From 013d90ef4e6bd351990ebb499be4bba1b87589b5 Mon Sep 17 00:00:00 2001
From: "sheche@microsoft.com" <sheche@microsoft.com>
Date: Sat, 2 Mar 2019 13:02:23 +0800
Subject: [PATCH] feat: add a new command to support switching the default
 language

---
 CHANGELOG.md             |  4 ++++
 README.md                |  2 ++
 docs/README_zh-CN.md     |  2 ++
 package.json             |  6 ++++++
 src/commands/language.ts | 38 ++++++++++++++++++++++++++++++++++++++
 src/extension.ts         |  2 ++
 6 files changed, 54 insertions(+)
 create mode 100644 src/commands/language.ts

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 84d1ac9c..ef04d8cf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@ All notable changes to the "leetcode" extension will be documented in this file.
 
 Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
 
+## [0.12.0]
+## Added
+- Add new command `LeetCode: Switch Default Language` to support switching the default language [#115](https://github.com/jdneo/vscode-leetcode/issues/115)
+
 ## [0.11.0]
 ## Added
 - Add new setting: `leetcode.outputFolder` to customize the sub-directory to save the files generated by 'Show Problem' [#119](https://github.com/jdneo/vscode-leetcode/issues/119)
diff --git a/README.md b/README.md
index 0cfae21e..f18fd631 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,8 @@
 
   > Note: If no folder is opened in VS Code, the extension will save the problem files in **$HOME/.leetcode/**.
 
+  > You can switch the default language by triggering the command: `LeetCode: Switch Default Language`.
+
 ---
 
 ### Submit the Answer
diff --git a/docs/README_zh-CN.md b/docs/README_zh-CN.md
index ef1c6824..fa01450e 100644
--- a/docs/README_zh-CN.md
+++ b/docs/README_zh-CN.md
@@ -71,6 +71,8 @@
 
   > 注意：若当前 VS Code 没有已打开的文件夹，则生成的题目文件会存储于 **$HOME/.leetcode/** 目录下。
 
+  > 注意：你可以通过 `LeetCode: Switch Default Language` 命令变更答题时默认使用编程语言。
+
 ---
 
 ### 提交答案
diff --git a/package.json b/package.json
index 9f2db0af..0d5451c1 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,7 @@
         "onCommand:leetcode.searchProblem",
         "onCommand:leetcode.testSolution",
         "onCommand:leetcode.submitSolution",
+        "onCommand:leetcode.switchDefaultLanguage",
         "onView:leetCodeExplorer"
     ],
     "main": "./out/src/extension",
@@ -111,6 +112,11 @@
                 "command": "leetcode.submitSolution",
                 "title": "Submit to LeetCode",
                 "category": "LeetCode"
+            },
+            {
+                "command": "leetcode.switchDefaultLanguage",
+                "title": "Switch Default Language",
+                "category": "LeetCode"
             }
         ],
         "viewsContainers": {
diff --git a/src/commands/language.ts b/src/commands/language.ts
new file mode 100644
index 00000000..5728e0a9
--- /dev/null
+++ b/src/commands/language.ts
@@ -0,0 +1,38 @@
+// Copyright (c) jdneo. All rights reserved.
+// Licensed under the MIT license.
+
+import { QuickPickItem, window, workspace, WorkspaceConfiguration } from "vscode";
+import { languages } from "../shared";
+
+export async function switchDefaultLanguage(): Promise<void> {
+    const leetCodeConfig: WorkspaceConfiguration = workspace.getConfiguration("leetcode");
+    const defaultLanguage: string | undefined = leetCodeConfig.get<string>("defaultLanguage");
+    const languageItems: QuickPickItem[] = [];
+    for (const language of languages) {
+        languageItems.push({
+            label: language,
+            description: defaultLanguage === language ? "Currently used" : undefined,
+        });
+    }
+    // Put the default language at the top of the list
+    languageItems.sort((a: QuickPickItem, b: QuickPickItem) => {
+        if (a.description) {
+            return Number.MIN_SAFE_INTEGER;
+        } else if (b.description) {
+            return Number.MAX_SAFE_INTEGER;
+        }
+        return a.label.localeCompare(b.label);
+    });
+
+    const selectedItem: QuickPickItem | undefined = await window.showQuickPick(languageItems, {
+        placeHolder: "Please the default language",
+        ignoreFocusOut: true,
+    });
+
+    if (!selectedItem) {
+        return;
+    }
+
+    leetCodeConfig.update("defaultLanguage", selectedItem.label, true /* Global */);
+    window.showInformationMessage(`Successfully set the default language to ${selectedItem.label}`);
+}
diff --git a/src/extension.ts b/src/extension.ts
index 9685b3f4..aaf2ee4f 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -4,6 +4,7 @@
 import * as vscode from "vscode";
 import { codeLensProvider } from "./codeLensProvider";
 import * as cache from "./commands/cache";
+import { switchDefaultLanguage } from "./commands/language";
 import * as plugin from "./commands/plugin";
 import * as session from "./commands/session";
 import * as show from "./commands/show";
@@ -47,6 +48,7 @@ export async function activate(context: vscode.ExtensionContext): Promise<void>
         vscode.commands.registerCommand("leetcode.refreshExplorer", () => leetCodeTreeDataProvider.refresh()),
         vscode.commands.registerCommand("leetcode.testSolution", (uri?: vscode.Uri) => test.testSolution(uri)),
         vscode.commands.registerCommand("leetcode.submitSolution", (uri?: vscode.Uri) => submit.submitSolution(uri)),
+        vscode.commands.registerCommand("leetcode.switchDefaultLanguage", () => switchDefaultLanguage()),
     );
 
     await leetCodeExecutor.switchEndpoint(plugin.getLeetCodeEndpoint());