taskcont

#!/usr/bin/env bash
#
# taskcont, timecont, tasklast, timelast
#   resume the last or second to last recorded task or time interval
#
# desc:
#   - starts the last worked task in timewarrior database
#   - if 'task' then given timew interval must also be in taskw db
#   - if 'time' then time/ prefix will match (ie, no taskw task)
#   - if 'cont' then start the last worked task
#   - if 'last' then start the task before that
#
# scott@smemsh.net
# https://github.com/smemsh/taskwtools/
# https://spdx.org/licenses/GPL-2.0
#

taskcont () { resume_task; }
timecont () { resume_task; }
tasklast () { resume_task; }
timelast () { resume_task; }

resume_task ()
{
	local candidate lastcand interval

	fql_of_interval ()
	{
		printf $(
			timew export \
			| jq -r ".[] | select(.id == ${1:?}) | .tags[]" \
			| grep -v -e ^+ -e /$ \
			| paste -sd,
		)
	}

	interval=1
	while true
	do
		candidate=$(fql_of_interval $interval)
		let interval++

		if [[ $cmdprefix == "task" ]]
		then if [[ ${candidate:0:5} == "time/" ]]; then
			continue; fi; fi

		if [[ $cmdsuffix == "cont" ]]; then
			break; fi

		if [[ $lastcand ]]
		then [[ $candidate == $lastcand ]] && continue || break; fi

		if ! [[ $candidate ]]
		then echo "cannot find last fql" >&2; false; return; fi

		lastcand=$candidate
	done

	# after the loop, we are one past the target
	let interval--

	# when used non-interactively, it's probably rptaskline, which
	# already compares before/after tasklines and shows delta.  we
	# don't want failure on no-change because rptaskline reports
	# failure, and timecont on already open labels is idempotent, so
	# no failure per se.  shown delta will make clear that state did
	# not change.  interactively, this should fail however, so it's
	# not confusing when a new interval seems to have been made
	#
	if ((interval == 1)) && tty -s
	then timew continue # aborts if @1 is an open interval
	else timew continue @$interval # succeeds whether @1 open or closed
	fi
}

main ()
{
	cd "$startdir" || exit

	cmdprefix=${invname:0:4}
	cmdsuffix=${invname:(-4)}

	if [[ $(declare -F $invname) ]]
	then $invname "$@"
	else echo "unimplemented command '$invname'" >&2; fi
}

startdir=$HOME
invname=${0##*/}
invdir=${0%/*}

[[ $invname == cont ]] && invname=timecont

main "$@"