add code action: add a dependency (#634)

* add code action: add a dependency

Signed-off-by: Yan Zhang <yanzh@microsoft.com>

* fix tslint

Signed-off-by: Yan Zhang <yanzh@microsoft.com>

src/codeAction/codeActionProvider.ts

@@ -0,0 +1,32 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+import * as vscode from "vscode";
+import { ElementNode, getCurrentNode, XmlTagName } from "../utils/lexerUtils";
+
+class CodeActionProvider implements vscode.CodeActionProvider {
+  public provideCodeActions(document: vscode.TextDocument, range: vscode.Range | vscode.Selection, _context: vscode.CodeActionContext, _token: vscode.CancellationToken): vscode.Command[] | undefined {
+    const documentText: string = document.getText();
+    const cursorOffset: number = document.offsetAt(range.start);
+    const currentNode: ElementNode | undefined = getCurrentNode(documentText, cursorOffset);
+    if (currentNode === undefined || currentNode.contentStart === undefined || currentNode.contentEnd === undefined) {
+      return undefined;
+    }
+
+    if (currentNode.tag === XmlTagName.Dependencies) {
+        const addDependencyCommand: vscode.Command = {
+            command: "maven.project.addDependency",
+            title: "Add a dependency from Maven Central Repository...",
+            arguments: [{
+                pomPath: document.uri.fsPath
+            }]
+        };
+        return [addDependencyCommand];
+    }
+
+    return undefined;
+  }
+
+}
+
+export const codeActionProvider: CodeActionProvider = new CodeActionProvider();

src/extension.ts

@@ -8,6 +8,7 @@ import * as vscode from "vscode";
 import { Progress, Uri } from "vscode";
 import { dispose as disposeTelemetryWrapper, initialize, instrumentOperation, sendInfo } from "vscode-extension-telemetry-wrapper";
 import { ArchetypeModule } from "./archetype/ArchetypeModule";
+import { codeActionProvider } from "./codeAction/codeActionProvider";
 import { completionProvider } from "./completion/completionProvider";
 import { definitionProvider } from "./definition/definitionProvider";
 import { initExpService } from "./experimentationService";
@@ -189,6 +190,8 @@ function registerPomFileAuthoringHelpers(context: vscode.ExtensionContext): void
     context.subscriptions.push(vscode.languages.registerDefinitionProvider([...pomSelector, {
         pattern: "**/*.pom"
     }], definitionProvider));
+    // add a dependency
+    context.subscriptions.push(vscode.languages.registerCodeActionsProvider(pomSelector, codeActionProvider));
 }
 
 async function mavenHistoryHandler(item: MavenProject | undefined): Promise<void> {