feat: add command to open existed markdown as markmap

fix #6

README.md

@@ -11,4 +11,11 @@ This extension integrates [markmap](https://markmap.js.org/) into VSCode.
 
 ## Usage
 
+### Open a markdown file as markmap
+
+- Open a markdown file, for instance `README.md`.
+- Open the Command Palette (⇧⌘P) and search `Open as markmap`, press enter.
+
+### Open a markmap file
+
 Create or open a file whose name ends with `.mm.md`, and enjoy.

package.json

@@ -19,9 +19,16 @@
     "markdown"
   ],
   "activationEvents": [
+    "onCommand:markmap-vscode.open",
     "onCustomEditor:markmap-vscode.markmap"
   ],
   "contributes": {
+    "commands": [
+      {
+        "command": "markmap-vscode.open",
+        "title": "Open as markmap"
+      }
+    ],
     "customEditors": [
       {
         "viewType": "markmap-vscode.markmap",

src/extension.ts

@@ -12,9 +12,11 @@ import {
   window,
   ViewColumn,
   workspace,
+  commands,
 } from 'vscode';
 import debounce from 'lodash.debounce';
 
+const PREFIX = 'markmap-vscode';
 const TOOLBAR_VERSION = process.env.TOOLBAR_VERSION;
 const TOOLBAR_CSS = `npm/markmap-toolbar@${TOOLBAR_VERSION}/dist/style.min.css`;
 const TOOLBAR_JS = `npm/markmap-toolbar@${TOOLBAR_VERSION}/dist/index.umd.min.js`;
@@ -28,7 +30,7 @@ document.body.append(el);`);
 const transformer = new Transformer();
 
 class MarkmapEditor implements CustomTextEditorProvider {
-  static readonly viewType = 'markmap-vscode.markmap';
+  static readonly viewType = `${PREFIX}.markmap`;
 
   constructor(public context: ExtensionContext) {}
 
@@ -160,6 +162,14 @@ class MarkmapEditor implements CustomTextEditorProvider {
 }
 
 export function activate(context: ExtensionContext) {
+  context.subscriptions.push(commands.registerCommand(`${PREFIX}.open`, () => {
+    commands.executeCommand(
+      'vscode.openWith',
+      window.activeTextEditor.document.uri,
+      MarkmapEditor.viewType,
+      ViewColumn.Beside,
+    );
+  }));
   context.subscriptions.push(window.registerCustomEditorProvider(
     MarkmapEditor.viewType,
     new MarkmapEditor(context),