Consistent output for most reify() commands

This adds a 'reify-output.js' util, which can be passed any Arborist
object after it reifies a tree.  Consistent output is printed in all
cases, showing the number of packages added/removed/changed, packages
needing funding, and a minimal (but always actionable and relevant)
audit summary.

The only code using the Installer class now is in lib/outdated.js, which
is has a pending update coming soon.

Prune and dedupe commands are awaiting top-level Arborist methods, so
that they can be similarly tightened up. (For now, this commit just has
them fail with a 'coming soon' message.)

The last piece holding the 'install/*.js' code in this repo is that it
is used in 'ls', 'fund', 'shrinkwrap', and the error-message util.

1 files changed, 21 insertions, 32 deletions

diff --git a/lib/ci.js b/lib/ci.js
index e64bca5d6..8823139df 100644
--- a/lib/ci.js
+++ b/lib/ci.js
@@ -1,24 +1,20 @@
-'use strict'
-
 const util = require('util')
 const Arborist = require('@npmcli/arborist')
 const rimraf = util.promisify(require('rimraf'))
+const reifyOutput = require('./utils/reify-output.js')
 
+const log = require('npmlog')
 const npm = require('./npm.js')
 const output = require('./utils/output.js')
+const usageUtil = require('./utils/usage.js')
 
-cmd.usage = 'npm ci'
+const usage = usageUtil('ci', 'npm ci')
 
-cmd.completion = (cb) => cb(null, [])
+const completion = (cb) => cb(null, [])
 
-module.exports = cmd
-function cmd(cb) {
-  ci()
-    .then(() => cb())
-    .catch(cb)
-}
+const cmd = (args, cb) => ci().then(() => cb()).catch(cb)
 
-async function ci () {
+const ci = async () => {
   if (npm.flatOptions.global) {
     const err = new Error('`npm ci` does not work for global packages')
     err.code = 'ECIGLOBAL'
@@ -28,26 +24,19 @@ async function ci () {
   const where = npm.prefix
   const arb = new Arborist({ ...npm.flatOptions, path: where })
 
-  try {
-    await arb.loadVirtual()
-    const start = Date.now()
-    await rimraf(`${where}/node_modules/`)
-    await arb.reify()
-    const stop = Date.now()
-
-    const time = (stop - start) / 1000
-    const pkgCount = arb.diff.children.length
-    const added = `added ${pkgCount}`
-    output(`${added} packages in ${time}s`)
-
-  } catch (err) {
-    if (err.message.match(/shrinkwrap/)) {
-      const msg = 'The \`npm ci\` command can only install packages with an existing ' +
-      'package-lock.json or npm-shrinkwrap.json with lockfileVersion >= 1. Run an install ' +
-      'with npm@5 or later to generate a package-lock.json file, then try again.'
+  await Promise.all([
+    arb.loadVirtual().catch(er => {
+      log.verbose('loadVirtual', er.stack)
+      const msg =
+        'The `npm ci` command can only install with an existing package-lock.json or\n' +
+        'npm-shrinkwrap.json with lockfileVersion >= 1. Run an install with npm@5 or\n' +
+        'later to generate a package-lock.json file, then try again.'
       throw new Error(msg)
-    } else {
-      throw err
-    }
-  }
+    }),
+    rimraf(`${where}/node_modules/`)
+  ])
+  await arb.reify()
+  reifyOutput(arb)
 }
+
+module.exports = Object.assign(cmd, { completion, usage })