[ruby/irb] Powerup show_source by enabling RubyVM.keep_script_lines

(https://github.com/ruby/irb/pull/862)

* Powerup show_source by enabling RubyVM.keep_script_lines

* Add file_content field to avoid reading file twice while show_source

* Change path passed to eval, don't change irb_path.

* Encapsulate source coloring logic and binary file check insode class Source

* Add edit command testcase when irb_path does not exist

* Memoize irb_path existence to reduce file existence check calculating eval_path

https://github.com/ruby/irb/commit/239683a937

1 files changed, 10 insertions, 2 deletions

diff --git a/lib/irb/context.rb b/lib/irb/context.rb
index e30125f46b..814a8bd4ad 100644
--- a/lib/irb/context.rb
+++ b/lib/irb/context.rb
@@ -557,7 +557,7 @@ module IRB
 
       if IRB.conf[:MEASURE] && !IRB.conf[:MEASURE_CALLBACKS].empty?
         last_proc = proc do
-          result = @workspace.evaluate(line, irb_path, line_no)
+          result = @workspace.evaluate(line, eval_path, line_no)
         end
         IRB.conf[:MEASURE_CALLBACKS].inject(last_proc) do |chain, item|
           _name, callback, arg = item
@@ -568,12 +568,20 @@ module IRB
           end
         end.call
       else
-        result = @workspace.evaluate(line, irb_path, line_no)
+        result = @workspace.evaluate(line, eval_path, line_no)
       end
 
       set_last_value(result)
     end
 
+    private def eval_path
+      # We need to use differente path to distinguish source_location of method defined in the actual file and method defined in irb session.
+      if !defined?(@irb_path_existence) || @irb_path_existence[0] != irb_path
+        @irb_path_existence = [irb_path, File.exist?(irb_path)]
+      end
+      @irb_path_existence[1] ? "#{irb_path}(#{IRB.conf[:IRB_NAME]})" : irb_path
+    end
+
     def inspect_last_value # :nodoc:
       @inspect_method.inspect_value(@last_value)
     end