Add capability to select projects to be imported

package.json

@@ -72,6 +72,16 @@
       "^pom\\.xml$",
       ".*\\.gradle(\\.kts)?$"
     ],
+    "javaBuildTools": [
+      {
+        "displayName": "Maven",
+        "buildFileNames": ["pom.xml"]
+      },
+      {
+        "displayName": "Gradle",
+        "buildFileNames": ["build.gradle", "settings.gradle", "build.gradle.kts", "settings.gradle.kts"]
+      }
+    ],
     "semanticTokenTypes": [
       {
         "id": "annotation",
@@ -346,6 +356,21 @@
       "title": "Project Import/Update",
       "order": 20,
       "properties": {
+        "java.import.projectSelection": {
+          "type": "string",
+          "enum": [
+            "manual",
+            "automatic"
+          ],
+          "enumDescriptions": [
+            "Manually select the build configuration files.",
+            "Let extension automatically scan and select the build configuration files."
+          ],
+          "default": "automatic",
+          "markdownDescription": "[Experimental] Specifies how to select build configuration files to import. \nNote: Currently, `Gradle` projects cannot be partially imported.",
+          "scope": "window",
+          "order": 10
+        },
         "java.configuration.updateBuildConfiguration": {
           "type": [
             "string"
@@ -358,7 +383,7 @@
           "default": "interactive",
           "description": "Specifies how modifications on build files update the Java classpath/configuration",
           "scope": "window",
-          "order": 10
+          "order": 20
         },
         "java.import.exclusions": {
           "type": "array",

schemas/package.schema.json

@@ -21,6 +21,26 @@
 						"type": "string",
 						"description": "Regular expressions for specifying build file"
 					}
+				},
+				"javaBuildTools": {
+					"type": "array",
+					"description": "Information about the cared build files. Will be used when 'java.import.projectSelection' is 'manual'.",
+					"items": {
+						"type": "object",
+						"properties": {
+							"displayName": {
+								"description": "The display name of the build file type.",
+								"type": "string"
+							},
+							"buildFileNames": {
+								"description": "The build file names that supported by the build tool.",
+								"type": "array",
+								"items": {
+									"type": "string"
+								}
+							}
+						}
+					}
 				}
 			}
 		}

src/apiManager.ts

@@ -10,6 +10,7 @@ import { Emitter } from "vscode-languageclient";
 import { ServerMode } from "./settings";
 import { registerHoverCommand } from "./hoverAction";
 import { onDidRequestEnd, onWillRequestStart } from "./TracingLanguageClient";
+import { getJavaConfiguration } from "./utils";
 
 class ApiManager {
 
@@ -22,6 +23,11 @@ class ApiManager {
     private serverReadyPromiseResolve: (result: boolean) => void;
 
     public initialize(requirements: RequirementsData, serverMode: ServerMode): void {
+        // if it's manual import mode, set the server mode to lightwight, so that the
+        // project explorer won't spinning until import project is triggered.
+        if (getJavaConfiguration().get<string>("import.projectSelection") === "manual") {
+            serverMode = ServerMode.lightWeight;
+        }
         const getDocumentSymbols: GetDocumentSymbolsCommand = getDocumentSymbolsProvider();
         const goToDefinition: GoToDefinitionCommand = goToDefinitionProvider();
 

