Taskwarrior hook that stops all active tasks when "task FILTER start" is run. PoC for https://bug.tasktools.org/browse/TW-1712

on-launch_stopstarted.sh

#!/usr/bin/env bash
# Stops all previously active tasks on "task FILTER start"
#
# Only pending tasks are checked/stopped.  If you really want to stop
# started tasks that are completed/deleted, remove the status:pending
# filter.  Note that this will decrease performance, and should not
# be necessary.

tw_command=""
for i in "$@"; do
  if [ "${i:0:8}" == "command:" ]; then
    tw_command="${i:8}"
    break
  fi
done

if [ "$tw_command" == "start" ]; then
  for t in $(task status:pending +ACTIVE _uuids); do
    task $t stop
  done
fi