Import by

[c0ntribut0r]

Consider I have these modules which define the same functions (only 
implementation differs): 
    
    
    -math_precise.nim
    -math_optimal.nim
    -math_fast.nim
    

Now I want to include them based on compile-time option.

I know I can use
    
    
    const math {.strdefine.}: string = "precise"  # default value
    when math == "precise":  # <-- here I hardcode possible values
      import math_precise
    elif math == "fast":
      import math_fast
    

And then 
    
    
    nim c -d:math:fast
    

1) What if I don't want to hardcode modules names and just import by name? Like 
    
    
    const math {.strdefine.}: string = "precise"  # default value
    import "math_" & math  # <-- Error: invalid module name :( I guess I should 
play with macros?
    

2) Also, is there any way to import module by absolute location? 
    
    
    import /tmp/math_superfast
    

3) Will things work if I use "include" instead of "import"? (I know the 
difference between them)