A short blog post about this package: Faster rendering in RStudio.

This package provides a single RStudio addin command called Render in console. Executing it will call rmarkdown::render(active_document_path, envir=.GlobalEnv) in the RStudio console and then launch a viewer for the resulting rendered document.

The effect is very similar to the Code | Run region | Run all command, except that it also renders your output document. Unlike the Knit button, however, it does not create a fresh environment. This has some important consequences to keep in mind.

First, packages loaded by your RMarkdown document will not need to be reloaded if they are already loaded in the console environment. This was my primary motivation for building the addin. My RMarkdown documents often depend on a set of Bioconductor packages, and these can take many seconds to load. If I'm making minor changes to a document and need to constantly render it to check the output, not having to reload packages each time is much faster.

Second, because rendering occurs in the console's environment, it is easy to introduce mistakes that you won't catch until you render in an empty environment via the Knit command. For example, if you load a package in your console environment but forget to load it in your RMarkdown document, the package will be available when you render via the console but not when you use the Knit command. I find that it is a good idea to periodically use the Knit command to make sure my RMarkdown document does not have any dependencies on the state of the console environment.

By default, RStudioConsoleRender will call rstudioapi::viewer() on the rendered document. This will typically open a browser window. You can control this behavior by setting the RStudioConsoleRender.viewer_mode option to one of three values:

• browser: This is the default option and simply calls rstudioapi::viewer().
• viewer_pane: This will open the rendered document in the RStudio Viewer pane by first copying it to the RStudio session temporary directory (a requirement of the Viewer pane).
• none: No action will be performed after rendering the document when the option is set to this value.

Set the option using options() like this:

options("RStudioConsoleRender.viewer_mode"="viewer_pane")

Install the package via devtools::install_github("jeffjjohnston/RStudioConsoleRender"). The Render in console command should then appear in RStudio's Tools | Addins drop-down menu. You can assign the command a keyboard shortcut using Tools | Modify Keyboard Shortcuts....