dotfiles/writing/.local/bin/bib-due

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#!/usr/bin/env sh
# shows due entries of bibtex file passed in
# HACK: brittle! will break on various bibfile abnormities (even just on due date w/o priority)
# FIXME: reimplementation with real library needed
#
OPTIND=1 # Reset in case getopts has been used previously in the shell.
fields="due|priority|\bauthor\b|\btitle\b"
filterby="due"
file="${BIBFILE}"
until=""
show_help() {
printf "%s\n" \
"" \
" bib-due Show due readings from bibtex file." \
"" \
" Usage: bib-due [-hv] -i input.bib -r 'due|priority|\bauthor|\btitle' -l 'due' -u '2020-05-12'" \
"" \
" Options:" \
"" \
" -i [bibtex-file] Input bibtex file to scrape and get items from." \
"" \
" -r [fields] Field values to read in file." \
"" \
" -l [filter] Field to use as filter entity." \
" This field is required for the scraper to pick entries up." \
"" \
" help | -h | --help Print out this help." \
"" \
" Invoked without arguments, bib-due will scrape the file defined in BIBFILE environment variable, " \
" filtering entries with the 'due' field, and getting the values for 'due', 'priority', 'author', " \
" and 'title' fields. It will then print the entries to stdout." \
"" \
" Example output line:" \
"" \
' 2020-06-25 (1): Sergei Gerasymchuk -- “Ze” time in Ukraine (Gerasymchuk2019) ' \
""
}
filter_until() {
# filter for dates, with line numbers
filtered=$(echo "$entries" | grep -noE '[[:digit:]]{4}-[[:digit:]]{2}-[[:digit:]]{2}')
# redirect entries to fifo pipe
mkfifo filteredentries
finish() {
rm filteredentries
}
trap finish EXIT
echo "$filtered" >filteredentries &
# find first date past until filter
lastline=""
while IFS= read -r line; do
cond=$(printf '%s' "$line" | cut -d: -f2)
cond=$(date -d "$cond" +%s)
if [ "$cond" -gt "$until" ]; then
lastline=$(printf '%s' "$line" | cut -d: -f1)
break
fi
done <filteredentries
# special cases all in filter, or none in filter
if [ -z "$lastline" ]; then
return
elif [ "$lastline" -eq 1 ]; then
entries=""
# filter
else
# remove lines below found
lastprinted="$((lastline - 1))"
entries=$(echo "$entries" | sed -n "1,${lastprinted}p;${lastline}q")
fi
}
filter_priority() {
priority="$1"
# filter for dates, with line numbers
# filtered=$(echo "$entries" | grep -noE '[[:digit:]]{4}-[[:digit:]]{2}-[[:digit:]]{2}')
filtered=""
while [ "$priority" -gt 0 ]; do
current=$(echo "$entries" | grep -E "\($priority\)")
# append found to filtered entries
filtered=$(printf "%s\n%s" "$filtered" "$current")
# go to next 'higher' priority
priority="$((priority - 1))"
done
# sort them chronologically again, remove empty lines
entries="$(echo "$filtered" | sed -e '/^$/d' | sort)"
}
main() {
if [ -z "$file" ]; then
echo "Requires a bibtex file as argument."
exit 1
fi
# filter all entries for those containing filterby field (default: due)
# retain values of all fields mentioned in fields variable
entries=$(grep -E "^@|$fields" "$file" | awk 1 ORS=' ' | sed -E 's/@\w+\{/\n/g' | grep "$filterby" | tail -n +2 | sed -E 's/(,\s+(\w+)\s+=\s+|,\s*$)/\t/g' | awk -F'\t' '{ print $4 "\t" $5 "\t" $2 "\t" $3 "\t" $1 }')
# prettify and sort the entries for display (remove {}, order by date,prio,author,title)
entries=$(echo "$entries" | awk -F'\t' '{ gsub(/{/,""); gsub(/}/,""); gsub(/prio/,"",$2) } { print $1 " (" $2 "): " $3 " -- " $4 " (" $5 ")"}' | sort)
if [ -n "$until" ]; then
filter_until
fi
if [ -n "$priority" ]; then
filter_priority "$priority"
fi
echo "$entries"
}
while getopts "h?i:u:r:l:p:" opt; do
case "$opt" in
h | \?)
show_help
exit 0
;;
# v) verbose=1
# ;;
r)
fields="$OPTARG"
;;
l)
filterby="$OPTARG"
;;
i)
file="$OPTARG"
;;
u)
until="$(date -d "$OPTARG" +%s)"
;;
p)
priority="$OPTARG"
;;
esac
done
shift $((OPTIND - 1))
[ "${1:-}" = "--" ] && shift
main "$@"