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Cross Desktop Application Scripting I D E a S F O R a N I M P L E M E N T a T I O N

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Cross Desktop Application Scripting I D E a S F O R a N I M P L E M E N T a T I O N Cross desktop Application Scripting I d e a s f o r a n i m p l e m e n t a t i o n D e s k t o p D e v e l o p e r C o n f e r e n c e 2 0 0 6 , O t t a w a , C a n a d a T u e s d a y J u l y 1 8 t h 2 0 0 6 H u b e r t F i g u i è r e < h u b @ f i g u i e r e . n e t> This presentation is released under the Creative Commons Attribution-ShareAlike Canada license. http://creativecommons.org/licenses/by-sa/2.5/ca/ A p p l i c a t i o n S c r i p t i n g ● High level application control. – It is telling an application to do some task the application is designed for. – Fetch data from the runing application ● It is not meant for writing complete apps like Python or Perl are used. ● Think of a high-level IPC S c r i p t i n g S y s t e m ● A language (any) ● A high-level “protocol”: Scripting Model – Preferably with an Object Oriented paradigm ● An IPC mechanism ● Applications S c r i p t i n g S y s t e m ( 2 ) W h a t a l r e a d y e x i s t s ? ● Kross http://kross.dipe.org/readme.html – KOffice scripting in Python and Ruby ● Kommander http://kommander.kdewebdev.org/ – Use UI build with QtDesigner and DCOP ● Gnome + ATK + ORBit + Python http://www.jamesh.id.au/talks/lca2004/ – control UI through the ATK W h a t a l r e a d y e x i s t s ( 2 ) ● Dogtail http://people.redhat.com/zcerza/dogtail/ – UI testing tool. Use ATK and other a11y technologies ● StepTalk http://www.gnustep.org/experience/StepTalk.html – Scripting for GNUStep – Use Objective-C introspection – Language independente W h a t a l r e a d y e x i s t s ( 3 ) ● All these applications with scripting capabilities – Gimp – Mozilla – etc. W h a t c a n u s e i t ? ● Atomato – Automation tool for GNOME – Typically benefiting from a universal way to remote control applications – Inspired from Apple Automator: http://www.apple.com/macosx/features/automator/ ● All these applications with scripting capabilities W h a t f o r ? ● Automating tasks ● Fetching data from an application – Current song being played in Music Player – Exporting data ● Integrating applications together I n s p i r a t i o n ● AppleScript – Provides all the feature wished – But specific to MacOS X G o a l s ● Maximum interoperability – KDE – Gnome – Mozilla – OOo ● Standardization of commands ● Language independence ● Security G o a l s ( 2 ) I P C ● D-Bus – Adopted by Gnome – Adopted by KDE for KDE4 – Structured IPC with access control ● DCOP – In KDE3. Will be replaced by D-Bus in KDE4 ● Other? L a n g u a g e ● Pick the language of your choice – Write an adapter to the Scripting Model ● Language by default (suggestion) – JavaScript ● Because lot of end use know it (web designer, etc) ● Easy to learn ● Light implementation – Nobody want to script in Scheme or Lisp (or at least nobody sane) A p p l i c a t i o n s ● Server: the application controled – Glue to the scripting model ● Client: controling another application – Call the scripting model APIs S c r i p t i n g M o d e l ● An object oriented model – You fetch objects ● word ● canvas ● email – You manipulates objects ● delete word ● create email – etc. – More natural S c r i p t i n g M o d e l ( 2 ) ● Translate the applications data model (functionnality) – delete word 1 of paragraph 3 of document of front window – draw rectangle with (5, 10, 100, 100) in canvas of front window ● Does not translate the user interface – at least not as a first choice S c r i p t i n g M o d e l ( 3 ) ● Standardized – Having to rewrite the script because we changed application would suck – Manipulating data should be done the same way in all “similar” applications ● Word processors ● Drawing programs ● Web browsers ● e-mail programs ● etc. S t a n d a r d i z a t i o n ● Task done the same way whatever the application is – Writing a text is writing a text be it in KWord or AbiWord – Creating a table in a spreadsheet is the same be it Gnumeric or KSpread – etc. ● Described in a “registry” “ R e g i s t r y ” ● Contain and complete description of the model ● Maintained as an open specification ● Updated periodically for additions ● The goal: interoperability ● The scripting “bible” K n o w i n g w h a t a n a p p . s u p p o r t s ? ● How do we know what an application support – Querying its interface ● What does the application provide? – A list of object and commands it understands C h a l l e n g e s ● In order to be able to have the scripting model adopted: – Write it without Qt (licensing incompatible with Gnome policy) – Provide plain C API (Gnome and its gazillion of language bindings) and C++ (KDE) ● Make it easy to use on the server side – providing scripting should be easy or nobody will do it ● Secure S e c u r i t y ● Very hard to achieve – Things shouldn't happen without user approval ● Sending mail – The “I Love You” fiasco in 2000 and later on Windows ● Worm and virus propagation – Why antivirus and anti-spyware editors do love Microsoft – But things should work ● I have no answer right now Q u e s t i o n s .
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