Allow to select config format in new project menu

[cderv]

This add a selector menu for choosing config format

closes #606

[apreshill]

Yes! Thank you 👍

[cderv]

I get one approval, I'll merge ! 😄

@yihui you can tweak later if needed.

[yihui]

That's great! I'll probably tweak the order of all these options later. Thanks!

[cderv]

I tried several layout of them and decided it was interesting to have this option just above the one regarding YAML metadata so that you don't confuse the two.

However the SelectInput creates a space below that makes it a bit weird.

happy tweaking !

[yihui]

How does this version look to you?

[cderv]

It is better without the select input. Nice idea to have also allow TRUE / FALSE in new_site() !

[apreshill]

If I saw this, I'm not sure I'd know what to do. Could we make it more clear what the alternative is? (i.e., if all I know is YAML, sure this sounds great!) Maybe the reword could be "convert config file to YAML (if config.toml file is found, comments are removed)"?

[yihui]

convert config file to YAML

Good suggestion! Will do in a second.

(if config.toml file is found, comments are removed)

That might be too much in the UI. If there were a way to show a help icon, I'd be totally happy to add these words to the help text. In addition, when #560 is solved, we won't need to emphasize that comments will be lost in the conversion.

[apreshill]

That makes sense- thanks!