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#!/usr/bin/env python3
"""
Generate a PDF listing for an HP-41C program with line numbers and a header.
Requires: reportlab (pip install reportlab)
"""
from __future__ import annotations
import argparse
import os
import sys
from datetime import datetime
import re
def require_reportlab():
try:
from reportlab.lib.pagesizes import A4 # noqa: F401
from reportlab.lib.units import mm # noqa: F401
from reportlab.pdfgen import canvas # noqa: F401
except Exception as exc: # pragma: no cover
print("Error: reportlab is required. Install via: pip install reportlab", file=sys.stderr)
raise SystemExit(2) from exc
def iter_wrapped_lines(text: str, max_width: float, font_name: str, font_size: int):
from reportlab.pdfbase import pdfmetrics
if not text:
return [""]
words = text.split(" ")
lines = []
current = ""
for word in words:
candidate = word if not current else f"{current} {word}"
width = pdfmetrics.stringWidth(candidate, font_name, font_size)
if width <= max_width:
current = candidate
else:
if current:
lines.append(current)
current = word
if current:
lines.append(current)
return lines
def generate_pdf(lines: list[str], output_path: str, program_name: str):
from reportlab.lib.pagesizes import A4
from reportlab.lib.units import mm
from reportlab.pdfgen import canvas
from reportlab.pdfbase import pdfmetrics
page_width, page_height = A4
margin_left = 18 * mm
margin_right = 18 * mm
margin_top = 18 * mm
margin_bottom = 18 * mm
header_font = "Helvetica-Bold"
body_font = "Courier"
header_size = 14
body_size = 10
line_height = 1.35 * body_size
content_width = page_width - margin_left - margin_right
usable_height = page_height - margin_top - margin_bottom - (header_size + 6)
lines_per_page = int(usable_height // line_height)
if lines_per_page <= 0:
raise ValueError("Page layout too tight. Increase margins or reduce font size.")
c = canvas.Canvas(output_path, pagesize=A4)
c.setAuthor("hp41_program_to_pdf.py")
c.setTitle(program_name)
timestamp = datetime.now().strftime("%Y-%m-%d %H:%M")
total_lines = len(lines)
line_number = 1
page_number = 1
def draw_header():
c.setFont(header_font, header_size)
c.drawString(margin_left, page_height - margin_top, program_name)
c.setFont("Helvetica", 8)
c.drawRightString(page_width - margin_right, page_height - margin_top + 2, timestamp)
c.drawRightString(page_width - margin_right, page_height - margin_top - 10, f"Page {page_number}")
c.line(margin_left, page_height - margin_top - 14, page_width - margin_right, page_height - margin_top - 14)
y_start = page_height - margin_top - 24
y = y_start
draw_header()
c.setFont(body_font, body_size)
# Pre-parse line numbers when present; keep blank/comment lines but don't
# count them for numbering.
parsed_lines: list[tuple[int | None, str]] = []
auto_line_no = 1
number_re = re.compile(r"^\s*(\d+)[\s:]+(.*)$")
for original in lines:
stripped = original.strip()
if stripped == "" or stripped.startswith("#"):
parsed_lines.append((None, original))
continue
match = number_re.match(original)
if match:
num = int(match.group(1))
text = match.group(2).rstrip()
parsed_lines.append((num, text))
auto_line_no = num + 1
else:
parsed_lines.append((auto_line_no, original))
auto_line_no += 1
numbered = [n for n, _ in parsed_lines if n is not None]
if numbered:
max_digits = max(len(str(n)) for n in numbered)
else:
max_digits = 1
line_no_format = f"{{:0{max_digits}d}}"
line_no_width = pdfmetrics.stringWidth("0" * max_digits, body_font, body_size) + 6
content_width = page_width - margin_left - margin_right - line_no_width
for line_number, original in parsed_lines:
wrapped = iter_wrapped_lines(original, content_width, body_font, body_size)
for i, wline in enumerate(wrapped):
if y < margin_bottom + line_height:
c.showPage()
page_number += 1
draw_header()
c.setFont(body_font, body_size)
y = y_start
if i == 0 and line_number is not None:
c.drawString(margin_left, y, line_no_format.format(line_number))
c.drawString(margin_left + line_no_width, y, wline)
y -= line_height
c.save()
if total_lines == 0:
print("Warning: input file had no lines.", file=sys.stderr)
def main() -> int:
require_reportlab()
parser = argparse.ArgumentParser(
description="Generate a PDF listing for an HP-41C program."
)
parser.add_argument("input", help="Text file with HP-41C program steps, one per line.")
parser.add_argument(
"output",
nargs="?",
help="Output PDF file (default: <input>.pdf).",
)
parser.add_argument(
"--name",
help="Program name to use in the header (default: input filename).",
)
args = parser.parse_args()
input_path = args.input
if not os.path.isfile(input_path):
print(f"Error: input file not found: {input_path}", file=sys.stderr)
return 2
output_path = args.output or f"{input_path}.pdf"
program_name = args.name or os.path.splitext(os.path.basename(input_path))[0]
with open(input_path, "r", encoding="utf-8") as f:
lines = [line.rstrip("\n") for line in f.readlines()]
generate_pdf(lines, output_path, program_name)
print(f"Wrote {output_path}")
return 0
if __name__ == "__main__":
raise SystemExit(main())
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