src/buildFilesSelector.ts

@@ -0,0 +1,258 @@
+import { ExtensionContext, MessageItem, QuickPickItem, QuickPickItemKind, Uri, WorkspaceFolder, extensions, window, workspace } from "vscode";
+import { convertToGlob, getExclusionGlob as getExclusionGlobPattern, getInclusionPatternsFromNegatedExclusion } from "./utils";
+import * as path from "path";
+
+export const PICKED_BUILD_FILES = "java.pickedBuildFiles";
+export class BuildFileSelector {
+	private buildTypes: IBuildTool[] = [];
+	private context: ExtensionContext;
+	private exclusionGlobPattern: string;
+	// cached glob pattern for build files.
+	private searchPattern: string;
+	// cached glob pattern for build files that are explicitly
+	// included from the setting: "java.import.exclusions" (negated exclusion).
+	private negatedExclusionSearchPattern: string | undefined;
+
+	constructor(context: ExtensionContext) {
+		this.context = context;
+		// TODO: should we introduce the exclusion globs into the contribution point?
+		this.exclusionGlobPattern = getExclusionGlobPattern(["**/target/**", "**/bin/**", "**/build/**"]);
+		for (const extension of extensions.all) {
+			const javaBuildTools: IBuildTool[] = extension.packageJSON.contributes?.javaBuildTools;
+			if (!Array.isArray(javaBuildTools)) {
+				continue;
+			}
+
+			for (const buildType of javaBuildTools) {
+				if (!this.isValidBuildTypeConfiguration(buildType)) {
+					continue;
+				}
+
+				this.buildTypes.push(buildType);
+			}
+		}
+		this.searchPattern = `**/{${this.buildTypes.map(buildType => buildType.buildFileNames.join(","))}}`;
+		const inclusionFolderPatterns: string[] = getInclusionPatternsFromNegatedExclusion();
+		if (inclusionFolderPatterns.length > 0) {
+			const buildFileNames: string[] = [];
+			this.buildTypes.forEach(buildType => buildFileNames.push(...buildType.buildFileNames));
+			this.negatedExclusionSearchPattern = convertToGlob(buildFileNames, inclusionFolderPatterns);
+		}
+	}
+
+	/**
+	 * @returns `true` if there are build files in the workspace, `false` otherwise.
+	 */
+	public async hasBuildFiles(): Promise<boolean> {
+		if (this.buildTypes.length === 0) {
+			return false;
+		}
+
+		let uris: Uri[];
+		if (this.negatedExclusionSearchPattern) {
+			uris = await workspace.findFiles(this.negatedExclusionSearchPattern, null /* force not use default exclusion */, 1);
+			if (uris.length > 0) {
+				return true;
+			}
+		}
+		uris = await workspace.findFiles(this.searchPattern, this.exclusionGlobPattern, 1);
+		if (uris.length > 0) {
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	 * Get the uri strings for the build files that the user selected.
+	 * @returns An array of uri string for the build files that the user selected.
+	 * An empty array means user canceled the selection.
+	 */
+	public async getBuildFiles(): Promise<string[] | undefined> {
+		const cache = this.context.workspaceState.get<string[]>(PICKED_BUILD_FILES);
+		if (cache !== undefined) {
+			return cache;
+		}
+
+		const choice = await this.chooseBuildFilePickers();
+		const pickedUris = await this.eliminateBuildToolConflict(choice);
+		if (pickedUris.length > 0) {
+			this.context.workspaceState.update(PICKED_BUILD_FILES, pickedUris);
+		}
+		return pickedUris;
+	}
+
+	private isValidBuildTypeConfiguration(buildType: IBuildTool): boolean {
+		return !!buildType.displayName && !!buildType.buildFileNames;
+	}
+
+	private async chooseBuildFilePickers(): Promise<IBuildFilePicker[]> {
+		return window.showQuickPick(this.getBuildFilePickers(), {
+			placeHolder: "Note: Currently only Maven projects can be partially imported.",
+			title: "Select build files to import",
+			ignoreFocusOut: true,
+			canPickMany: true,
+			matchOnDescription: true,
+			matchOnDetail: true,
+		});
+	}
+
+	/**
+	 * Get pickers for all build files in the workspace.
+	 */
+	private async getBuildFilePickers(): Promise<IBuildFilePicker[]> {
+		const uris: Uri[] = await workspace.findFiles(this.searchPattern, this.exclusionGlobPattern);
+		if (this.negatedExclusionSearchPattern) {
+			uris.push(...await workspace.findFiles(this.negatedExclusionSearchPattern, null /* force not use default exclusion */));
+		}
+
+		// group build files by build tool and then sort them by build tool name.
+		const groupByBuildTool = new Map<IBuildTool, Uri[]>();
+		for (const uri of uris) {
+			const buildType = this.buildTypes.find(buildType => buildType.buildFileNames.includes(path.basename(uri.fsPath)));
+			if (!buildType) {
+				continue;
+			}
+			if (!groupByBuildTool.has(buildType)) {
+				groupByBuildTool.set(buildType, []);
+			}
