compiler.rb in barista-0.4.0

- old
+ new
@@ -1,51 +1,72 @@
 require 'digest/sha2'
 
 module Barista
   class Compiler
-    
+
     class << self; attr_accessor :bin_path; end
     self.bin_path ||= "coffee"
-    
-    def self.compile(path)
-      new(path).to_js
+
+    def self.available?
+      @coffee_available ||= system("command -v '#{self.bin_path}' >/dev/null 2>&1")
     end
-    
-    def initialize(path)
+
+    def self.check_availability!(silence = false)
+      available?.tap do |available|
+        if Barista.exception_on_error? && !silence
+          raise CompilerUnavailableError, "The coffeescript compiler '#{self.bin_path}' could not be found."
+        end
+      end
+    end
+
+    def self.compile(path, options = {})
+      new(path, options).to_js
+    end
+
+    def initialize(path, options = {})
       @compiled = false
+      @options  = {}
       @path     = path
     end
-    
+
     def compile!
       # Compiler code thanks to bistro_car.
       @compiled_content = invoke_coffee(@path)
       @compiled = true
     end
-    
+
     def to_js
       compile! unless @compiled
-      @compiled_content.to_s
+      @compiled_content
     end
-    
+
     def self.dirty?(from, to)
       File.exist?(from) && (!File.exist?(to) || File.mtime(to) < File.mtime(from))
     end
-    
+
     protected
-    
+
     def coffee_options
       ["-p"].tap do |options|
         options << "--no-wrap" if Barista.no_wrap?
       end.join(" ")
     end
-    
+
     def invoke_coffee(path)
       command = "#{self.class.bin_path} #{coffee_options} '#{path}'".squeeze(' ')
-      %x(#{command})
+      result = %x(#{command}).to_s
+      if !$?.success?
+        if Barista.exception_on_error? && !@options[:silence]
+          raise CompilationError, "\"#{command}\" exited with a non-zero status."
+        else
+          result = nil
+        end
+      end
+      result
     end
-    
+
     def content_hash
       @content_hash ||= Digest::SHA256.hexdigest(@content)
     end
-    
+
   end
 end