fancier options for PDF strategy
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@ -382,7 +382,7 @@ class Collator:
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def link_pdf(self, src):
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with fitz.open(src) as pdf:
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images = pdf_images(pdf, self.args.force_convert_pdf)
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images = pdf_images(pdf, self.args.pdf_strategy)
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if images is None:
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print(f'Failed to enumerate page images in PDF, skipping {src}')
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return None
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@ -569,7 +569,7 @@ def display_sixel_page(page):
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finally:
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sixel_output_unref(output)
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def pdf_images(pdf, force=False):
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def pdf_images(pdf, strategy):
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images_by_page = [(page.get_images(), is_single_image(page)) for page in pdf]
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if all(len(images) == 1 and single for (images, single) in images_by_page):
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return (extract_image(pdf, images[0][0]) for (images, _) in images_by_page)
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@ -587,24 +587,29 @@ def pdf_images(pdf, force=False):
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image_extractors.append(lambda p=pdf, x=xref: extract_image(p, x))
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else:
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print(f'\nPage {idx+1}: {len(page_images)} images, {len([img for img in page_images if img["xref"] == 0])} non-xref images, {len(relevant_blocks(page))} total relevant objects')
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if force:
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print(f'Converting page {idx+1}')
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choice = 'c'
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else:
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shown = False
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while True:
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choice = input(f'[N]ope out of this PDF / [c]onvert page to image{"" if xref is None else " / e[x]tract embedded image without text"}{"" if shown else " / [s]how page before deciding"}? [N/c{"" if xref is None else "/x"}{"" if shown else "/s"}] ')
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if not shown and choice != '' and choice[0].lower() == 's':
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display_sixel_page(page)
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shown = True
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else:
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break
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if xref is not None and choice != '' and choice[0].lower() == 'x':
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image_extractors.append(lambda p=pdf, x=xref: extract_image(p, x))
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elif choice != '' and choice[0].lower() == 'c':
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image_extractors.append(lambda p=page: { 'ext': 'png', 'image': p.get_pixmap(dpi=PDF_CONVERSION_DPI).tobytes('png') })
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else:
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return None
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choice = strategy
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while True:
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if choice.lower().startswith('n'):
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return None
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if choice.lower().startswith('c'):
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if choice == strategy:
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print(f'Converting page {idx+1}')
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image_extractors.append(lambda p=page: { 'ext': 'png', 'image': p.get_pixmap(dpi=PDF_CONVERSION_DPI).tobytes('png') })
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break
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if xref is not None and (choice.lower().startswith('x') or choice.lower() == 'extract'):
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if choice == strategy:
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print(f'Extracting image from page {idx+1} without text')
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image_extractors.append(lambda p=pdf, x=xref: extract_image(p, x))
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break
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if choice.lower().startswith('d'):
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if choice == strategy:
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print(f'Dropping page {idx+1}')
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break
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if choice.lower().startswith('s'):
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display_sixel_page(page)
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choice = input(f'[N]ope out / [c]onvert page{"" if xref is None else " / e[x]tract image"} / [d]rop page / [s]how page? [n/c{"" if xref is None else "/x"}/d/s] ')
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print(f'\x1b[2K\r{idx+1}/{pdf.page_count} pages processed...', end=('' if idx+1 < pdf.page_count else '\n'))
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return (extractor() for extractor in image_extractors)
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@ -1182,9 +1187,17 @@ parser_collate.add_argument(
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help="only collate works that are explicitly specified",
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)
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parser_collate.add_argument(
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'--force-convert-pdf',
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action='store_true',
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help="convert a PDF page to a 300dpi image if there isn't a single image we can extract directly",
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'-p', '--pdf-strategy',
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choices=[
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'ask', '?',
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'show-ask', 's',
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'convert', 'c',
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'extract', 'x',
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'drop', 'd',
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'nope', 'n'
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],
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default='show-ask',
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help="how to handle PDF pages that aren't a single image with no text",
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)
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parser_collate.add_argument(
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'expression',
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