Cannot configure colors per-destination

[rmolinari]

In my application I send log messages to a file. Messages are optionally sent to stderr based on a command line argument.

Compile-time config:
chronicles_sinks=textlines[file(dancing_links.log),dynamic]

Runtime:

if verbose:
  defaultChroniclesStream.outputs[1].writer =
    proc (logLevel: LogLevel, msg: LogOutputStr) {.gcsafe.} =
      stderr.write(msg)
else:
  defaultChroniclesStream.outputs[1].writer =
    proc (logLevel: LogLevel, msg: LogOutputStr) {.gcsafe.} =
      discard

This works. But I would like to see colors in the log file but not in stderr, because I sometimes want to pipe that into grep, sed, etc. But the nocolors property can't be specified on a per-destination basis.

This doesn't work:
chronicles_sinks=textlines[file(dancing_links.log),dynamic(nocolors)]

This does work, but now neither destination gets colors.
chronicles_sinks=textlines[nocolors,file(dancing_links.log),dynamic]

Is there a way to specify this at compile time, or to strip out the colors in the dynamic writer?