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Filename : nodenv-version-file

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#!/usr/bin/env bash
# Usage: nodenv version-file [<dir>]
# Summary: Detect the file that sets the current nodenv version
set -e
[ -n "$NODENV_DEBUG" ] && set -x

target_dir="$1"

find_local_version_file() {
  local root="$1"
  while ! [[ "$root" =~ ^//[^/]*$ ]]; do
    if [ -s "${root}/.node-version" ]; then
      echo "${root}/.node-version"
      return 0
    fi
    [ -n "$root" ] || break
    root="${root%/*}"
  done
  return 1
}

if [ -n "$target_dir" ]; then
  find_local_version_file "$target_dir"
else
  find_local_version_file "$NODENV_DIR" || {
    [ "$NODENV_DIR" != "$PWD" ] && find_local_version_file "$PWD"
  } || echo "${NODENV_ROOT}/version"
fi