Refactor completion API (git diff -w)

lib/pry/commands/shell_mode.rb

@@ -12,8 +12,6 @@ class Pry
       else
         _pry_.push_prompt Pry::SHELL_PROMPT
         _pry_.custom_completions = Pry::FILE_COMPLETIONS
-        Readline.completion_proc = Pry::InputCompleter.build_completion_proc target,
-        _pry_.instance_eval(&Pry::FILE_COMPLETIONS)
       end
     end
   end

lib/pry/completion.rb

@@ -3,37 +3,38 @@
 class Pry
 
   module BondCompleter
-
-    def self.build_completion_proc(target, pry=nil, commands=[""])
-      if !@started
-        @started = true
-        start
-      end
-
-      Pry.th[:pry] = pry
-      proc{ |*a| Bond.agent.call(*a) }
+    def self.call(input, options)
+      Pry.th[:pry] = options[:pry]
+      Bond.agent.call(input)
     end
 
     def self.start
-      Bond.start(:eval_binding => lambda{ Pry.th[:pry].current_context })
+      Bond.start(:eval_binding => lambda{ Pry.th[:pry] && Pry.th[:pry].current_context || TOPLEVEL_BINDING })
       Bond.complete(:on => /\A/) do |input|
         Pry.commands.complete(input.line,
                              :pry_instance => Pry.th[:pry],
                              :target       => Pry.th[:pry].current_context,
                              :command_set  => Pry.th[:pry].commands)
       end
+      self
     end
-
   end
 
   # Implements tab completion for Readline in Pry
   module InputCompleter
 
+    def self.call(input, options)
+      build_completion_proc(options[:target], options[:pry], options[:custom_completions]).call input
+    end
+
+    def self.start
       if Readline.respond_to?("basic_word_break_characters=")
         Readline.basic_word_break_characters = " \t\n\"\\'`><=;|&{("
       end
 
       Readline.completion_append_character = nil
+      self
+    end
 
     ReservedWords = [
       "BEGIN", "END",
@@ -63,16 +64,18 @@ class Pry
     # Return a new completion proc for use by Readline.
     # @param [Binding] target The current binding context.
     # @param [Array<String>] commands The array of Pry commands.
-    def self.build_completion_proc(target, pry=nil, commands=[""])
+    def self.call(input, options)
 
-      proc do |input|
+      custom_completions = options[:custom_completions] || []
 
       # if there are multiple contexts e.g. cd 1/2/3
       # get new target for 1/2 and find candidates for 3
       path, input = build_path(input)
 
-        unless path.call.empty?
-          target, _ = Pry::Helpers::BaseHelpers.context_from_object_path(path.call, pry) 
+      if path.call.empty?
+        target = options[:target]
+      else
+        target, _ = Pry::Helpers::BaseHelpers.context_from_object_path(path.call, options[:pry])
         target = target.last
       end
 
@@ -250,14 +253,13 @@ class Pry
           if eval("respond_to?(:class_variables)", bind)
             candidates += eval("class_variables", bind).collect(&:to_s)
           end
-            candidates = (candidates|ReservedWords|commands).grep(/^#{Regexp.quote(input)}/)
+          candidates = (candidates|ReservedWords|custom_completions).grep(/^#{Regexp.quote(input)}/)
           candidates.collect(&path)
         end
       rescue RescuableException
         []
       end
     end
-    end
 
     def self.select_message(path, receiver, message, candidates)
       candidates.grep(/^#{message}/).collect do |e|

lib/pry/pry_class.rb

@@ -270,9 +270,9 @@ class Pry
     config.output_prefix = "=> "
 
     if defined?(Bond) && Readline::VERSION !~ /editline/i
-      config.completer = Pry::BondCompleter
+      config.completer = Pry::BondCompleter.start
     else
-      config.completer = Pry::InputCompleter
+      config.completer = Pry::InputCompleter.start
     end
 
     config.gist ||= OpenStruct.new

lib/pry/pry_instance.rb

@@ -171,6 +171,18 @@ class Pry
     end
   end
 
+  # Generate completions.
+  #
+  # @param [String]  what the user has typed so far
+  # @return [Array<String>]  possible completions
+  def complete(input)
+    Pry.critical_section do
+      Pry.config.completer.call(input, :target => current_binding,
+                                       :pry  => self,
+                                       :custom_completions => instance_eval(&custom_completions))
+    end
+  end
+
   # Injects a local variable into the provided binding.
   # @param [String] name The name of the local to inject.
   # @param [Object] value The value to set the local to.

