Watcher should track newly created files

Currently newly created are added to the graph but not added the
watcher.

Fixes sass#1891

Author: xzyfer

bin/node-sass

@@ -229,22 +229,6 @@ function getOptions(args, options) {
  */
 
 function watch(options, emitter) {
-  var buildGraph = function(options) {
-    var graph;
-    var graphOptions = {
-      loadPaths: options.includePath,
-      extensions: ['scss', 'sass', 'css']
-    };
-
-    if (options.directory) {
-      graph = grapher.parseDir(options.directory, graphOptions);
-    } else {
-      graph = grapher.parseFile(options.src, graphOptions);
-    }
-
-    return graph;
-  };
-
   var watch = [];
   var graph = buildGraph(options);
 
@@ -258,34 +242,53 @@ function watch(options, emitter) {
   gaze.on('error', emitter.emit.bind(emitter, 'error'));
 
   gaze.on('changed', function(file) {
-    var files = [file];
+    updateWatcher(file, graph, gaze, options);
+  });
+  gaze.on('added', function(file) {
+    updateWatcher(file, graph, gaze, options);
+  });
 
-    // descendents may be added, so we need a new graph
+  gaze.on('deleted', function() {
     graph = buildGraph(options);
-    graph.visitAncestors(file, function(parent) {
-      files.push(parent);
-    });
-
-    // Add children to watcher
-    graph.visitDescendents(file, function(child) {
-      if (watch.indexOf(child) === -1) {
-        watch.push(child);
-        gaze.add(child);
-      }
-    });
-    files.forEach(function(file) {
-      if (path.basename(file)[0] !== '_') {
-        renderFile(file, options, emitter);
-      }
-    });
   });
+}
 
-  gaze.on('added', function() {
-    graph = buildGraph(options);
+function buildGraph (options) {
+  var graph;
+  var graphOptions = {
+    loadPaths: options.includePath,
+    extensions: ['scss', 'sass', 'css']
+  };
+
+  if (options.directory) {
+    graph = grapher.parseDir(options.directory, graphOptions);
+  } else {
+    graph = grapher.parseFile(options.src, graphOptions);
+  }
+
+  return graph;
+}
+
+function updateWatcher(file, graph, gaze) {
+  var files = [file];
+
+  // descendents may be added, so we need a new graph
+  graph = buildGraph(options);
+  graph.visitAncestors(file, function(parent) {
+    files.push(parent);
   });
 
-  gaze.on('deleted', function() {
-    graph = buildGraph(options);
+  // Add children to watcher
+  graph.visitDescendents(file, function(child) {
+    if (watch.indexOf(child) === -1) {
+      watch.push(child);
+      gaze.add(child);
+    }
+  });
+  files.forEach(function(file) {
+    if (path.basename(file)[0] !== '_') {
+      renderFile(file, options, emitter);
+    }
   });
 }