83 lines
2.1 KiB
Bash
Executable File
83 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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# Reorganize PDF for book-alike printing
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# -- w/o cover i.e. page 1 is the cover page --
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#
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# Author: Nils Freydank <holgersson@posteo.de>
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# Copyright: 2020 by Nils Freydank
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# License: MIT
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# Version: 2020-11-11
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#
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# dependencies:
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# - bash
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# - coreutils (date, mkdir)
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# - groff (for empty page generation)
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# - poppler (pdfseperate, pdfunite)
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PATH="/bin:/usr/bin"
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INPUT_FILE="${1:-input.pdf}"
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OUTPUT_FILE="${2:-printable_output.pdf}"
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TMPDIR="tmp_$(date --utc +%s)"
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mkdir -p "${TMPDIR}"
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# Separate the document into single pages.
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pdfseparate "${INPUT_FILE}" "${TMPDIR}/%d.pdf"
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# Rearrange the pages:
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# 1. Find out the highest page number.
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# 2. If page number can't be devided by 4 (i.e. modulus operation is not zero),
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# then align/fill with empty pages until it can.
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# 3. Create an array with old -> new mappings.
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# 4. Move the pages.
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# -- step 1 of 4 --
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PAGE_COUNTER="$(ls "${TMPDIR}" | wc -l)"
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# -- step 2 of 4 --
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while [[ $((${PAGE_COUNTER} % 4)) != 0 ]]
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do
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# Create an new empty page.
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echo "" | groff -T pdf > ${TMPDIR}/$((${PAGE_COUNTER} + 1)).pdf
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# Re-scan the files.
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PAGE_COUNTER="$(ls "${TMPDIR}" | wc -l)"
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done
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# -- step 3 of 4 --
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NEW_PAGE_LIST=()
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ctr_down="${PAGE_COUNTER}"
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# Note: Start at 1 as this is our first page.
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ctr_up=1
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while [[ ${ctr_up} -le $((${PAGE_COUNTER} / 2 )) ]]
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do
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NEW_PAGE_LIST+=( ${ctr_down} )
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NEW_PAGE_LIST+=( ${ctr_up} )
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ctr_down=$((${ctr_down} - 1))
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ctr_up=$((${ctr_up} + 1))
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NEW_PAGE_LIST+=( ${ctr_up} )
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NEW_PAGE_LIST+=( ${ctr_down} )
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ctr_down=$((${ctr_down} - 1))
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ctr_up=$((${ctr_up} + 1))
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done
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# -- step 4 of 4 --
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# Warning: Remember to start at zero as an array is accessed!
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for ((i=0; i < ${#NEW_PAGE_LIST[*]}; i++))
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do
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if [[ $((i + 1)) -le 9 ]]
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then
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mv "${TMPDIR}/${NEW_PAGE_LIST[$i]}.pdf" "${TMPDIR}/newpage-0$((i + 1)).pdf"
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else
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mv "${TMPDIR}/${NEW_PAGE_LIST[$i]}.pdf" "${TMPDIR}/newpage-$((i + 1)).pdf"
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fi
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done
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# Re-unite the sorted pages for printing.
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pdfunite "${TMPDIR}"/newpage-* "${OUTPUT_FILE}"
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# Cleanup intermediate data.
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rm -rf "${TMPDIR}"
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# vim:fileencoding=utf-8:ts=4:syntax=bash:colorcolumn=81:noexpandtab
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