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var util = require('util')
var path = require('path')
var validate = require('aproba')
var without = require('lodash.without')
var asyncMap = require('slide').asyncMap
var chain = require('slide').chain
var npa = require('npm-package-arg')
var log = require('npmlog')
var npm = require('./npm.js')
var Installer = require('./install.js').Installer
var findRequirement = require('./install/deps.js').findRequirement
var earliestInstallable = require('./install/deps.js').earliestInstallable
var checkPermissions = require('./install/check-permissions.js')
var decomposeActions = require('./install/decompose-actions.js')
var loadExtraneous = require('./install/deps.js').loadExtraneous
var computeMetadata = require('./install/deps.js').computeMetadata
var sortActions = require('./install/diff-trees.js').sortActions
var moduleName = require('./utils/module-name.js')
var packageId = require('./utils/package-id.js')
var childPath = require('./utils/child-path.js')
var usage = require('./utils/usage')
var getRequested = require('./install/get-requested.js')
module.exports = dedupe
module.exports.Deduper = Deduper
dedupe.usage = usage(
'dedupe',
'npm dedupe'
)
function dedupe (args, cb) {
validate('AF', arguments)
// the /path/to/node_modules/..
var where = path.resolve(npm.dir, '..')
var dryrun = false
if (npm.command.match(/^find/)) dryrun = true
if (npm.config.get('dry-run')) dryrun = true
if (dryrun && !npm.config.get('json')) npm.config.set('parseable', true)
new Deduper(where, dryrun).run(cb)
}
function Deduper (where, dryrun) {
validate('SB', arguments)
Installer.call(this, where, dryrun, [])
this.noPackageJsonOk = true
this.topLevelLifecycles = false
}
util.inherits(Deduper, Installer)
Deduper.prototype.loadIdealTree = function (cb) {
validate('F', arguments)
log.silly('install', 'loadIdealTree')
var self = this
chain([
[this.newTracker(this.progress.loadIdealTree, 'cloneCurrentTree')],
[this, this.cloneCurrentTreeToIdealTree],
[this, this.finishTracker, 'cloneCurrentTree'],
[this.newTracker(this.progress.loadIdealTree, 'loadAllDepsIntoIdealTree', 10)],
[ function (next) {
loadExtraneous(self.idealTree, self.progress.loadAllDepsIntoIdealTree, next)
} ],
[this, this.finishTracker, 'loadAllDepsIntoIdealTree'],
[this, andComputeMetadata(this.idealTree)]
], cb)
}
function andComputeMetadata (tree) {
return function (next) {
next(null, computeMetadata(tree))
}
}
Deduper.prototype.generateActionsToTake = function (cb) {
validate('F', arguments)
log.silly('dedupe', 'generateActionsToTake')
chain([
[this.newTracker(log, 'hoist', 1)],
[hoistChildren, this.idealTree, this.differences],
[this, this.finishTracker, 'hoist'],
[this.newTracker(log, 'sort-actions', 1)],
[this, function (next) {
this.differences = sortActions(this.differences)
next()
}],
[this, this.finishTracker, 'sort-actions'],
[checkPermissions, this.differences],
[decomposeActions, this.differences, this.todo]
], cb)
}
function move (node, hoistTo, diff) {
node.parent.children = without(node.parent.children, node)
hoistTo.children.push(node)
node.fromPath = node.path
node.path = childPath(hoistTo.path, node)
node.parent = hoistTo
if (!diff.filter(function (action) { return action[0] === 'move' && action[1] === node }).length) {
diff.push(['move', node])
}
}
function moveRemainingChildren (node, diff) {
node.children.forEach(function (child) {
move(child, node, diff)
moveRemainingChildren(child, diff)
})
}
function remove (child, diff, done) {
remove_(child, diff, {}, done)
}
function remove_ (child, diff, seen, done) {
if (seen[child.path]) return done()
seen[child.path] = true
diff.push(['remove', child])
child.parent.children = without(child.parent.children, child)
asyncMap(child.children, function (child, next) {
remove_(child, diff, seen, next)
}, done)
}
function hoistChildren (tree, diff, next) {
hoistChildren_(tree, diff, {}, next)
}
function hoistChildren_ (tree, diff, seen, next) {
validate('OAOF', arguments)
if (seen[tree.path]) return next()
seen[tree.path] = true
asyncMap(tree.children, function (child, done) {
if (!tree.parent) return hoistChildren_(child, diff, seen, done)
var better = findRequirement(tree.parent, moduleName(child), getRequested(child) || npa(packageId(child)))
if (better) {
return chain([
[remove, child, diff],
[andComputeMetadata(tree)]
], done)
}
var hoistTo = earliestInstallable(tree, tree.parent, child.package)
if (hoistTo) {
move(child, hoistTo, diff)
chain([
[andComputeMetadata(hoistTo)],
[hoistChildren_, child, diff, seen],
[ function (next) {
moveRemainingChildren(child, diff)
next()
} ]
], done)
} else {
done()
}
}, next)
}
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