Compile one Sass file
A sass engine for compiling a single file.
Haml refactored this logic in 2.3, this is backwards compatibility for either one
Place the syntax error into the target css file, formatted to display in the browser (in development mode) if there‘s an error.
Determines if the configuration file is newer than any css file
Returns the sass file that needs to be compiled, if any.
We don‘t want to show the full exception in production environments.
[Validate]