nvm-windows auto switch node version by current working directory for git-bash

nvm-windows-auto-switch-node-for-git-bash.sh

# Put this in your ~/.bashrc please

# To set node version by folder
# run: echo "v8.5.0" > .nvmrc

nvm_echo() {
  command printf %s\\n "$*" 2>/dev/null
}

# Traverse up in directory tree to find containing folder
nvm_find_up() {
  local path_
  path_="${PWD}"
  while [ "${path_}" != "" ] && [ ! -f "${path_}/${1-}" ]; do
    path_=${path_%/*}
  done
  nvm_echo "${path_}"
}

nvm_find_nvmrc() {
  local dir
  dir="$(nvm_find_up '.nvmrc')"
  if [ -e "${dir}/.nvmrc" ]; then
    nvm_echo "${dir}/.nvmrc"
  fi
}

load-nvmrc() {
  local node_version="$(node -v)"
  local nvmrc_path="$(nvm_find_nvmrc)"

  if [ ! -z "$nvmrc_path" ]; then
    local nvmrc_node_version=$(cat "${nvmrc_path}")
  fi

  local target_version="${nvmrc_node_version:-v14.15.4}"

  if [ "$target_version" != "$node_version" ]; then
    echo "Switch node from $node_version to $target_version"
    nvm use $target_version
  else
    echo "node in use $target_version"
  fi
}

# create a PROPMT_COMMAND equivalent to store chpwd functions
typeset -g CHPWD_COMMAND="load-nvmrc"

_chpwd_hook() {
  shopt -s nullglob

  local f

  # run commands in CHPWD_COMMAND variable on dir change
  if [[ "$PREVPWD" != "$PWD" ]]; then
    local IFS=$';'
    for f in $CHPWD_COMMAND; do
      "$f"
    done
    unset IFS
  fi
  # refresh last working dir record
  export PREVPWD="$PWD"
}

# add `;` after _chpwd_hook if PROMPT_COMMAND is not empty
PROMPT_COMMAND="_chpwd_hook${PROMPT_COMMAND:+;$PROMPT_COMMAND}"