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The only code using the Installer class now is in lib/outdated.js, which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, 13 insertions, 62 deletions

diff --git a/lib/prune.js b/lib/prune.js
index 62c9a9225..6e1cd9318 100644
--- a/lib/prune.js
+++ b/lib/prune.js
@@ -1,69 +1,20 @@
-// XXX replace this with @npmcli/arborist
 // prune extraneous packages.
+const util = require('util')
+const Arborist = require('@npmcli/arborist')
+const rimraf = util.promisify(require('rimraf'))
+const reifyOutput = require('./utils/reify-output.js')
+const usageUtil = require('./utils/usage.js')
 
-module.exports = prune
-module.exports.Pruner = Pruner
+const usage = usageUtil('prune',
+  'npm prune [[<@scope>/]<pkg>...] [--production]')
 
-prune.usage = 'npm prune [[<@scope>/]<pkg>...] [--production]'
+const completion = require('./utils/completion/installed-deep.js')
 
-var npm = require('./npm.js')
-var log = require('npmlog')
-var util = require('util')
-var moduleName = require('./utils/module-name.js')
-var Installer = require('./install.js').Installer
-var isExtraneous = require('./install/is-extraneous.js')
-var isOnlyDev = require('./install/is-only-dev.js')
-var removeDeps = require('./install/deps.js').removeDeps
-var loadExtraneous = require('./install/deps.js').loadExtraneous
-var chain = require('slide').chain
-var computeMetadata = require('./install/deps.js').computeMetadata
+const cmd = (args, cb) => prune(args).then(() => cb()).catch(cb)
 
-prune.completion = require('./utils/completion/installed-deep.js')
-
-function prune (args, cb) {
-  var dryrun = !!npm.config.get('dry-run')
-  new Pruner('.', dryrun, args).run(cb)
-}
-
-function Pruner (where, dryrun, args) {
-  Installer.call(this, where, dryrun, args)
-  this.autoPrune = true
-}
-util.inherits(Pruner, class {}) // Installer)
-
-Pruner.prototype.loadAllDepsIntoIdealTree = function (cb) {
-  log.silly('uninstall', 'loadAllDepsIntoIdealTree')
-
-  var cg = this.progress['loadIdealTree:loadAllDepsIntoIdealTree']
-  var steps = []
-
-  computeMetadata(this.idealTree)
-  var self = this
-  var excludeDev = npm.config.get('production') || /^prod(uction)?$/.test(npm.config.get('only'))
-  function shouldPrune (child) {
-    if (isExtraneous(child)) return true
-    if (!excludeDev) return false
-    return isOnlyDev(child)
-  }
-  function getModuleName (child) {
-    // wrapping because moduleName doesn't like extra args and we're called
-    // from map.
-    return moduleName(child)
-  }
-  function matchesArg (name) {
-    return self.args.length === 0 || self.args.indexOf(name) !== -1
-  }
-  function nameObj (name) {
-    return {name: name}
-  }
-  var toPrune = this.idealTree.children.filter(shouldPrune).map(getModuleName).filter(matchesArg).map(nameObj)
-
-  steps.push(
-    [removeDeps, toPrune, this.idealTree, null],
-    [loadExtraneous, this.idealTree, cg.newGroup('loadExtraneous')])
-  chain(steps, cb)
+const prune = async args => {
+  require('npmlog').warn('coming soon!')
+  throw new Error('not yet implemented')
 }
 
-Pruner.prototype.runPreinstallTopLevelLifecycles = function (cb) { cb() }
-Pruner.prototype.runPostinstallTopLevelLifecycles = function (cb) { cb() }
-Pruner.prototype.saveToDependencies = function (cb) { cb() }
+module.exports = Object.assign(cmd, { usage, completion })