Pry 0.12.0 Deprecation warnings

lib/guard/jobs/pry_wrapper.rb

@@ -276,11 +276,10 @@ module Guard
       #
       def _prompt(ending_char)
         proc do |target_self, nest_level, pry|
-          history = pry.input_array.size
           process = Guard.listener.paused? ? "pause" : "guard"
           level = ":#{ nest_level }" unless nest_level.zero?
-          "[#{ history }] #{ _scope_for_prompt }#{ process }"\
+          "[#{ _history(pry) }] #{ _scope_for_prompt }#{ process }"\
             "(#{ _clip_name(target_self) })#{ level }#{ ending_char } "
         end
       end
@@ -288,6 +287,15 @@ module Guard
       def _clip_name(target)
         Pry.view_clip(target)
       end
+
+      def _history(pry)
+        # https://github.com/pry/pry/blob/5bf2585d0a49a4a3666a9eae80ee31153e3ffcf4/CHANGELOG.md#v0120-november-5-2018
+        if Pry::VERSION < "0.12.0"
+          return pry.input_array.size
+        end
+
+        pry.input_ring.size
+      end
     end
   end
 end

spec/lib/guard/jobs/pry_wrapper_spec.rb

@@ -140,7 +140,7 @@ RSpec.describe Guard::Jobs::PryWrapper do
       expect(Pry).to receive(:view_clip).and_return("main")
     end
-    let(:pry) { instance_double(Pry, input_array: []) }
+    let(:pry) { instance_double(Pry, input_ring: []) }
     context "Guard is not paused" do
       it 'displays "guard"' do
@@ -149,6 +149,17 @@ RSpec.describe Guard::Jobs::PryWrapper do
       end
     end
+    context "Guard is using a lower version of Pry" do
+      let(:pry) { instance_double(Pry, input_array: []) }
+
+      it 'displays "guard"' do
+        stub_const("Pry::VERSION", "0.11.0")
+
+        expect(prompt.call(double, 0, pry))
+          .to eq "[0] guard(main)> "
+      end
+    end
+
     context "Guard is paused" do
       before do
         allow(listener).to receive(:paused?).and_return(true)