Debugger cancel (#976)

* implement cancel and progress notification in debugger

add progress notification and cancel support
remove debugExpressionTimeoutMs setting
add unexpected error handling
do not return evaluation errors as success responses
make completions async and cancellable
make evaluate async and cancellable
raise on invalid arguments

* disable sendTelemetry

* make variables request async

README.md

@@ -334,7 +334,6 @@ Below is a list of configuration options supported by the ElixirLS Debugger. Con
   <dt>stackTraceMode</dt><dd>Debugger stacktrace mode - Allowed values are `all`, `no_tail`, and `false`.</dd>
   <dt>requireFiles</dt><dd>A list of additional files that should be required and interpreted - This is especially useful for debugging tests.</dd>
   <dt>debugInterpretModulesPatterns</dt><dd>A list of globs specifying modules that should be interpreted</dd>
-  <dt>debugExpressionTimeoutMs</dt><dd>Expression evaluator timeout in milliseconds - This defaults to 10 000.</dd>
   <dt>projectDir</dt><dd>An absolute path to the directory where `mix.exs` is located - In VSCode, `${workspaceRoot}` can be used.</dd>
   <dt>excludeModules</dt><dd>A list of modules that should not be interpreted</dd>
 </dl>

apps/elixir_ls_debugger/lib/debugger/protocol.basic.ex

@@ -2,7 +2,7 @@ defmodule ElixirLS.Debugger.Protocol.Basic do
   @moduledoc """
   Macros for VS Code debug protocol messages
 
-  These macros can be used for pattern matching or for creating messages corresponding to the 
+  These macros can be used for pattern matching or for creating messages corresponding to the
   request, response, and event types as specified in VS Code debug protocol.
   """
 
@@ -49,7 +49,9 @@ defmodule ElixirLS.Debugger.Protocol.Basic do
           "error" => %{
             "id" => unquote(seq),
             "format" => unquote(format),
-            "variables" => unquote(variables)
+            "variables" => unquote(variables),
+            "showUser" => false,
+            "sendTelemetry" => false
           }
         }
       }

apps/elixir_ls_debugger/lib/debugger/protocol.ex

@@ -20,6 +20,12 @@ defmodule ElixirLS.Debugger.Protocol do
     end
   end
 
+  defmacro cancel_req(seq, args) do
+    quote do
+      request(unquote(seq), "cancel", unquote(args))
+    end
+  end
+
   defmacro launch_req(seq, config) do
     quote do
       request(unquote(seq), "launch", unquote(config))