[Sugar-devel] View Source

Tomeu Vizoso tomeu
Wed Nov 26 06:07:15 EST 2008

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On Tue, Nov 25, 2008 at 5:16 PM, Bert Freudenberg <bert at freudenbergs.de> wrote:
> On 22.11.2008, at 16:35, Simon Schampijer wrote:
>> Some great work has been going into this release regarding the 'View
>> source' support. The source of all the activities can be shown, and
>> browse does still support showing the source of the document.
>> === sugar-toolkit ===
>> * Add view-source-related methods HandleViewSource and GetDocumentPath
>> === sugar ===
>> * Implement a global handler for the view source key
> Since I could not find any discussion, let alone documentation about
> this, I (again) got out my rusty Emacs, fed it with some grep'ed
> source files, and reverse-engineered the whole thing. My findings are
> here:

Sorry, announcing this properly is something that has been in my TODO
for a while, but hadn't managed to get to it yet.

> http://wiki.laptop.org/go/Low-level_Activity_API#D-Bus_Methods

All looks good to me.

> I like the idea so far, but here are the issues I have with the
> current implementation:
> 1. HandleViewSource should return a boolean to indicate whether the
> request was handled or not.
>    This would also get rid of the Python-specific dbus error handling
> code in viewsource.py because handle_view_source in activity.py could
> simply answer False.

Hmm, but we still need to handle the case where a non-python activity
hasn't implemented the method, right?

> 2. GetDocumentPath is a poor name for what it does.
>    It should contain "source" because it's not the document that is
> viewed, but its source. How about GetSourcePath()?

Well, the idea is that, by default, sugar will show the activity's
source. This method is intended for displaying a textual
representation of the sources behind a document, be it html for
browse, logo for turtleart, etc. So perhaps getDocumentSourcePath()?

>    Also, this file is deleted unconditionally when the source view is
> closed. I'd add a boolean "transfer_ownership" flag to indicate that
> it's okay to delete (similar to the datastore API).

Sounds good, if activity authors think this added complexity is ok, I
can add it.

>    Also, what kinds of source does this support? I noticed the
> Browser's HTML source was highlighted. Is that determined by the file
> name extension?

The sugar shell tries its best to display a formatted view of the
source code based on the extension and the contents of the file.
Currently, it uses gtksourceview2 for that. If an activity author
would like an improved or new formatter, we should talk to the
upstream maintainers to add it. It's quite configurable and should be
a matter of editing some xml files.

> On a more general note, activityservice.py should be annotated with
> the actual DBus signatures.

True, added it to my TODO at http://sugarlabs.org/go/User:Tomeu



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