feat(maven): unlink and re-add Maven projects (#297)

As in IntelliJ IDEA, a root Maven project can be unlinked from the Maven tool window's context menu (Unlink Maven Projects, with confirmation) and linked again with the toolbar's Add Maven Projects (pick a pom.xml). Unlinked root POMs are stored in the project's Maven settings (unlinkedProjects). ide-host computes the unlinked roots and their modules once with ide-build and applies the same exclusion to the build model, Maven sync, project source roots, detected run configurations and the Java language server import (java.import.exclusions). The project's files stay visible in the Project view as plain files.

Refs #271

src/platform/languageSettings.ts

@@ -21,7 +21,7 @@ export interface LanguagesValid {
     jdk: string;
     jdtlsJdk: string;
     jdtlsVmArgs: string;
-    maven: { home: string; userSettings: string; localRepository: string };
+    maven: { home: string; userSettings: string; localRepository: string; unlinkedProjects: string[] };
   };
 }
 
@@ -54,7 +54,12 @@ export const DEFAULT_LANGUAGES: LanguagesValid = {
   rust: { toolchain: "", stdlib: "", checkOnSave: true, checkCommand: "check", rustfmtArgs: "" },
   go: { goroot: "", gopath: "" },
   typescript: { version: "bundled" },
-  java: { jdk: "", jdtlsJdk: "", jdtlsVmArgs: "", maven: { home: "", userSettings: "", localRepository: "" } },
+  java: {
+    jdk: "",
+    jdtlsJdk: "",
+    jdtlsVmArgs: "",
+    maven: { home: "", userSettings: "", localRepository: "", unlinkedProjects: [] },
+  },
 };
 
 export const DEFAULT_PROJECT_STRUCTURE: ProjectStructureValid = {
@@ -136,6 +141,7 @@ export function validateLanguages(raw: unknown): LanguagesValid {
         home: text(maven.home, d.java.maven.home),
         userSettings: text(maven.userSettings, d.java.maven.userSettings),
         localRepository: text(maven.localRepository, d.java.maven.localRepository),
+        unlinkedProjects: folders(maven.unlinkedProjects),
       },
     },
   };

src/platform/locales/text/zh.json

@@ -1,4 +1,9 @@
 {
+  "Add Maven Projects": "添加 Maven 项目",
+  "Unlink Maven Projects": "取消链接 Maven 项目",
+  "Unlink Maven projects?": "取消链接 Maven 项目？",
+  "Remove this project and its modules from Maven? Files will remain in the Project view.": "从 Maven 中移除此项目及其模块？文件将保留在项目视图中。",
+  "Unlink": "取消链接",
   "(does not exist)": "（不存在）",
   ", e.g.": "，例如",
   ", then press Tab.": "，然后按 Tab。",