Change drive letter before cd in case of cmd.exe

Fixes Tyriar#4

Check for cmd.exe in config, similar to wsl bash check
and send 1st two characters of the path before doing cd to change drive letter.

src/extension.ts

@@ -22,13 +22,18 @@ export function activate(context: vscode.ExtensionContext) {
 
         let dir = path.dirname(uri.fsPath);
 
-        if(isWslBash(vscode.workspace.getConfiguration('terminal'))) {
-            // c:\workspace\foo to /mnt/c/workspace/foo
-            dir = dir.replace(/(\w):/, '/mnt/$1').replace(/\\/g, '/')
-        }
-
         let terminal = vscode.window.createTerminal();
         terminal.show(false);
+
+        switch(kindOfShell(vscode.workspace.getConfiguration('terminal'))) {
+            case "wslbash":
+                // c:\workspace\foo to /mnt/c/workspace/foo
+                dir = dir.replace(/(\w):/, '/mnt/$1').replace(/\\/g, '/')
+                break;
+            case "cmd":
+                terminal.sendText(dir.slice(0,2));
+        }
+
         terminal.sendText(`cd "${dir}"`);
     });
 
@@ -38,19 +43,21 @@ export function activate(context: vscode.ExtensionContext) {
 export function deactivate() {
 }
 
-function isWslBash(terminalSettings) {
+function kindOfShell(terminalSettings) {
     const windowsShellPath = terminalSettings.integrated.shell.windows;
 
     if(!windowsShellPath) {
-        return false;
+        return undefined;
     }
 
     // Detect WSL bash according to the implementation of VS Code terminal.
     // For more details, refer to https://goo.gl/AuwULb
     const is32ProcessOn64Windows = process.env.hasOwnProperty('PROCESSOR_ARCHITEW6432');
     const system32 = is32ProcessOn64Windows ? 'Sysnative' : 'System32';
-    const expectedWslBashPath = path.join(process.env.windir, system32, 'bash.exe');
+    var shellKindByPath = {}
+    shellKindByPath[path.join(process.env.windir, system32, 'bash.exe').toLowerCase()] = "wslbash";
+    shellKindByPath[path.join(process.env.windir, system32, 'cmd.exe').toLowerCase()] = "cmd";
 
     // %windir% can give WINDOWS instead of Windows
-    return windowsShellPath.toLowerCase() === expectedWslBashPath.toLowerCase();
+    return shellKindByPath[windowsShellPath.toLowerCase()]
 }