sitd

#!/bin/sh
# Copyright 2017 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0/
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

# sitd sends you periodic reminders to sit up straight.  To prevent
# desensitization, it sends them at random intervals.  We shouldn't send
# reminders too frequently, though.
readonly MIN=5  # minutes
readonly MAX=25

# The implementation is quite simple.  We wait a random amount of time somewhere
# between $MIN and $MAX minutes, and then we send a notification.
while true; do
  sleep $(echo "$MIN * 60 + $RANDOM % (($MAX - $MIN) * 60)" | bc)
  notify-send -i object-flip-vertical 'Sit up!' 'Please sit up straight.'
done