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// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
package com.intellij.openapi.vcs.impl
import com.intellij.ProjectTopics
import com.intellij.openapi.application.ApplicationManager
import com.intellij.openapi.application.runReadAction
import com.intellij.openapi.components.service
import com.intellij.openapi.extensions.ExtensionNotApplicableException
import com.intellij.openapi.module.ModuleManager
import com.intellij.openapi.project.Project
import com.intellij.openapi.project.rootManager
import com.intellij.openapi.roots.AdditionalLibraryRootsListener
import com.intellij.openapi.roots.ModuleRootEvent
import com.intellij.openapi.roots.ModuleRootListener
import com.intellij.openapi.startup.StartupActivity
import com.intellij.openapi.vcs.AbstractVcs
import com.intellij.openapi.vcs.VcsDirectoryMapping
import com.intellij.openapi.vfs.VirtualFile
import com.intellij.openapi.vfs.VirtualFileManager
import com.intellij.util.Alarm
import com.intellij.util.ui.update.MergingUpdateQueue
import com.intellij.util.ui.update.Update
import com.intellij.workspaceModel.ide.WorkspaceModelChangeListener
import com.intellij.workspaceModel.ide.WorkspaceModelTopics
import com.intellij.workspaceModel.storage.EntityChange
import com.intellij.workspaceModel.storage.VersionedStorageChange
import com.intellij.workspaceModel.storage.bridgeEntities.ContentRootEntity
import com.intellij.workspaceModel.storage.url.VirtualFileUrl
internal class ModuleVcsDetector(private val project: Project) {
private val vcsManager by lazy(LazyThreadSafetyMode.NONE) { ProjectLevelVcsManagerImpl.getInstanceImpl(project) }
private val queue = MergingUpdateQueue("ModuleVcsDetector", 1000, true, null, project, null, Alarm.ThreadToUse.POOLED_THREAD).also {
it.setRestartTimerOnAdd(true)
}
private val dirtyContentRoots: MutableSet<VirtualFile> = mutableSetOf()
private fun startDetection() {
val busConnection = project.messageBus.connect()
WorkspaceModelTopics.getInstance(project).subscribeAfterModuleLoading(busConnection, MyWorkspaceModelChangeListener())
if (vcsManager.needAutodetectMappings()) {
val initialDetectionListener = InitialMappingsDetectionListener()
busConnection.subscribe(ProjectTopics.PROJECT_ROOTS, initialDetectionListener)
busConnection.subscribe(AdditionalLibraryRootsListener.TOPIC, initialDetectionListener)
queue.queue(InitialFullScan())
}
}
private fun autoDetectVcsMappings(tryMapPieces: Boolean) {
if (vcsManager.haveDefaultMapping() != null) return
val usedVcses = mutableSetOf<AbstractVcs?>()
val detectedRoots = mutableSetOf<Pair<VirtualFile, AbstractVcs>>()
val contentRoots = runReadAction {
ModuleManager.getInstance(project).modules.asSequence()
.flatMap { it.rootManager.contentRoots.asSequence() }
.filter { it.isDirectory }.distinct().toList()
}
for (root in contentRoots) {
val moduleVcs = vcsManager.findVersioningVcs(root)
if (moduleVcs != null) {
detectedRoots.add(Pair(root, moduleVcs))
}
usedVcses.add(moduleVcs) // put 'null' for unmapped module
}
val commonVcs = usedVcses.singleOrNull()
if (commonVcs != null) {
// Remove existing mappings that will duplicate added <Project> mapping.
