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10165 :: string fmt doesn't work inside of template?

• alexeypetrushin (orginal) [2023-05-04T12:48:10+02:00] view original

  Why fmt doesn't work in template?

  import std/strformat
  
  template button*(size = "w-5 h-5") =
    echo fmt"{size}"
  
  template layout*() =
    button()
  
  layout()
  Run

  Error

  
  play.nim(11, 7) template/generic instantiation of `layout` from here
  play.nim(6, 11) template/generic instantiation of `fmt` from here
  std/macros(549, 1) Error: undeclared identifier: 'size'
  Run

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• gabbhack (orginal) [2023-05-04T13:16:02+02:00] view original

  I think this is because after instantiating the button template, you have echo fmt"{size}" line. Use procedure instead or declare the size variable explicitly

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• Symb0lica (orginal) [2023-05-04T13:23:27+02:00] view original

  This is a documented limitation of the strformat module. See https://nim-lang.github.io/Nim/strformat.html#limitations for workaround

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