nix-files/pkgs/additional/sane-scripts/src/sane-deadlines

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#!/usr/bin/env bash
# processes a tab-separated "deadlines" file and alerts for any upcoming events.
#
# deadlines.tsv file format:
# - <date>\t<reminder-interval>\t<event>
# - no header
# - one line per entry
# - <event> may contain any non-newline and non-tab characters
# - <notice-interval> is the number of days before the event to start alerting, followed by 'd', e.g. `14d`
# - <date> should be lexicographically orderable and machine-parsable, e.g. `2023-03-14`
#
# example `deadlines.tsv`
# 2023-03-14 1d celebrate pi day!
# 2023-04-18 14d taxes due
# 2023-04-01 7d the other pie day :o
# configurables:
deadlines=~/knowledge/planner/deadlines.tsv
if ! test -f "$deadlines"; then
echo "WARNING: $deadlines sane-deadlines file not found"
exit 1
fi
now=$(date +%s)
sort "$deadlines" | while read line; do
# parse line
deadline_field=$(echo "$line" | cut -f 1)
threshold_field=$(echo "$line" | cut -f 2)
description_field=$(echo "$line" | cut -f 3)
# normalize dates into seconds since unix epoch
deadline=$(date -d "$deadline_field" +%s)
threshold=$(echo "$threshold_field" | sed 's/d/day /g')
birthtime=$(date -d "$deadline_field - $threshold" +%s)
# show the event iff it's near
if test "$now" -ge "$birthtime"; then
days_until=$(( ($deadline - $now) / (24*60*60) ))
echo "in $days_until day(s): $description_field"
fi
done