test

#!/usr/bin/env bash

# Synopsis:
# Verify that each exercise's example/exemplar solution passes the tests.
# You can either verify all exercises or a single exercise.

# Example: verify all exercises
# bin/test

# Example: verify single exercise
# bin/test two-fer

set -eo pipefail

die() { echo "$*" >&2; exit 1; }

required_tool() {
    command -v "${1}" >/dev/null 2>&1 ||
        die "${1} is required but not installed. Please install it and make sure it's in your PATH."
}

required_tool jq
required_tool docker

copy_example_or_examplar_to_solution() {
    jq -c '[.files.solution, .files.exemplar // .files.example] | transpose | map({src: .[1], dst: .[0]}) | .[]' .meta/config.json \
    | while read -r src_and_dst; do
        cp "$(jq -r '.src' <<< "${src_and_dst}")" "$(jq -r '.dst' <<< "${src_and_dst}")"
    done
}

docker pull exercism/unison-test-runner

run_tests() {
    local slug

    slug="${1}"

    docker run \
        --rm \
        --network none \
        --mount type=bind,src="${PWD}",dst=/solution \
        --mount type=bind,src="${PWD}",dst=/output \
        --tmpfs /tmp:rw \
        exercism/unison-test-runner "${slug}" "/solution" "/output"
    jq -e '.status == "pass"' "${PWD}/results.json" >/dev/null 2>&1
}

verify_exercise() {
    local dir
    local slug
    local tmp_dir

    dir=$(realpath "${1}")
    slug=$(basename "${dir}")
    tmp_dir=$(mktemp -d -t "exercism-verify-${slug}-XXXXX")

    echo "Verifying ${slug} exercise..."

    (
        trap 'rm -rf "$tmp_dir"' EXIT    # remove tempdir when subshell ends
        cp -r "${dir}/." "${tmp_dir}"
        cd "${tmp_dir}"

        copy_example_or_examplar_to_solution
        run_tests "${slug}"
    )
}

exercise_slug="${1:-*}"

shopt -s nullglob
count=0
for exercise_dir in ./exercises/{concept,practice}/${exercise_slug}/; do
    if [[ -d "${exercise_dir}" ]]; then
        verify_exercise "${exercise_dir}"
        ((++count))
    fi
done
((count > 0)) || die 'no matching exercises found!'