pre-commit

#!/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 -euo pipefail

script_dir=$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")

tf_modules=$("$script_dir/../.github/scripts/collect-modules.sh")

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

if command_exists terraform; then
  # `terraform fmt` doesn't ignore non-tf files automatically
  tf_files=$(echo "$files" | { grep -E '\.tf$' || true; })

  echo "$tf_files" | xargs terraform fmt
fi

if command_exists terraform-docs; then
  for tf_module in $tf_modules; do
    terraform-docs markdown "$tf_module" --output-file "README.md"

    # Extend `$files` to make `prettier` format the generated README.md
    files="$files $tf_module/README.md"
  done
fi

if command_exists npm; then
  npm run codegen
  files="$files $script_dir/../iam-policies/terraform/policies"
fi

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

# We don't have `tflint` in pre-commit hook because it doesn't ignore files
# ignored in `.gitignore`. More details: https://github.com/terraform-linters/tflint/issues/2283

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

exit 0