jsrepl

A REPL for R that works in a browser, communicating with R using Javascript via the Rserve package.

Bugs / missing features

The console.input enable flag works for readLines(), debug(), etc., but not readline().
Output without newlines are not actually sent immediately, unless flush.console() is called explicitly (not sure if even this works in Linux).

for (i in 1:5) { 
    Sys.sleep(0.5)
    cat("=")
    ## flush.console()
}

Progress bars created using txtProgressBar() work
Not surprisingly, terminal escape sequences don't work. To get output that contains escape sequences (without the desirable effect), try setting options(cli.ansi = TRUE, cli.num_colors" = 256), and then try to print a tibble. One way to deal with this could be to recognize escape codes and start tags, and hope we will always get matching closing tags. Another, probably better, option is to use a HTML terminal emulator like https://xtermjs.org/
run.Rserve() currently starts a new session for every new connection, e.g., if we reload the web page. It would be nice to have the option of having a common / single session that all clients will connect to.
HTML help does not work out of the box. Can be made to work by setting suitable port options, and making sure the R httpd server does not start on its own.
Default pager is not useful (unless we handle stdout OOB messages specially); probably could just set options(pager) to write to file / show / unlink.