Prerequisites: Jake requires Node.js. (http://nodejs.org/)
Get Jake:
git clone git://github.com/mde/jake.git
Build Jake:
cd jake && make && sudo make install
Installing with npm
npm install jake
Or, get the code, and npm link in the code root.
jake [options ...] [env variables ...] target
Jake is a simple JavaScript build program with capabilities similar to the regular make or rake command.
Jake has the following features:
* Jakefiles are in standard JavaScript syntax
* Tasks with prerequisites
* Namespaces for tasks
* Async task execution
-V
--version Display the program version.
-h
--help Display help information.
-f *FILE*
--jakefile *FILE* Use FILE as the Jakefile.
-C *DIRECTORY*
--directory *DIRECTORY* Change to DIRECTORY before running tasks.
-T
--tasks Display the tasks, with descriptions, then exit.
A Jakefile is just executable JavaScript. You can include whatever JavaScript you want in it.
Use task to define tasks. Call it with two arguments (and one optional argument):
task(name/prerequisites, action, [async]);
The name/prerequisites argument can be either a simple String with the name of the task, or an Object literal where the single key is the name of the ask, and the value is an array of prerequisites. The action is a function defininng the action to take for the task.
The async argument is optional, and when set to true (async === true) indicates the task executes asynchronously. Asynchronous tasks need to call complete() to signal they have completed.
Tasks created with task are always executed when asked for (or are a prerequisite). Tasks created with file are only executed if no file with the given name exists or if any of its file-prerequisites are more recent than the file named by the task. Also, if any prerequisite is a regular task, the file task will always be executed.
Use desc to add a string description of the task.
Here's an example:
desc('This is the default task.');
task('default', function (params) {
console.log('This is the default task.');
});
desc('This task has prerequisites.');
task({'hasPrereqs': ['foo', 'bar', 'baz']}, function (params) {
console.log('Ran some prereqs first.');
});
And here's an example of an asynchronous task:
desc('This is an asynchronous task.');
task('asyncTask', function () {
setTimeout(complete, 1000);
}, true);
Create a file-task by calling file.
File-tasks create a file from one or more other files. With a file-task, Jake checks both that the file exists, and also that it is not older than the files specified by any prerequisite tasks. File-tasks are particularly useful for compiling something from a tree of source files.
desc('This builds a minified JS file for production.');
file({'foo-minified.js': ['bar', 'foo-bar.js', 'foo-baz.js']}, function () {
// Code to concat and minify goes here
});
Create a directory-task by calling directory.
Directory-tasks create a directory for use with for file-tasks. Jake checks for the existence of the directory, and only creates it if needed.
desc('This creates the bar directory for use with the foo-minified.js file-task.');
directory('bar');
Use namespace to create a namespace of tasks to perform. Call it with two arguments:
namespace(name, namespaceTasks);
Where is name is the name of the namespace, and namespaceTasks is a function with calls inside it to task or desc definining all the tasks for that namespace.
Here's an example:
desc('This is the default task.');
task('default', function () {
console.log('This is the default task.');
});
namespace('foo', function () {
desc('This the foo:bar task');
task('bar', function () {
console.log('doing foo:bar task');
});
desc('This the foo:baz task');
task({'baz': ['default', 'foo:bar']}, function () {
console.log('doing foo:baz task');
});
});
In this example, the foo:baz task depends on the the default and foo:bar tasks.
Parameters can be passed to Jake two ways: plain arguments, and environment variables.
To pass positional arguments to the Jake tasks, enclose them in square braces, separated by commas, after the name of the task on the command-line. For example, with the following Jakefile:
desc('This is an awesome task.');
task('awesome', function (a, b, c) {
console.log(a, b, c);
});
You could run jake like this:
jake awesome[foo,bar,baz]
And you'd get the following output:
foo bar baz
Note that you cannot uses spaces between the commas separating the parameters.
Any parameters passed after the Jake task that contain an equals sign (=) will be added to process.env.
With the following Jakefile:
desc('This is an awesome task.');
task('awesome', function (a, b, c) {
console.log(a, b, c);
console.log(process.env.qux, process.env.frang);
});
You could run jake like this:
jake awesome[foo,bar,baz] qux=zoobie frang=asdf
And you'd get the following output:
foo bar baz
zoobie asdf
Running jake with no arguments runs the default task.
Jake supports the ability to run a task from within another task via the invoke and execute methods.
The invoke method will run the desired task, along with its prerequisites:
desc('Calls the foo:bar task and its prerequisites.');
task('invokeFooBar', function () {
// Calls foo:bar and its prereqs
jake.Task['foo:bar'].invoke();
});
It will only run the task once, even if you call invoke repeatedly.
desc('Calls the foo:bar task and its prerequisites.');
task('invokeFooBar', function () {
// Calls foo:bar and its prereqs
jake.Task['foo:bar'].invoke();
// Does nothing
jake.Task['foo:bar'].invoke();
});
The execute method will run the desired task without its prerequisites:
desc('Calls the foo:bar task without its prerequisites.');
task('executeFooBar', function () {
// Calls foo:bar without its prereqs
jake.Task['foo:baz'].execute();
});
Calling execute repeatedly will run the desired task repeatedly.
desc('Calls the foo:bar task without its prerequisites.');
task('executeFooBar', function () {
// Calls foo:bar without its prereqs
jake.Task['foo:baz'].execute();
// Can keep running this over and over
jake.Task['foo:baz'].execute();
jake.Task['foo:baz'].execute();
});
If you want to run the task and its prerequisites more than once, you can use invoke with the re-enable method.
