Fix previewProblem command not work

Author: Yuelioi

src/commands/show.ts

@@ -23,24 +23,49 @@ import * as list from "./list";
 
 export async function previewProblem(input: IProblem | vscode.Uri, isSideMode: boolean = false): Promise<void> {
     let node: IProblem;
-    if (input instanceof vscode.Uri) {
-        const activeFilePath: string = input.fsPath;
-        const id: string = await getNodeIdFromFile(activeFilePath);
+     // I dont know why I use this command, it not work,maybe theproblem of "input"?
+    // 不知道为什么,当我直接使用这个命令,他并不会正常工作,也许input的问题
+
+    //if (input instanceof vscode.Uri) {
+    // const activeFilePath: string = input.fsPath;
+    // const id: string = await getNodeIdFromFile(activeFilePath);
+
+    let id = "";
+
+    // * We can read file throught editor.document not fs
+    // * 我们可以直接用自带API读取文件内容,从而跳过input判断
+    const editor = vscode.window.activeTextEditor;
+
+    if (editor) {
+        const fsPath = editor.document.fileName;
+        let fileContent = editor.document.getText();
+
+        const matchResults = fileContent.match(/@lc.+id=(.+?) /);
+        if (matchResults && matchResults.length === 2) {
+            id = matchResults[1];
+        }
+
+        // Try to get id from file name if getting from comments failed
         if (!id) {
-            vscode.window.showErrorMessage(`Failed to resolve the problem id from file: ${activeFilePath}.`);
-            return;
+            id = path.basename(fsPath).split(".")[0];
         }
-        const cachedNode: IProblem | undefined = explorerNodeManager.getNodeById(id);
-        if (!cachedNode) {
-            vscode.window.showErrorMessage(`Failed to resolve the problem with id: ${id}.`);
+
+        if (!id) {
+            vscode.window.showErrorMessage(`Failed to resolve the problem id from file: ${fsPath}.`);
             return;
         }
-        node = cachedNode;
-        // Move the preview page aside if it's triggered from Code Lens
-        isSideMode = true;
-    } else {
-        node = input;
     }
+    const cachedNode: IProblem | undefined = explorerNodeManager.getNodeById(id);
+    if (!cachedNode) {
+        vscode.window.showErrorMessage(`Failed to resolve the problem with id: ${id}.`);
+        return;
+    }
+    node = cachedNode;
+    // Move the preview page aside if it's triggered from Code Lens
+    isSideMode = true;
+    // } else {
+    //     node = input;
+    // }
     const needTranslation: boolean = settingUtils.shouldUseEndpointTranslation();
     const descString: string = await leetCodeExecutor.getDescription(node.id, needTranslation);
     leetCodePreviewProvider.show(descString, node, isSideMode);