It is actually possible if you don't mind using undocumented behavior of
getImpl (the docs say it works only for procedures and constants, but that
doesn't seem to be true):
# a.nim
type Mock* = object
# b.nim
import macros, strutils
import a as al
type
# Just to prove that module and symbol aliases are transparent.
MockAlias = al.Mock
proc XYZ(sym: NimNode): string =
let
ts = sym.getType[1]
fn = ts.symbol.getImpl.lineInfoObj.filename
result = "`$1 <http://nim-lang.org/docs/$2.html#$1>`_".format(
ts.symbol, fn.substr(0, fn.find('.') - 1)
)
macro add2docs(docs, sym: typed): typed =
newCommentStmtNode(docs.strVal.format(XYZ(sym)))
proc initMock*(m: var MockAlias) =
"$1 constructor".add2docs(MockAlias)
echo "initializing.."
