Use a simple STDIO for when input defaults to Reline and TERM=dumb

lib/pry.rb

@@ -57,6 +57,8 @@
 require 'pry/config/lazy_value'
 require 'pry/config'
 
+require 'pry/input/simple_stdio'
+
 require 'pry/pry_class'
 require 'pry/pry_instance'
 require 'pry/inspector'

lib/pry/config.rb

@@ -287,8 +287,16 @@ def control_d_handler=(value)
     private
 
     def choose_input
-      return InputStdioShim.new if Pry::Env['TERM'] == 'dumb'
+      input = load_readline
 
+      if Pry::Env['TERM'] == 'dumb' && (defined?(Reline) && input == Reline)
+        input = Pry::Input::SimpleStdio
+      end
+
+      input
+    end
+
+    def load_readline
       require 'readline'
       ::Readline
     rescue LoadError

lib/pry/config/input_stdio_shim.rb

@@ -2,7 +2,7 @@
 
 class Pry
   # Readline replacement for low-capability terminals.
-  class InputStdioShim
+  class StdioInput
     def readline(prompt)
       $stdout.print(prompt)
       $stdin.gets

spec/config_spec.rb

@@ -172,6 +172,26 @@
     end
   end
 
+  describe "#input" do
+    context "when TERM=dumb" do
+      around do |example|
+        old_term = ENV['TERM']
+        ENV['TERM'] = 'dumb'
+
+        example.run
+        ENV['TERM'] = old_term
+      end
+
+      it "configures input with SimpleStdio" do
+        expect(subject.input).to eql(Pry::Input::SimpleStdio)
+      end
+    end
+
+    it "configures input with SimpleStdio" do
+      expect(subject.input).to eql(Readline)
+    end
+  end
+
   describe "#method_missing" do
     context "when invoked method ends with =" do
       it "assigns a new custom option" do