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define.class(function(require, exports){
var fs = require('fs')
var promisify = require('$system/lib/promisify')
if (fs) {
fs.statPromise = promisify(fs.stat)
}
var uid = 0
this.__trace__ = 2
this.atConstructor = function(delay){
this.files = {}
this.timeout = delay || 500
this.poll = this.poll.bind(this)
this.itv = setTimeout(this.poll, 0)
this.lastfire = 0
this.firelimit = 1000
this.uid = uid++
}
this.atChange = function(changed_file){}
this.poll = function(file){
var stats = []
var names = []
for(var k in this.files){
names.push(k)
stats.push(fs.statPromise(define.expandVariables(k)))
}
Promise.all(stats).then(function(results){
setTimeout(this.poll, this.timeout)
for(var i = 0;i < results.length; i++){
var file = names[i]
var res = results[i]
res.atime = null
var str = JSON.stringify(res)
if(this.files[file] !== null && this.files[file] !== str){
var now = Date.now()
if(now - this.lastfire > this.firelimit){
this.lastfire = now
try{
this.atChange(file)
}
catch(e){
throw e
}
}
}
this.files[file] = str
}
}.bind(this)).catch(function(err){
console.log("WATCH ERROR", err.stack)
})
}
this.watch = function(file ){
if(!(file in this.files)) this.files[file] = null
}
})
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