Remove order dependency between :input and :completer procs

This required switching Config::Default to use instance_eval instead of
call so that config procs can reference each other. I also brought over
a couple of copy changes from 0-9-12-stable.

lib/pry.rb

@@ -137,7 +137,8 @@ if Pry::Helpers::BaseHelpers.jruby?
   begin
     require 'ffi'
   rescue LoadError
-    warn "Need to `gem install ffi`"
+    # TODO: Why do we need this?
+    warn "For a better Pry experience on JRuby, please `gem install ffi`."
   end
 end
 
@@ -148,7 +149,8 @@ if Pry::Helpers::BaseHelpers.windows? && !Pry::Helpers::BaseHelpers.windows_ansi
     # only fail on jruby (where win32console doesn't work).
     # Instead we'll recommend ansicon, which does.
   rescue LoadError
-    warn "For a better pry experience, please use ansicon: https://github.com/adoxa/ansicon"
+    warn "For a better Pry experience on Windows, please use ansicon:"
+    warn "   http://adoxa.3eeweb.com/ansicon/"
   end
 end
 

lib/pry/config/default.rb

@@ -1,19 +1,8 @@
 class Pry::Config::Default
   include Pry::Config::Behavior
 
-  def self.lazy_readline
-    require 'readline'
-    Readline
-  rescue LoadError => e
-    warn "Pry says!"
-    warn "require of 'readline' has failed."
-    warn "you can rebuild ruby with readline support from C through '--with-readline'."
-    warn "alternatively, you can use the pure-ruby version of readline through 'gem install rb-readline'"
-    raise(e)
-  end
-
   default = {
-    :input                  => method(:lazy_readline).to_proc,
+    :input                  => proc { lazy_readline },
     :output                 => proc { $stdout },
     :commands               => proc { Pry::Commands },
     :prompt_name            => proc { Pry::DEFAULT_PROMPT_NAME },
@@ -46,13 +35,7 @@ class Pry::Config::Default
     :extra_sticky_locals    => proc { {} },
     :command_completer      => proc { proc { Pry.commands.commands.keys } },
     :file_completer         => proc { proc { Dir["."] } },
-    :completer => proc {
-      if defined?(Bond) && Readline::VERSION !~ /editline/i
-        Pry::BondCompleter.start
-      else
-        Pry::InputCompleter.start
-      end
-    }
+    :completer              => proc { lazy_completer }
   }
 
   def initialize
@@ -65,13 +48,14 @@ class Pry::Config::Default
   default.each do |key, value|
     define_method(key) do
       if default[key].equal?(value)
-        default[key] = value.call
+        default[key] = instance_eval(&value)
       end
       default[key]
     end
   end
 
 private
+
   # TODO:
   # all of this configure_* stuff is a relic of old code.
   # we should try move this code to being command-local.
@@ -112,4 +96,27 @@ private
       history.should_load = false
     end
   end
+
+  def lazy_readline
+    require 'readline'
+    Readline
+  rescue LoadError
+    warn "Sorry, you can't use Pry without Readline or a compatible library."
+    warn "Possible solutions:"
+    warn " * Rebuild Ruby with Readline support using `--with-readline`"
+    warn " * Use the rb-readline gem, which is a pure-Ruby port of Readline"
+    raise
+  end
+
+  def lazy_completer
+    if defined?(Bond) && !is_editline?(input)
+      Pry::BondCompleter.start
+    else
+      Pry::InputCompleter.start
+    end
+  end
+
+  def is_editline?(input)
+    defined?(input::VERSION) && input::VERSION =~ /editline/i
+  end
 end

spec/helper.rb

@@ -15,6 +15,9 @@ require 'spec_helpers/bacon'
 require 'spec_helpers/mock_pry'
 require 'spec_helpers/repl_tester'
 
+# FIXME: temporary until history is fixed to not need Readline
+require 'readline'
+
 class Module
   public :remove_const
   public :remove_method