feat: add reload command for ReloadableRequire

Author: ahogappa

lib/irb/command/reload.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+module IRB
+  # :stopdoc:
+
+  module Command
+    class Reload < Base
+      category "IRB"
+      description "Reload files that were loaded via require in IRB session."
+
+      def execute(_arg)
+        unless reloadable_require_available?
+          warn "The reload command requires IRB.conf[:RELOADABLE_REQUIRE] = true and Ruby::Box (Ruby 4.0+) with RUBY_BOX=1 environment variable."
+          return
+        end
+
+        files = IRB.conf[:__RELOADABLE_FILES__]
+        if files.empty?
+          puts "No files to reload. Use require to load files first."
+          return
+        end
+
+        files.each { |path| reload_file(path) }
+      end
+
+      private
+
+      def reloadable_require_available?
+        IRB.conf[:RELOADABLE_REQUIRE] && defined?(Ruby::Box) && Ruby::Box.enabled?
+      end
+
+      def reload_file(path)
+        load path
+        puts "Reloaded: #{path}"
+      rescue LoadError => e
+        warn "Failed to reload #{path}: #{e.message}"
+      rescue SyntaxError => e
+        warn "Syntax error in #{path}: #{e.message}"
+      end
+    end
+  end
+
+  # :startdoc:
+end

lib/irb/default_commands.rb

@@ -26,6 +26,7 @@
 require_relative "command/measure"
 require_relative "command/next"
 require_relative "command/pushws"
+require_relative "command/reload"
 require_relative "command/show_doc"
 require_relative "command/show_source"
 require_relative "command/step"
@@ -252,6 +253,7 @@ def load_command(command)
 
     register(:cd, Command::CD)
     register(:copy, Command::Copy)
+    register(:reload, Command::Reload)
   end
 
   ExtendCommand = Command