How do I do this?

[Andrei Alexandrescu via Digitalmars-d]

On 08/03/2017 07:00 AM, Shachar Shemesh wrote:
> No sooner did I send out this question I have found the D feature I've 
> been looking for. This is what I have:
> 
> module log;
> 
> version(alternate_logger) {
> mixin("public import " ~ import("alternate_logger.txt") ~ ";");
> } else {
> 
> // Default implementation goes here
> 
> }
> 
> Can't say I'm thrilled with this, but it does get the job done. 
> Suggestions more than welcome.

There's a bit of irony you can read a file during compilation but not 
pass a string.

The version can be dropped as well, but always requires the existence of 
the intermediate file:

private alternateLogger = import("alternate_logger.txt");
static if (alternateLogger.length) {
     mixin("public import " ~ alternateLogger ~ ";");
} else {
     ...
}


Andrei