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+
+```
+
+## Documentation
+
+### Collections
+
+* [each](#each)
+* [eachSeries](#eachSeries)
+* [eachLimit](#eachLimit)
+* [map](#map)
+* [mapSeries](#mapSeries)
+* [mapLimit](#mapLimit)
+* [filter](#filter)
+* [filterSeries](#filterSeries)
+* [reject](#reject)
+* [rejectSeries](#rejectSeries)
+* [reduce](#reduce)
+* [reduceRight](#reduceRight)
+* [detect](#detect)
+* [detectSeries](#detectSeries)
+* [sortBy](#sortBy)
+* [some](#some)
+* [every](#every)
+* [concat](#concat)
+* [concatSeries](#concatSeries)
+
+### Control Flow
+
+* [series](#series)
+* [parallel](#parallel)
+* [parallelLimit](#parallellimittasks-limit-callback)
+* [whilst](#whilst)
+* [doWhilst](#doWhilst)
+* [until](#until)
+* [doUntil](#doUntil)
+* [forever](#forever)
+* [waterfall](#waterfall)
+* [compose](#compose)
+* [applyEach](#applyEach)
+* [applyEachSeries](#applyEachSeries)
+* [queue](#queue)
+* [cargo](#cargo)
+* [auto](#auto)
+* [iterator](#iterator)
+* [apply](#apply)
+* [nextTick](#nextTick)
+* [times](#times)
+* [timesSeries](#timesSeries)
+
+### Utils
+
+* [memoize](#memoize)
+* [unmemoize](#unmemoize)
+* [log](#log)
+* [dir](#dir)
+* [noConflict](#noConflict)
+
+
+## Collections
+
+
+
+### each(arr, iterator, callback)
+
+Applies an iterator function to each item in an array, in parallel.
+The iterator is called with an item from the list and a callback for when it
+has finished. If the iterator passes an error to this callback, the main
+callback for the each function is immediately called with the error.
+
+Note, that since this function applies the iterator to each item in parallel
+there is no guarantee that the iterator functions will complete in order.
+
+__Arguments__
+
+* arr - An array to iterate over.
+* iterator(item, callback) - A function to apply to each item in the array.
+ The iterator is passed a callback(err) which must be called once it has
+ completed. If no error has occured, the callback should be run without
+ arguments or with an explicit null argument.
+* callback(err) - A callback which is called after all the iterator functions
+ have finished, or an error has occurred.
+
+__Example__
+
+```js
+// assuming openFiles is an array of file names and saveFile is a function
+// to save the modified contents of that file:
+
+async.each(openFiles, saveFile, function(err){
+ // if any of the saves produced an error, err would equal that error
+});
+```
+
+---------------------------------------
+
+
+
+### eachSeries(arr, iterator, callback)
+
+The same as each only the iterator is applied to each item in the array in
+series. The next iterator is only called once the current one has completed
+processing. This means the iterator functions will complete in order.
+
+
+---------------------------------------
+
+
+
+### eachLimit(arr, limit, iterator, callback)
+
+The same as each only no more than "limit" iterators will be simultaneously
+running at any time.
+
+Note that the items are not processed in batches, so there is no guarantee that
+ the first "limit" iterator functions will complete before any others are
+started.
+
+__Arguments__
+
+* arr - An array to iterate over.
+* limit - The maximum number of iterators to run at any time.
+* iterator(item, callback) - A function to apply to each item in the array.
+ The iterator is passed a callback(err) which must be called once it has
+ completed. If no error has occured, the callback should be run without
+ arguments or with an explicit null argument.
+* callback(err) - A callback which is called after all the iterator functions
+ have finished, or an error has occurred.
+
+__Example__
+
+```js
+// Assume documents is an array of JSON objects and requestApi is a
+// function that interacts with a rate-limited REST api.
+
+async.eachLimit(documents, 20, requestApi, function(err){
+ // if any of the saves produced an error, err would equal that error
+});
+```
+
+---------------------------------------
+
+
+### map(arr, iterator, callback)
+
+Produces a new array of values by mapping each value in the given array through
+the iterator function. The iterator is called with an item from the array and a
+callback for when it has finished processing. The callback takes 2 arguments,
+an error and the transformed item from the array. If the iterator passes an
+error to this callback, the main callback for the map function is immediately
+called with the error.
+
+Note, that since this function applies the iterator to each item in parallel
+there is no guarantee that the iterator functions will complete in order, however
+the results array will be in the same order as the original array.
+
+__Arguments__
+
+* arr - An array to iterate over.
+* iterator(item, callback) - A function to apply to each item in the array.
+ The iterator is passed a callback(err, transformed) which must be called once
+ it has completed with an error (which can be null) and a transformed item.
+* callback(err, results) - A callback which is called after all the iterator
+ functions have finished, or an error has occurred. Results is an array of the
+ transformed items from the original array.
+
+__Example__
+
+```js
+async.map(['file1','file2','file3'], fs.stat, function(err, results){
+ // results is now an array of stats for each file
+});
+```
+
+---------------------------------------
+
+
+### mapSeries(arr, iterator, callback)
+
+The same as map only the iterator is applied to each item in the array in
+series. The next iterator is only called once the current one has completed
+processing. The results array will be in the same order as the original.
+
+
+---------------------------------------
+
+
+### mapLimit(arr, limit, iterator, callback)
+
+The same as map only no more than "limit" iterators will be simultaneously
+running at any time.
+
+Note that the items are not processed in batches, so there is no guarantee that
+ the first "limit" iterator functions will complete before any others are
+started.
+
+__Arguments__
+
+* arr - An array to iterate over.
+* limit - The maximum number of iterators to run at any time.
+* iterator(item, callback) - A function to apply to each item in the array.
+ The iterator is passed a callback(err, transformed) which must be called once
+ it has completed with an error (which can be null) and a transformed item.
+* callback(err, results) - A callback which is called after all the iterator
+ functions have finished, or an error has occurred. Results is an array of the
+ transformed items from the original array.
+
+__Example__
+
+```js
+async.mapLimit(['file1','file2','file3'], 1, fs.stat, function(err, results){
+ // results is now an array of stats for each file
+});
+```
+
+---------------------------------------
+
+
+### filter(arr, iterator, callback)
+
+__Alias:__ select
+
+Returns a new array of all the values which pass an async truth test.
+_The callback for each iterator call only accepts a single argument of true or
+false, it does not accept an error argument first!_ This is in-line with the
+way node libraries work with truth tests like fs.exists. This operation is
+performed in parallel, but the results array will be in the same order as the
+original.
+
+__Arguments__
+
+* arr - An array to iterate over.
+* iterator(item, callback) - A truth test to apply to each item in the array.
+ The iterator is passed a callback(truthValue) which must be called with a
+ boolean argument once it has completed.
+* callback(results) - A callback which is called after all the iterator
+ functions have finished.
+
+__Example__
+
+```js
+async.filter(['file1','file2','file3'], fs.exists, function(results){
+ // results now equals an array of the existing files
+});
+```
+
+---------------------------------------
+
+
+### filterSeries(arr, iterator, callback)
+
+__alias:__ selectSeries
+
+The same as filter only the iterator is applied to each item in the array in
+series. The next iterator is only called once the current one has completed
+processing. The results array will be in the same order as the original.
+
+---------------------------------------
+
+
+### reject(arr, iterator, callback)
+
+The opposite of filter. Removes values that pass an async truth test.
