#!/usr/bin/env sh

SAVED_PIPELINE_DIR="$DOTFILES_PATH/bin/pipelines"
mkdir -p "$SAVED_PIPELINE_DIR"

if [ -n "${1+x}" ]; then
	pdir="$SAVED_PIPELINE_DIR/$1"; shift
	mkdir -p "$pdir"
	if [ -z ${1+x} ]; then
		td="$(mktemp -p "$pdir" -d "tmp_pipeline.XXXXXXXX")"
		cleanup_trap="rm -rf \"$td\""
	else
		td="$pdir/$1"; shift
		mkdir -p "$td"
	fi
	transform="$pdir/transform"
else
	td="$(mktemp --tmpdir -d pipeline.XXXXXXXX)"
	transform="$td/transform"
	cleanup_trap="rm -rf \"$td\""
fi

[ ! -e "$transform" ] && \
	printf "#!/usr/bin/env bash\n# for %s\n\nbase64" "${td}" > "$transform"

in="$td/in"
[ -n "${1+x}" ] && in="${1}" && shift
out="$td/out"
[ -n "${1+x}" ] && out="${1}" && shift

# TODO: if no logging, log="/dev/null"
log="$td/log"

chmod +x "$transform"
echo "Hello World" > "$in"
touch "$log"

fswi \
	"bash -c 'cd \"$td\" && < \"$in\" \"$transform\" | tee \"$out\"'" \
	'in$|transform$' \
	"$td" "$pdir" > "$log" 2>&1 &

watcher="$!"

if [ -z "${cleanup_trap+x}" ]; then
	trap "kill \"$watcher\"" EXIT
else
	trap "${cleanup_trap}; kill \"$watcher\"" EXIT
fi

job="$(echo "let g:pipeline_job_id = jobstart(['inotifywait', '-m', '-e', 'close_write', '${out}'], {'detach':1,'on_stdout':{j,d,e->execute('checktime')}})" | tr "'" '"')"

echo $job >> "$log"

# this will only autosave (and therefore autoreload) for the out buffer (since
# it was opened last) - autosaving (and therefore autorunning) is potentially
# very scary
nvim -V9"$td/vimlog" \
	-o "$in" "$transform" "$out" \
	--cmd "$job" \
	--cmd 'set updatetime=250' \
	--cmd 'autocmd CursorHold,CursorHoldI <buffer> silent write' \
	--cmd 'autocmd VimLeave call jobstop(g:pipeline_job_id)' \
	--cmd "$job"