feat: updated 'npm install' command

- functionality to get diff and explicitRequets from arborist instace
  requires @npmcli/arborist@0.0.0-pre.12
- create printResult function
- output install action time (fairly naively)
- added functionality to create and print archy dep tree

lib/install.js

@@ -16,7 +16,30 @@
 
 module.exports = install
 
-var usage = require('./utils/usage')
+// --- node core modules
+const fs = require('fs')
+// - @npmcli modules
+const Arborist = require('@npmcli/arborist')
+const log = require('npmlog')
+const validate = require('aproba')
+// - deps
+const asyncMap = require('slide').asyncMap // XXX remove this
+const archy = require('archy')
+// - npm internal utils
+const audit = require('./install/audit.js')
+const {
+  getPrintFundingReport,
+  getPrintFundingReportJSON
+} = require('./install/fund.js')
+const usage = require('./utils/usage')
+const npm = require('./npm.js')
+const output = require('./utils/output.js')
+const errorMessage = require('./utils/error-message.js')
+// XXX this file doesn't exist anymore; remove this
+// const sillyLogTree = require('./util/silly-log-tree.js')
+// ---
+
+const path = require('path')
 
 install.usage = usage(
   'install',
@@ -34,8 +57,6 @@ install.usage = usage(
   '[--save-prod|--save-dev|--save-optional] [--save-exact] [--no-save]'
 )
 
-const npa = require('npm-package-arg')
-
 install.completion = function (opts, cb) {
   validate('OF', arguments)
   // install can complete to a folder with a package.json, or any package.
@@ -95,69 +116,120 @@ install.completion = function (opts, cb) {
   cb()
 }
 
-const Arborist = require('@npmcli/arborist')
-
-// dependencies
-var log = require('npmlog')
-// const sillyLogTree = require('./util/silly-log-tree.js')
-
-// npm internal utils
-var npm = require('./npm.js')
-var output = require('./utils/output.js')
-var saveMetrics = require('./utils/metrics.js').save
-
-// install specific libraries
-var audit = require('./install/audit.js')
-var {
-  getPrintFundingReport,
-  getPrintFundingReportJSON
-} = require('./install/fund.js')
-var errorMessage = require('./utils/error-message.js')
-
-const path = require('path')
-
-function install (where, args, cb) {
+async function install (where, args, cb) {
   if (!cb) {
     cb = args
     args = where
     where = null
   }
+
   // the /path/to/node_modules/..
   const globalTop = path.resolve(npm.globalDir, '..')
-  if (!where) {
-    where = npm.flatOptions.global
+  const {
+    dryRun,
+    global: isGlobalInstall
+  } = npm.flatOptions
+
+  // Determine where install is happening
+  // - If `where` is NOT set, then we need to determine if it's a global install
+  //    or if it's a local context install (hence nested ternary)
+  // - `where` IS SET, just use it
+  where = (!where)
+    ? (isGlobalInstall)
       ? globalTop
       : npm.prefix
-  }
-  const {dryRun} = npm.flatOptions
+    : where
 
   // TODO: Add warnings for other deprecated flags
   if (npm.config.get('dev')) {
     log.warn('install', 'Usage of the `--dev` option is deprecated. Use `--include=dev` instead.')
   }
 
+  // If global install, and NO args passed; user meant "this directory context"
   if (where === globalTop && !args.length) {
     args = ['.']
   }
+
+  // XXX What does this do?
   args = args.filter(a => path.resolve(a) !== npm.prefix)
 
-  const arb = new Arborist({
-    ...this.flatOptions,
-    path: where,
-  })
+  // Create arborist object to work with
+  const arb = new Arborist({ ...npm.flatOptions, path: where })
 
   // TODO:
   // - audit
   // - funding
-  // - more logging (archy-ize the tree for silly logging)
   // - global installs in Arborist
 
-  const opt = {
-    ...this.flatOptions,
-    add: args,
-  }
-  arb[dryRun ? 'buildIdealTree' : 'reify'](opt).then(tree => {
-    output('TREEEEEEEE', tree)
+  const arbCallOpts = { ...npm.flatOptions, add: args }
+
+  try {
+    const start = Date.now()
+
+    const tree = (dryRun)
+      ? await arb.buildIdealTree(arbCallOpts)
+      : await arb.reify(arbCallOpts)
+
+    const stop = Date.now()
+
+    // Print list of installed packages and their version
+    // Buffer with newline
+    output('')
+    arb.diff.children.forEach(diff => {
+      const node = diff.ideal
+      if (diff.action === 'ADD' && arb.explicitRequests.has(node.name)) {
+        output(`+ ${node.name}@${node.package.version}`)
+      }
+    })
+
+    /**
+     * TODO:
+     * - Add audit
+     * - Add funding
+     */
+
+    printResults({ start, stop }, tree, arb)
     cb()
-  }, er => cb(er))
+  } catch (err) {
+    const msg = errorMessage(err)
+    msg.summary.forEach(s => log.warn.apply(log, s))
+    msg.detail.forEach(d => log.verbose.apply(log, d))
+    cb(err)
+  }
+}
+
+function printResults (timing, tree, arb) {
+  const { unicode } = npm.flatOptions
+
+  // Create archy tree from arborist tree
+  const reducedTree = reduceArbTree(tree)
+  const archyTree = archy(reducedTree, '', { unicode })
+
+  // Collect information about command action taken
+  const pkgCount = arb.diff.children.length
+  const contribCount = pkgCount
+  const added = `added ${pkgCount}`
+
+  const from = `from ${contribCount} contributor${contribCount ? 's' : ''}`
+  const audited = `audited ${0} package${'s'}`
+  const time = (timing.stop - timing.start) / 1000
+
+  // Print summary of command action taken
+  output(`${added}, ${from}, and ${audited} in ${time}s`)
+
+  // Optionally print the top level dependency tree
+  log.silly('topLevelDepTree', archyTree)
+}
+
+function reduceArbTree (rootNode) {
+  const initialValue = {
+    label: rootNode.name,
+    nodes: []
+  }
+  const rootChildrenMap = rootNode.children
+  for (const child of rootChildrenMap.keys()) {
+    initialValue.nodes.push(child)
+  }
+
+  return initialValue
 }