+
+---------------------------------------
+
+
+### rejectSeries(arr, iterator, callback)
+
+The same as reject, only the iterator is applied to each item in the array
+in series.
+
+
+---------------------------------------
+
+
+### reduce(arr, memo, iterator, callback)
+
+__aliases:__ inject, foldl
+
+Reduces a list of values into a single value using an async iterator to return
+each successive step. Memo is the initial state of the reduction. This
+function only operates in series. For performance reasons, it may make sense to
+split a call to this function into a parallel map, then use the normal
+Array.prototype.reduce on the results. This function is for situations where
+each step in the reduction needs to be async, if you can get the data before
+reducing it then it's probably a good idea to do so.
+
+__Arguments__
+
+* arr - An array to iterate over.
+* memo - The initial state of the reduction.
+* iterator(memo, item, callback) - A function applied to each item in the
+ array to produce the next step in the reduction. The iterator is passed a
+ callback(err, reduction) which accepts an optional error as its first
+ argument, and the state of the reduction as the second. If an error is
+ passed to the callback, the reduction is stopped and the main callback is
+ immediately called with the error.
+* callback(err, result) - A callback which is called after all the iterator
+ functions have finished. Result is the reduced value.
+
+__Example__
+
+```js
+async.reduce([1,2,3], 0, function(memo, item, callback){
+ // pointless async:
+ process.nextTick(function(){
+ callback(null, memo + item)
+ });
+}, function(err, result){
+ // result is now equal to the last value of memo, which is 6
+});
+```
+
+---------------------------------------
+
+
+### reduceRight(arr, memo, iterator, callback)
+
+__Alias:__ foldr
+
+Same as reduce, only operates on the items in the array in reverse order.
+
+
+---------------------------------------
+
+
+### detect(arr, iterator, callback)
+
+Returns the first value in a list that passes an async truth test. The
+iterator is applied in parallel, meaning the first iterator to return true will
+fire the detect callback with that result. That means the result might not be
+the first item in the original array (in terms of order) that passes the test.
+
+If order within the original array is important then look at detectSeries.
+
+__Arguments__
+
+* arr - An array to iterate over.
+* iterator(item, callback) - A truth test to apply to each item in the array.
+ The iterator is passed a callback(truthValue) which must be called with a
+ boolean argument once it has completed.
+* callback(result) - A callback which is called as soon as any iterator returns
+ true, or after all the iterator functions have finished. Result will be
+ the first item in the array that passes the truth test (iterator) or the
+ value undefined if none passed.
+
+__Example__
+
+```js
+async.detect(['file1','file2','file3'], fs.exists, function(result){
+ // result now equals the first file in the list that exists
+});
+```
+
+---------------------------------------
+
+
+### detectSeries(arr, iterator, callback)
+
+The same as detect, only the iterator is applied to each item in the array
+in series. This means the result is always the first in the original array (in
+terms of array order) that passes the truth test.
+
+
+---------------------------------------
+
+
+### sortBy(arr, iterator, callback)
+
+Sorts a list by the results of running each value through an async iterator.
+
+__Arguments__
+
+* arr - An array to iterate over.
+* iterator(item, callback) - A function to apply to each item in the array.
+ The iterator is passed a callback(err, sortValue) which must be called once it
+ has completed with an error (which can be null) and a value to use as the sort
+ criteria.
+* callback(err, results) - A callback which is called after all the iterator
+ functions have finished, or an error has occurred. Results is the items from
+ the original array sorted by the values returned by the iterator calls.
+
+__Example__
+
+```js
+async.sortBy(['file1','file2','file3'], function(file, callback){
+ fs.stat(file, function(err, stats){
+ callback(err, stats.mtime);
+ });
+}, function(err, results){
+ // results is now the original array of files sorted by
+ // modified date
+});
+```
+
+---------------------------------------
+
+
+### some(arr, iterator, callback)
+
+__Alias:__ any
+
+Returns true if at least one element in the array satisfies an async test.
+_The callback for each iterator call only accepts a single argument of true or
+false, it does not accept an error argument first!_ This is in-line with the
+way node libraries work with truth tests like fs.exists. Once any iterator
+call returns true, the main callback is immediately called.
+
+__Arguments__
+
+* arr - An array to iterate over.
+* iterator(item, callback) - A truth test to apply to each item in the array.
+ The iterator is passed a callback(truthValue) which must be called with a
+ boolean argument once it has completed.
+* callback(result) - A callback which is called as soon as any iterator returns
+ true, or after all the iterator functions have finished. Result will be
+ either true or false depending on the values of the async tests.
+
+__Example__
+
+```js
+async.some(['file1','file2','file3'], fs.exists, function(result){
+ // if result is true then at least one of the files exists
+});
+```
+
+---------------------------------------
+
+
+### every(arr, iterator, callback)
+
+__Alias:__ all
+
+Returns true if every element in the array satisfies an async test.
+_The callback for each iterator call only accepts a single argument of true or
+false, it does not accept an error argument first!_ This is in-line with the
+way node libraries work with truth tests like fs.exists.
+
+__Arguments__
+
+* arr - An array to iterate over.
+* iterator(item, callback) - A truth test to apply to each item in the array.
+ The iterator is passed a callback(truthValue) which must be called with a
+ boolean argument once it has completed.
+* callback(result) - A callback which is called after all the iterator
+ functions have finished. Result will be either true or false depending on
+ the values of the async tests.
+
+__Example__
+
+```js
+async.every(['file1','file2','file3'], fs.exists, function(result){
+ // if result is true then every file exists
+});
+```
+
+---------------------------------------
+
+
+### concat(arr, iterator, callback)
+
+Applies an iterator to each item in a list, concatenating the results. Returns the
+concatenated list. The iterators are called in parallel, and the results are
+concatenated as they return. There is no guarantee that the results array will
+be returned in the original order of the arguments passed to the iterator function.
+
+__Arguments__
+
+* arr - An array to iterate over
+* iterator(item, callback) - A function to apply to each item in the array.
+ The iterator is passed a callback(err, results) which must be called once it
+ has completed with an error (which can be null) and an array of results.
+* callback(err, results) - A callback which is called after all the iterator
+ functions have finished, or an error has occurred. Results is an array containing
+ the concatenated results of the iterator function.
+
+__Example__
+
+```js
+async.concat(['dir1','dir2','dir3'], fs.readdir, function(err, files){
+ // files is now a list of filenames that exist in the 3 directories
+});
+```
+
+---------------------------------------
+
+
+### concatSeries(arr, iterator, callback)
+
+Same as async.concat, but executes in series instead of parallel.
+
+
+## Control Flow
+
+
+### series(tasks, [callback])
+
+Run an array of functions in series, each one running once the previous
+function has completed. If any functions in the series pass an error to its
+callback, no more functions are run and the callback for the series is
+immediately called with the value of the error. Once the tasks have completed,
+the results are passed to the final callback as an array.
+
+It is also possible to use an object instead of an array. Each property will be
+run as a function and the results will be passed to the final callback as an object
+instead of an array. This can be a more readable way of handling results from
+async.series.
+
+
+__Arguments__
+
+* tasks - An array or object containing functions to run, each function is passed
+ a callback(err, result) it must call on completion with an error (which can
+ be null) and an optional result value.
+* callback(err, results) - An optional callback to run once all the functions
+ have completed. This function gets a results array (or object) containing all
+ the result arguments passed to the task callbacks.
+
+__Example__
+
+```js
+async.series([
+ function(callback){
+ // do some stuff ...
