split into middleman-core and middleman-more

middleman-core/lib/middleman-core/core_extensions/file_watcher.rb

@@ -0,0 +1,83 @@
+require "find"
+
+# API for watching file change events
+module Middleman::CoreExtensions::FileWatcher
+  # Setup extension
+  class << self
+    # @private
+    def registered(app)
+      app.extend ClassMethods
+      app.send :include, InstanceMethods
+      
+      app.delegate :file_changed, :file_deleted, :to => :"self.class"
+      
+      # Before parsing config, load the data/ directory
+      app.before_configuration do
+        data_path = File.join(root, data_dir)
+        Find.find(data_path) do |path|
+          next if File.directory?(path)
+          file_did_change(path.sub("#{root}/", ""))
+        end if File.exists?(data_path)
+      end
+      
+      # After config, load everything else
+      app.ready do
+        Find.find(root) do |path|
+          next if File.directory?(path)
+          file_did_change(path.sub("#{root}/", ""))
+        end
+      end
+    end
+    alias :included :registered
+  end
+  
+  # Class methods
+  module ClassMethods
+    # Add callback to be run on file change
+    #
+    # @param [nil,Regexp] matcher A Regexp to match the change path against
+    # @return [Array<Proc>]
+    def file_changed(matcher=nil, &block)
+      @_file_changed ||= []
+      @_file_changed << [block, matcher] if block_given?
+      @_file_changed
+    end
+    
+    # Add callback to be run on file deletion
+    #
+    # @param [nil,Regexp] matcher A Regexp to match the deleted path against
+    # @return [Array<Proc>]
+    def file_deleted(matcher=nil, &block)
+      @_file_deleted ||= []
+      @_file_deleted << [block, matcher] if block_given?
+      @_file_deleted
+    end
+  end
+  
+  # Instance methods
+  module InstanceMethods
+    # Notify callbacks that a file changed
+    #
+    # @param [String] path The file that changed
+    # @return [void]
+    def file_did_change(path)
+      file_changed.each do |callback, matcher|
+        next if path.match(%r{^#{build_dir}/})
+        next if !matcher.nil? && !path.match(matcher)
+        instance_exec(path, &callback)
+      end
+    end
+
+    # Notify callbacks that a file was deleted
+    #
+    # @param [String] path The file that was deleted
+    # @return [void]
+    def file_did_delete(path)
+      file_deleted.each do |callback, matcher|
+        next if path.match(%r{^#{build_dir}/})
+        next unless matcher.nil? || path.match(matcher)
+        instance_exec(path, &callback)
+      end
+    end
+  end
+end