replace tput with ansi codes, and fix bug with long lines

lib/pry/helpers/base_helpers.rb

@@ -65,6 +65,10 @@ class Pry
         end
       end
 
+      def use_ansi_codes?
+        ENV['TERM'] != "dumb"
+      end
+
       def colorize_code(code)
         if Pry.color
           CodeRay.scan(code, :ruby).term

lib/pry/indent.rb

@@ -9,7 +9,7 @@ class Pry
   # will be indented or un-indented by correctly.
   #
   class Indent
-    # Array containing all the indentation levels.
+    # String containing the spaces to be inserted before the next line.
     attr_reader :indent_level
 
     # The amount of spaces to insert for each indent level.
@@ -169,19 +169,18 @@ class Pry
       (last_token =~ /^[)\]}\/]$/ || STATEMENT_END_TOKENS.include?(last_kind))
     end
 
-    # Fix the indentation for closing tags (notably 'end'). This method currently
-    # does nothing on Windows, since `tput` isn't supported.
+    # Fix the indentation for closing tags (notably 'end').
     #
     # @param [String] full_line The full line of input, including the prompt.
     #
     def correct_indentation(full_line)
-      if !Kernel.const_defined?(:Win32)
-        # The whitespace is used to "clear" the current line so existing
-        # characters don't show up.
-        spaces = ' ' * full_line.length
+      rws, cols = Readline.get_screen_size
+      lines     = full_line.length / cols
+      move_up   = "\e[#{lines+1}F"
+      kill_line = "\e[0K"
+      move_down = "\e[#{lines}E"
 
-        $stdout.write(`tput sc` + `tput cuu1` + full_line + spaces + `tput rc`)
-      end
+      $stdout.print(move_up, full_line, kill_line, move_down)
     end
   end
 end

lib/pry/pry_class.rb

@@ -185,7 +185,7 @@ class Pry
     config.exception_whitelist = DEFAULT_EXCEPTION_WHITELIST
     config.hooks = DEFAULT_HOOKS
     config.input_stack = []
-    config.color = true
+    config.color = Pry::Helpers::BaseHelpers.use_ansi_codes?
     config.pager = true
     config.system = DEFAULT_SYSTEM
     config.editor = default_editor_for_platform

lib/pry/pry_instance.rb

@@ -310,7 +310,10 @@ class Pry
 
       if !@command_processor.valid_command?(val, target) && Pry.config.auto_indent && input == Readline
         val = @indent.indent(val)
-        @indent.correct_indentation(current_prompt + val)
+
+        if Pry::Helpers::BaseHelpers.use_ansi_codes?
+          @indent.correct_indentation(current_prompt + val)
+        end
       end
 
       Pry.history << val.dup