#!/bin/sh
# script/fmt-check: check the formatting of this repo's markdown and
# CSS (read-only). Like script/lint, it runs only in Docker: it builds
# the `fmt-check` stage of Dockerfile.lint, where prettier runs as a
# build step. Leaving prettier to run on the host here would have left
# `make check` with a host lint path, which is the thing being removed.
#
# The version, scope and flags live in Dockerfile.lint and must stay in
# sync with script/fmt, which is the authoritative copy and stays on the
# host because it writes to the working tree.
#
# Dockerfile.lint requires the CHECK_EPOCH build argument, generated
# here exactly as script/cibuild generates it -- see that script for why
# the check layer must not be allowed to cache, and why the value is
# built in an assignment rather than inline.
set -eu

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

main() {
    cd "$ROOT"
    epoch="$(date +%s%N)$$"
    docker build -f Dockerfile.lint --target fmt-check \
        --build-arg CHECK_EPOCH="$epoch" .
}

main "$@"