Add NVM node precedence if available

[verebes1]

Feature

This PR makes use of NVM if it is available first before trying other node binaries. For example if you use a different node version based on your project using .nvmrc then the pre-commit hook will automatically pick that up first and use that node version for running the pre-commit commands.

How to test

1. Create a new project using npm init or use an existing project
2. Add a new .nvmrc file with the desired node version for example 18.16.0 you can use the following command: echo 18.16.0 > .nvmrc
3. Install pre-commit npm i pre-commit -D
4. Navigate to the node_modules/pre-commit folder and edit the hook file and add the following contents

#!/usr/bin/env bash

HAS_NODE=`which node 2> /dev/null || which nodejs 2> /dev/null || which iojs 2> /dev/null`

#
# There are some issues with Source Tree because paths are not set correctly for
# the given environment. Sourcing the bash_profile seems to resolve this for bash users,
# sourcing the zshrc for zshell users.
#
# https://answers.atlassian.com/questions/140339/sourcetree-hook-failing-because-paths-don-t-seem-to-be-set-correctly
#
function source_home_file {
  file="$HOME/$1"
  [[ -f "${file}" ]] && source "${file}"
}

if [[ -z "$HAS_NODE" ]]; then
  source_home_file ".bash_profile" || source_home_file ".zshrc" || source_home_file ".bashrc" || true
fi

[ "$NVM_DIR" = "" ] && export NVM_DIR="$HOME/.nvm"
if [ -f "$NVM_DIR/nvm.sh" ]; then
  [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
  [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
  nvm install
  nvm use
fi

NVMNODE=`nvm which node 2> /dev/null`
NODE=`which node 2> /dev/null`
NODEJS=`which nodejs 2> /dev/null`
IOJS=`which iojs 2> /dev/null`
LOCAL="/usr/local/bin/node"
BINARY=

#
# Figure out which binary we need to use for our script execution.
#
if [[ -n "$NVMNODE" ]]; then
  BINARY="$NVMNODE"
elif [[ -n "$NODE" ]]; then
  BINARY="$NODE"
elif [[ -n "$NODEJS" ]]; then
  BINARY="$NODEJS"
elif [[ -n "$IOJS" ]]; then
  BINARY="$IOJS"
elif [[ -x "$LOCAL" ]]; then
  BINARY="$LOCAL"
fi

if [ ! -f "$BINARY" ]; then
  echo "something wrong: node not exist"
  exit 1
fi
#
# Add --dry-run cli flag support so we can execute this hook without side affects
# and see if it works in the current environment
#
if [[ $* == *--dry-run* ]]; then
  if [[ -z "$BINARY" ]]; then
    exit 1
  fi
else
  "$BINARY" "$("$BINARY" -e "console.log(require.resolve('pre-commit'))")"
fi

Add pre-commit hooks to your package.json file as per the Readme of the repo and it should use your desired node version.