Added context menu command to create new worksheet

package.json

@@ -186,6 +186,11 @@
         "command": "metals.doctor-run",
         "category": "Metals",
         "title": "Run doctor"
+      },
+      {
+        "command": "metals.new-scala-file",
+        "category": "Metals",
+        "title": "New Scala File..."
       }
     ],
     "menus": {
@@ -229,6 +234,13 @@
           "command": "metals.doctor-run",
           "when": "metals:enabled"
         }
+      ],
+      "explorer/context": [
+        {
+          "command": "metals.new-scala-file",
+          "when": "metals:enabled && explorerResourceIsFolder",
+          "group": "navigation@4"
+        }
       ]
     },
     "breakpoints": [

src/MetalsFeatures.ts

@@ -14,6 +14,7 @@ export interface ExecuteClientCommandProvider {}
 export interface DoctorProvider {}
 export interface StatusBarProvider {}
 export interface OpenFilesOnRenameProvider {}
+export interface QuickPickProvider {}
 
 export class MetalsFeatures implements StaticFeature {
   treeViewProvider?: TreeViewProvider;
@@ -26,6 +27,7 @@ export class MetalsFeatures implements StaticFeature {
   doctorProvider?: DoctorProvider;
   statusBarProvider?: StatusBarProvider;
   openFilesOnRenameProvider?: OpenFilesOnRenameProvider;
+  quickPickProvider?: QuickPickProvider;
 
   fillInitializeParams(params: InitializeParams): void {
     if (!params.capabilities.experimental) {
@@ -42,6 +44,7 @@ export class MetalsFeatures implements StaticFeature {
     (params.capabilities.experimental as any).openFilesOnRenameProvider = true;
     (params.capabilities.experimental as any).doctorProvider = "html";
     (params.capabilities.experimental as any).statusBarProvider = "on";
+    (params.capabilities.experimental as any).quickPickProvider = true;
   }
   fillClientCapabilities(): void {}
   initialize(capabilities: ServerCapabilities): void {
@@ -58,6 +61,7 @@ export class MetalsFeatures implements StaticFeature {
         capabilities.experimental.openFilesOnRenameProvider;
       this.doctorProvider = capabilities.experimental.doctorProvider;
       this.statusBarProvider = capabilities.experimental.statusBarProvider;
+      this.quickPickProvider = capabilities.experimental.quickPickProvider;
     }
   }
 }

src/extension.ts

@@ -41,7 +41,8 @@ import {
   MetalsDidFocus,
   ExecuteClientCommand,
   MetalsInputBox,
-  MetalsWindowStateDidChange
+  MetalsWindowStateDidChange,
+  MetalsQuickPick
 } from "./protocol";
 import { LazyProgress } from "./lazy-progress";
 import * as fs from "fs";
@@ -508,6 +509,13 @@ function launchMetals(
       });
     });
 
+    registerCommand("metals.new-scala-file", async (directory: Uri) => {
+      return client.sendRequest(ExecuteCommandRequest.type, {
+        command: "new-scala-file",
+        arguments: [directory?.toString()]
+      });
+    });
+
     window.onDidChangeActiveTextEditor(editor => {
       if (editor && isSupportedLanguage(editor.document.languageId)) {
         client.sendNotification(
@@ -533,6 +541,18 @@ function launchMetals(
       });
     });
 
+    client.onRequest(MetalsQuickPick.type, (params, requestToken) => {
+      return window
+        .showQuickPick(params.items, params, requestToken)
+        .then(result => {
+          if (result === undefined) {
+            return { cancelled: true };
+          } else {
+            return { itemId: result.id };
+          }
+        });
+    });
+
     // Long running tasks such as "import project" trigger start a progress
     // bar with a "cancel" button.
     client.onRequest(MetalsSlowTask.type, (params, requestToken) => {

src/protocol.ts

@@ -59,6 +59,36 @@ export interface MetalsInputBoxResult {
   cancelled?: boolean;
 }
 
+export namespace MetalsQuickPick {
+  export const type = new RequestType<
+    MetalsQuickPickParams,
+    MetalsQuickPickResult,
+    void,
+    void
+  >("metals/quickPick");
+}
+
+export interface MetalsQuickPickParams {
+  items: MetalsQuickPickItem[];
+  matchOnDescription?: boolean;
+  matchOnDetail?: boolean;
+  placeHolder?: string;
+  ignoreFocusOut?: boolean;
+}
+
+export interface MetalsQuickPickResult {
+  itemId?: string;
+  cancelled?: boolean;
+}
+
+export interface MetalsQuickPickItem {
+  id: string;
+  label: string;
+  description?: string;
+  detail?: string;
+  alwaysShow?: boolean;
+}
+
 export namespace MetalsWindowStateDidChange {
   export const type = new NotificationType<
     MetalsWindowStateDidChangeParams,