Add custom variable for cpptools extension version (#488)

This custom allows to test, or definitely change the version of the
vscode extension. Currently the last tagged version is "1.5.1". The
default value stays "0.29.0" as "1.5.1" hasn't been thoroughly
tested.

Author: gagbo

dap-cpptools.el

@@ -1,6 +1,6 @@
 ;;; dap-cpptools.el --- Debug Adapter Protocol mode for cpptools      -*- lexical-binding: t; -*-
 
-;; Copyright (C) 2020  Ivan Yonchovski
+;; Copyright (C) 2021  Ivan Yonchovski
 
 ;; Author: Ivan Yonchovski <[email protected]>
 ;; Keywords: language, tools
@@ -28,12 +28,18 @@
 (require 'dap-utils)
 
 (defcustom dap-cpptools-debug-path (expand-file-name "vscode/cpptools" dap-utils-extension-path)
-  "The path to go vscode extension."
+  "The path to cpptools vscode extension."
+  :group 'dap-cpptools
+  :type 'string)
+
+(defcustom dap-cpptools-extension-version "0.29.0"
+  "The version of the cpptools vscode extension."
   :group 'dap-cpptools
   :type 'string)
 
 (defcustom dap-cpptools-download-url
-  (format "https://github.com/microsoft/vscode-cpptools/releases/download/0.29.0/cpptools-%s.vsix"
+  (format "https://github.com/microsoft/vscode-cpptools/releases/download/%s/cpptools-%s.vsix"
+          dap-cpptools-extension-version
           (alist-get system-type
                      '((windows-nt . "win32")
                        (darwin . "osx")
@@ -47,7 +53,7 @@
              (if (eq system-type 'windows-nt)
                  "/extension/debugAdapters/bin/OpenDebugAD7.exe"
                "/extension/debugAdapters/OpenDebugAD7")))
-  "The path to the go debugger."
+  "The path to the cpptools debug adapter."
   :group 'dap-cpptools
   :type '(repeat string))