+ callback(null, 'one');
+ },
+ function(callback){
+ // do some more stuff ...
+ callback(null, 'two');
+ }
+],
+// optional callback
+function(err, results){
+ // results is now equal to ['one', 'two']
+});
+
+
+// an example using an object instead of an array
+async.series({
+ one: function(callback){
+ setTimeout(function(){
+ callback(null, 1);
+ }, 200);
+ },
+ two: function(callback){
+ setTimeout(function(){
+ callback(null, 2);
+ }, 100);
+ }
+},
+function(err, results) {
+ // results is now equal to: {one: 1, two: 2}
+});
+```
+
+---------------------------------------
+
+
+### parallel(tasks, [callback])
+
+Run an array of functions in parallel, without waiting until the previous
+function has completed. If any of the functions pass an error to its
+callback, the main callback is immediately called with the value of the error.
+Once the tasks have completed, the results are passed to the final callback as an
+array.
+
+It is also possible to use an object instead of an array. Each property will be
+run as a function and the results will be passed to the final callback as an object
+instead of an array. This can be a more readable way of handling results from
+async.parallel.
+
+
+__Arguments__
+
+* tasks - An array or object containing functions to run, each function is passed
+ a callback(err, result) it must call on completion with an error (which can
+ be null) and an optional result value.
+* callback(err, results) - An optional callback to run once all the functions
+ have completed. This function gets a results array (or object) containing all
+ the result arguments passed to the task callbacks.
+
+__Example__
+
+```js
+async.parallel([
+ function(callback){
+ setTimeout(function(){
+ callback(null, 'one');
+ }, 200);
+ },
+ function(callback){
+ setTimeout(function(){
+ callback(null, 'two');
+ }, 100);
+ }
+],
+// optional callback
+function(err, results){
+ // the results array will equal ['one','two'] even though
+ // the second function had a shorter timeout.
+});
+
+
+// an example using an object instead of an array
+async.parallel({
+ one: function(callback){
+ setTimeout(function(){
+ callback(null, 1);
+ }, 200);
+ },
+ two: function(callback){
+ setTimeout(function(){
+ callback(null, 2);
+ }, 100);
+ }
+},
+function(err, results) {
+ // results is now equals to: {one: 1, two: 2}
+});
+```
+
+---------------------------------------
+
+
+### parallelLimit(tasks, limit, [callback])
+
+The same as parallel only the tasks are executed in parallel with a maximum of "limit"
+tasks executing at any time.
+
+Note that the tasks are not executed in batches, so there is no guarantee that
+the first "limit" tasks will complete before any others are started.
+
+__Arguments__
+
+* tasks - An array or object containing functions to run, each function is passed
+ a callback(err, result) it must call on completion with an error (which can
+ be null) and an optional result value.
+* limit - The maximum number of tasks to run at any time.
+* callback(err, results) - An optional callback to run once all the functions
+ have completed. This function gets a results array (or object) containing all
+ the result arguments passed to the task callbacks.
+
+---------------------------------------
+
+
+### whilst(test, fn, callback)
+
+Repeatedly call fn, while test returns true. Calls the callback when stopped,
+or an error occurs.
+
+__Arguments__
+
+* test() - synchronous truth test to perform before each execution of fn.
+* fn(callback) - A function to call each time the test passes. The function is
+ passed a callback(err) which must be called once it has completed with an
+ optional error argument.
+* callback(err) - A callback which is called after the test fails and repeated
+ execution of fn has stopped.
+
+__Example__
+
+```js
+var count = 0;
+
+async.whilst(
+ function () { return count < 5; },
+ function (callback) {
+ count++;
+ setTimeout(callback, 1000);
+ },
+ function (err) {
+ // 5 seconds have passed
+ }
+);
+```
+
+---------------------------------------
+
+
+### doWhilst(fn, test, callback)
+
+The post check version of whilst. To reflect the difference in the order of operations `test` and `fn` arguments are switched. `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
+
+---------------------------------------
+
+
+### until(test, fn, callback)
+
+Repeatedly call fn, until test returns true. Calls the callback when stopped,
+or an error occurs.
+
+The inverse of async.whilst.
+
+---------------------------------------
+
+
+### doUntil(fn, test, callback)
+
+Like doWhilst except the test is inverted. Note the argument ordering differs from `until`.
+
+---------------------------------------
+
+
+### forever(fn, callback)
+
+Calls the asynchronous function 'fn' repeatedly, in series, indefinitely.
+If an error is passed to fn's callback then 'callback' is called with the
+error, otherwise it will never be called.
+
+---------------------------------------
+
+
+### waterfall(tasks, [callback])
+
+Runs an array of functions in series, each passing their results to the next in
+the array. However, if any of the functions pass an error to the callback, the
+next function is not executed and the main callback is immediately called with
+the error.
+
+__Arguments__
+
+* tasks - An array of functions to run, each function is passed a
+ callback(err, result1, result2, ...) it must call on completion. The first
+ argument is an error (which can be null) and any further arguments will be
+ passed as arguments in order to the next task.
+* callback(err, [results]) - An optional callback to run once all the functions
+ have completed. This will be passed the results of the last task's callback.
+
+
+
+__Example__
+
+```js
+async.waterfall([
+ function(callback){
+ callback(null, 'one', 'two');
+ },
+ function(arg1, arg2, callback){
+ callback(null, 'three');
+ },
+ function(arg1, callback){
+ // arg1 now equals 'three'
+ callback(null, 'done');
+ }
+], function (err, result) {
+ // result now equals 'done'
+});
+```
+
+---------------------------------------
+
+### compose(fn1, fn2...)
+
+Creates a function which is a composition of the passed asynchronous
+functions. Each function consumes the return value of the function that
+follows. Composing functions f(), g() and h() would produce the result of
+f(g(h())), only this version uses callbacks to obtain the return values.
+
+Each function is executed with the `this` binding of the composed function.
+
+__Arguments__
+
+* functions... - the asynchronous functions to compose
+
+
+__Example__
+
+```js
+function add1(n, callback) {
+ setTimeout(function () {
+ callback(null, n + 1);
+ }, 10);
+}
+
+function mul3(n, callback) {
+ setTimeout(function () {
+ callback(null, n * 3);
+ }, 10);
+}
+
+var add1mul3 = async.compose(mul3, add1);
+
+add1mul3(4, function (err, result) {
+ // result now equals 15
+});
+```
+
+---------------------------------------
+
+### applyEach(fns, args..., callback)
+
+Applies the provided arguments to each function in the array, calling the
+callback after all functions have completed. If you only provide the first
+argument then it will return a function which lets you pass in the
+arguments as if it were a single function call.
+
+__Arguments__
+
+* fns - the asynchronous functions to all call with the same arguments
+* args... - any number of separate arguments to pass to the function
+* callback - the final argument should be the callback, called when all
+ functions have completed processing
+
+
+__Example__
+
+```js
+async.applyEach([enableSearch, updateSchema], 'bucket', callback);
+
+// partial application example:
+async.each(
+ buckets,
+ async.applyEach([enableSearch, updateSchema]),
+ callback
+);
+```
+
+---------------------------------------
+
+
+### applyEachSeries(arr, iterator, callback)
+
+The same as applyEach only the functions are applied in series.
+
+---------------------------------------
+
+
+### queue(worker, concurrency)
+
+Creates a queue object with the specified concurrency. Tasks added to the
+queue will be processed in parallel (up to the concurrency limit). If all
+workers are in progress, the task is queued until one is available. Once
+a worker has completed a task, the task's callback is called.
