Use stdio directly on "dumb" terminals

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

@@ -153,7 +153,7 @@ class Config
 
     def initialize
       merge!(
-        input: MemoizedValue.new { lazy_readline },
+        input: MemoizedValue.new { choose_input },
         output: $stdout.tap { |out| out.sync = true },
         commands: Pry::Commands,
         prompt_name: 'pry',
@@ -286,7 +286,17 @@ def control_d_handler=(value)
 
     private
 
-    def lazy_readline
+    def choose_input
+      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/input/simple_stdio.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class Pry
+  module Input
+    # Readline replacement for low-capability terminals.
+    class SimpleStdio
+      def self.readline(prompt)
+        Pry.config.output.print(prompt)
+        $stdin.gets
+      end
+    end
+  end
+end

spec/config_spec.rb

@@ -172,6 +172,28 @@
     end
   end
 
+  if defined?(Reline)
+    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
+  end
+
   describe "#method_missing" do
     context "when invoked method ends with =" do
       it "assigns a new custom option" do