Is it possible to flush output from a Shelter?

[christianp]

I use Shelter.captureR calls to evaluate code. It seems that the output is a list of all completed lines in the process's output. If I output some text that doesn't end in a newline, for example cat("hey"), it's not included in the output.

I couldn't see a method to flush the output, or an option for captureR. Is there one?

[georgestagg]

I couldn't see a method to flush the output, or an option for captureR. Is there one?

There is not, sorry. See the discussions at #375 and emscripten-core/emscripten#2770 (comment) for more details.

I think right now the best you can do is append something like cat(fill=TRUE) to the end of any R code you want to evaluate. However, I don't particularly like solutions like that because they add an additional empty output line if the preceding code already printed a final newline.

If there is truly no better alternative with Emscripten, and you think it would be useful, we could possibly add an option to captureR to print the final newline at the C level and then strip the extra empty line from the results array if it appears.

[christianp]

An option to print a newline and strip it if the last line is empty would solve this for me, I think.

[georgestagg]

Thinking about this some more, #375 was about the console experience rather than capturing output.

The fact that the final output line is not captured at all when using captureR should probably be considered a bug. So, I've tagged this as such and will try to get some kind of solution in place for the next version.

[christianp]

Thanks, George!

[georgestagg]

No worries, I'll tag a release soon so that you can pin to v0.3.3.