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48 lines
1.8 KiB
48 lines
1.8 KiB
#!/usr/bin/env python3
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""" Extract pages from a PDF. """
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import click
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from pikepdf import Pdf
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from asl_rulebook2.utils import parse_page_numbers
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# ---------------------------------------------------------------------
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@click.command()
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@click.argument( "pdf_file", nargs=1, type=click.Path(exists=True,dir_okay=False) )
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@click.option( "--output","-o","output_fname", required=True, type=click.Path(dir_okay=False), help="Output PDF file" )
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@click.option( "--pages","-p", help="Page(s) to dump (e.g. 2,5,9-15)." )
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def main( pdf_file, output_fname, pages ):
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"""Extract pages from a PDF."""
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# NOTE: This extracts pages from the eASLRB, so we can work on specific parts of it without having to load
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# the entire document each time. In particular, it maintains the internal PDF strucuture of each page.
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# The files are not as small as you might expect (e.g. extracting a single page results in a file only
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# about half the size), but processing them is significantly faster.
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# process the command-line arguments
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pages = parse_page_numbers( pages, offset=-1 )
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print( "Loading PDF:", pdf_file )
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with Pdf.open( pdf_file ) as pdf:
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# delete the TOC
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print( "Removing the TOC..." )
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with pdf.open_outline() as outline:
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while outline.root:
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del outline.root[-1]
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# extract the specified pages
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print( "Extracting pages:", ", ".join( str(1+p) for p in sorted(pages) ) )
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for page_no in range( len(pdf.pages)-1, -1, -1 ):
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if page_no not in pages:
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del pdf.pages[ page_no ]
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# save the new PDF
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print( "Saving file:", output_fname )
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pdf.save( output_fname )
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# ---------------------------------------------------------------------
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if __name__ == "__main__":
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main() #pylint: disable=no-value-for-parameter
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