val rootPaths = contentRoots.map { it.path }.toSet()
val additionalMappings = vcsManager.directoryMappings.filter { it.directory !in rootPaths }
vcsManager.setAutoDirectoryMappings(additionalMappings + VcsDirectoryMapping.createDefault(commonVcs.name))
}
else if (tryMapPieces) {
val newMappings = detectedRoots.map { (root, vcs) -> VcsDirectoryMapping(root.path, vcs.name) }
vcsManager.setAutoDirectoryMappings(vcsManager.directoryMappings + newMappings)
}
}
private fun autoDetectModuleVcsMapping(contentRoots: List<VirtualFile>) {
if (vcsManager.haveDefaultMapping() != null) return
val newMappings = mutableListOf<VcsDirectoryMapping>()
contentRoots
.filter { it.isDirectory }
.forEach { file ->
val vcs = vcsManager.findVersioningVcs(file)
if (vcs != null && vcs !== vcsManager.getVcsFor(file)) {
newMappings.add(VcsDirectoryMapping(file.path, vcs.name))
}
}
if (newMappings.isNotEmpty()) {
vcsManager.setAutoDirectoryMappings(vcsManager.directoryMappings + newMappings)
}
}
private inner class InitialFullScan : Update("initial scan") {
override fun run() {
autoDetectVcsMappings(true)
}
override fun canEat(update: Update?): Boolean = update is DelayedFullScan
}
private inner class DelayedFullScan : Update("delayed scan") {
override fun run() {
autoDetectVcsMappings(false)
}
}
private inner class ContentRootsScan : Update("modules scan") {
override fun run() {
val contentRoots: List<VirtualFile>
synchronized(dirtyContentRoots) {
contentRoots = dirtyContentRoots.toList()
dirtyContentRoots.clear()
}
autoDetectModuleVcsMapping(contentRoots)
}
}
private inner class MyWorkspaceModelChangeListener : WorkspaceModelChangeListener {
override fun changed(event: VersionedStorageChange) {
val removedUrls = mutableSetOf<VirtualFileUrl>()
val addedUrls = mutableSetOf<VirtualFileUrl>()
val changes = event.getChanges(ContentRootEntity::class.java)
for (change in changes) {
when (change) {
is EntityChange.Removed<ContentRootEntity> -> {
removedUrls.add(change.entity.url)
}
is EntityChange.Added<ContentRootEntity> -> {
addedUrls.add(change.entity.url)
}
is EntityChange.Replaced<ContentRootEntity> -> {
if (change.oldEntity.url != change.newEntity.url) {
removedUrls.add(change.oldEntity.url)
addedUrls.add(change.newEntity.url)
}
}
}
}
val fileManager = VirtualFileManager.getInstance()
val removed = removedUrls
.filter { !addedUrls.contains(it) } // do not process 'modifications' of any kind
.mapNotNull { fileManager.findFileByUrl(it.url) }
.filter { it.isDirectory }
val added = addedUrls
.filter { !removedUrls.contains(it) } // do not process 'modifications' of any kind
.mapNotNull { fileManager.findFileByUrl(it.url) }
.filter { it.isDirectory }
if (added.isNotEmpty() && vcsManager.haveDefaultMapping() == null) {
synchronized(dirtyContentRoots) {
dirtyContentRoots.addAll(added)
dirtyContentRoots.removeAll(removed)
}
queue.queue(ContentRootsScan())
}
if (removed.isNotEmpty()) {
val remotedPaths = removed.map { it.path }.toSet()
val removedMappings = vcsManager.directoryMappings.filter { it.directory in remotedPaths }
removedMappings.forEach { mapping -> vcsManager.removeDirectoryMapping(mapping) }
}
}
}
private inner class InitialMappingsDetectionListener : ModuleRootListener, AdditionalLibraryRootsListener {
override fun rootsChanged(event: ModuleRootEvent) {
scheduleRescan()
}
override fun libraryRootsChanged(presentableLibraryName: String?,
oldRoots: MutableCollection<out VirtualFile>,
newRoots: MutableCollection<out VirtualFile>,
libraryNameForDebug: String) {
scheduleRescan()
}
private fun scheduleRescan() {
if (vcsManager.needAutodetectMappings()) {
queue.queue(DelayedFullScan())
}
}
}
internal class MyPostStartUpActivity : StartupActivity.DumbAware {
init {
if (ApplicationManager.getApplication().isUnitTestMode) {
throw ExtensionNotApplicableException.create()
}
}
override fun runActivity(project: Project) {
project.service<ModuleVcsDetector>().startDetection()
}
}
}
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