dfc94f33d5
Relocate convert_to_scanned.sh from tests/fixtures/scanned/ to tools/ with comprehensive documentation header. Delete incomplete regenerate.sh stub from tests/fixtures/grep-corpus/. Create tools/README.md cataloging all 18 generators with usage examples. Changes: - Move: tests/fixtures/scanned/convert_to_scanned.sh → tools/convert_pdf_to_scanned.sh - Delete: tests/fixtures/grep-corpus/regenerate.sh (incomplete stub) - Create: tools/README.md (comprehensive generator catalog) - Enhance: convert_pdf_to_scanned.sh with detailed documentation Closes bf-2yhak
106 lines
3 KiB
Bash
Executable file
106 lines
3 KiB
Bash
Executable file
#!/usr/bin/env bash
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#
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# convert_pdf_to_scanned.sh - Convert text-embedded PDFs to scanned image-based PDFs
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#
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# Description:
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# Converts text-embedded PDFs to scanned image-based PDFs at 300 DPI.
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# This creates proper OCR test fixtures from text-embedded source PDFs.
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#
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# Usage:
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# ./tools/convert_pdf_to_scanned.sh
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#
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# Requirements:
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# - pdftoppm (poppler-utils): For PDF to PPM conversion
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# - ImageMagick: For PPM to PDF conversion
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# - nix-shell: For dependency management (or install ImageMagick directly)
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#
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# Fixtures Generated:
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# - invoice/invoice-300dpi.pdf (and backup invoice-300dpi-text-embedded.pdf)
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# - letter/letter-300dpi.pdf (and backup letter-300dpi-text-embedded.pdf)
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# - form/form-300dpi.pdf (and backup form-300dpi-text-embedded.pdf)
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#
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# Process:
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# 1. Backs up original text-embedded versions with -text-embedded.pdf suffix
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# 2. Converts PDF to PPM images at specified DPI using pdftoppm
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# 3. Converts PPM images back to PDF using ImageMagick
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# 4. Cleans up temporary files
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#
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# Notes:
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# - Default DPI is 300 (configurable)
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# - Original text-embedded versions are preserved as backups
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# - Uses nix-shell for reproducible ImageMagick environment
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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convert_to_scanned() {
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local input_pdf="$1"
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local output_pdf="$2"
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local dpi="${3:-300}"
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echo "Converting $input_pdf to scanned PDF at ${dpi} DPI..."
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# Create temporary directory for images
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local tmpdir
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tmpdir="$(mktemp -d)"
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# Convert PDF to PPM images at specified DPI
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pdftoppm -r "$dpi" "$input_pdf" "$tmpdir/page"
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# Check if images were created
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if ! ls "$tmpdir"/page-*.ppm 1>/dev/null 2>&1; then
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echo "Error: No images generated from $input_pdf"
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rm -rf "$tmpdir"
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return 1
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fi
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# Convert images back to PDF using ImageMagick via nix-shell
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nix-shell -p imagemagick --run "convert $tmpdir/page-*.ppm \"$output_pdf\""
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# Cleanup temporary directory
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rm -rf "$tmpdir"
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echo "Created: $output_pdf"
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}
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# Main processing
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main() {
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local fixtures=(
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"invoice/invoice-300dpi.pdf"
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"letter/letter-300dpi.pdf"
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"form/form-300dpi.pdf"
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)
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cd "$SCRIPT_DIR"
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for fixture in "${fixtures[@]}"; do
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local input="$fixture"
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local backup="${fixture%.pdf}-text-embedded.pdf"
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local output="$fixture"
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# Skip if this is already a backup file
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if [[ "$input" == *"-text-embedded.pdf" ]]; then
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continue
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fi
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# Only process if the input exists
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if [ -f "$input" ]; then
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# Backup the original text-embedded version
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cp "$input" "$backup"
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echo "Backed up $input to $backup"
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# Convert to scanned version
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convert_to_scanned "$backup" "$output" 300
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else
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echo "Warning: $input not found, skipping"
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fi
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done
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echo ""
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echo "Conversion complete!"
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echo "Original text-embedded versions backed up as *-text-embedded.pdf"
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}
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# Run main function
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main "$@"
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