Re: Nim macro help

[Hlaaftana]

In `createSlide`, you have 2 arguments with type varargs[string], because you 
put a comma after `title`. Also `body.sons` is not defined.


import macros

proc createSlide(title: string, body: varargs[string]): NimNode =
  result = newEmptyNode()
  echo "createSlide", title, body

proc slideDslImpl(head, body: NimNode): NimNode =
  if body.kind == nnkIdent:
var args: seq[string]
for n in body:
  if n.kind == nnkStrLit:
args.add n.strVal
result = createSlide(body.strVal, args)

macro slide*(head, body: untyped): untyped =
  result = slideDslImpl(head, body)
  echo result.treeRepr # let us inspect the result


Run

Documentation of the macros module: 
[https://nim-lang.org/docs/macros.html](https://nim-lang.org/docs/macros.html)

Re: Nim macro help

[juancarlospaco]

`import macros`

Nim macro help

[kidandcat]

Hi, I'm very noob with macros, I'm trying to learn, but I'm getting this error:

undeclared field: 'kind' for type system.NimNode


proc createSlide(title, body: varargs[string]) =
  echo "createSlide", title, body

proc slideDslImpl(head, body: NimNode): NimNode =
  if body.kind == nnkIdent:
var args: seq[string]
for n in body.sons:
  if n.kind == nnkStrLit:
args.add n.strVal
result = createSlide(body.strVal, args)

macro slide*(head, body: untyped): untyped =
  result = slideDslImpl(head, body)
  echo result.treeRepr # let us inspect the result


Run