index.js

'use strict';
/* eslint-disable standard/no-callback-literal */
/* jshint esversion:6*/
/* jshint node:true */

const cacache = require('cacache');
const path = require('path');
//const child_process = require("child_process"); //I still dont know why this gave error on some user
const npm = require('npm');

// const npm_cache = child_process.execSync("npm config get cache").toString().trim();
// console.log("Cache is at '" + npm_cache + "'");

const usage = '' +
  '\n\tnpm-cache-list      (show this list)' +
  '\n\tnpm-cache-list help (show this list)' +
  '\n\tnpm-cache-list all  (show all versioned packages - takes long to complete)' +
  '\n\tnpm-cache-list list <search terms> (search the cache - terms are combined with "or", not "and")';

exports = module.exports = cache;

function npmconfig() {
  return new Promise(resolve =>
    npm.load({
      some: 'config'
    }, function (er, conf) {
      if (er) console.log(er);
      if (!er) resolve(conf.config.get("cache"));
    }));
}

function cache(args) {
  const cmd = args.shift();
  let result;
  switch (cmd) {
    case 'all':
      console.log("Listing all versioned packages, this will take some time");
      result = list([]);
      break;
    case 'ls':
    case 'list':
      console.log("Listing packages including search terms:", args);
      result = list(args);
      break;
    case 'help':
    default:
      console.log('Usage: ' + cache.usage);
      npmconfig().then(npm_cache => console.log("\nCache Location is:", npm_cache))
        .catch(err => console.log("Error on getting cache location", err.message));
  }
}

cache.usage = usage;

cache.list = list;

function list(searchterms) {
  npmconfig().then(npm_cache => {
    console.log("\nCache Location is:", npm_cache);
    const cache = path.join(npm_cache, '_cacache');
    let prefix = cache;
    if (prefix.indexOf(process.env.HOME) === 0) {
      prefix = '~' + prefix.substr(process.env.HOME.length);
    }
    return cacache.ls(cache).then((files) => {
      var allpackages = [];
      for (var file in files) {
        if (files[file].metadata !== undefined) {
          const id = files[file].metadata.id;
          if (id !== undefined) {
            let name = id.replace(/@/g, " ").trim().split(" ");
            let at = id[0] === "@" ? "@" : " ";
            allpackages.push({
              "package": name[0],
              "version": name[1],
              "scoped": at
            });
          }
        }
      }
      allpackages.sort((a, b) => {
        if (a.version < b.version) {
          return 1;
        } else {
          return -1;
        }
      }).sort((a, b) => {
        if (a.package.toLowerCase() > b.package.toLowerCase()) {
          return 1;
        } else {
          return -1;
        }
      });
      if (searchterms.length > 0) {
        allpackages = allpackages.filter(function (onepackage) {
          return onepackage.package.toLowerCase().includes(searchterms[0].toLowerCase());
        });
      }
      for (var index in allpackages) {
        var onepackage = allpackages[index];
        console.log(onepackage.scoped + onepackage.package + "@" + onepackage.version);
      }
    });
  }).catch(err => console.log("Error happened", err.message));
}