+			groupByBuildTool.get(buildType)?.push(uri);
+		}
+
+		const buildTypeArray = Array.from(groupByBuildTool.keys());
+		buildTypeArray.sort((a, b) => a.displayName.localeCompare(b.displayName));
+		const addedFolders: Map<string, IBuildFilePicker> = new Map<string, IBuildFilePicker>();
+		for (const buildType of buildTypeArray) {
+			const uris = groupByBuildTool.get(buildType);
+			for (const uri of uris) {
+				const containingFolder = path.dirname(uri.fsPath);
+				if (addedFolders.has(containingFolder)) {
+					const picker = addedFolders.get(containingFolder);
+					if (!picker.buildTypeAndUri.has(buildType)) {
+						picker.detail += `, ./${workspace.asRelativePath(uri)}`;
+						picker.description += `, ${buildType.displayName}`;
+						picker.buildTypeAndUri.set(buildType, uri);
+					}
+				} else {
+					addedFolders.set(containingFolder, {
+						label: path.basename(containingFolder),
+						detail: `./${workspace.asRelativePath(uri)}`,
+						description: buildType.displayName,
+						buildTypeAndUri: new Map<IBuildTool, Uri>([[buildType, uri]]),
+						picked: true,
+					});
+				}
+			}
+		}
+
+		const pickers: IBuildFilePicker[] = Array.from(addedFolders.values());
+		return this.addSeparator(pickers);
+	}
+
+	/**
+	 * Add a separator pickers between pickers that belong to different workspace folders.
+	 */
+	private addSeparator(pickers: IBuildFilePicker[]): IBuildFilePicker[] {
+		// group pickers by their containing workspace folder
+		const workspaceFolders = new Map<WorkspaceFolder, IBuildFilePicker[]>();
+		for (const picker of pickers) {
+			const folder = workspace.getWorkspaceFolder(picker.buildTypeAndUri.values().next().value);
+			if (!folder) {
+				continue;
+			}
+			if (!workspaceFolders.has(folder)) {
+				workspaceFolders.set(folder, []);
+			}
+			workspaceFolders.get(folder)?.push(picker);
+		}
+
+		const newPickers: IBuildFilePicker[] = [];
+		const folderArray = Array.from(workspaceFolders.keys());
+		folderArray.sort((a, b) => a.name.localeCompare(b.name));
+		for (const folder of folderArray) {
+			const pickersInFolder = workspaceFolders.get(folder);
+			newPickers.push({
+				label: folder.name,
+				kind: QuickPickItemKind.Separator,
+				buildTypeAndUri: null
+			});
+			newPickers.push(...this.sortPickers(pickersInFolder));
+		}
+		return newPickers;
+	}
+
+	private sortPickers(pickers: IBuildFilePicker[]): IBuildFilePicker[] {
+		return pickers.sort((a, b) => {
+			const pathA = path.dirname(a.buildTypeAndUri.values().next().value.fsPath);
+			const pathB = path.dirname(b.buildTypeAndUri.values().next().value.fsPath);
+			return pathA.localeCompare(pathB);
+		});
+	}
+
+	/**
+	 * Ask user to choose a build tool when there are multiple build tools in the same folder.
+	 */
+	private async eliminateBuildToolConflict(choice?: IBuildFilePicker[]): Promise<string[]> {
+		if (!choice) {
+			return [];
+		}
+		const conflictBuildTypeAndUris = new Map<IBuildTool, Uri[]>();
+		const result: string[] = [];
+		for (const picker of choice) {
+			if (picker.buildTypeAndUri.size > 1) {
+				for (const [buildType, uri] of picker.buildTypeAndUri) {
+					if (!conflictBuildTypeAndUris.has(buildType)) {
+						conflictBuildTypeAndUris.set(buildType, []);
+					}
+					conflictBuildTypeAndUris.get(buildType)?.push(uri);
+				}
+			} else {
+				result.push(picker.buildTypeAndUri.values().next().value.toString());
+			}
+		}
+
+		if (conflictBuildTypeAndUris.size > 0) {
+			const conflictItems: IConflictItem[] = [];
+			for (const buildType of conflictBuildTypeAndUris.keys()) {
+				conflictItems.push({
+					title: buildType.displayName,
+					uris: conflictBuildTypeAndUris.get(buildType),
+				});
+			}
+			conflictItems.sort((a, b) => a.title.localeCompare(b.title));
+			conflictItems.push({
+				title: "Skip",
+				isCloseAffordance: true,
+			});
+
+			const choice = await window.showInformationMessage<IConflictItem>(
+				"Which build tool would you like to use for the workspace?",
+				{
+					modal: true,
+				},
+				...conflictItems
+			);
+
+			if (choice?.title !== "Skip" && choice?.uris) {
+				result.push(...choice.uris.map(uri => uri.toString()));
+			}
+		}
+		return result;
+	}
+}
+
+interface IBuildTool {
+	displayName: string;
+	buildFileNames: string[];
+}
+
+interface IConflictItem extends MessageItem {
+	uris?: Uri[];
+}
+
+interface IBuildFilePicker extends QuickPickItem {
+	buildTypeAndUri: Map<IBuildTool, Uri>;
+}
+
+export function cleanupProjectPickerCache(context: ExtensionContext) {
+	context.workspaceState.update(PICKED_BUILD_FILES, undefined);
+}