+
+__Arguments__
+
+* worker(task, callback) - An asynchronous function for processing a queued
+ task, which must call its callback(err) argument when finished, with an
+ optional error as an argument.
+* concurrency - An integer for determining how many worker functions should be
+ run in parallel.
+
+__Queue objects__
+
+The queue object returned by this function has the following properties and
+methods:
+
+* length() - a function returning the number of items waiting to be processed.
+* concurrency - an integer for determining how many worker functions should be
+ run in parallel. This property can be changed after a queue is created to
+ alter the concurrency on-the-fly.
+* push(task, [callback]) - add a new task to the queue, the callback is called
+ once the worker has finished processing the task.
+ instead of a single task, an array of tasks can be submitted. the respective callback is used for every task in the list.
+* unshift(task, [callback]) - add a new task to the front of the queue.
+* saturated - a callback that is called when the queue length hits the concurrency and further tasks will be queued
+* empty - a callback that is called when the last item from the queue is given to a worker
+* drain - a callback that is called when the last item from the queue has returned from the worker
+
+__Example__
+
+```js
+// create a queue object with concurrency 2
+
+var q = async.queue(function (task, callback) {
+ console.log('hello ' + task.name);
+ callback();
+}, 2);
+
+
+// assign a callback
+q.drain = function() {
+ console.log('all items have been processed');
+}
+
+// add some items to the queue
+
+q.push({name: 'foo'}, function (err) {
+ console.log('finished processing foo');
+});
+q.push({name: 'bar'}, function (err) {
+ console.log('finished processing bar');
+});
+
+// add some items to the queue (batch-wise)
+
+q.push([{name: 'baz'},{name: 'bay'},{name: 'bax'}], function (err) {
+ console.log('finished processing bar');
+});
+
+// add some items to the front of the queue
+
+q.unshift({name: 'bar'}, function (err) {
+ console.log('finished processing bar');
+});
+```
+
+---------------------------------------
+
+
+### cargo(worker, [payload])
+
+Creates a cargo object with the specified payload. Tasks added to the
+cargo will be processed altogether (up to the payload limit). If the
+worker is in progress, the task is queued until it is available. Once
+the worker has completed some tasks, each callback of those tasks is called.
+
+__Arguments__
+
+* worker(tasks, callback) - An asynchronous function for processing an array of
+ queued tasks, which must call its callback(err) argument when finished, with
+ an optional error as an argument.
+* payload - An optional integer for determining how many tasks should be
+ processed per round; if omitted, the default is unlimited.
+
+__Cargo objects__
+
+The cargo object returned by this function has the following properties and
+methods:
+
+* length() - a function returning the number of items waiting to be processed.
+* payload - an integer for determining how many tasks should be
+ process per round. This property can be changed after a cargo is created to
+ alter the payload on-the-fly.
+* push(task, [callback]) - add a new task to the queue, the callback is called
+ once the worker has finished processing the task.
+ instead of a single task, an array of tasks can be submitted. the respective callback is used for every task in the list.
+* saturated - a callback that is called when the queue length hits the concurrency and further tasks will be queued
+* empty - a callback that is called when the last item from the queue is given to a worker
+* drain - a callback that is called when the last item from the queue has returned from the worker
+
+__Example__
+
+```js
+// create a cargo object with payload 2
+
+var cargo = async.cargo(function (tasks, callback) {
+ for(var i=0; i
+### auto(tasks, [callback])
+
+Determines the best order for running functions based on their requirements.
+Each function can optionally depend on other functions being completed first,
+and each function is run as soon as its requirements are satisfied. If any of
+the functions pass an error to their callback, that function will not complete
+(so any other functions depending on it will not run) and the main callback
+will be called immediately with the error. Functions also receive an object
+containing the results of functions which have completed so far.
+
+Note, all functions are called with a results object as a second argument,
+so it is unsafe to pass functions in the tasks object which cannot handle the
+extra argument. For example, this snippet of code:
+
+```js
+async.auto({
+ readData: async.apply(fs.readFile, 'data.txt', 'utf-8')
+}, callback);
+```
+
+will have the effect of calling readFile with the results object as the last
+argument, which will fail:
+
+```js
+fs.readFile('data.txt', 'utf-8', cb, {});
+```
+
+Instead, wrap the call to readFile in a function which does not forward the
+results object:
+
+```js
+async.auto({
+ readData: function(cb, results){
+ fs.readFile('data.txt', 'utf-8', cb);
+ }
+}, callback);
+```
+
+__Arguments__
+
+* tasks - An object literal containing named functions or an array of
+ requirements, with the function itself the last item in the array. The key
+ used for each function or array is used when specifying requirements. The
+ function receives two arguments: (1) a callback(err, result) which must be
+ called when finished, passing an error (which can be null) and the result of
+ the function's execution, and (2) a results object, containing the results of
+ the previously executed functions.
+* callback(err, results) - An optional callback which is called when all the
+ tasks have been completed. The callback will receive an error as an argument
+ if any tasks pass an error to their callback. Results will always be passed
+ but if an error occurred, no other tasks will be performed, and the results
+ object will only contain partial results.
+
+
+__Example__
+
+```js
+async.auto({
+ get_data: function(callback){
+ // async code to get some data
+ },
+ make_folder: function(callback){
+ // async code to create a directory to store a file in
+ // this is run at the same time as getting the data
+ },
+ write_file: ['get_data', 'make_folder', function(callback){
+ // once there is some data and the directory exists,
+ // write the data to a file in the directory
+ callback(null, filename);
+ }],
+ email_link: ['write_file', function(callback, results){
+ // once the file is written let's email a link to it...
+ // results.write_file contains the filename returned by write_file.
+ }]
+});
+```
+
+This is a fairly trivial example, but to do this using the basic parallel and
+series functions would look like this:
+
+```js
+async.parallel([
+ function(callback){
+ // async code to get some data
+ },
+ function(callback){
+ // async code to create a directory to store a file in
+ // this is run at the same time as getting the data
+ }
+],
+function(err, results){
+ async.series([
+ function(callback){
+ // once there is some data and the directory exists,
+ // write the data to a file in the directory
+ },
+ function(callback){
+ // once the file is written let's email a link to it...
+ }
+ ]);
+});
+```
+
+For a complicated series of async tasks using the auto function makes adding
+new tasks much easier and makes the code more readable.
+
+
+---------------------------------------
+
+
+### iterator(tasks)
+
+Creates an iterator function which calls the next function in the array,
+returning a continuation to call the next one after that. It's also possible to
+'peek' the next iterator by doing iterator.next().
+
+This function is used internally by the async module but can be useful when
+you want to manually control the flow of functions in series.
+
+__Arguments__
+
+* tasks - An array of functions to run.
+
+__Example__
+
+```js
+var iterator = async.iterator([
+ function(){ sys.p('one'); },
+ function(){ sys.p('two'); },
+ function(){ sys.p('three'); }
+]);
+
+node> var iterator2 = iterator();
+'one'
+node> var iterator3 = iterator2();
+'two'
+node> iterator3();
+'three'
+node> var nextfn = iterator2.next();
+node> nextfn();
+'three'
+```
+
+---------------------------------------
+
+
+### apply(function, arguments..)
+
+Creates a continuation function with some arguments already applied, a useful
+shorthand when combined with other control flow functions. Any arguments
+passed to the returned function are added to the arguments originally passed
+to apply.
