initial import from bs

lib/ripl.rb

@@ -0,0 +1,4 @@
+require 'ripl/shell'
+
+module Ripl
+end

lib/ripl/shell.rb

@@ -0,0 +1,51 @@
+module Ripl
+  class Shell
+    OPTIONS = {:name=>'ripl', :line=>1, :result_prompt=>'=> ',
+      :binding=>TOPLEVEL_BINDING, :irbrc=>'~/.irbrc'}
+
+    attr_accessor :line, :binding, :result_prompt
+    attr_reader :has_autocompletion
+    def initialize(options={})
+      @options = OPTIONS.merge options
+      @name, @binding, @line = @options.values_at(:name, :binding, :line)
+      start_completion
+      load_rc
+    end
+
+    def start_completion
+      require 'bond'
+      Bond.start
+      @has_autocompletion = true
+    rescue LoadError
+      @has_autocompletion = false
+    end
+
+    def load_rc
+      load @options[:irbrc] if File.exists?(File.expand_path(@options[:irbrc]))
+    end
+
+    def eval_line(str)
+      eval(str, @binding, "(#{@name})", @line)
+    end
+
+    def print_eval_error(e)
+      warn "#{e.class}: #{e.message}"
+    end
+
+    def format_result(result)
+      @options[:result_prompt] + result.inspect
+    end
+
+    def loop_once(input)
+      begin
+        result = eval_line(input)
+      rescue Exception => e
+        print_eval_error(e)
+      end
+
+      eval("_ = #{result.inspect}", @binding) rescue nil
+      @line += 1
+      format_result result
+    end
+  end
+end