lib/pry/repl.rb

@@ -70,15 +70,11 @@ class Pry
       @indent.reset if pry.eval_string.empty?
 
       current_prompt = pry.select_prompt
-      completion_proc = Pry.config.completer.build_completion_proc(pry.current_binding, pry,
-                                                          pry.instance_eval(&pry.custom_completions))
-
-      safe_completion_proc = proc{ |*a| Pry.critical_section{ completion_proc.call(*a) } }
 
       indentation = Pry.config.auto_indent ? @indent.current_prefix : ''
 
       begin
-        val = read_line("#{current_prompt}#{indentation}", safe_completion_proc)
+        val = read_line("#{current_prompt}#{indentation}")
 
       # Handle <Ctrl+C> like Bash, empty the current input buffer but do not quit.
       # This is only for ruby-1.9; other versions of ruby do not let you send Interrupt
@@ -148,15 +144,17 @@ class Pry
     # Returns the next line of input to be used by the pry instance.
     # @param [String] current_prompt The prompt to use for input.
     # @return [String] The next line of input.
-    def read_line(current_prompt="> ", completion_proc=nil)
+    def read_line(current_prompt)
       handle_read_errors do
         if defined? Coolline and input.is_a? Coolline
           input.completion_proc = proc do |cool|
-            completions = completion_proc.call cool.completed_word
+            completions = @pry.complete cool.completed_word
             completions.compact
           end
         elsif input.respond_to? :completion_proc=
-          input.completion_proc = completion_proc
+          input.completion_proc = proc do |input|
+            @pry.complete input
+          end
         end
 
         if input == Readline

spec/completion_spec.rb

@@ -1,12 +1,8 @@
 require 'helper'
 
-def new_completer(bind, pry=nil)
-    Pry::InputCompleter.build_completion_proc(Pry.binding_for(bind), pry)
-end
-
 def completer_test(bind, pry=nil, assert_flag=true)
-  completer = new_completer(bind, pry)
-  test = proc {|symbol| completer.call(symbol[0..-2]).include?(symbol).should  == assert_flag}
+  test = proc {|symbol|
+    Pry::InputCompleter.call(symbol[0..-2], :target => Pry.binding_for(bind), :pry => pry).include?(symbol).should  == assert_flag}
   return proc {|*symbols| symbols.each(&test) }
 end
 
@@ -40,16 +36,12 @@ describe Pry::InputCompleter do
   # another jruby hack :((
   if !Pry::Helpers::BaseHelpers.jruby?
     it "should not crash if there's a Module that has a symbolic name." do
-      completer = Pry::InputCompleter.build_completion_proc(Pry.binding_for(Object.new))
-      lambda{ completer.call "a.to_s." }.should.not.raise Exception
+      lambda{ Pry::InputCompleter.call "a.to_s.", :target => Pry.binding_for(Object.new) }.should.not.raise Exception
     end
   end
 
   it 'should take parenthesis and other characters into account for symbols' do
-    b         = Pry.binding_for(Object.new)
-    completer = Pry::InputCompleter.build_completion_proc(b)
-
-    lambda { completer.call(":class)") }.should.not.raise(RegexpError)
+    lambda { Pry::InputCompleter.call(":class)", :target => Pry.binding_for(Object.new)) }.should.not.raise(RegexpError)
   end
 
   it 'should complete instance variables' do
@@ -128,7 +120,7 @@ describe Pry::InputCompleter do
     completer_test(binding).call('o.foo')
 
     # trailing slash
-    new_completer(Mod).call('Mod2/').include?('Mod2/').should   == true
+    Pry::InputCompleter.call('Mod2/', :target => Pry.binding_for(Mod)).include?('Mod2/').should   == true
   end
 
   it 'should complete for arbitrary scopes' do
@@ -199,7 +191,7 @@ describe Pry::InputCompleter do
     completer_test(binding).call('o.foo')
 
     # trailing slash
-    new_completer(Mod).call('Mod2/').include?('Mod2/').should   == true
+    Pry::InputCompleter.call('Mod2/', :target => Pry.binding_for(Mod)).include?('Mod2/').should   == true
 
   end