Find all "require"s for dependencies and find out if all "require"s have matching dependencies

node-find-dep-requires.sh

#!/bin/sh

# Requires ag - The Silver Searcher (https://github.com/ggreer/the_silver_searcher)

# (no options) - checks if dependencies are in use
# -d - checks if all requires have a matching dependency entry

# One-liner that checks for in-use dependencies
# grep -Pzo "(?s)(?<=\"dependencies\": {)[^}]+" package.json | grep -ohP "(?<=\")[^\"]+(?=\":)" | xargs -L1 --replace sh -c "if ! ag \"require[\\( ]'{}'\" > /dev/null 2> /dev/null; then printf '\\033[1;31mREQUIRE NOT FOUND:\\t%s\033[m\\n' {}; else printf 'Require found:\\t\\t%s\\n' {}; fi"

requires="$(ag "require(\(| )('|\")[^'\"]+" | grep -ohP "(?<=require[\( ]('|\"))[^'\"/]+(?=('|\"))" | sort -u)"
dependencies="$(grep -Pzo "(?s)(?<=\"dependencies\": {)[^}]+" package.json | grep -ohP "(?<=\")[^\"]+(?=\":)")"
devDependencies="$(grep -Pzo "(?s)(?<=\"devDependencies\": {)[^}]+" package.json | grep -ohP "(?<=\")[^\"]+(?=\":)")"
nativeModules="$(node -e "console.log(Object.keys(process.binding('natives')).filter(function (el) {return !/^_|^internal/.test(el) && ['freelist', 'sys'].indexOf(el) === -1;}).join('\\n'))")"

if [ "$1" = "-d" ]; then
  printf '%s\n' "$requires" | while IFS= read -r line
  do
    if [ ! -z "$(echo "$dependencies" | grep -Pzo "^$line$")" ]; then
      printf 'Dependency found:\t%s\n' $line
    elif [ ! -z "$(echo "$devDependencies" | grep -Pzo "^$line$")" ]; then
      printf 'Dev dependency found:\t%s\n' $line
    elif [ ! -z "$(echo "$nativeModules" | grep -Pzo "^$line$")" ]; then
      printf 'Native module found:\t%s\n' $line
    else
      printf '\033[1;31mDEPENDENCY NOT FOUND:\t%s\033[m\n' $line
    fi
  done
else
  printf '%s\n' "$dependencies" | while IFS= read -r line
  do
    if [ ! -z "$(echo "$requires" | grep -Pzo "^$line$")" ]; then
      printf 'Require found:\t\t%s\n' $line
    else
      printf '\033[1;31mREQUIRE NOT FOUND:\t%s\033[m\n' $line
    fi
  done
  printf '%s\n' "$devDependencies" | while IFS= read -r line
  do
    if [ ! -z "$(echo "$requires" | grep -Pzo "^$line$")" ]; then
      printf 'Require found:\t\t%s\n' $line
    else
      printf '\033[1;31mREQUIRE NOT FOUND:\t%s\033[m\n' $line
    fi
  done
fi