fix make_header bug (fix #286)

lib/pry/helpers/command_helpers.rb

@@ -40,13 +40,15 @@ class Pry
       end
 
       def make_header(meth, content=meth.source)
-        code_type = meth.source_type
-        num_lines = "Number of lines: #{Pry::Helpers::Text.bold(content.each_line.count.to_s)}"
-        case code_type
-        when :c
-          file = Pry::MethodInfo.info_for(meth).file
-          "\n#{Pry::Helpers::Text.bold('From:')} #{file} in Ruby Core (C Method):\n#{num_lines}\n\n"
+        header = "\n#{Pry::Helpers::Text.bold('From:')} #{meth.source_file} "
+
+        if meth.source_type == :c
+          header << "in Ruby Core (C Method):\n"
+        else
+          header << "@ line #{meth.source_line}:\n"
         end
+
+        header << "Number of lines: #{Pry::Helpers::Text.bold(content.each_line.count.to_s)}\n\n"
       end
 
       def file_map

lib/pry/method.rb

@@ -1,6 +1,6 @@
 class Pry
   class Method
-    include RbxMethod if defined?(RUBY_ENGINE) && RUBY_ENGINE =~ /rbx/
+    include RbxMethod if Helpers::BaseHelpers.rbx?
 
     class << self
       # Given a string representing a method name and optionally a binding to
@@ -127,7 +127,7 @@ class Pry
     #   `:ruby` for ordinary Ruby methods, `:c` for methods written in
     #   C, or `:rbx` for Rubinius core methods written in Ruby.
     def source_type
-      if defined?(RUBY_ENGINE) && RUBY_ENGINE =~ /rbx/
+      if Helpers::BaseHelpers.rbx?
         if core? then :rbx else :ruby end
       else
         if source_location.nil? then :c else :ruby end
@@ -137,7 +137,14 @@ class Pry
     # @return [String, nil] The name of the file the method is defined in, or
     #   `nil` if the filename is unavailable.
     def source_file
-      source_location.nil? ? nil : source_location.first
+      if source_location.nil?
+        if !Helpers::BaseHelpers.rbx? and source_type == :c
+          info = pry_doc_info
+          info.file if info
+        end
+      else
+        source_location.first
+      end
     end
 
     # @return [Fixnum, nil] The line of code in `source_file` which begins