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7194 :: Writing a string into a source file compile time

• mronetwo (orginal) [2020-12-03T14:29:45+01:00] view original

  Hello,

  I'd like to build a binary with a staticRead but I'd like to modify the path of the file to be read compile time.

  I have my config.nims

  task build_that_binary, "...":
    let sourceFile = paramStr(paramCount() -1 )
    let firmwareFile = paramStr(paramCount())
    # Somehow insert the firmwareFile into THE_FILENAME spot.
    selfExec("c " & sourceFile)
  Run

  And my source file:

  const firmwareFile = staticRead(THE_FILENAME)
  Run

  I'd like to control THE_FILENAME from the compiling command.

  
  nim build_that_binary main.nim firmware.elf
  Run

  How should I go about it? Should I at all? ;)

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• doofenstein (orginal) [2020-12-03T14:51:24+01:00] view original

  you can use a strdefine:

  const FirmwarePath {.strdefine.} = "defaultPath.elf"
  const FirmwareData = staticRead FirmwarePath
  Run

  then compile with nim c -d:FirmwarePath=abc.elf file.nim

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• pietroppeter (orginal) [2020-12-03T14:55:46+01:00] view original

  you can use compile-time define pragmas

  something like:

  const
    myFilename {.strdefine.} = "firmware.elf"  # default value
    firmwareFile = staticRead(myFilename)
  Run

  called with nim c -d:myFilename=firmwareAlt.elf main.nim

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• mronetwo (orginal) [2020-12-03T15:07:02+01:00] view original

  and @pietroppeter exactly what I needed. Thank you so much.

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