#!/bin/sh
# hack/seed/run-prose.sh <rastrillo checkout> <seed commit>
#
# Runs the prose exporter inside a scratch rastrillo worktree at the
# seed commit and writes its output into this checkout: the design
# system's explanations, examples/prose.json, and the review queue,
# hack/seed/prose-review.json. It reads the committed examples.json
# and sources.json and nothing else of run.sh's output, and it never
# runs TestFiestaSeed: the examples are seeded once, the prose can be
# re-read whenever the tables change.
#
# The worktree goes under $TMPDIR, which must be set: this runs on a
# shared machine, and /tmp is not scratch there. A worktree already at
# that path belongs to another run and is left alone. Once this run
# has made its own, the trap removes it and the copied file whether
# the run passed, failed or was interrupted.
#
#   hack/seed/run-prose.sh ~/src/rastrillo e14b745a7c08d0efa3bf221a8b6a5e75de15c46f
set -eu

if [ $# -ne 2 ]; then
	echo "usage: $0 <rastrillo checkout> <seed commit>" >&2
	exit 2
fi
if [ -z "${TMPDIR:-}" ]; then
	echo "run-prose.sh: TMPDIR is unset; set it to scratch space on disk, not /tmp" >&2
	exit 2
fi
checkout=$1
seed=$2
here=$(cd "$(dirname "$0")" && pwd)
fiesta=$(cd "$here/../.." && pwd)
wt="$TMPDIR/rastrillo-prose"

if [ -e "$wt" ]; then
	echo "run-prose.sh: $wt already exists; another run may be using it. Remove it by hand if not." >&2
	exit 1
fi

# cleanup runs from the EXIT trap, installed only once the worktree
# below is ours. It keeps the run's own exit status, and a worktree
# that could not be removed is reported and makes the run fail rather
# than being hidden; prune runs either way.
cleanup() {
	status=$?
	rm -f "$wt/internal/designsystem/prose_fiestaseed_test.go"
	if ! git -C "$checkout" worktree remove --force "$wt"; then
		echo "run-prose.sh: could not remove the scratch worktree $wt; remove it by hand" >&2
		if [ "$status" -eq 0 ]; then
			status=1
		fi
	fi
	git -C "$checkout" worktree prune
	exit "$status"
}

git -C "$checkout" worktree add --detach "$wt" "$seed"
trap cleanup EXIT
# A signal exits, and the EXIT trap then cleans up.
trap 'exit 130' INT TERM

cp "$here/_rastrillo/prose_fiestaseed_test.go" "$wt/internal/designsystem/"

cd "$wt"
GOFLAGS=-mod=mod FIESTA_SEED_OUT="$fiesta" go test -tags fiestaseed -run '^TestFiestaProse$' ./internal/designsystem/ -count=1 -v