Fix pry.config.output_prefix to work. Fix #1128

lib/pry.rb

@@ -19,9 +19,9 @@ class Pry
   end
 
   # The default print
-  DEFAULT_PRINT = proc do |output, value|
+  DEFAULT_PRINT = proc do |output, value, _pry_|
     Pry::Pager.with_pager(output) do |pager|
-      pager.print "=> "
+      pager.print _pry_.config.output_prefix
       Pry::ColorPrinter.pp(value, pager, Pry::Terminal.width! - 1)
     end
   end

lib/pry/pry_instance.rb

@@ -347,7 +347,7 @@ class Pry
     if last_result_is_exception?
       exception_handler.call(output, result, self)
     elsif should_print?
-      print.call(output, result)
+      print.call(output, result, self)
     else
       # nothin'
     end

spec/pry_output_spec.rb

@@ -35,8 +35,9 @@ describe Pry do
     end
 
     it "should include the =>" do
+      pry = Pry.new
       accumulator = StringIO.new
-      Pry.config.print.call(accumulator, [1])
+      pry.config.print.call(accumulator, [1], pry)
       accumulator.string.should == "=> \[1\]\n"
     end
 
@@ -49,6 +50,16 @@ describe Pry do
     end
   end
 
+  describe "output_prefix" do
+    it "should be able to change output_prefix" do
+      pry = Pry.new
+      accumulator = StringIO.new
+      pry.config.output_prefix = "-> "
+      pry.config.print.call(accumulator, [1], pry)
+      accumulator.string.should == "-> \[1\]\n"
+    end
+  end
+
   describe "color" do
     before do
       Pry.color = true
@@ -59,19 +70,21 @@ describe Pry do
     end
 
     it "should colorize strings as though they were ruby" do
+      pry = Pry.new
       accumulator = StringIO.new
       colorized   = CodeRay.scan("[1]", :ruby).term
-      Pry.config.print.call(accumulator, [1])
+      pry.config.print.call(accumulator, [1], pry)
       accumulator.string.should == "=> #{colorized}\n"
     end
 
     it "should not colorize strings that already include color" do
+      pry = Pry.new
       f = Object.new
       def f.inspect
         "\e[1;31mFoo\e[0m"
       end
       accumulator = StringIO.new
-      Pry.config.print.call(accumulator, f)
+      pry.config.print.call(accumulator, f, pry)
       # We add an extra \e[0m to prevent color leak
       accumulator.string.should == "=> \e[1;31mFoo\e[0m\e[0m\n"
     end