The pyjamas project is using gitolite to manage the git repositories. For read-only access, use the following:
git clone git://pyjs.org/git/pyjamas.git
If you would like write-access, please simply ask on the mailing list. For developers, use the following (which only works once you have sent in an ssh public key):
git clone gitolite@pyjs.org:pyjamas
There is also a public git browser (a pyjamas app!) at:
http://pyjs.org/pygit
In the Pyjamas repository is a file DEVELOPER.RULES. As long as you follow those rules, you can do what you like. The trickiest part about Pyjamas is remembering that it is several separate projects. For example: modifying the javascript compiler has absolutely nothing to do with Pyjamas Desktop. But, modifying a Pyjamas UI Widget requires testing on eight platforms (five web and three desktop) including compiling and testing using both --strict and -O on the five web platforms, and testing under nearly ten web browsers (Firefox 2 to 4; Opera 9 to 10.5; Safari 3 and 4; Google Chrome; IE 6 and above, and so on). Clearly, this is an impossible task but you should make the best efforts and use your judgement, and ask for help on the mailing list.
Lastly - please use the bugtracker to report bugs (regardless of how trivial or small); the mailing list to coordinate discussions; the pyjamas wiki to create HOWTOs and so on.
Web application development can be tricky: it can come as a bit of a shock when compared to python app development to learn that web browsers do not come with any proper debugging assistance whatsoever, by default. You will need to install and/or enable a debugger in the browsers that you use:
You should also note that the Pyjamas compiler has a "-d" option which will enable a python-like stack trace when a javascript exception occurs. The amount of javascript generated can be FIVE times larger, so only enable this during development.
Lastly, it is worth reiterating that Pyjamas Desktop runs as pure python: you should give serious consideration to running the application under Pyjamas Desktop alongside developing it for the browser. The availability of python runtime stack traces and the simple fact that the standard python interpreter is much better at catching certain kinds of errors than (brain-damaged) browsers has generally found to make life much much easier.
To become familiar with the user interface side of Pyjamas, you might like to refer to the examples online and also compile and run them locally.
You might find the ui module class
hierarchy useful. The ui
module contains all of the
main classes you need to create your user interface. At first, this
module can be a quite confusing because of the number of classes
defined. However, there is API documentation,
along with a tutorial
on how to create your own interactive widget.
You might also have a look at the GWT Documentation for widgets that have ported to pyjamas.
The pyjs repo contains both shared libraries (usable in python or javascript mode), and "runners" that execute the code (python or javascript) on a particular engine. Here is a quick what-is-what.
Key points to remember: