Get REPL working

bin/chervil

@@ -0,0 +1,12 @@
+#!/usr/bin/env ruby
+
+require "chervil"
+require "readline"
+
+
+env = Chervil::Env.new
+while line = Readline.readline("> ", true)
+  lexer = Chervil::Lexer.new(line)
+  tree = Chervil::Parser.new(lexer).parse
+  puts Chervil::Interpreter.new(tree, env).interpret
+end

lib/chervil.rb

@@ -6,3 +6,6 @@ require 'chervil/lexer'
 require 'chervil/parser'
 require 'chervil/token'
 require 'chervil/version'
+
+module Chervil
+end

lib/chervil/ast.rb

@@ -1,7 +1,11 @@
-module Chervil::AST
-  require "chervil/ast/application"
-  require "chervil/ast/definition"
-  require "chervil/ast/identifier"
-  require "chervil/ast/number"
-  require "chervil/ast/string"
+require "chervil"
+
+module Chervil
+  module AST
+    require "chervil/ast/application"
+    require "chervil/ast/definition"
+    require "chervil/ast/identifier"
+    require "chervil/ast/number"
+    require "chervil/ast/string"
+  end
 end