Automatic progress bar should only display when in interactive and not knitting

[jimhester]

The automatic progress bar for do currently outputs regardless of interactive use or if you are using knitr. Ideally the progress bar should check for both of these conditions.

I believe you can use interactive() to check for an interactive session and knitr sets the global option knitr.in.progress when it is running, or you can probably use the new knitr print functions, although I haven't written anything using them yet. If I get some spare time I can submit a pull request for this, let me know which way you would prefer to handle knitr.

[kforner]

agree. and additional args to explicitly inhibit it, or set the min_time...

[jaengelberg]

I agree that it would be nice to either turn off the automatic progress bar or allow the setting of min_time in do.

Using sink and cat for output to a file is disrupted by the automatic progress bar, leaving writeLines as a workaround.