nimforum mirror - Macro and file-handling for os=any

sei (orginal) [2026-06-05T17:29:25+02:00] view original

Hi!

I'm writing a GUI-library for embedded and made a Macro to load images from files into arrays. This works fine until I want to compile it for the microcontroller (pico2 using picosdk4nim), then it complains: Error: undeclared identifier: 'walkDir'

I guess this makes sense since it is compiled with os=any in config.nims. Is this guess correct? And is there a way I can get this to work?

Thanks, Simon

sei (orginal) [2026-06-05T20:14:19+02:00] view original

I gave up on the Macro and made a workaround by using a nim programm to generate a nim source file with all arrays hardcoded, just like in the XBM Format, this is probably the better approach anyway :)

Leopotam (orginal) [2026-06-06T01:33:28+02:00] view original

I used template for folder embedding, not macros:


import std/os

template embedFolder*(folder: static string): untyped =
  const fulldir = instantiationInfo(-1, true).filename.parentDir / folder
  const tmp = static:
    var files: seq[string]
    for relpath in walkDirRec(fulldir, relative = true):
      files.add(relpath.replace("\\", "/"))
      files.add(staticRead(fulldir / relpath))
    files
  tmp

# seq[string] of pairs: file-name + file-data
const platformsData = embedFolder("../data/platforms")

usage:


# platforms.
removeDir("znak_platforms")
var i = 0
while i < platformsData.len:
  let file = platformsData[i]
  createDir("znak_platforms" / file.parentDir)
  writeFile("znak_platforms" / file, platformsData[i + 1])
  i += 2

sei (orginal) [2026-06-06T09:30:22+02:00] view original

Thanks for your template! Always nice to see how other people use the metaprogramming. Unfortunately the template hast the same problem as my macro: walkDirRec is not available when compiling with os=any ...

Araq (orginal) [2026-06-06T10:37:41+02:00] view original

Make a patch to allow for it. Or use Nimony and its plugin system which doesn't suffer from these design problems. Or port Nimony's plugin system over to Nim 2...

sei (orginal) [2026-06-07T08:27:51+02:00] view original

Funny that someone else made a similar thread, leaving it here for reference: {.compile.} for submodules and pathing for os=any

I'm quite happy with the workaround actually, but even the workaround could be integrated in a Macro/Plugin, so I guess I will get back to this at some time.

@Araq: At some point I want to learn Nimony anyway, would you consider it ready for something close to production?

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13963 :: Macro and file-handling for os=any