run-tests

#!/usr/bin/env bash
set -eo pipefail

execute_test() {
  (
    cd "${1}"
    # Get the exercise name from the directory
    local exercise_name
    exercise_name=$(echo "$1" | tr '-' '_')

    printf '%s\n' "Running tests for ${1}..." >&2

    # Copy the examples with the correct name for the exercise
    if [[ -f "./.meta/example.zig" ]]; then
      mv ./.meta/example.zig "${exercise_name}".zig
      # No building required, just test it
      zig test "test_${exercise_name}.zig"
      printf '\n' >&2
    else
      printf '%s\n' "Error: ${exercise_name} lacks its '.meta/example.zig' file" >&2
      exit 1
    fi
  )
}

main() {
  # Move to the root directory of the repo so you can run this script from anywhere
  local script_dir
  script_dir="$(cd "$(dirname "$0")" >/dev/null 2>&1 && pwd)"
  cd "${script_dir}"/..

  if [[ ! -d "exercises/practice" ]]; then
    printf '%s\n' "Error: the 'exercises/practice' directory is missing" >&2
    exit 1
  fi

  # Clear up any previous run
  rm -rf build

  cp -r exercises/practice build

  (
    cd build/

    # Allow specifying which tests to run as arguments
    if [[ $# -gt 0 ]]; then
      local exercises=("$@")
      for exercise in "${exercises[@]}"; do
        if [[ ! -d "${exercise}" ]]; then
          printf '%s\n' "Error: the specified exercise '${1}' does not exist" >&2
          exit 1
        fi
      done
    else
      local exercises=(*)
    fi

    for exercise in "${exercises[@]}"; do
      execute_test "${exercise}"
    done
  )

  # Clean up duplicate exercises
  rm -rf build
}

main "$@"