SimpleCov `# :nocov:` -> `# simplecov:disable` `# simplecov:enable` migration script

simple-cov-migrate.sh

find . -type f -name '*.rb' -print0 |
while IFS= read -r -d '' file; do
  count=$(grep -cF '# :nocov:' "$file")

  if (( count % 2 != 0 )); then
    echo "ERROR: unmatched # :nocov: in $file" >&2
    exit 1
  fi

  awk '
    /# :nocov:/ {
      if (n % 2 == 0)
        sub(/# :nocov:/, "# simplecov:disable")
      else
        sub(/# :nocov:/, "# simplecov:enable")
      n++
    }
    { print }
  ' "$file" > "$file.tmp" &&
  mv "$file.tmp" "$file"
done

# ref.
# https://github.com/simplecov-ruby/simplecov/blob/d145158bdc67f6034dce98c40a9c82147b291364/docs/Configuration.md#ignoring-implicit-else-branches
# deprecation warning message:
# [DEPRECATION] `# :nocov:` is deprecated and will be removed in a future release. Replace with `# simplecov:disable` / `# simplecov:enable` block comments.