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"""
Demo script for PyMuPDF's `pymupdf.Story.write_stabilized()`.
`pymupdf.Story.write_stabilized()` is similar to `pymupdf.Story.write()`,
except instead of taking a fixed html document, it does iterative layout
of dynamically-generated html content (provided by a callback) to a
`pymupdf.DocumentWriter`.
For example this allows one to add a dynamically-generated table of contents
section while ensuring that page numbers are patched up until stable.
"""
import textwrap
import pymupdf
def rectfn(rect_num, filled):
'''
We return one rect per page.
'''
rect = pymupdf.Rect(10, 20, 290, 380)
mediabox = pymupdf.Rect(0, 0, 300, 400)
#print(f'rectfn(): rect_num={rect_num} filled={filled}')
return mediabox, rect, None
def contentfn(positions):
'''
Returns html content, with a table of contents derived from `positions`.
'''
ret = ''
ret += textwrap.dedent('''
<!DOCTYPE html>
<body>
<h2>Contents</h2>
<ul>
''')
# Create table of contents with links to all <h1..6> sections in the
# document.
for position in positions:
if position.heading and (position.open_close & 1):
text = position.text if position.text else ''
if position.id:
ret += f" <li><a href=\"#{position.id}\">{text}</a>\n"
else:
ret += f" <li>{text}\n"
ret += f" <ul>\n"
ret += f" <li>page={position.page_num}\n"
ret += f" <li>depth={position.depth}\n"
ret += f" <li>heading={position.heading}\n"
ret += f" <li>id={position.id!r}\n"
ret += f" <li>href={position.href!r}\n"
ret += f" <li>rect={position.rect}\n"
ret += f" <li>text={text!r}\n"
ret += f" <li>open_close={position.open_close}\n"
ret += f" </ul>\n"
ret += '</ul>\n'
# Main content.
ret += textwrap.dedent(f'''
<h1>First section</h1>
<p>Contents of first section.
<h1>Second section</h1>
<p>Contents of second section.
<h2>Second section first subsection</h2>
<p>Contents of second section first subsection.
<h1>Third section</h1>
<p>Contents of third section.
</body>
''')
ret = ret.strip()
with open(__file__.replace('.py', '.html'), 'w') as f:
f.write(ret)
return ret;
out_path = __file__.replace('.py', '.pdf')
writer = pymupdf.DocumentWriter(out_path)
pymupdf.Story.write_stabilized(writer, contentfn, rectfn)
writer.close()
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