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Viewing changes to ivle/webapp/base/xhtml.py

Add support for custom error views. Plugins can now declare that errors
occuring in a view class or its subclasses should be passed into another view.

We start with an XHTMLErrorView used to render errors in XHTMLViews.

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Lines of Context:
ivle/webapp/base/xhtml.py
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                for mplugin in overlay.plugin_styles:
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                    for path in overlay.plugin_styles[mplugin]:
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                        req.styles.append(media_url(req, mplugin, path))
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                req.scripts_init += overlay.plugin_scripts_init
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                overlays.append(overlay.render(req))
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        return overlays
 
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class XHTMLErrorView(XHTMLView):
 
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    template = 'xhtmlerror.html'
 
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    def __init__(self, req, exception):
 
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        self.context = exception
 
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    def populate(self, req, ctx):
 
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        ctx['exception'] = self.context