+
+__Arguments__
+
+* function - The function you want to eventually apply all arguments to.
+* arguments... - Any number of arguments to automatically apply when the
+ continuation is called.
+
+__Example__
+
+```js
+// using apply
+
+async.parallel([
+ async.apply(fs.writeFile, 'testfile1', 'test1'),
+ async.apply(fs.writeFile, 'testfile2', 'test2'),
+]);
+
+
+// the same process without using apply
+
+async.parallel([
+ function(callback){
+ fs.writeFile('testfile1', 'test1', callback);
+ },
+ function(callback){
+ fs.writeFile('testfile2', 'test2', callback);
+ }
+]);
+```
+
+It's possible to pass any number of additional arguments when calling the
+continuation:
+
+```js
+node> var fn = async.apply(sys.puts, 'one');
+node> fn('two', 'three');
+one
+two
+three
+```
+
+---------------------------------------
+
+
+### nextTick(callback)
+
+Calls the callback on a later loop around the event loop. In node.js this just
+calls process.nextTick, in the browser it falls back to setImmediate(callback)
+if available, otherwise setTimeout(callback, 0), which means other higher priority
+events may precede the execution of the callback.
+
+This is used internally for browser-compatibility purposes.
+
+__Arguments__
+
+* callback - The function to call on a later loop around the event loop.
+
+__Example__
+
+```js
+var call_order = [];
+async.nextTick(function(){
+ call_order.push('two');
+ // call_order now equals ['one','two']
+});
+call_order.push('one')
+```
+
+
+### times(n, callback)
+
+Calls the callback n times and accumulates results in the same manner
+you would use with async.map.
+
+__Arguments__
+
+* n - The number of times to run the function.
+* callback - The function to call n times.
+
+__Example__
+
+```js
+// Pretend this is some complicated async factory
+var createUser = function(id, callback) {
+ callback(null, {
+ id: 'user' + id
+ })
+}
+// generate 5 users
+async.times(5, function(n, next){
+ createUser(n, function(err, user) {
+ next(err, user)
+ })
+}, function(err, users) {
+ // we should now have 5 users
+});
+```
+
+
+### timesSeries(n, callback)
+
+The same as times only the iterator is applied to each item in the array in
+series. The next iterator is only called once the current one has completed
+processing. The results array will be in the same order as the original.
+
+
+## Utils
+
+
+### memoize(fn, [hasher])
+
+Caches the results of an async function. When creating a hash to store function
+results against, the callback is omitted from the hash and an optional hash
+function can be used.
+
+The cache of results is exposed as the `memo` property of the function returned
+by `memoize`.
+
+__Arguments__
+
+* fn - the function you to proxy and cache results from.
+* hasher - an optional function for generating a custom hash for storing
+ results, it has all the arguments applied to it apart from the callback, and
+ must be synchronous.
+
+__Example__
+
+```js
+var slow_fn = function (name, callback) {
+ // do something
+ callback(null, result);
+};
+var fn = async.memoize(slow_fn);
+
+// fn can now be used as if it were slow_fn
+fn('some name', function () {
+ // callback
+});
+```
+
+
+### unmemoize(fn)
+
+Undoes a memoized function, reverting it to the original, unmemoized
+form. Comes handy in tests.
+
+__Arguments__
+
+* fn - the memoized function
+
+
+### log(function, arguments)
+
+Logs the result of an async function to the console. Only works in node.js or
+in browsers that support console.log and console.error (such as FF and Chrome).
+If multiple arguments are returned from the async function, console.log is
+called on each argument in order.
+
+__Arguments__
+
+* function - The function you want to eventually apply all arguments to.
+* arguments... - Any number of arguments to apply to the function.
+
+__Example__
+
+```js
+var hello = function(name, callback){
+ setTimeout(function(){
+ callback(null, 'hello ' + name);
+ }, 1000);
+};
+```
+```js
+node> async.log(hello, 'world');
+'hello world'
+```
+
+---------------------------------------
+
+
+### dir(function, arguments)
+
+Logs the result of an async function to the console using console.dir to
+display the properties of the resulting object. Only works in node.js or
+in browsers that support console.dir and console.error (such as FF and Chrome).
+If multiple arguments are returned from the async function, console.dir is
+called on each argument in order.
+
+__Arguments__
+
+* function - The function you want to eventually apply all arguments to.
+* arguments... - Any number of arguments to apply to the function.
+
+__Example__
+
+```js
+var hello = function(name, callback){
+ setTimeout(function(){
+ callback(null, {hello: name});
+ }, 1000);
+};
+```
+```js
+node> async.dir(hello, 'world');
+{hello: 'world'}
+```
+
+---------------------------------------
+
+
+### noConflict()
+
+Changes the value of async back to its original value, returning a reference to the
+async object.
diff --git a/node_modules/async/component.json b/node_modules/async/component.json
new file mode 100644
index 0000000..bbb0115
--- /dev/null
+++ b/node_modules/async/component.json
@@ -0,0 +1,11 @@
+{
+ "name": "async",
+ "repo": "caolan/async",
+ "description": "Higher-order functions and common patterns for asynchronous code",
+ "version": "0.1.23",
+ "keywords": [],
+ "dependencies": {},
+ "development": {},
+ "main": "lib/async.js",
+ "scripts": [ "lib/async.js" ]
+}
diff --git a/node_modules/async/lib/async.js b/node_modules/async/lib/async.js
new file mode 100644
index 0000000..1eebb15
--- /dev/null
+++ b/node_modules/async/lib/async.js
@@ -0,0 +1,958 @@
+/*global setImmediate: false, setTimeout: false, console: false */
+(function () {
+
+ var async = {};
+
+ // global on the server, window in the browser
+ var root, previous_async;
+
+ root = this;
+ if (root != null) {
+ previous_async = root.async;
+ }
+
+ async.noConflict = function () {
+ root.async = previous_async;
+ return async;
+ };
+
+ function only_once(fn) {
+ var called = false;
+ return function() {
+ if (called) throw new Error("Callback was already called.");
+ called = true;
+ fn.apply(root, arguments);
+ }
+ }
+
+ //// cross-browser compatiblity functions ////
+
+ var _each = function (arr, iterator) {
+ if (arr.forEach) {
+ return arr.forEach(iterator);
+ }
+ for (var i = 0; i < arr.length; i += 1) {
+ iterator(arr[i], i, arr);
+ }
+ };
+
+ var _map = function (arr, iterator) {
+ if (arr.map) {
+ return arr.map(iterator);
+ }
