ignore generated files in watcher

Author: bobzhang

jscomp/bin/bsb_watcher.js

@@ -37,8 +37,12 @@ function acquireBuild(){
         return true
     }
 }
-var sourcedirs = path.join('lib', 'bs', ".sourcedirs.json")
-function watch_build(watch_files) {
+var sourcedirs = path.join('lib', 'bs', '.sourcedirs.json')
+var watch_generated  = []
+
+function watch_build(watch_config) {
+    var watch_files = watch_config.dirs 
+    watch_generated = watch_config.generated
     // close and remove all unused watchers
     watchers = watchers.filter(function(watcher){
         if(watcher.dir === bsconfig){
@@ -78,7 +82,10 @@ function validEvent(eventType,fileName){
     if (!fileName)
         return true;
 
-    return  !(fileName === '.merlin' ||  fileName.endsWith('.js'))
+    return  !(fileName === '.merlin' ||  
+        fileName.endsWith('.js') ||
+        watch_generated.indexOf(fileName) >= 0
+    )
 }
 /**
  * @return {boolean}
@@ -113,11 +120,7 @@ function build() {
  */
 function on_change(event, reason) {    
     if(validEvent(event,reason)){
-<<<<<<< 864d25584eb7e9f72c074a3ff0b277c48750e4bf
         console.log("Event", event,reason);
-=======
-        console.log("Event", event, reason);
->>>>>>> wip
         reasons_to_rebuild.push([event, reason])
         if(needRebuild()){
             build()
@@ -129,13 +132,13 @@ function getWatchFiles(file) {
     if (fs.existsSync(file)){
         return JSON.parse(fs.readFileSync(file, 'utf8'))
     } else {
-        return []
+        return { dirs : [], generated : []}
     }
 
 }
 
 
-// Initialization, watch `bsconfig.json`
-watchers.push({watcher : fs.watch(bsconfig,on_change) , dir : bsconfig});
+// Initialization
 
+watchers.push({watcher : fs.watch(bsconfig,on_change) , dir : bsconfig});
 build();