generate_practice_exercise

#!/usr/bin/env bash

# Exit if anything fails.
set -euo pipefail

# If argument not provided, print usage and exit
if [ -z "$1" ]; then
    echo "Usage: bin/generate_practice_exercise <exercise-slug>"
    exit 1
fi

if ! [ -x "$(command -v jq)" ]; then
    echo "jq is required. Please install jq and make sure it is on the $PATH: https://stedolan.github.io/jq/download/" >&2
    exit 1
fi

if ! [ -x "$(command -v emacs)" ]; then
    echo "Emacs is required. Please install Emacs and make sure it is on the $PATH: https://www.gnu.org/software/emacs/download.html" >&2
    exit 1
fi

SLUG="$1"
exercise_dir="exercises/practice/${SLUG}"

download() {
    file="$1"
    url="$2"
    curl --silent --show-error --fail --retry 3 --max-time 3 \
        --output "$file" "$url"
}

# build configlet
echo "Fetching latest version of configlet..."
./bin/fetch-configlet

# Preparing config.json
echo "Adding instructions and configuration files..."
UUID=$(bin/configlet uuid)
jq --arg slug "$SLUG" --arg uuid "$UUID" \
    '.exercises.practice += [{slug: $slug, name: "TODO", uuid: $uuid, practices: [], prerequisites: [], difficulty: 5}]' \
    config.json > config.json.tmp
# jq always rounds whole numbers, but average_run_time needs to be a float
sed -i 's/"average_run_time": \([[:digit:]]\+\)$/"average_run_time": 2.0/' config.json.tmp
mv config.json.tmp config.json

# Create instructions and config files
./bin/configlet sync --update --yes --docs --filepaths --metadata --exercise "$SLUG"

pushd tools
emacs -batch -l install-packages.el -l practice-exercise-generator.el --eval "(exercism/generate-practice-exercise \"$SLUG\")"
popd

echo "All stub files were created. After implementing the solution, tests and configuration, please run:"
echo "    ./bin/configlet sync --update --tests --exercise ${SLUG}"
echo "    ./bin/configlet fmt --update --yes --exercise ${SLUG}"