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website/node_modules/npm/lib/install/action/remove.js

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+'use strict'
+var path = require('path')
+var fs = require('graceful-fs')
+var rimraf = require('rimraf')
+var asyncMap = require('slide').asyncMap
+var mkdirp = require('mkdirp')
+var npm = require('../../npm.js')
+var andIgnoreErrors = require('../and-ignore-errors.js')
+var move = require('../../utils/move.js')
+var isInside = require('path-is-inside')
+var vacuum = require('fs-vacuum')
+
+// This is weird because we want to remove the module but not it's node_modules folder
+// allowing for this allows us to not worry about the order of operations
+module.exports = function (staging, pkg, log, next) {
+  log.silly('remove', pkg.path)
+  if (pkg.target) {
+    removeLink(pkg, next)
+  } else {
+    removeDir(pkg, log, next)
+  }
+}
+
+function removeLink (pkg, next) {
+  var base = isInside(pkg.path, npm.prefix) ? npm.prefix : pkg.path
+  rimraf(pkg.path, (err) => {
+    if (err) return next(err)
+    vacuum(pkg.path, {base: base}, next)
+  })
+}
+
+function removeDir (pkg, log, next) {
+  var modpath = path.join(path.dirname(pkg.path), '.' + path.basename(pkg.path) + '.MODULES')
+
+  move(path.join(pkg.path, 'node_modules'), modpath).then(unbuildPackage, unbuildPackage)
+
+  function unbuildPackage (moveEr) {
+    rimraf(pkg.path, moveEr ? andRemoveEmptyParents(pkg.path) : moveModulesBack)
+  }
+
+  function andRemoveEmptyParents (path) {
+    return function (er) {
+      if (er) return next(er)
+      removeEmptyParents(pkg.path)
+    }
+  }
+
+  function moveModulesBack () {
+    fs.readdir(modpath, makeTarget)
+  }
+
+  function makeTarget (readdirEr, files) {
+    if (readdirEr) return cleanup()
+    if (!files.length) return cleanup()
+    mkdirp(path.join(pkg.path, 'node_modules'), function (mkdirEr) { moveModules(mkdirEr, files) })
+  }
+
+  function moveModules (mkdirEr, files) {
+    if (mkdirEr) return next(mkdirEr)
+    asyncMap(files, function (file, done) {
+      var from = path.join(modpath, file)
+      var to = path.join(pkg.path, 'node_modules', file)
+      // we ignore errors here, because they can legitimately happen, for instance,
+      // bundled modules will be in both node_modules folders
+      move(from, to).then(andIgnoreErrors(done), andIgnoreErrors(done))
+    }, cleanup)
+  }
+
+  function cleanup () {
+    rimraf(modpath, afterCleanup)
+  }
+
+  function afterCleanup (rimrafEr) {
+    if (rimrafEr) log.warn('remove', rimrafEr)
+    removeEmptyParents(path.resolve(pkg.path, '..'))
+  }
+
+  function removeEmptyParents (pkgdir) {
+    fs.rmdir(pkgdir, function (er) {
+      // FIXME: Make sure windows does what we want here
+      if (er && er.code !== 'ENOENT') return next()
+      removeEmptyParents(path.resolve(pkgdir, '..'))
+    })
+  }
+}