Slim: pretty and ugly

Question

In the article, which explains difference in performance perspective of rails template engines I find slim pretty and slim ugly terms. Can you explain difference between this?

Answer 1

Seems like Slim uses Temple for template compilation. Temple provides the set_default_options method to Slim::Engine, documented and explained here.

The corresponding Temple code that does the 'pretty' transformations (tab indentations and reordered attributes) to the compiled HTML appears to be here: https://github.com/judofyr/temple/blob/master/lib/temple/html/pretty.rb

I presume ugly just refers to having the pretty option set to false. The article you referenced is comparing performance, so the relevance of the pretty option to performance appears to be that the extra processing increases the overhead when generating HTML.

Answer 2

Its just the way the resulting html is rendered:

• pretty: indentations are clean and easy to follow, useful for development mode
• ugly: everything is dumped without tabs, shorter (but difficult to read), ideal for production