Define switch for key=value

Question

In nim, you can define a symbol via -d:value and test if it was defined with defined(value). It is possible however to define a key and retrieve its value? I'm looking for something in the vein of --colors:on but user defined.

Answer 1

I also looked for this and didn't find anything for my nim-small-coreutils. I ended up using environment variables as a hack and read them in a nonportable manner:

const colors = staticExec "echo \"$colors\""

when colors == "on":
  echo "It's on!"
else:
  echo "I guess it's off? The value is: ", colors

This takes the environment variable at compile time, so you can use it like this:

colors=on nim c example

or alternatively:

nim c --putEnv:colors=on c example