Is it possible to set the console font and font size, as I would with "Edit->GUI preferences", programmatically? What would a function for this look like? I am on windows.
On Windows (at least), the $R_HOME/etc/Rconsole config file sets many optional parameters for the console and pager. Here's the section that you could hand-edit to change the default font and font size:
## Font.
# Please use only fixed width font.
# If font=FixedFont the system fixed font is used; in this case
# points and style are ignored. If font begins with "TT ", only
# True Type fonts are searched for.
font = TT Courier New
points = 10
style = normal # Style can be normal, bold, italic
To change the values from the command line of an active R session, you could use the loadRconsole() function. It reads in a text file containing directives of the form shown above, which will overwrite the values read from Rconsole when R was launched. Here's an example:
temp <- tempfile()
cat("points = 13\n", file = temp)
cat("style = italic\n", file = temp, append = TRUE)
loadRconsole(file = temp)
## And then, to reset to the defaults:
loadRconsole(file = file.path(R.home(), "etc/Rconsole"))