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authorDaniel Narvaez <dwnarvaez@gmail.com>2013-02-01 10:15:14 (GMT)
committer Daniel Narvaez <dwnarvaez@gmail.com>2013-02-01 10:15:14 (GMT)
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+### Premise
+XXX Improve the Sugar OS developer experience
+XXX Cross platform sugar activities -> future
+XXX What is Sugar.
+# Modules
+The framework is composed of various libraries, initially
+* activity
+* graphics
+* datastore
+* collaboration
+## Interface description
+Each module provides one or more interface descriptions which are language
+independent. A subset of object-oriented languages should be chosen, so that
+it's possible to implement these from all the languages we are interested
+to support. The description uses the Java syntax because unlike, for example,
+python and JavaScript it's explicit about types.
+For example, the datastore interface could look like
+class Datastore {
+ DatastoreObject load()
+ void save(DatastoreObject object);
+XXX The interface is totally made up!
+## Implementation
+The implementation should be written as much as possible using web languages.
+But of course we will have the necessity to interact with native system
+components. The multi language nature of the interfaces will be useful here
+because it will allow to provide system specific implementation of certain
+interfaces and generically bridge to them from JavaScript. All the modules
+should provide a web fallback, which will allow to run the activity everywhere
+even if with degraded functionality.
+## Code style
+View source is a core part of the sugar experience, so any kind of code
+obfuscation should be avoided. This includes languages that compiles to
+JavaScript, like CoffeeScript.
+## Namespacing and package management
+We are using [volo](http://volojs.org) for namespacing and package management,
+both in the libraries and in the documentation.
+# Activities
+Activities are [open web apps](https://developer.mozilla.org/en-US/docs/Apps),
+their only specificity is that can make use of our libraries framework. On some
+platforms (Sugar OS for example) it might be necessary to generate boilerplate
+code, configuration or to package the app in a certain way to have it integrate
+with the system flawlessly. We will provide scripts to fully automate those
+# Random Sugar OS implementation notes
+* We should probably use firefox, as provided by upstream, to run activities.
+Chrome would probably be an equally good alternative. At some point we could
+just support both.
+* We should be able to customize it to look like a native activity without
+patching the code. We need to avoid showing any chrome UI (toolbar, menubar,
+etc) and to provide the X properties Sugar expects from an activity.
+* We can generate activity.info from the webapp manifest when building a .xo.
+* The svg icon might be provided in a native/sugar-os directory of the web
+activity or something.
+* Communication between JavaScript and native code will be handled by a firefox
+extension and it will most likely go through DBus. pythonext might be an
+alternative but I'm not convinced we should get into pyxpcom again. We can use
+dom events to communicate between content and extension.
+* Icons should be shipped as part of the graphics library, we can write a
+script to sync them with the sugar-artwork repository.
+* The datastore interface should probably make use of HTML files support. I
+hope using local paths will work in a web activity.
+* To get full permission I suspect a web app needs to be installed. We will
+have to figure out if/how we can avoid that.
+Version 0.1
+* Write an helloworld open web activity. Or maybe just steal a cool one? Might
+make for a more shiny demo without any effort :)
+* Write a firefox activity using firefox as packaged in the distro. Will
+probably require an extension to disable the chrome UI cleanly.
+* Write the web activity -> sugar activity script, probably as a volo command.
+volo build sugar-os, or something.
+* Play with volo to see if there are any road blockers.
+* Write the activity library, with a close method. It should be enough to call
+window.close() on Sugar OS at least.
+* Document how to use volo to pull in the library.
+* Write the datastore library. This will involve writing an extension which
+will use DBus to communicate with the datastore and making sure we can
+communicate between content and extension.
+* Write the graphics library with initial toolbar implementation. It will
+require writing the script to sync the svg icons from sugar-artwork.