desc('Calls the foo:bar task and its prerequisites.');
task('invokeFooBar', function () {
// Calls foo:bar and its prereqs
jake.Task['foo:bar'].invoke();
// Does nothing
jake.Task['foo:bar'].invoke();
// Only re-runs foo:bar, but not its prerequisites
jake.Task['foo:bar'].re-enable();
jake.Task['foo:bar'].invoke();
});
The re-enable method takes a single Boolean arg, a 'deep' flag, which reenables the task's prerequisites if set to true.
desc('Calls the foo:bar task and its prerequisites.');
task('invokeFooBar', function () {
// Calls foo:bar and its prereqs
jake.Task['foo:bar'].invoke();
// Does nothing
jake.Task['foo:bar'].invoke();
// Only re-runs foo:bar, but not its prerequisites
jake.Task['foo:bar'].re-enable(true);
jake.Task['foo:bar'].invoke();
});
It's easy to pass params on to a sub-task run via invoke or execute:
desc('Passes params on to other tasks.');
task('passParams', function () {
var t = jake.Task['foo:bar'];
// Calls foo:bar, passing along current args
t.invoke.apply(t, arguments);
});
You can abort a task by calling the fail function, and Jake will abort the currently running task. You can pass a customized error message to fail:
desc('This task fails.');
task('failTask', function () {
fail('Yikes. Something back happened.');
});
You can also pass an optional exit status-code to the fail command, like so:
desc('This task fails with an exit-status of 42.');
task('failTaskQuestionCustomStatus', function () {
fail('What is the answer?', 42);
});
The process will exit with a status of 42.
Uncaught errors will also abort the currently running task.
Passing jake the -T or --tasks flag will display the full list of tasks available in a Jakefile, along with their descriptions:
$ jake -T
jake default # This is the default task.
jake asdf # This is the asdf task.
jake concat.txt # File task, concating two files together
jake failure # Failing task.
jake lookup # Jake task lookup by name.
jake foo:bar # This the foo:bar task
jake foo:fonebone # This the foo:fonebone task
Setting a value for -T/--tasks will filter the list by that value:
$ jake -T foo
jake foo:bar # This the foo:bar task
jake foo:fonebone # This the foo:fonebone task
The list displayed will be all tasks whose namespace/name contain the filter-string.
Jake's PackageTask programmically creates a set of tasks for packaging up your project for distribution. Here's an example:
var PackageTask = require('package_task').PackageTask
, t = new PackageTask('fonebone', 'v0.1.2112', function () {
var fileList = [
'Jakefile'
, 'README.md'
, 'package.json'
, 'lib/*'
, 'bin/*'
, 'tests/*'
];
this.packageFiles.include(fileList);
this.needTarGz = true;
this.needTarBz2 = true;
});
This will automatically create a 'package' task that will assemble the specified files in 'pkg/fonebone-v0.1.2112,' and compress them according to the specified options. After running jake package, you'll have the following in pkg/:
fonebone-v0.1.2112
fonebone-v0.1.2112.tar.bz2
fonebone-v0.1.2112.tar.gz
PackageTask also creates a 'clobberPackage' task that removes the pkg/ directory, and a 'repackage' task that forces the package to be rebuilt.
PackageTask requires NodeJS's glob module (https://github.com/isaacs/node-glob). It is used in FileList, which is used to specify the list of files to include in your PackageTask (the packageFiles property). (See FileList, below.)
Jake's FileList takes a list of glob-patterns and file-names, and lazy-creates a list of files to include. Instead of immediately searching the filesystem to find the files, a FileList holds the pattern until it is actually used.
When any of the normal JavaScript Array methods (or the toArray method) are called on the FileList, the pending patterns are resolved into an actual list of file-names. FileList uses NodeJS's glob module (https://github.com/isaacs/node-glob).
To build the list of files, use FileList's include and exclude methods:
var FileList = require('file_list').FileList
, list = new FileList();
list.include('foo/*.txt');
list.include(['bar/*.txt', 'README.md']);
list.include('Makefile', 'package.json');
list.exclude('foo/zoobie.txt');
list.exclude(/foo\/src.*.txt/);
console.log(list.toArray());
The include method can be called either with an array of items, or multiple single parameters. Items can be either glob-patterns, or individual file-names.
The exclude method will prevent files from being included in the list. These files must resolve to actual files on the filesystem. It can be called either with an array of items, or mutliple single parameters. Items can be glob-patterns, individual file-names, string-representations of regular-expressions, or regular-expression literals.
Jake can also handle Jakefiles in CoffeeScript. Be sure to make it Jakefile.coffee so Jake knows it's in CoffeeScript.
Here's an example:
sys = require('sys')
desc 'This is the default task.'
task 'default', (params) ->
console.log 'Ths is the default task.'
console.log(sys.inspect(arguments))
invoke 'new', []
task 'new', ->
console.log 'ello from new'
invoke 'foo:next', ['param']
namespace 'foo', ->
task 'next', (param) ->
console.log 'ello from next with param: ' + param
James Coglan's "Jake": http://github.com/jcoglan/jake
Confusingly, this is a Ruby tool for building JavaScript packages from source code.
280 North's Jake: http://github.com/280north/jake
This is also a JavaScript port of Rake, which runs on the Narwhal platform.
Matthew Eernisse, mde@fleegix.org
Mark Wubben / EqualMedia mark.wubben@equalmedia.com Patrick Walton pcwalton@mimiga.net Andrzej Sliwa andrzej.sliwa@i-tool.eu Nikolay V. Nemshilov aka St nemshilov@gmail.com Sascha Teske sascha.teske@gmail.com