Bootstrap concept exercise

bootstrap_exercise.sh

#!/usr/bin/env bash

set -euo pipefail

concept_exercise_path="/exercises/concept"

if [[ "${#}" -eq 1 ]]; then
  language="ruby"
  slug="${1:-}"
elif [[ "${#}" -eq 2 ]]; then
  language="${1:-}"
  slug="${2:-}"
fi

if [[ "${language}" == "ruby" ]]; then
  extension="rb"
else
  extension="unknown"
fi

config_file="config.json"
exercise_path="$(pwd)${concept_exercise_path}/${slug}"
docs_dir="${exercise_path}/.docs"
meta_dir="${exercise_path}/.meta"

function ruby() {
  mkdir -p "${exercise_path}"
  docs
  meta
  todo_touch "${meta_dir}/exemplar.${extension}"
  todo_touch "${exercise_path}/${slug}.${extension}"
  todo_touch "${exercise_path}/${slug}_test.${extension}"

  insert_config
}

function docs() {
  mkdir -p "${docs_dir}"
  todo_touch "${docs_dir}/hints.md"
  todo_touch "${docs_dir}/instructions.md"
  todo_touch "${docs_dir}/introduction.md"
}

function meta() {
  mkdir -p "${meta_dir}"
  todo_touch "${meta_dir}/design.md"
  config_touch "${meta_dir}/config.json"
}

function todo_touch() {
  echo "# TODO" > "${1}"
}

function config_touch() {
  user_json=$(jo github_username=placeholder exercism_username=placeholder)

  files_json=$(jo solution[]="solution.${extension}" test[]="solution_test.${extension}" examplar[]=".meta/exemplar.${extension}")

  jq -n --argjson user "${user_json}" --argjson files "${files_json}" \
    '{"authors": $ARGS.named["user"], "contributors": $ARGS.named["user"], "language_versions": "placeholder", "files": $ARGS.named["files"]}' > "${1}"
}

function insert_config() {
  uuid=$(uuidgen)

  name=$(echo "${slug}" | tr '-' ' ')
  name_split=(${name})
  name_proper="${name_split[@]^}"

  config_tmpfile=$(mktemp /tmp/config.json.XXXXXX)

  entry=$(jo \
    slug="${slug}" \
    name="${name_proper}" \
    uuid="${uuid}" \
    practices=[] \
    prerequisites=[] \
    difficulty=1 \
    status="wip")

  jq --argjson entry "${entry}" '.exercises.concept[.exercises.concept | length] |= .+ $ARGS.named["entry"]' < "${config_file}" > config_tmpfile

  mv config_tmpfile "${config_file}"
  npx prettier --write "${config_file}"
}

function installed {
  cmd=$(command -v "${1}")

  [[ -n "${cmd}" ]] && [[ -f "${cmd}" ]]
  return ${?}
}

function die {
  >&2 echo "❌ Fatal: ${@}"
  exit 1
}

deps=(jo jq uuidgen npx)
for dep in "${deps[@]}"; do
  installed "${dep}" || die "Missing '${dep}'"
done

if [[ -z "${language}" ]]; then
  die "Missing language"
fi

if [[ -z "${slug}" ]]; then
  die "Missing exercise slug"
fi

if [[ ! -f "${config_file}" ]]; then
  die "run this only in the root track repo"
fi

$language; exit