[HTMLExporter] Initialize resources before widget filtering #2118
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`WidgetsDataTypeFilter` is responsible for outputting appropriate widgets code where needed. If `resources` is passed to it, it looks inside for `path` and `name` parameters to figure out where to find metadata. The default `name` is `"Notebook"`, set in [`Exporter._init_resources`](https://github.com/jupyter/nbconvert/blob/fec19fa4d538495c3c02b85708878287463412ae/nbconvert/exporters/exporter.py#L314). However, in `HTMLExporter`, `resources` is passed to `WidgetsDataTypeFilter` [here](https://github.com/jupyter/nbconvert/blob/fec19fa4d538495c3c02b85708878287463412ae/nbconvert/exporters/html.py#L260), *before* `Exporter.init_resources` is called (indirectly [here](https://github.com/jupyter/nbconvert/blob/fec19fa4d538495c3c02b85708878287463412ae/nbconvert/exporters/html.py#L266)). This works ok as long as the default behavior for setting `name` is not needed - so all commandline conversions work. But when used programmatically (like [here](https://github.com/yuvipanda/notebooksharing.space/blob/f37fda886b8e565a82b1bf3f4851ad89e2b00e47/nbss/app.py#L250), for notebooksharing.space), this causes widgets to not be rendered, as the `text/plain` mime type is chosen each time. This PR explicicly calls `_init_resources` before instantiating `WidgetsDataTypeFilter`, so the defaulting behavior of `_init_resources` is exercised.
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yuvipanda
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Mar 1, 2024
Temporary workaround until jupyter/nbconvert#2118 gets merged. This was a fun one to track down.
blink1073
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Mar 1, 2024
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Thanks for the quick review and merge, @blink1073 |
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WidgetsDataTypeFilteris responsible for outputting appropriate widgets code where needed. Ifresourcesis passed to it, it looks inside forpathandnameparameters to figure out where to find metadata. The defaultnameis"Notebook", set inExporter._init_resources. However, inHTMLExporter,resourcesis passed toWidgetsDataTypeFilterhere, beforeExporter.init_resourcesis called (indirectly here).This works ok as long as the default behavior for setting
nameis not needed - so all commandline conversions work. But when used programmatically (like here, for notebooksharing.space), this causes widgets to not be rendered, as thetext/plainmime type is chosen each time.This PR explicicly calls
_init_resourcesbefore instantiatingWidgetsDataTypeFilter, so the defaulting behavior of_init_resourcesis exercised.