Feature Request: Stream knitr progress to function for processing

[nathanwebb]

I would like to convert the knitr progress messages into a progress bar, which I think that means that I need to parse the output and extract just the percentages. Another possibility would be to include a hook that can be called whenever the progress is updated.

Is there a way to capture the progress of knitr and process it in a function in realtime? The function would then parse each segment of text and extract the percentage.

AFAIK the output is being sent to stdout, so there is a way that the output can be capture, either using sink() or captureOutput() to a connection. Can that connection then be sent to a function to be processed in realtime?

SO post at http://stackoverflow.com/q/40699822/559676

[bguiastr]

This would also be a great addition for the withProgress() function in shiny apps used to generate reports with knitr.

[cderv]

Related to #1880

[yihui]

I guess this is possible now with the dev version of knitr: https://github.com/yihui/knitr/blob/master/NEWS.md#changes-in-knitr-version-142

[github-actions]

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