Sorry for haven't checked this earlier, but after using the 1.5.0 version I noticed that the render API might need one more simplification.

Background: I have a boolean variable that controls whether the output should be flat or indented.

Creating a String is as simple as this:

String text = minify ? html.render() : html.renderFormatted();

However, I want to render the HTML into a file without creating a String, and unless I missed something the new API requires doing this:

html.render(minify ? FlatHtml.into(out) : IndentedHtml.into(out));

and if there's also a Config instance involved, it's even more verbose:

Config config = ...
html.render(minify ? FlatHtml.into(out, config) : IndentedHtml.into(out, config));

I wonder if we could introduce some kind of factory that would allow writing this:

html.render(minify ? flatHtml() : indentedHtml(), out, config);

The simplest version I can think of could be something like:

BiFunction<Appendable, Config, HtmlBuilder> flatHtml() {
   return (out, config) -> FlatHtml.into(out, config);
}

and

void render(BiFunction<Appendable, Config, HtmlBuilder> factory, Appendable appendable, Config config) {
   render(factory.apply(appendable, config));
}

but that's probably not very user/developer friendly, as this BiFunction doesn't not provide any help what value to pass here. Perhaps an explicit HtmlBuilderFactory would be clearer.

What do you think, @sembler ?