whereami: support -f to show the full file like pry

lib/irb/command/whereami.rb

@@ -6,10 +6,13 @@ module IRB
   module Command
     class Whereami < Base
       category "Context"
-      description "Show the source code around binding.irb again."
+      description "Show the source code around binding.irb again. `-f` shows the full file."
+
+      def execute(arg)
+        code = irb_context.workspace.code_around_binding(
+          show_full_file: arg.split.first == "-f"
+        )
 
-      def execute(_arg)
-        code = irb_context.workspace.code_around_binding
         if code
           puts code
         else

lib/irb/workspace.rb

@@ -125,7 +125,7 @@ def filter_backtrace(bt)
       bt
     end
 
-    def code_around_binding
+    def code_around_binding(show_full_file: false)
       file, pos = @binding.source_location
 
       if defined?(::SCRIPT_LINES__[file]) && lines = ::SCRIPT_LINES__[file]
@@ -141,8 +141,13 @@ def code_around_binding
       lines = Color.colorize_code(code).lines
       pos -= 1
 
-      start_pos = [pos - 5, 0].max
-      end_pos   = [pos + 5, lines.size - 1].min
+      if show_full_file
+        start_pos = 0
+        end_pos   = lines.size - 1
+      else
+        start_pos = [pos - 5, 0].max
+        end_pos   = [pos + 5, lines.size - 1].min
+      end
 
       line_number_fmt = Color.colorize("%#{end_pos.to_s.length}d", [:BLUE, :BOLD])
       fmt = " %2s #{line_number_fmt}: %s"

test/irb/test_command.rb

@@ -595,6 +595,14 @@ def test_whereami_alias
       assert_empty err
       assert_match(/^From: .+ @ line \d+ :\n/, out)
     end
+
+    def test_whereami_file
+      out, err = execute_lines(
+        "whereami -f\n",
+      )
+      assert_empty err
+      assert_match(/^From: .+ @ line \d+ :\n\s+1:/, out)
+    end
   end
 
   class LsTest < CommandTestCase