feat: add md_to_pdf.py Markdown-to-PDF conversion utility

composite-envelope-builder/scripts/md_to_pdf.py

@@ -0,0 +1,192 @@
+#!/usr/bin/env python3
+import sys
+from pathlib import Path
+import textwrap
+import re
+
+try:
+    from reportlab.lib.pagesizes import letter
+    from reportlab.pdfgen import canvas
+    from reportlab.lib.units import inch
+    from reportlab.lib import colors
+except Exception as e:
+    print('Missing reportlab:', e)
+    sys.exit(2)
+
+
+def wrap_text(text, max_chars):
+    return textwrap.wrap(text, width=max_chars)
+
+
+def draw_wrapped(c, text, x, y, font_name, font_size, max_width, indent=0):
+    # Estimate chars per line roughly
+    approx_char_width = font_size * 0.55
+    max_chars = max(20, int((max_width - indent) / approx_char_width))
+    wrapped = wrap_text(text, max_chars)
+    line_height = font_size * 1.25
+    for line in wrapped:
+        c.drawString(x + indent, y, line)
+        y -= line_height
+    return y
+#!/usr/bin/env python3
+import sys
+from pathlib import Path
+import textwrap
+
+try:
+    from reportlab.lib.pagesizes import letter
+    from reportlab.pdfgen import canvas
+    from reportlab.lib.units import inch
+    from reportlab.lib import colors
+except Exception as e:
+    print('Missing reportlab:', e)
+    sys.exit(2)
+
+
+def wrap_text(text, max_chars):
+    return textwrap.wrap(text, width=max_chars)
+
+
+def draw_wrapped(c, text, x, y, font_name, font_size, max_width, indent=0):
+    # Estimate chars per line roughly
+    approx_char_width = font_size * 0.55
+    max_chars = max(20, int((max_width - indent) / approx_char_width))
+    wrapped = wrap_text(text, max_chars)
+    line_height = font_size * 1.25
+    for line in wrapped:
+        c.drawString(x + indent, y, line)
+        y -= line_height
+    return y
+
+
+if len(sys.argv) < 3:
+    print('Usage: md_to_pdf.py input.md output.pdf')
+    sys.exit(1)
+
+in_path = Path(sys.argv[1])
+out_path = Path(sys.argv[2])
+
+if not in_path.exists():
+    print('Input file not found:', in_path)
+    sys.exit(1)
+
+text = in_path.read_text(encoding='utf-8')
+lines = text.splitlines()
+
+c = canvas.Canvas(str(out_path), pagesize=letter)
+width, height = letter
+left = inch * 0.75
+right = inch * 0.75
+top = height - inch * 0.75
+bottom = inch * 0.75
+max_width = width - left - right
+
+# default fonts
+REGULAR = 'Helvetica'
+BOLD = 'Helvetica-Bold'
+MONO = 'Courier'
+
+y = top
+
+in_code = False
+code_font_size = 8
+para_font_size = 10
+
+for raw in lines:
+    line = raw.rstrip('\n')
+    if line.strip() == '':
+        y -= para_font_size * 0.6
+        if y < bottom:
+            c.showPage()
+            y = top
+        continue
+
+    # Code fence toggle
+    if line.strip().startswith('```'):
+        in_code = not in_code
+        if in_code:
+            y -= 6
+        else:
+            y -= 6
+        if y < bottom:
+            c.showPage()
+            y = top
+        continue
+
+    if in_code:
+        c.setFont(MONO, code_font_size)
+        # draw code line with small left indent
+        y = draw_wrapped(c, line, left, y, MONO, code_font_size, max_width, indent=10)
+        c.setFont(REGULAR, para_font_size)
+        if y < bottom:
+            c.showPage()
+            y = top
+        continue
+
+    # Headings
+    if line.lstrip().startswith('#'):
+        hashes, _, rest = line.partition(' ')
+        level = hashes.count('#')
+        text = rest.strip()
+        # add extra space BEFORE top-level headings so they don't butt against previous paragraph
+        if level == 1:
+            y -= para_font_size * 1.8
+        elif level == 2:
+            y -= para_font_size * 0.8
+        else:
+            y -= para_font_size * 0.6
+
+        if level == 1:
+            font_size = 18
+            font = BOLD
+        elif level == 2:
+            font_size = 14
+            font = BOLD
+        else:
+            font_size = 12
+            font = BOLD
+        c.setFont(font, font_size)
+        y = draw_wrapped(c, text, left, y, font, font_size, max_width)
+        # modest spacing after headings
+        y -= para_font_size * 0.6
+        c.setFont(REGULAR, para_font_size)
+        if y < bottom:
+            c.showPage()
+            y = top
+        continue
+
+    # Horizontal rule
+    if line.strip() in ('---', '***', '___'):
+        c.setStrokeColor(colors.black)
+        c.setLineWidth(1)
+        y -= 6
+        c.line(left, y, left + max_width, y)
+        y -= 12
+        if y < bottom:
+            c.showPage()
+            y = top
+        continue
+
+    # Lists
+    stripped = line.lstrip()
+    if stripped.startswith(('- ', '* ', '+ ')) or stripped[:2].isdigit() and stripped[2:].startswith('. '):
+        bullet = '•'
+        content = stripped[2:].strip() if not stripped[0].isdigit() else stripped.split('.', 1)[1].strip()
+        c.setFont(REGULAR, para_font_size)
+        # draw bullet and wrapped content with indent
+        c.drawString(left, y, bullet)
+        y = draw_wrapped(c, content, left + 12, y, REGULAR, para_font_size, max_width, indent=0)
+        if y < bottom:
+            c.showPage()
+            y = top
+        continue
+
+    # Paragraph
+    c.setFont(REGULAR, para_font_size)
+    y = draw_wrapped(c, line, left, y, REGULAR, para_font_size, max_width)
+    if y < bottom:
+        c.showPage()
+        y = top
+
+c.save()
+print('Wrote PDF:', out_path)