#!/usr/bin/env bash

set -E -o errexit -o nounset -o pipefail

# Exit silently if required tools are missing
command -v shellcheck > /dev/null 2>&1 || exit 0
command -v file > /dev/null 2>&1 || exit 0
command -v jq > /dev/null 2>&1 || exit 0

input=$(cat)
file_path=$(printf '%s' "$input" | jq -r '.tool_input.file_path // empty')

[[ -z "$file_path" || ! -f "$file_path" ]] && exit 0

file_type=$(file --brief "$file_path")
case "$file_type" in
  *"Bourne-Again shell"*|*"bash"*|*"/bin/bash"*) ;;
  *"shell script"*|*"/bin/sh"*) ;;
  *) exit 0 ;;
esac

shellcheck --format=gcc "$file_path" >&2