completely reorganized for a gem and the 'coffee-script' command

lib/coffee_script/command_line.rb

@@ -0,0 +1,99 @@
+require 'optparse'
+require 'fileutils'
+require 'open3'
+require File.expand_path(File.dirname(__FILE__) + '/../coffee-script')
+
+module CoffeeScript
+
+  class CommandLine
+
+    BANNER = <<-EOS
+coffee-script compiles CoffeeScript files into JavaScript.
+
+Usage:
+  coffee-script path/to/script.cs
+    EOS
+
+    def initialize
+      parse_options
+      check_sources
+      compile_javascript
+    end
+
+    def usage
+      puts "\n#{@option_parser}\n"
+      exit
+    end
+
+
+    private
+
+    def compile_javascript
+      @sources.each do |source|
+        contents = CoffeeScript.compile(File.open(source))
+        next puts(contents) if @options[:print]
+        next lint(contents) if @options[:lint]
+        File.open(path_for(source), 'w+') {|f| f.write(contents) }
+      end
+    end
+
+    def check_sources
+      usage if @sources.empty?
+      missing = @sources.detect {|s| !File.exists?(s) }
+      if missing
+        STDERR.puts("File not found: '#{missing}'")
+        exit(1)
+      end
+    end
+
+    # Pipe compiled JS through JSLint.
+    def lint(js)
+      stdin, stdout, stderr = Open3.popen3('jsl -nologo -stdin')
+      stdin.write(js)
+      stdin.close
+      print stdout.read
+      stdout.close and stderr.close
+    end
+
+    # Write out JavaScript alongside CoffeeScript unless an output directory
+    # is specified.
+    def path_for(source)
+      filename = File.basename(source, File.extname(source)) + '.js'
+      dir      = @options[:output] || File.dirname(source)
+      File.join(dir, filename)
+    end
+
+    def parse_options
+      @options = {}
+      @option_parser = OptionParser.new do |opts|
+        opts.on('-o', '--output [DIR]', 'set the directory for compiled javascript') do |d|
+          @options[:output] = d
+          FileUtils.mkdir_p(d) unless File.exists?(d)
+        end
+        opts.on('-p', '--print', 'print the compiled javascript to stdout') do |d|
+          @options[:print] = true
+        end
+        opts.on('-l', '--lint', 'pipe the compiled javascript through JSLint') do |l|
+          @options[:lint] = true
+        end
+        opts.on_tail('-v', '--version', 'display coffee-script version') do
+          puts "coffee-script version #{CoffeeScript::VERSION}"
+          exit
+        end
+        opts.on_tail('-h', '--help', 'display this help message') do
+          usage
+        end
+      end
+      @option_parser.banner = BANNER
+      begin
+        @option_parser.parse!(ARGV)
+      rescue OptionParser::InvalidOption => e
+        puts e.message
+        exit(1)
+      end
+      @sources = ARGV
+    end
+
+  end
+
+end