mirror of
https://github.com/kmein/niveum
synced 2026-03-16 10:11:08 +01:00
Kierán Meinhardt
e67d6d7df2
Replace all ${pkg}/bin/name patterns with:
- lib.getExe pkg (for main executables: curl, jq, gnused, ffmpeg, etc.)
- lib.getExe' pkg "name" (for specific binaries: coreutils, util-linux, etc.)
32 lines
928 B
Nix
32 lines
928 B
Nix
# Split a PDF into chunks of N pages
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{
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lib,
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writers,
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pdftk,
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gnugrep,
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coreutils,
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}:
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writers.writeDashBin "chunk-pdf" ''
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set -efu
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INPUT_FILE="''${2:?Pass the PDF path as second argument.}"
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PAGES_PER_REPORT="''${1:?Pass the chunk size as first argument.}"
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if [ ! -f "$INPUT_FILE" ]; then
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echo >&2 "File $INPUT_FILE does not exist."
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exit 1
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fi
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TOTAL_PAGES="$(${lib.getExe pdftk} "$INPUT_FILE" dump_data | ${lib.getExe gnugrep} NumberOfPages | ${lib.getExe' coreutils "cut"} -f2 -d' ')"
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RUNS=$((TOTAL_PAGES/PAGES_PER_REPORT))
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for run in $(${lib.getExe' coreutils "seq"} 0 "$((RUNS-1))"); do
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start_page=$((run*PAGES_PER_REPORT+1))
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end_page=$(((run+1)*PAGES_PER_REPORT))
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output_file="chunk_$((run+1)).pdf"
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echo "splitting $INPUT_FILE from $start_page to $end_page into $output_file"
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${lib.getExe pdftk} "$INPUT_FILE" cat "$start_page-$end_page" output "$output_file"
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done
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''
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