+ var results = [];
+ _each(arr, function (x, i, a) {
+ results.push(iterator(x, i, a));
+ });
+ return results;
+ };
+
+ var _reduce = function (arr, iterator, memo) {
+ if (arr.reduce) {
+ return arr.reduce(iterator, memo);
+ }
+ _each(arr, function (x, i, a) {
+ memo = iterator(memo, x, i, a);
+ });
+ return memo;
+ };
+
+ var _keys = function (obj) {
+ if (Object.keys) {
+ return Object.keys(obj);
+ }
+ var keys = [];
+ for (var k in obj) {
+ if (obj.hasOwnProperty(k)) {
+ keys.push(k);
+ }
+ }
+ return keys;
+ };
+
+ //// exported async module functions ////
+
+ //// nextTick implementation with browser-compatible fallback ////
+ if (typeof process === 'undefined' || !(process.nextTick)) {
+ if (typeof setImmediate === 'function') {
+ async.nextTick = function (fn) {
+ // not a direct alias for IE10 compatibility
+ setImmediate(fn);
+ };
+ async.setImmediate = async.nextTick;
+ }
+ else {
+ async.nextTick = function (fn) {
+ setTimeout(fn, 0);
+ };
+ async.setImmediate = async.nextTick;
+ }
+ }
+ else {
+ async.nextTick = process.nextTick;
+ if (typeof setImmediate !== 'undefined') {
+ async.setImmediate = function (fn) {
+ // not a direct alias for IE10 compatibility
+ setImmediate(fn);
+ };
+ }
+ else {
+ async.setImmediate = async.nextTick;
+ }
+ }
+
+ async.each = function (arr, iterator, callback) {
+ callback = callback || function () {};
+ if (!arr.length) {
+ return callback();
+ }
+ var completed = 0;
+ _each(arr, function (x) {
+ iterator(x, only_once(function (err) {
+ if (err) {
+ callback(err);
+ callback = function () {};
+ }
+ else {
+ completed += 1;
+ if (completed >= arr.length) {
+ callback(null);
+ }
+ }
+ }));
+ });
+ };
+ async.forEach = async.each;
+
+ async.eachSeries = function (arr, iterator, callback) {
+ callback = callback || function () {};
+ if (!arr.length) {
+ return callback();
+ }
+ var completed = 0;
+ var iterate = function () {
+ iterator(arr[completed], function (err) {
+ if (err) {
+ callback(err);
+ callback = function () {};
+ }
+ else {
+ completed += 1;
+ if (completed >= arr.length) {
+ callback(null);
+ }
+ else {
+ iterate();
+ }
+ }
+ });
+ };
+ iterate();
+ };
+ async.forEachSeries = async.eachSeries;
+
+ async.eachLimit = function (arr, limit, iterator, callback) {
+ var fn = _eachLimit(limit);
+ fn.apply(null, [arr, iterator, callback]);
+ };
+ async.forEachLimit = async.eachLimit;
+
+ var _eachLimit = function (limit) {
+
+ return function (arr, iterator, callback) {
+ callback = callback || function () {};
+ if (!arr.length || limit <= 0) {
+ return callback();
+ }
+ var completed = 0;
+ var started = 0;
+ var running = 0;
+
+ (function replenish () {
+ if (completed >= arr.length) {
+ return callback();
+ }
+
+ while (running < limit && started < arr.length) {
+ started += 1;
+ running += 1;
+ iterator(arr[started - 1], function (err) {
+ if (err) {
+ callback(err);
+ callback = function () {};
+ }
+ else {
+ completed += 1;
+ running -= 1;
+ if (completed >= arr.length) {
+ callback();
+ }
+ else {
+ replenish();
+ }
+ }
+ });
+ }
+ })();
+ };
+ };
+
+
+ var doParallel = function (fn) {
+ return function () {
+ var args = Array.prototype.slice.call(arguments);
+ return fn.apply(null, [async.each].concat(args));
+ };
+ };
+ var doParallelLimit = function(limit, fn) {
+ return function () {
+ var args = Array.prototype.slice.call(arguments);
+ return fn.apply(null, [_eachLimit(limit)].concat(args));
+ };
+ };
+ var doSeries = function (fn) {
+ return function () {
+ var args = Array.prototype.slice.call(arguments);
+ return fn.apply(null, [async.eachSeries].concat(args));
+ };
+ };
+
+
+ var _asyncMap = function (eachfn, arr, iterator, callback) {
+ var results = [];
+ arr = _map(arr, function (x, i) {
+ return {index: i, value: x};
+ });
+ eachfn(arr, function (x, callback) {
+ iterator(x.value, function (err, v) {
+ results[x.index] = v;
+ callback(err);
+ });
+ }, function (err) {
+ callback(err, results);
+ });
+ };
+ async.map = doParallel(_asyncMap);
+ async.mapSeries = doSeries(_asyncMap);
+ async.mapLimit = function (arr, limit, iterator, callback) {
+ return _mapLimit(limit)(arr, iterator, callback);
+ };
+
+ var _mapLimit = function(limit) {
+ return doParallelLimit(limit, _asyncMap);
+ };
+
+ // reduce only has a series version, as doing reduce in parallel won't
+ // work in many situations.
+ async.reduce = function (arr, memo, iterator, callback) {
+ async.eachSeries(arr, function (x, callback) {
+ iterator(memo, x, function (err, v) {
+ memo = v;
+ callback(err);
+ });
+ }, function (err) {
+ callback(err, memo);
+ });
+ };
+ // inject alias
+ async.inject = async.reduce;
+ // foldl alias
+ async.foldl = async.reduce;
+
+ async.reduceRight = function (arr, memo, iterator, callback) {
+ var reversed = _map(arr, function (x) {
+ return x;
+ }).reverse();
+ async.reduce(reversed, memo, iterator, callback);
+ };
+ // foldr alias
+ async.foldr = async.reduceRight;
+
+ var _filter = function (eachfn, arr, iterator, callback) {
+ var results = [];
+ arr = _map(arr, function (x, i) {
+ return {index: i, value: x};
+ });
+ eachfn(arr, function (x, callback) {
+ iterator(x.value, function (v) {
+ if (v) {
+ results.push(x);
+ }
+ callback();
+ });
+ }, function (err) {
+ callback(_map(results.sort(function (a, b) {
+ return a.index - b.index;
+ }), function (x) {
+ return x.value;
+ }));
+ });
+ };
+ async.filter = doParallel(_filter);
+ async.filterSeries = doSeries(_filter);
+ // select alias
+ async.select = async.filter;
+ async.selectSeries = async.filterSeries;
+
+ var _reject = function (eachfn, arr, iterator, callback) {
+ var results = [];
+ arr = _map(arr, function (x, i) {
+ return {index: i, value: x};
+ });
+ eachfn(arr, function (x, callback) {
+ iterator(x.value, function (v) {
+ if (!v) {
+ results.push(x);
+ }
+ callback();
+ });
+ }, function (err) {
+ callback(_map(results.sort(function (a, b) {
+ return a.index - b.index;
+ }), function (x) {
+ return x.value;
+ }));
+ });
+ };
+ async.reject = doParallel(_reject);
+ async.rejectSeries = doSeries(_reject);
+
+ var _detect = function (eachfn, arr, iterator, main_callback) {
+ eachfn(arr, function (x, callback) {
+ iterator(x, function (result) {
+ if (result) {
+ main_callback(x);
+ main_callback = function () {};
+ }
+ else {
+ callback();
+ }
+ });
+ }, function (err) {
+ main_callback();
+ });
+ };
+ async.detect = doParallel(_detect);
+ async.detectSeries = doSeries(_detect);
+
+ async.some = function (arr, iterator, main_callback) {
