Add hamlit cli

bin/hamlit

@@ -0,0 +1,6 @@
+#!/usr/bin/env ruby
+
+$:.unshift File.expand_path('../lib', __FILE__)
+require 'hamlit/cli'
+
+Hamlit::CLI.start(ARGV)

hamlit.gemspec

@@ -19,6 +19,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "temple"
+  spec.add_dependency "thor"
 
   spec.add_development_dependency "benchmark-ips"
   spec.add_development_dependency "bundler"

lib/hamlit/cli.rb

@@ -0,0 +1,72 @@
+require 'hamlit'
+require 'thor'
+
+module Hamlit
+  class CLI < Thor
+    desc 'render HAML', 'Render haml template'
+    def render(file)
+      code = generate_code(file)
+      puts eval(code)
+    end
+
+    desc 'compile HAML', 'Show generated rendering code'
+    def compile(file)
+      code = generate_code(file)
+      puts code
+    end
+
+    desc 'temple HAML', 'Show a compile result of hamlit AST'
+    def temple(file)
+      pp generate_temple_ast(file)
+    end
+
+    desc 'parse HAML', 'Show parse result'
+    def parse(file)
+      pp generate_hamlit_ast(file)
+    end
+
+    private
+
+    # Flexible default_task, compatible with haml's CLI
+    def method_missing(*args)
+      return super(*args) if args.length > 1
+
+      render(args.first.to_s)
+    end
+
+    def generate_code(file)
+      template = File.read(file)
+      Hamlit::Engine.new.call(template)
+    end
+
+    def generate_temple_ast(file)
+      chain = Hamlit::Engine.chain.map(&:first).map(&:to_s)
+      compilers = chain.select do |compiler|
+        compiler =~ /\AHamlit::/
+      end
+
+      template = File.read(file)
+      compilers.inject(template) do |exp, compiler|
+        Module.const_get(compiler).new.call(exp)
+      end
+    end
+
+    def generate_hamlit_ast(file)
+      template = File.read(file)
+      Hamlit::Parser.new.call(template)
+    end
+
+    # Enable colored pretty printing only for development environment.
+    # I don't think it is a good idea to add pry as runtime dependency
+    # just for debug color printing.
+    def pp(arg)
+      begin
+        require 'pry'
+        Pry::ColorPrinter.pp(arg)
+      rescue LoadError
+        require 'pp'
+        super(arg)
+      end
+    end
+  end
+end