feat: support VSCode insiders (#19)

* Add vscode insiders support

Author: abeatrix

README.md

@@ -11,6 +11,8 @@ The extension will try to open the file in a clone named by the last segment of
 
 - Set `vscode.open.uncPath` to true in your user settings to enable support for UNC (Universal Naming Convention) paths.
 
+- Set `vscode.open.insidersMode` to true in your user settings to open files in VS Code Insiders instead of regular VS Code.
+
 ## Examples
 
 ### Mac
@@ -63,3 +65,10 @@ To open repository files in your Home directory:
   "vscode.open.uncPath": true
 }
 ```
+
+## Development
+
+1. Run `yarn && yarn run serve` and keep the Parcel bundler process running.
+1. [Sideload the extension](https://docs.sourcegraph.com/extensions/authoring/local_development) (at the URL http://localhost:1234 by default) on your Sourcegraph instance or Sourcegraph.com.
+
+When you edit a source file in your editor, Parcel will recompile the extension. Reload the Sourcegraph web page to use the updated extension.

src/open-in-vscode.ts

@@ -7,6 +7,7 @@ function getOpenUrl(textDocumentUri: URL): URL {
     const repoBaseName = rawRepoName.split('/').pop()!
     const basePath: unknown = sourcegraph.configuration.get().value['vscode.open.basePath']
     const isUNC: boolean = sourcegraph.configuration.get().value['vscode.open.uncPath']
+    const insidersMode: boolean = sourcegraph.configuration.get().value['vscode.open.insidersMode']
     if (typeof basePath !== 'string') {
         throw new Error(
             `Setting \`vscode.open.basePath\` must be set in your [user settings](${new URL('/user/settings', sourcegraph.internal.sourcegraphURL.href).href}) to open files in VS Code.`
@@ -21,12 +22,12 @@ function getOpenUrl(textDocumentUri: URL): URL {
     const absolutePath = path.join(basePath, repoBaseName, relativePath)
 
     // if windows or enabled UNC path, add an extra slash in the beginning
-    let uri = '';
-    if (/^[a-zA-Z]:\\/.test(basePath) || isUNC) {
-        uri = 'vscode://file/' + absolutePath
-    } else {
-        uri = 'vscode://file' + absolutePath
-    }
+    const uncPath = /^[a-zA-Z]:\\/.test(basePath) || isUNC ? '/' : '';
+    // check if vscode-insiders mode is enabled
+    const mode = insidersMode ? 'vscode-insiders' : 'vscode';
+    // construct uri
+    const uri = mode + '://file' + uncPath + absolutePath;
+
     const openUrl = new URL(uri)
     if (sourcegraph.app.activeWindow?.activeViewComponent?.type === 'CodeEditor') {
         const selection = sourcegraph.app.activeWindow?.activeViewComponent?.selection