+ async.each(arr, function (x, callback) {
+ iterator(x, function (v) {
+ if (v) {
+ main_callback(true);
+ main_callback = function () {};
+ }
+ callback();
+ });
+ }, function (err) {
+ main_callback(false);
+ });
+ };
+ // any alias
+ async.any = async.some;
+
+ async.every = function (arr, iterator, main_callback) {
+ async.each(arr, function (x, callback) {
+ iterator(x, function (v) {
+ if (!v) {
+ main_callback(false);
+ main_callback = function () {};
+ }
+ callback();
+ });
+ }, function (err) {
+ main_callback(true);
+ });
+ };
+ // all alias
+ async.all = async.every;
+
+ async.sortBy = function (arr, iterator, callback) {
+ async.map(arr, function (x, callback) {
+ iterator(x, function (err, criteria) {
+ if (err) {
+ callback(err);
+ }
+ else {
+ callback(null, {value: x, criteria: criteria});
+ }
+ });
+ }, function (err, results) {
+ if (err) {
+ return callback(err);
+ }
+ else {
+ var fn = function (left, right) {
+ var a = left.criteria, b = right.criteria;
+ return a < b ? -1 : a > b ? 1 : 0;
+ };
+ callback(null, _map(results.sort(fn), function (x) {
+ return x.value;
+ }));
+ }
+ });
+ };
+
+ async.auto = function (tasks, callback) {
+ callback = callback || function () {};
+ var keys = _keys(tasks);
+ if (!keys.length) {
+ return callback(null);
+ }
+
+ var results = {};
+
+ var listeners = [];
+ var addListener = function (fn) {
+ listeners.unshift(fn);
+ };
+ var removeListener = function (fn) {
+ for (var i = 0; i < listeners.length; i += 1) {
+ if (listeners[i] === fn) {
+ listeners.splice(i, 1);
+ return;
+ }
+ }
+ };
+ var taskComplete = function () {
+ _each(listeners.slice(0), function (fn) {
+ fn();
+ });
+ };
+
+ addListener(function () {
+ if (_keys(results).length === keys.length) {
+ callback(null, results);
+ callback = function () {};
+ }
+ });
+
+ _each(keys, function (k) {
+ var task = (tasks[k] instanceof Function) ? [tasks[k]]: tasks[k];
+ var taskCallback = function (err) {
+ var args = Array.prototype.slice.call(arguments, 1);
+ if (args.length <= 1) {
+ args = args[0];
+ }
+ if (err) {
+ var safeResults = {};
+ _each(_keys(results), function(rkey) {
+ safeResults[rkey] = results[rkey];
+ });
+ safeResults[k] = args;
+ callback(err, safeResults);
+ // stop subsequent errors hitting callback multiple times
+ callback = function () {};
+ }
+ else {
+ results[k] = args;
+ async.setImmediate(taskComplete);
+ }
+ };
+ var requires = task.slice(0, Math.abs(task.length - 1)) || [];
+ var ready = function () {
+ return _reduce(requires, function (a, x) {
+ return (a && results.hasOwnProperty(x));
+ }, true) && !results.hasOwnProperty(k);
+ };
+ if (ready()) {
+ task[task.length - 1](taskCallback, results);
+ }
+ else {
+ var listener = function () {
+ if (ready()) {
+ removeListener(listener);
+ task[task.length - 1](taskCallback, results);
+ }
+ };
+ addListener(listener);
+ }
+ });
+ };
+
+ async.waterfall = function (tasks, callback) {
+ callback = callback || function () {};
+ if (tasks.constructor !== Array) {
+ var err = new Error('First argument to waterfall must be an array of functions');
+ return callback(err);
+ }
+ if (!tasks.length) {
+ return callback();
+ }
+ var wrapIterator = function (iterator) {
+ return function (err) {
+ if (err) {
+ callback.apply(null, arguments);
+ callback = function () {};
+ }
+ else {
+ var args = Array.prototype.slice.call(arguments, 1);
+ var next = iterator.next();
+ if (next) {
+ args.push(wrapIterator(next));
+ }
+ else {
+ args.push(callback);
+ }
+ async.setImmediate(function () {
+ iterator.apply(null, args);
+ });
+ }
+ };
+ };
+ wrapIterator(async.iterator(tasks))();
+ };
+
+ var _parallel = function(eachfn, tasks, callback) {
+ callback = callback || function () {};
+ if (tasks.constructor === Array) {
+ eachfn.map(tasks, function (fn, callback) {
+ if (fn) {
+ fn(function (err) {
+ var args = Array.prototype.slice.call(arguments, 1);
+ if (args.length <= 1) {
+ args = args[0];
+ }
+ callback.call(null, err, args);
+ });
+ }
+ }, callback);
+ }
+ else {
+ var results = {};
+ eachfn.each(_keys(tasks), function (k, callback) {
+ tasks[k](function (err) {
+ var args = Array.prototype.slice.call(arguments, 1);
+ if (args.length <= 1) {
+ args = args[0];
+ }
+ results[k] = args;
+ callback(err);
+ });
+ }, function (err) {
+ callback(err, results);
+ });
+ }
+ };
+
+ async.parallel = function (tasks, callback) {
+ _parallel({ map: async.map, each: async.each }, tasks, callback);
+ };
+
+ async.parallelLimit = function(tasks, limit, callback) {
+ _parallel({ map: _mapLimit(limit), each: _eachLimit(limit) }, tasks, callback);
+ };
+
+ async.series = function (tasks, callback) {
+ callback = callback || function () {};
+ if (tasks.constructor === Array) {
+ async.mapSeries(tasks, function (fn, callback) {
+ if (fn) {
+ fn(function (err) {
+ var args = Array.prototype.slice.call(arguments, 1);
+ if (args.length <= 1) {
+ args = args[0];
+ }
+ callback.call(null, err, args);
+ });
+ }
+ }, callback);
+ }
+ else {
+ var results = {};
+ async.eachSeries(_keys(tasks), function (k, callback) {
+ tasks[k](function (err) {
+ var args = Array.prototype.slice.call(arguments, 1);
+ if (args.length <= 1) {
+ args = args[0];
+ }
+ results[k] = args;
+ callback(err);
+ });
+ }, function (err) {
+ callback(err, results);
+ });
+ }
+ };
+
+ async.iterator = function (tasks) {
+ var makeCallback = function (index) {
+ var fn = function () {
+ if (tasks.length) {
+ tasks[index].apply(null, arguments);
+ }
+ return fn.next();
+ };
+ fn.next = function () {
+ return (index < tasks.length - 1) ? makeCallback(index + 1): null;
+ };
+ return fn;
+ };
+ return makeCallback(0);
+ };
+
+ async.apply = function (fn) {
+ var args = Array.prototype.slice.call(arguments, 1);
+ return function () {
+ return fn.apply(
+ null, args.concat(Array.prototype.slice.call(arguments))
+ );
+ };
+ };
+
+ var _concat = function (eachfn, arr, fn, callback) {
+ var r = [];
+ eachfn(arr, function (x, cb) {
+ fn(x, function (err, y) {
+ r = r.concat(y || []);
+ cb(err);
+ });
+ }, function (err) {
+ callback(err, r);
+ });
+ };
+ async.concat = doParallel(_concat);
+ async.concatSeries = doSeries(_concat);
+
+ async.whilst = function (test, iterator, callback) {
+ if (test()) {
+ iterator(function (err) {
+ if (err) {
+ return callback(err);
+ }
+ async.whilst(test, iterator, callback);
+ });
+ }
+ else {
+ callback();
+ }
+ };
+
+ async.doWhilst = function (iterator, test, callback) {
+ iterator(function (err) {
+ if (err) {
+ return callback(err);
+ }
