (.txt) and log (.log) -> PDF.
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Decode ladder (no mojibake on legacy files, never raises):
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1. strict UTF-8 -> valid UTF-8 is never second-guessed
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2. strict windows-1252 -> its 5 undefined byte holes (0x81/8D/8F/90/9D)
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make a successful strict decode a reliable
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cp1252 signal (covers latin-1-ish content too)
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3. charset-normalizer -> best guess for other legacy encodings
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4. UTF-8 errors=replace -> last resort, total losslessness guarantee
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Empty / whitespace-only input is a job error ("empty file: ..."). The text
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is wrapped in <pre> with PRE_CSS (monospace, wrapped, A4) so line structure
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and indentation survive the render.
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"""
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from __future__ import annotations
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from pathlib import Path
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from . import common
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def decode_bytes(raw: bytes) -> str:
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"""Best-effort decode ladder; see module docstring."""
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try:
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return raw.decode("utf-8")
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except UnicodeDecodeError:
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pass
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try:
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return raw.decode("cp1252")
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except UnicodeDecodeError:
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pass
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from charset_normalizer import from_bytes
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best = from_bytes(raw).best()
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if best is not None:
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return str(best)
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return raw.decode("utf-8", errors="replace")
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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 plain-text or log file to a monospace PDF."""
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raw = path.read_bytes()
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if not raw.strip():
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raise ValueError("empty file: nothing to convert")
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text = decode_bytes(raw)
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def _build():
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return f"<html><body><pre>{common.escape(text)}</pre></body></html>", path.name
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return common.convert_single(
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path, job_id, build_html=_build, css=common.PRE_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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