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#!/usr/bin/env bash
declare -r ARG="$1"
# From my NextCloud sync folder :-)
declare -r JOURNAL_DIR="$HOME/Journals/"
# Storing extract back to the NextCloud sync folder so that I can also read it
# from my smartphone! :-)
declare -r OUT_PDF=$JOURNAL_DIR/random_journal_extract.pdf
declare -i NUM_PAGES_TO_EXTRACT=42 # This is the answear!
declare -r PDF_VIEWER_COMMAND=/usr/bin/evince
get_random_journal () {
find "$1" -name \*.pdf | grep -v random_journal_extract | sort -R | head -n 1
}
extract () {
local -r in_pdf="$1"; shift
local -i from="$1"; shift
local -i to="$1"; shift
local -r out_pdf="$1"; shift
echo "Extracting pages ${from}-${to} from $in_pdf to $out_pdf"
qpdf --empty --pages "$in_pdf" "${from}-${to}" -- "$out_pdf"
chmod 600 "$out_pdf"
}
main () {
local -r random_journal=$(get_random_journal "$JOURNAL_DIR")
local -i num_pages=$(pdfinfo "$random_journal" | awk '/Pages/ { print $2 }')
local -i extract_from=$(( 1 + (RANDOM % num_pages) - NUM_PAGES_TO_EXTRACT ))
if [ $extract_from -lt 1 ]; then
extract_from=1
fi
local -i extract_to=$(( extract_from + NUM_PAGES_TO_EXTRACT -1 ))
if [ $extract_to -gt "$num_pages" ]; then
extract_to=$num_pages
fi
extract "$random_journal" "$extract_from" "$extract_to" "$OUT_PDF"
if [ "$ARG" != cron ]; then
$PDF_VIEWER_COMMAND "$OUT_PDF"
fi
}
main
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