#!/bin/sh
# script/lint: run the linter (eslint, then prettier --check).
#
# Linting is containerized. ESLint results depend on the ESLint version, and
# the pinned one is the one in the image; a host's own install must not be
# able to decide whether this repo is green. From a host this therefore builds
# the Dockerfile's `lint` stage, which runs this same script inside the image.
#
# AUTISTMASK_LINT_NATIVE is set only in that image (see the Dockerfile) and is
# what stops the recursion, so `make check` inside the CI build lints in place
# instead of trying to reach a docker daemon it does not have.
set -eu

ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"

main() {
    cd "$ROOT"

    case "${AUTISTMASK_LINT_NATIVE:-}" in
    1)
        echo "Linting..."
        yarn run lint 2>&1
        return 0
        ;;
    "") ;;
    *)
        # Set but not recognized: say so rather than silently taking the
        # docker path, which would look like the variable had no effect.
        echo "lint: AUTISTMASK_LINT_NATIVE is set to" \
            "'${AUTISTMASK_LINT_NATIVE}'; the only recognized value is 1" >&2
        exit 1
        ;;
    esac

    if ! command -v docker >/dev/null 2>&1; then
        echo "lint: docker is required; linting does not run on the host" >&2
        exit 1
    fi

    echo "Linting in the pinned container..."
    # --progress=plain: the default progress renderer collapses the lint
    # output on success, and a lint run whose output cannot be seen is not
    # evidence that it ran.
    #
    # --output=type=cacheonly: the exit status is the whole result; exporting
    # an image afterwards costs about ten times the lint itself.
    docker build --progress=plain --target lint \
        --output=type=cacheonly . 2>&1
}

main "$@"