feat: support load code from local file for issue 59 (LeetCode-OpenSource#149)

Author: poppinlp

package-lock.json

@@ -267,6 +267,7 @@
     },
     "devDependencies": {
         "@types/fs-extra": "5.0.0",
+        "@types/lodash.kebabcase": "^4.1.5",
         "@types/mocha": "^2.2.42",
         "@types/node": "^7.0.43",
         "@types/require-from-string": "^1.2.0",
@@ -277,6 +278,7 @@
     "dependencies": {
         "fs-extra": "^6.0.1",
         "leetcode-cli": "2.6.1",
+        "lodash.kebabcase": "^4.1.1",
         "require-from-string": "^2.0.2"
     }
 }

package.json

@@ -65,16 +65,10 @@ async function showProblemInternal(node: IProblem): Promise<void> {
 
         outDir = path.join(outDir, relativePath);
         await fse.ensureDir(outDir);
-        const result: string = await leetCodeExecutor.showProblem(node.id, language, outDir);
-        const reg: RegExp = /\* Source Code:\s*(.*)/;
-        const match: RegExpMatchArray | null = result.match(reg);
-        if (match && match.length >= 2) {
-            const filePath: string = wsl.useWsl() ? await wsl.toWinPath(match[1].trim()) : match[1].trim();
 
-            await vscode.window.showTextDocument(vscode.Uri.file(filePath), { preview: false });
-        } else {
-            throw new Error("Failed to fetch the problem information.");
-        }
+        const originFilePath: string = await leetCodeExecutor.showProblem(node, language, outDir);
+        const filePath: string = wsl.useWsl() ? await wsl.toWinPath(originFilePath) : originFilePath;
+        await vscode.window.showTextDocument(vscode.Uri.file(filePath), { preview: false });
 
         if (!defaultLanguage && leetCodeConfig.get<boolean>("showSetDefaultLanguageHint")) {
             const choice: vscode.MessageItem | undefined = await vscode.window.showInformationMessage(

src/commands/show.ts

@@ -6,8 +6,9 @@ import * as fse from "fs-extra";
 import * as path from "path";
 import * as requireFromString from "require-from-string";
 import * as vscode from "vscode";
-import { Endpoint } from "./shared";
+import { Endpoint, IProblem } from "./shared";
 import { executeCommand, executeCommandWithProgress } from "./utils/cpUtils";
+import { genFileName } from "./utils/problemUtils";
 import { DialogOptions, openUrl } from "./utils/uiUtils";
 import * as wsl from "./utils/wslUtils";
 
@@ -74,8 +75,16 @@ class LeetCodeExecutor {
         );
     }
 
-    public async showProblem(id: string, language: string, outDir: string): Promise<string> {
-        return await this.executeCommandWithProgressEx("Fetching problem data...", "node", [await this.getLeetCodeBinaryPath(), "show", id, "-gx", "-l", language, "-o", `"${outDir}"`]);
+    public async showProblem(node: IProblem, language: string, outDir: string): Promise<string> {
+        const fileName: string = genFileName(node, language);
+        const filePath: string = path.join(outDir, fileName);
+
+        if (!await fse.pathExists(filePath)) {
+            const codeTemplate: string = await this.executeCommandWithProgressEx("Fetching problem data...", "node", [await this.getLeetCodeBinaryPath(), "show", node.id, "-cx", "-l", language]);
+            await fse.writeFile(filePath, codeTemplate);
+        }
+
+        return filePath;
     }
 
     public async listSessions(): Promise<string> {

src/leetCodeExecutor.ts

@@ -29,6 +29,23 @@ export const languages: string[] = [
     "swift",
 ];
 
+export const langExt: Map<string, string> = new Map([
+    ["bash", "sh"],
+    ["c", "c"],
+    ["cpp", "cpp"],
+    ["csharp", "cs"],
+    ["golang", "go"],
+    ["java", "java"],
+    ["javascript", "js"],
+    ["kotlin", "kt"],
+    ["mysql", "sql"],
+    ["python", "py"],
+    ["python3", "py"],
+    ["ruby", "rb"],
+    ["scala", "scala"],
+    ["swift", "swift"],
+]);
+
 export enum ProblemState {
     AC = 1,
     NotAC = 2,

src/shared.ts

@@ -6,7 +6,7 @@ export function isWindows(): boolean {
 }
 
 export function usingCmd(): boolean {
-    const comSpec: string = process.env.ComSpec;
+    const comSpec: string | undefined = process.env.ComSpec;
     // 'cmd.exe' is used as a fallback if process.env.ComSpec is unavailable.
     if (!comSpec) {
         return true;

src/utils/osUtils.ts

@@ -0,0 +1,16 @@
+import kebabCase = require("lodash.kebabcase");
+import { IProblem, langExt } from "../shared";
+
+export function genFileExt(language: string): string {
+    const ext: string | undefined = langExt.get(language);
+    if (!ext) {
+        throw new Error(`The language "${language}" is not supported.`);
+    }
+    return ext;
+}
+
+export function genFileName(node: IProblem, language: string): string {
+    const slug: string = kebabCase(node.name);
+    const ext: string = genFileExt(language);
+    return `${node.id}.${slug}.${ext}`;
+}