+ if (test()) {
+ async.doWhilst(iterator, test, callback);
+ }
+ else {
+ callback();
+ }
+ });
+ };
+
+ async.until = function (test, iterator, callback) {
+ if (!test()) {
+ iterator(function (err) {
+ if (err) {
+ return callback(err);
+ }
+ async.until(test, iterator, callback);
+ });
+ }
+ else {
+ callback();
+ }
+ };
+
+ async.doUntil = function (iterator, test, callback) {
+ iterator(function (err) {
+ if (err) {
+ return callback(err);
+ }
+ if (!test()) {
+ async.doUntil(iterator, test, callback);
+ }
+ else {
+ callback();
+ }
+ });
+ };
+
+ async.queue = function (worker, concurrency) {
+ if (concurrency === undefined) {
+ concurrency = 1;
+ }
+ function _insert(q, data, pos, callback) {
+ if(data.constructor !== Array) {
+ data = [data];
+ }
+ _each(data, function(task) {
+ var item = {
+ data: task,
+ callback: typeof callback === 'function' ? callback : null
+ };
+
+ if (pos) {
+ q.tasks.unshift(item);
+ } else {
+ q.tasks.push(item);
+ }
+
+ if (q.saturated && q.tasks.length === concurrency) {
+ q.saturated();
+ }
+ async.setImmediate(q.process);
+ });
+ }
+
+ var workers = 0;
+ var q = {
+ tasks: [],
+ concurrency: concurrency,
+ saturated: null,
+ empty: null,
+ drain: null,
+ push: function (data, callback) {
+ _insert(q, data, false, callback);
+ },
+ unshift: function (data, callback) {
+ _insert(q, data, true, callback);
+ },
+ process: function () {
+ if (workers < q.concurrency && q.tasks.length) {
+ var task = q.tasks.shift();
+ if (q.empty && q.tasks.length === 0) {
+ q.empty();
+ }
+ workers += 1;
+ var next = function () {
+ workers -= 1;
+ if (task.callback) {
+ task.callback.apply(task, arguments);
+ }
+ if (q.drain && q.tasks.length + workers === 0) {
+ q.drain();
+ }
+ q.process();
+ };
+ var cb = only_once(next);
+ worker(task.data, cb);
+ }
+ },
+ length: function () {
+ return q.tasks.length;
+ },
+ running: function () {
+ return workers;
+ }
+ };
+ return q;
+ };
+
+ async.cargo = function (worker, payload) {
+ var working = false,
+ tasks = [];
+
+ var cargo = {
+ tasks: tasks,
+ payload: payload,
+ saturated: null,
+ empty: null,
+ drain: null,
+ push: function (data, callback) {
+ if(data.constructor !== Array) {
+ data = [data];
+ }
+ _each(data, function(task) {
+ tasks.push({
+ data: task,
+ callback: typeof callback === 'function' ? callback : null
+ });
+ if (cargo.saturated && tasks.length === payload) {
+ cargo.saturated();
+ }
+ });
+ async.setImmediate(cargo.process);
+ },
+ process: function process() {
+ if (working) return;
+ if (tasks.length === 0) {
+ if(cargo.drain) cargo.drain();
+ return;
+ }
+
+ var ts = typeof payload === 'number'
+ ? tasks.splice(0, payload)
+ : tasks.splice(0);
+
+ var ds = _map(ts, function (task) {
+ return task.data;
+ });
+
+ if(cargo.empty) cargo.empty();
+ working = true;
+ worker(ds, function () {
+ working = false;
+
+ var args = arguments;
+ _each(ts, function (data) {
+ if (data.callback) {
+ data.callback.apply(null, args);
+ }
+ });
+
+ process();
+ });
+ },
+ length: function () {
+ return tasks.length;
+ },
+ running: function () {
+ return working;
+ }
+ };
+ return cargo;
+ };
+
+ var _console_fn = function (name) {
+ return function (fn) {
+ var args = Array.prototype.slice.call(arguments, 1);
+ fn.apply(null, args.concat([function (err) {
+ var args = Array.prototype.slice.call(arguments, 1);
+ if (typeof console !== 'undefined') {
+ if (err) {
+ if (console.error) {
+ console.error(err);
+ }
+ }
+ else if (console[name]) {
+ _each(args, function (x) {
+ console[name](x);
+ });
+ }
+ }
+ }]));
+ };
+ };
+ async.log = _console_fn('log');
+ async.dir = _console_fn('dir');
+ /*async.info = _console_fn('info');
+ async.warn = _console_fn('warn');
+ async.error = _console_fn('error');*/
+
+ async.memoize = function (fn, hasher) {
+ var memo = {};
+ var queues = {};
+ hasher = hasher || function (x) {
+ return x;
+ };
+ var memoized = function () {
+ var args = Array.prototype.slice.call(arguments);
+ var callback = args.pop();
+ var key = hasher.apply(null, args);
+ if (key in memo) {
+ callback.apply(null, memo[key]);
+ }
+ else if (key in queues) {
+ queues[key].push(callback);
+ }
+ else {
+ queues[key] = [callback];
+ fn.apply(null, args.concat([function () {
+ memo[key] = arguments;
+ var q = queues[key];
+ delete queues[key];
+ for (var i = 0, l = q.length; i < l; i++) {
+ q[i].apply(null, arguments);
+ }
+ }]));
+ }
+ };
+ memoized.memo = memo;
+ memoized.unmemoized = fn;
+ return memoized;
+ };
+
+ async.unmemoize = function (fn) {
+ return function () {
+ return (fn.unmemoized || fn).apply(null, arguments);
+ };
+ };
+
+ async.times = function (count, iterator, callback) {
+ var counter = [];
+ for (var i = 0; i < count; i++) {
+ counter.push(i);
+ }
+ return async.map(counter, iterator, callback);
+ };
+
+ async.timesSeries = function (count, iterator, callback) {
+ var counter = [];
+ for (var i = 0; i < count; i++) {
+ counter.push(i);
+ }
+ return async.mapSeries(counter, iterator, callback);
+ };
+
+ async.compose = function (/* functions... */) {
+ var fns = Array.prototype.reverse.call(arguments);
+ return function () {
+ var that = this;
+ var args = Array.prototype.slice.call(arguments);
+ var callback = args.pop();
+ async.reduce(fns, args, function (newargs, fn, cb) {
+ fn.apply(that, newargs.concat([function () {
+ var err = arguments[0];
+ var nextargs = Array.prototype.slice.call(arguments, 1);
+ cb(err, nextargs);
+ }]))
+ },
+ function (err, results) {
+ callback.apply(that, [err].concat(results));
+ });
+ };
+ };
+
+ var _applyEach = function (eachfn, fns /*args...*/) {
+ var go = function () {
+ var that = this;
+ var args = Array.prototype.slice.call(arguments);
+ var callback = args.pop();
+ return eachfn(fns, function (fn, cb) {
+ fn.apply(that, args.concat([cb]));
+ },
+ callback);
+ };
+ if (arguments.length > 2) {
+ var args = Array.prototype.slice.call(arguments, 2);
+ return go.apply(this, args);
+ }
+ else {
+ return go;
+ }
+ };
+ async.applyEach = doParallel(_applyEach);
+ async.applyEachSeries = doSeries(_applyEach);
+
+ async.forever = function (fn, callback) {
+ function next(err) {
+ if (err) {
+ if (callback) {
+ return callback(err);
+ }
+ throw err;
+ }
+ fn(next);
+ }
+ next();
+ };
+
+ // AMD / RequireJS
+ if (typeof define !== 'undefined' && define.amd) {
+ define([], function () {
+ return async;
+ });
+ }
+ // Node.js
+ else if (typeof module !== 'undefined' && module.exports) {
+ module.exports = async;
+ }
+ // included directly via
+