use code as node runtime on Linux/Mac

By setting the ELECTRON_RUN_AS_NODE environment variable, we can use `code` as a node runtime and execute shell.ts directly. However, this only works on non-Windows platforms because `code` has the GUI app flag set on Windows that makes stdin unusable. So, we will have to continue to use the nexe version on Windows until we can figure out a workaround.

Removing 2 out of 3 native binaries significantly reduces the download size.

Author: dlech

.gitattributes

@@ -1,5 +1,3 @@
-native/linux/helper filter=lfs diff=lfs merge=lfs -text
-native/darwin/helper filter=lfs diff=lfs merge=lfs -text
 native/win32/helper.exe filter=lfs diff=lfs merge=lfs -text
 
 *               text eol=lf

CHANGELOG.md

@@ -5,6 +5,7 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 
 ## Unreleased
 ### Changed
+- `ev3devBrowser` debugger type no longer uses native executable.
 - SSH shell no longer uses native executable on Linux and Mac.
 ### Fixed
 - Fix debugger hanging when ev3dev Device Browser view is collapsed

native/darwin/helper

@@ -24,6 +24,7 @@ let config: WorkspaceConfig;
 let output: vscode.OutputChannel;
 let resourceDir: string;
 let helperExePath: string;
+let shellPath: string;
 let ev3devBrowserProvider: Ev3devBrowserProvider;
 
 // this method is called when your extension is activated
@@ -36,6 +37,7 @@ export function activate(context: vscode.ExtensionContext): void {
     if (process.platform === 'win32') {
         helperExePath += '.exe';
     }
+    shellPath = context.asAbsolutePath(path.join('out', 'native-helper', 'shell.js'));
 
     ev3devBrowserProvider = new Ev3devBrowserProvider();
     context.subscriptions.push(
@@ -493,9 +495,11 @@ class DeviceTreeItem extends vscode.TreeItem {
     }
 
     public openSshTerminal(): void {
+        const isWin32 = os.platform() === 'win32';
+        const port = this.device.shellPort.toString();
         const term = vscode.window.createTerminal(`SSH: ${this.label}`,
-            helperExePath,
-            ['shell', this.device.shellPort.toString()]);
+            isWin32 ? helperExePath : '/usr/bin/env',
+            isWin32 ? ['shell', port] : ['ELECTRON_RUN_AS_NODE=1', process.execPath, shellPath, 'shell', port]);
         term.show();
     }