#!/usr/bin/env bash
#
# Pre-commit hook to run lightweight checks and auto-format the code. It's designed
# to be blazingly fast, so it checks only changed files. Run the following command
# to install this hook for yourself. It's a symlink, to make sure it stays always
# up-to-date.
#
# ```bash
# ln -s ../../.githooks/pre-commit .git/hooks/pre-commit
# ```

set -euxo pipefail

function command_exists() {
  bin_name=$(basename "$1")

  if command -v "$1" &> /dev/null; then
    printf "\e[0;32m[INFO] Using %s...\e[0m\n" "$bin_name"
    return 0
  fi

  printf "\e[0;33m[WARN] %s CLI was not found. Ignoring it...\e[0m\n" "$bin_name" >&2
  return 1
}

files=$(git diff --cached --name-only --diff-filter=ACMR | sed 's| |\\ |g')

if [[ -z "$files" ]]; then
  echo "No files changed. Exiting the pre-commit hook..."
  exit 0
fi

if command_exists typos; then
  echo "$files" | xargs typos
fi

if command_exists ./node_modules/.bin/prettier; then
  echo "$files" | xargs ./node_modules/.bin/prettier --ignore-unknown --write
fi

if command_exists cargo; then
  # `rustfmt` doesn't ignore non-rust files automatically
  rust_files=$(echo "$files" | { grep -E '\.rs$' || true; })

  if [[ -n "$rust_files" ]]; then
    echo "$rust_files" | xargs cargo fmt --manifest-path native/Cargo.toml --
  fi
fi

if command_exists mix; then
  echo "$files" | xargs mix format --check-formatted
fi

# Add the modified/prettified files to staging
echo "$files" | xargs git add

exit 0